Potential Fuel Pressure Regulator Solution

[Jagdpanzer]

Looking into potential alternatives to our NLA fuel pressure regulators.
Here are some photos of tansplanting a later style Delphi regulator to the original LT5 regulator body. So far looking very promising. Next step is machining a retainer ring and drilling and threading several screw holes to hold it together. Then test it out. Will keep everyone here posted as to the results.
http://i540.photobucket.com/albums/gg333/pwasinger/EC4E71A0-4C96-4778-AB75-0C0F1710AD51_zps9qqxkhqt.jpg

http://i540.photobucket.com/albums/gg333/pwasinger/6D268B03-F739-46D0-A039-04A4189F53F9_zpsadpkvgg9.jpg

http://i540.photobucket.com/albums/gg333/pwasinger/9D85ADE8-5128-46A5-B8E0-64D1B48B9813_zpskiac03w7.jpg

[LGAFF]

:cheers: Wow

[Roadster]

I agree......WOW.....:cheers:

[LGAFF]

Is the stock one just a press fit?

[Jagdpanzer]

The stock one is an old school design with a separate diaphragm and valve disk assembly under the vacuum dome.

[LGAFF]

I think you could just zip tie it in.....lol

I have an old one someone sandblasted if you're looking for ones to test things on

[Jagdpanzer]

Sure, send it over

[-=Jeff=-]

The L98 was a bolt in top.. maybe a ring with screws to bolt in..


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[Regimof]

Literally just had this issue. Please keep us informed

[Jagdpanzer]

Retainer ring finished and regulator installed on the fuel rails. Now on to the testing phase. Wish me luck.
http://i540.photobucket.com/albums/gg333/pwasinger/Mobile%20Uploads/1DAAD533-1425-4D86-A6CE-4235C83F42CE_zpsksrzkxz0.jpg

http://i540.photobucket.com/albums/gg333/pwasinger/Mobile%20Uploads/30BCE824-7125-4BAA-88CD-454DC1B03D89_zpshgziy7cl.jpg

[A26B]

Knowing you, luck is not a process component. I have no doubt you've covered all the bases. :-)

[secondchance]

Beautiful! Looks like that piece was born on top of a LT5.
Is that my old failed regulator reborn?

[Jagdpanzer]

Yes, that is your old regulator body. Used it for a noble cause.

[QB93Z]

A thing of beauty, Phil. Well done.


Jim

[-=Jeff=-]

IF this works out.. it will be a great solution

[GOLDCYLON]

Very steam punk. I like it

[XfireZ51]

So Phil, this newer style regulator is set for same FP as the OEM one, correct?

[DRM500RUBYZR-1]

Nice work!!!
Marty

[secondchance]

A thing of beauty, Phil. Well done.


Jim

And, it's serviceable with out removing the fuel rails.

[Jagdpanzer]

Is this a Delphi FP10023 ??



And what are the Delphi Specifications regarding vacuum and FP as compared to the LT5 FP Regulator?



I wanted to up the fuel rail pressure to 50 psi for the new motor I'm building so this one is the Delphi FP10016 rated at 350kpa. I will also be testing the Delphi FP10023 you mentioned which is the same body form and rated at 300kpa (43 psi). Will also baseline the the stock regulator to see how they all compare.

[Jagdpanzer]

First round of testing was very encouraging. Before going to the trouble of pulling the plenum and swapping out the stock fuel regulator I wanted to make sure the rebuilt regulator would control fuel pressure properly and not leak so I hooked it up to a spare set of fuel rails and did some testing with it connected to the car's fuel supply and return lines:

http://i540.photobucket.com/albums/gg333/pwasinger/IMG_0805_zpsrgf5vtvt.jpg

First connected a jumper from the battery + to the fuel pump test connection to run the pumps with out the engine being started.

Tested the stock regulator with and without vacuum being applied

With vacuum 41 psi indicated
http://i540.photobucket.com/albums/gg333/pwasinger/IMG_0801_zps3ruvuuat.jpg

Without vacuum 50 psi indicated
http://i540.photobucket.com/albums/gg333/pwasinger/BCF76D60-5447-4B08-BFFA-1B9E784DF2EC_zpshnzbbkli.jpg

Rebuilt regulator with vacuum 42 psi indicated. No problem controlling the full flow of both fuel pumps.
http://i540.photobucket.com/albums/gg333/pwasinger/IMG_0807_zps5ui3qc09.jpg

Rebuilt regulator without vacuum 49 psi indicated. No problem controlling the full flow of both fuel pumps.
http://i540.photobucket.com/albums/gg333/pwasinger/IMG_0808_zpsdpetpndj.jpg

And best of all, no leaks!
http://i540.photobucket.com/albums/gg333/pwasinger/IMG_0810_zps2nt3wo1h.jpg

Now on to swapping out the stock regulator and doing some driving tests.

[RussMcB]

Very nice.

[GOLDCYLON]

Well done Phil I think it looks better than OEM

[Roadster]

As always, your work is flawless.....:cheers:

[Top Toy]

Looks similar to the one Lingenfelter used to make. Nice work!

ATTACH]6640[/ATTACH]

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[secondchance]

Phil,

If you splice in unit below, you can adjust pressure increase point.

https://www.google.com/search?q=delphi+adjustable+fuel+pressure+regulator&client=safari&sa=X&hl=en-us&biw=1024&bih=672&noj=1&tbs=vw:l,ss:44&tbm=shop&srpd=12911678169521295124&prds=num:1,of:1,epd:12911678169521295124&ved=0ahUKEwiM7Nf5gM3WAhVBwVQKHTvtBqEQgjYIyAQ

[Pete]

Looks similar to the one Lingenfelter used to make. Nice work!

ATTACH]6640[/ATTACH]

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Very nice Phil.

Sorry Phil.
But this just caught my eye.
Dennis, WOW 468RWHP is that SEA corrected and what were the corrected torque #'s.
Have you taken it to the track 468 RWHP with stock wheels should be running 126 MPH.

Pete

[Top Toy]

Those results were based on Standard corrections. Actual RWHP was higher. Was a cool, dry day which always helps! Torque was about 380, corrected. Last track day was several years and several mods ago. No match for yours!

[Dynomite]

Phil.....I have at least one Fuel Pressure Regulator that has failed and am saving that so I can use a Delphi FP10023 once you have proven the concept.

I assume your machined ring is outside the Delphi flange and if you were to sell those machined rings I could use that as a template to drill and tap threads for the Allen Head machine screws :thumbsup:

How did you remove the present Fuel Pressure Regulator Mechanism from the Aluminum Housing so as not to damage the compatibility of the Delphi to that original Fuel Pressure Regulator Housing?

Your research is superb and if this works out and you were to sell the machined rings I am in for at least 3 ;)

I will pay a premium if you tell me how deep to tap and provide the screws :D

All kidding aside (I am not kidding about the machined flanges).....Phil....this is great research and your machining capabilities are the best....

Thank you for all your contributions over the years :thumbsup: :thumbsup:

[Jagdpanzer]

Cliff,
Thank you for the compliments. Im afraid the retainer ring by itself won’t do you much good. The stock regulator body requires several machining steps to adapt the Delphi FP regulator. Once I’ve finished testing ths one I will be tweaking the machining steps a little to make it easier to reproduce which will likely impact the retainer ring design.

[5ABI VT]

This is amazing nicely done !! Been frustrated because I wanted to change mine out for the sake of knowing it was working and functioning as it should and had no option. Looking forward to the progress/end result and looking forward to sending mine over if required !!

[Dynomite]

This is amazing nicely done !! Been frustrated because I wanted to change mine out for the sake of knowing it was working and functioning as it should and had no option. Looking forward to the progress/end result and looking forward to sending mine over if required !!

Count me in also :handshak:

Cliff,
Thank you for the compliments. Im afraid the retainer ring by itself won’t do you much good. The stock regulator body requires several machining steps to adapt the Delphi FP regulator. Once I’ve finished testing ths one I will be tweaking the machining steps a little to make it easier to reproduce which will likely impact the retainer ring design.

If this works out I am assuming you are shooting for an unmodified Delphi FP Regulator and a MODIFIED Stock FP Regulator body?

[XfireZ51]

This is amazing nicely done !! Been frustrated because I wanted to change mine out for the sake of knowing it was working and functioning as it should and had no option. Looking forward to the progress/end result and looking forward to sending mine over if required !!

If ur fuel pressure checks out, then u know its working.

[-=Jeff=-]

I am interested in this as well. Moving to a modern device would be great..

[Jagdpanzer]

If this works out I am assuming you are shooting for an unmodified Delphi FP Regulator and a MODIFIED Stock FP Regulator body?

No modifications are necessary to the Delphi regulator, only to the stock base.
This particular Delphi regulator design comes in 3 pressure ratings FP10023 300 KPa (43 psi), FP10016 350 KPa (51 psi) and FP10021 400 KPa (58 psi). Note the pressure control range of FP10016 that I used in the above test was almost identical to that of the stock regulator.

[-=Jeff=-]

How is this working out? Viable replacement?


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[LGAFF]

Lets hope Phil hasn't redefined 94 Torch Red

[GOLDCYLON]

Lets home Phil hasn't redefined 94 Torch Red

Hope ? and happy b day Lee I hope it was a good one. GC

[-=Jeff=-]

Any updated status on how this is working for you?

[Jagdpanzer]

Sorry, nothing new to report. Right now focused on completing the cylinder heads for the 427 build. Weather here lately not so great which hasn’t motivated me to get on with this.

[Jagdpanzer]

With the way winter is shaping up here in Northern Virginia looks like it will be some time before I can get around to seriously road testing this fuel pressure regulator. Therefore, if anyone is interested in testing it out on their ZR-1 I will gladly provide it as no cost loaner for a reasonable period of time. Afterwards I would like it back to perform a full tear down inspection.

[GOLDCYLON]

With the way winter is shaping up here in Northern Virginia looks like it will be some time before I can get around to seriously road testing this fuel pressure regulator. Therefore, if anyone is interested in testing it out on their ZR-1 I will gladly provide it as no cost loaner for a reasonable period of time. Afterwards I would like it back to perform a full tear down inspection.

I've said this before Phil but thanks for leaning forward to promote this hobby. GC

[Blownrunner]

It amazes me just how clever and smart some people are. Wow.

[Dynomite]

With the way winter is shaping up here in Northern Virginia looks like it will be some time before I can get around to seriously road testing this fuel pressure regulator. Therefore, if anyone is interested in testing it out on their ZR-1 I will gladly provide it as no cost loaner for a reasonable period of time. Afterwards I would like it back to perform a full tear down inspection.

What is the latest? Are you still looking for someone to install your prototype?

I can pull a plenum in a few minutes and install one as you like just to see how it functions. I also have one or maybe more FPRs (at least one that has failed) I removed from a ZR-1 that was flooded with gasoline.
I will go and check that now.

I like the mechanical looks :thumbsup: :thumbsup: Very Nice Phil.
https://cimg4.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/400x400-1/80-phil_3_ed6b5bccfadfdc24e3613c51f92fd89ba11f529e.jp g

[Jagdpanzer]

Thanks Cliff, I’ll send it your way this weekend. Send me your failed one after this one proves out and I will incorporate any lessons learned


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[Jagdpanzer]

Cliff,
Let start with the one I have completed so we can gain some quick experience then go from there. Work is tying me up at the moment and don’t have much free time for the next few weeks.


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[XfireZ51]

Cliff/Phil,

Let me suggest that u should add datalogging before and after installation. This way we can judge if the FPR has had any unforseen affect on fueling.

[XfireZ51]

Cliff,

I made a suggestion. Not forcing anyone. Frankly, datalogging would represent a simpler not more complicated means of confirming results IMO. I’ve had experience with any number of “changes” that should not have affected engine operation and yet they require modifying the calibration to some extent ie changing injector brands even if they supposedly flow the same.
This is exactly what I would do were I to install one of these.

[XfireZ51]

First things first :handshak:

I am sending Phil Two FPRs in a few minutes and will provide Phil a tracking # in a message :thumbsup:

I deleted some of my posts here so as to not complicate Phil's great experiment (Phil will report on the continuation of the experiment as he has time and I will report to Phil) :cheers:

Well if there is a need for analysis, let me know. I can provide the tools.

[XfireZ51]

Phil,

U mention that the pressure range of the 016 FPR is almost identical to the stock regulator. Can u quantify the variance or was it totally negligible?

[XfireZ51]

Cliff,

Excellent. Thanks.

[GOLDCYLON]

WTG Cliff and Phil. GC

[HAWAIIZR-1]

Wow! Heroes!


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[PhillipsLT5]

You guys are amazing


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[5ABI VT]

Awesome ! Excited for this !

[conesare2seconds]

:cheers:

[Jagdpanzer]

Reports coming in from Dynomite are quite encouraging
Catch up here: https://www.corvetteforum.com/forums/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-10.html#post1596384563

[Ccmano]

Great work guys! Can’t wait to see the final product. I see the utility of using the original housing with the new Delphi regulator. Any possibility of getting an adjustable version?
H
:cheers:

[Jagdpanzer]

Would consider it, know of a good one? No noisy Chinese knock-offs.


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[Dynomite]

Reports coming in from Dynomite are quite encouraging
Catch up here: The Improved LT5 Fuel Pressure Regulator (https://www.corvetteforum.com/forums/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-15.html#post1596384563)

The Improved LT5 Fuel Pressure Regulator (https://www.corvetteforum.com/forums/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-15.html#post1596384563)

As far as adjustable version......there are at least 3 Delphi Fuel Pressure Regulators of various pressure ratings that one can change out in a matter of minutes without removing the plenum.

Phil only modified the Fuel Pressure Regulator Stock Housing making it easy to insert anyone of several inexpensive Delphi Stock Fuel Pressure Regulators :thumbsup:

Initial Fuel Pressure Tests of Improved Fuel Pressure Regulator (IFPR).

A. With Engine On at Idle (850 rpm) vacuum line connected to IFPR.
Engine idled at 850 rpm with Fuel Pressure Reading 40 psi (Left photo).
B. Engine Idled at 850 rpm with Vacuum line to IFPR disconnected
Fuel Pressure Reading is 52 psi (Right photo).

No Leaks......

https://cimg6.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/400x400-1/80-f17_1013adcea141b1775202e71c5bd89907aae4ba34.jpght tps://cimg8.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/400x400-1/80-f18_9518e8bb3d13e00eaaeada4e82eb489a602d432e.jpg
https://cimg4.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/800x600-1/80-f23_ff6ea077da29abbcaa1613fa44c393189605ba83.jpg
https://cimg1.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/800x800-1/80-img_2453_e29053d98c77cfead5ec1c4f4e4160530c272c90. jpg
https://cimg9.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/800x800-1/80-img_2452_87201789780c9749367c1607bf4a546b64a3dece. jpg

[GOLDCYLON]

Cliff is it me or does that piece look more "Stock" than stock? It just follows the form factor better like stainless oil cooler lines. It looks like that was like it was suppose to... or meant to... look like as "serviceable" vs. non serviceable. GC

[Dynomite]

Cliff is it me or does that piece look more "Stock" than stock? It just follows the form factor better like stainless oil cooler lines. It looks like that was like it was suppose to... or meant to... look like as "serviceable" vs. non serviceable. GC

LOL........I am not sure what you are thinking but this IFPR that Phil designed with the Allen Head screws is a very nice piece of work and is a perfect fit with the other Allen Head Stainless Steel bolts on the Plenum and coolant pipes.

And it is completely serviceable without removing anything else. The only item you would want to service would be the Delphi Fuel Pressure Regulator that Phil installed in the modified Stock Fuel Pressure Regulator Housing. I expect that to change out the Delphi would take a couple of minutes with only a small Allen Wrench.


https://cimg2.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/400x400-1/80-f20_6e398eb8d56edc2c87516d558819f1ed552e4baa.jpg

[GOLDCYLON]

LOL........I am not sure what you are thinking but this IFPR that Phil designed with the Allen Head screws is a very nice piece of work and is a perfect fit with the other Allen Head Stainless Steel bolts on the Plenum and coolant pipes.

And it is completely serviceable without removing anything else. The only item you would want to service would be the Delphi Fuel Pressure Regulator that Phil installed in the modified Stock Fuel Pressure Regulator Housing. I expect that to change out the Delphi would take a couple of minutes with only a small Allen Wrench.

A couple of minutes IS a total win ! :saluting:

[Dynomite]

A couple of minutes IS a total win ! :saluting:

The Delphi was rotated just a tad counterclockwise in the photo which only took a minute to loosen the Allen Head screws
It definitely is a thing of beauty :thumbsup::thumbsup:

https://cimg2.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/350x400-1/80-fuel_13_34f4b91e4a948dd4641fff3a59315b79076b05f2.j pghttps://cimg2.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/350x400-1/80-f20_6e398eb8d56edc2c87516d558819f1ed552e4baa.jpg

I was trying to hot wire the Fuel Pumps using the Fuel Pump Test Connection which for the early 1990 (first 500) Marc says resides to the right of the battery. Marc also said it is sometimes hidden. I removed the battery and yes......it is definitely hidden as it was nowhere to be found :D

So....to test higher fuel pressure I just removed the vacuum line at idle and got the 52 psi fuel pressure. Again......I have run into a couple Failed Fuel Pressure Regulators and they DO require removal of the Plenum to fix. NOT ANY MORE :dancing

DO NOT TOSS A FAILED FUEL PRESSURE REGULATOR

[Dynomite]

Phil.......can I just keep this one :D

https://cimg2.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/350x400-1/80-f20_6e398eb8d56edc2c87516d558819f1ed552e4baa.jpg

I have been driving every day and even a 100 mile trip.....
Perfect all the way.....NO ISSUES.....

Just let me keep this Improved Fuel Pressure Regulator on the ZR-1 for a while longer at least until mid April if possible as I will park this 1990 #72 for a while at that time.

https://cimg6.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/800x600-1/80-img_2496_a6fe4941255ebf201ad7767db848a33a1e1fd87b. jpg

[Jagdpanzer]

Sure Cliff, keep it as long as you want.


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[WVZR-1]

It looks like the Delphi should be rotated just a tad counterclockwise in the photo which would take only a minute to loosen the Allen Head screws but I did not want to mess with this prototype as was not sure if Phil used Loctite or not. Did not want to loosen anything on this prototype as there was NO leaks when I received it :p

It definitely is a thing of beauty :thumbsup::thumbsup:

https://cimg9.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/350x400-1/80-fuel_10_b76490bd5030f7fe43bc54d50dba941b60c0bd40.j pg



Dremel the bracket for nipple clearance I'd think. Orientation of the FPR looks to be fine.

[WVZR-1]

No......it looks just fine because the rubber connector is bent.......It would only take a second to rotate counter clockwise with Allen Head loose which I did not want to loosen on prototype. You can see the nipple in right photo is pointed to far clockwise.




I'm thinking a couple minutes counter-clockwise and you'll have issues with the retention ring hardware. What was and what is isn't relevant. Look at the Lingenfelter adjustable in post #26.

[WVZR-1]

OR you could have used the "Dremel" and been done before NOON

You need to remember it's an "engineering sample" that you were afforded the opportunity to "test drive" - that particular one is as it is!!! The likely hood of releasing the FPR and rotating it and compressing again into the cavity I believe creates potential sealing issues. The original Delphi using the snap-ring retention into a formed/rolled cavity I'm quite sure was susceptible to leaking when removed and reinstalled. I've had many 3800's that used that style of FPR.

https://cimg2.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/350x400-1/80-fuel_13_34f4b91e4a948dd4641fff3a59315b79076b05f2.j pg

[5ABI VT]

Can put me in line :-D ! not too long ago I started wondering if welding an fittings to the rails and installing my own adjustable unit was the way to go but I have no need for an adjustable unit.. this looks great =D>

[Jagdpanzer]

Here are photos of the steps I used for adapting the Delphi FP10016 fuel pressure regulator to the original LT5 fuel pressure regulator base:
7038
Machining off the old cap

7039
7040
Failed regulator had a ruptured diaphragm

7041
Drilling hole in base for pressing out old hardened valve seat

7042
7043
Pressing out old valve seat




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[Jagdpanzer]

http://i540.photobucket.com/albums/gg333/pwasinger/IMG_1149_zpspexrsg51.jpg
Base internal machining

http://i540.photobucket.com/albums/gg333/pwasinger/IMG_1182_zpscfm1a0dj.jpg
Fabing retainer ring

http://i540.photobucket.com/albums/gg333/pwasinger/IMG_1177_zpscb3fkwle.jpg
Threading retainer ring screw holes in base

http://i540.photobucket.com/albums/gg333/pwasinger/IMG_1189_zpsllwjolzm.jpg
Parts laid out ready for assembly

[Jagdpanzer]

http://i540.photobucket.com/albums/gg333/pwasinger/IMG_1190_zpsikzdyriq.jpg
Plug in base installed

http://i540.photobucket.com/albums/gg333/pwasinger/IMG_1194_zpsfxszsvyi.jpg
O-ring seals installed

http://i540.photobucket.com/albums/gg333/pwasinger/IMG_1195_zpsohsmjspc.jpg
Regulator inserted in base

http://i540.photobucket.com/albums/gg333/pwasinger/IMG_1198_zps4sgktemf.jpg
Retainer ring attached

http://i540.photobucket.com/albums/gg333/pwasinger/IMG_1199_zpst72m6f8w.jpg
Finished!

[-=Jeff=-]

You need to start an exchange program.. minimize downtime for those interested

[secondchance]

That's so Industrial Age chic.:cheers:

[Ccmano]

Appears somewhat labor intensive Phil. Once the process is sorted out what do you think the time per unit will be? Will you do it yourself or farm it out?
H
:cheers:

[Jagdpanzer]

My lathe and mill are simple manual machines so set up time between steps consumes more time than I like at my leisurely pace. Was able reduce the time to turn out the retainer ring to 30 min. Rest of the machine work, cleanup, and assembly takes about 2 hours.
Producing several at one time I’m sure would improve efficiency.


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[Scrrem]

Very nice work Phil!
Rich

[Dynomite]

Fuel Pressure Accelerating and on Cruise.
(Engine in Full Power Setting for all tests) A 1995 ZR-1 with Stock FPR and a 1990 with IFPR were tested with identical results.

https://cimg6.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/400x400-1/80-img_2632_18cedbc38107145546d4bdd7d9e774915a2b5bd9. jpghttps://cimg2.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/400x400-1/80-f20_6e398eb8d56edc2c87516d558819f1ed552e4baa.jpg

No issues........no stumbling in any gear and very smooth in cruise.

A. Cruising in 1st-5th at speeds up to 60mph resulted in Fuel Pressure of 42 psi except when decelerating pressure dropped to 38 psi.
B. Accelerating in all speeds resulted in Fuel Pressure increasing smoothly to 48 psi while accelerating only then the pressure backed down to 42 psi while cruising.
C. At FULL Throttle the Fuel Pressure spiked at 52 psi in all gears.
D. Cruising at 80 mph in 6th gear resulted in Fuel Pressure stabilized at 43 psi just a tad above idle pressure of 42 psi

[B]This is identical to what BlackZR1 experienced while testing Fuel Pressure while Driving.
With the extension hose and pressure gage on the dash I went for a drive. I expected that as fuel demand goes up there would be step change in pressure when the secondary pump came on. Instead, what I saw was that at idle the pressure sat at 42 psi and as I stepped on the gas pedal regardless of engine or car speed the pressure would rise smoothly and proportionate to the gas pedal. Pressure rises to 52psi by the time the pedal was about ½ way down. Any momentary or sustained WOT resulted in a 52psi pressure. So all is good.

Short roundtrip to Fresno (100 miles).....No issues and no stumbling in any gear and very smooth in cruise.
Getting 27mpg - 28mpg in sixth gear going 70mph which was identical to mileage using Stock Unmodified FPR which indicates the IFPR behaves exactly like a Stock FPR that BlackZR1 Tested While Driving with various Throttle Positions.

1990 LT5 and 1995 LT5
https://cimg0.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/400x400-1/80-2_1ca418351f2fd09538f31592c5359a2722289df2.jpghttp s://cimg0.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/400x400-1/80-img_2631_7329def22c9a0798b0b32d38a3691049c30a5349. jpg

Post 281 - The Improved LT5 Fuel Pressure Regulator (https://www.corvetteforum.com/forums/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-15.html#post1596384563)

[XfireZ51]

Out of curiosity, have u pulled any of the spark plugs?

[Dynomite]

Just completed installation of the IFPR on a 1990 ZR-1 #3032 and 1990 ZR-1 #2067.
The Performance is identical to the IFPR in the 1990 ZR-1 #72 and the 1995 ZR-1 #186.
(I have installed four Improved Fuel Pressure Regulators all of which perform perfectly).

https://cimg2.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/400x400-1/80-f20_6e398eb8d56edc2c87516d558819f1ed552e4baa.jpght tps://cimg6.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/400x400-1/80-img_2646_75c2e7d44cc064a429fe85f82b1b83944ac891fd. jpg
https://cimg0.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/800x800-1/80-img_2758_b612c079e79480417ce6ae24b480d54f3764819b. jpg
https://cimg4.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/800x800-1/80-img_2648_e910b6efa1eb6856a8526bbec4214184726e9598. jpg

When you are installing the Improved Fuel Pressure Regulator, also install the New Secondary Port Throttle Vacuum System for zero vacuum leaks and the Rebuilt 124 Amp O'Reilly's Alternator.

Post 283 - Phil's (Jagdpanzer) Fuel Pressure Regulator Solution (https://www.corvetteforum.com/forums/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-15.html#post1596384578)
Post 284 - New Secondary Port Throttle Vacuum System (https://www.corvetteforum.com/forums/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-15.html#post1596384583)
Post 285 - Alternators (https://www.corvetteforum.com/forums/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-15.html#post1596384585)

[-=Jeff=-]

how do we procure one?

[Jagdpanzer]

Jeff,
I will be glad to do one for you however, I will need your core as I do not have any extras myself. $165 covers a new Delphi FP10016 regulator, machine work, necessary seals, hardware and assembly. Return shipping and insurance runs around $15. Turnaround time is 2 to 3 days provided family or work obligations don't get in the way.

[-=Jeff=-]

Phil, that sounds great, however, I will have wait until fall, it is now driving season, I want to enjoy the car for the summer

[5ABI VT]

Got my gaskets and o rings from Jerry just a few days ago. I’m hoping to have mine out and on the way very soon !

[RichS]

I sent Phil a spare regulator to have done, I put it on a week ago and drove it once to check it out. Pressures are right where they should be, I found a broken u-joint on a 1/2 shaft so I need to swap that out before taking it out for a long ride. I think I've had the upper off a few too many times, took less than a hour to swap out. Thanks again Phil!:cheers:

[Top Toy]

[QUOTE=RichS;279028]I sent Phil a spare regulator to have done, I put it on a week ago and drove it once to check it out. Pressures are right where they should be, I found a broken u-joint on a 1/2 shaft so I need to swap that out before taking it out for a long ride. I think I've had the upper off a few too many times, took less than a hour to swap out. Thanks again Phil!:cheers:[/QUOTE

Rich - you're just going to have to cut back on those full throttle launches!😉

[Dynomite]

One more ZR-1 with the Improved Fuel Pressure Regulator Installed. I also install new Secondary vacuum systems when I am under Plenum for ZERO vacuum leaks...Vacuum pump fires up when switch on and just does not come on again for a long long while :D

https://cimg1.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/800x500-1/80-img_2802_1d2dc7ce1d141605c28e661b1deef1c4749204ac. jpg
https://cimg3.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/800x600-1/80-img_2814a_714a87aaa83b9188d89c58541e309b7af717e075 .jpg
https://cimg9.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/800x600-1/80-img_2816_bc29cdb0202335e645cf72b15bae78eb980e476d. jpg
https://cimg0.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/800x800-1/80-img_2758_b612c079e79480417ce6ae24b480d54f3764819b. jpg
https://cimg2.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/400x400-1/80-f20_6e398eb8d56edc2c87516d558819f1ed552e4baa.jpght tps://cimg6.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/400x400-1/80-img_2646_75c2e7d44cc064a429fe85f82b1b83944ac891fd. jpg


When you are installing the Improved Fuel Pressure Regulator, also install the New Secondary Port Throttle Vacuum System for zero vacuum leaks and the Rebuilt 124 Amp O'Reilly's Alternator.

Post 283 - Phil's (Jagdpanzer) Fuel Pressure Regulator Solution (https://www.corvetteforum.com/forums/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-15.html#post1596384578)
Post 284 - New Secondary Port Throttle Vacuum System (https://www.corvetteforum.com/forums/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-15.html#post1596384583)
Post 285 - Alternators (https://www.corvetteforum.com/forums/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-15.html#post1596384585)

[5ABI VT]

Thought I’d share here a few pics I put on my Instagram. Big thanks to Phil the regulator looks awesome and turnaround time was super fast even being in Canada 🇨🇦.

Pics of my old internals
https://s19.postimg.cc/skcsoudyb/7_A1416_BD-61_B4-4087-_A137-38_E485_A1022_C.png (https://postimg.cc/image/cm42ypjq7/)

Can see obvious signs of aging but who knows if and when it may have failed or started to affect function. Peace of mind that it’s brand new now :)

https://s19.postimg.cc/m6nplk6hf/1_EC4_C20_B-_DB6_D-4_F9_A-9_DE6-948279685839.png (https://postimg.cc/image/jckk844b3/)

[Dynomite]

Thought I’d share here a few pics I put on my Instagram. Big thanks to Phil the regulator looks awesome and turnaround time was super fast even being in Canada 🇨🇦.

Pics of my old internals
https://s19.postimg.cc/skcsoudyb/7_A1416_BD-61_B4-4087-_A137-38_E485_A1022_C.png (https://postimg.cc/image/cm42ypjq7/)

Can see obvious signs of aging but who knows if and when it may have failed or started to affect function. Peace of mind that it’s brand new now :)

https://s19.postimg.cc/m6nplk6hf/1_EC4_C20_B-_DB6_D-4_F9_A-9_DE6-948279685839.png (https://postimg.cc/image/jckk844b3/)


Lots of posts here about injector failure...…...as I also found out we now know part of the reason as that fuel from the Fuel Pressure Regulator is not filtered (those rust particles have to go somewhere and I doubt most can pass through the injectors) ;)

I have replaced ALL Fuel Pressure Regulators with the Phil Modified Fuel Pressure Regulator and if the injectors have not failed yet, they will now last a very long time.

Post 281 - The Improved LT5 Fuel Pressure Regulator (https://www.corvetteforum.com/forums/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-15.html)

[fangronin]

Not to revive an old thread, but are these rebuilt FPR's still offered? I am in need of one...

[Dynomite]

Not to revive an old thread, but are these rebuilt FPR's still offered? I am in need of one...

Send PM to Jagdpanzer :thumbsup:

[fangronin]

Send PM to Jagdpanzer :thumbsup:

I tried, but his inbox is full, lol. That's why I posted here.

[Jagdpanzer]

Try sending again

[SCZR-1]

Are you able to do another FBR. I am in need of one and can send old one immediately. Tried to PM but wouldn't go through. Thanks, Roy

[Jagdpanzer]

Yes, I can do one for you.
Please try sending a PM again.


Sent from my iPhone using ZR-1 Net Registry (http://r.tapatalk.com/byo?rid=90383)

[Erik]

I received my regulator from Phil yesterday, and just wanted to share what a beautifully made piece it is. It's engineering art. Ettore Bugatti would have happily used one on his cars. So not only will my engine bay be more beautiful, but also I'll not have to worry about FPR availability in the future.

Thanks, Phil!