Plenum & Injector Housing Porting

[jss06c6]

Gents,

Thanks to Constantine, I've got a spare Plenum and pair of Injector Housings to port without shutting #473 down. I've read, with great interest, Keith's (KJL) thread on Corvette Forum. My goals are the same. I've got a '91 and my Plenum looks identical to Keith's. However, the one I got from Constantine shows straight pipe nipples just below the TPS, versus the rear one being curved. Is this something to be concerned about? I was also surprised to see that the Injector Housings were "chamfered". Obviously there was an attempt to eliminate a sharp edge at the transitions from the Plenum and the Heads..

I'd like to get a "junk" injector to verify how much I can take off the primary boss. I understand it can essentially be completely removed, just want to get an eye on it before I put a burr to it.. If anyone has a junk one laying around, I'll be happy to pay to have it shipped..:cheers:

Got everything cleaned up. Here's a few photos showing the chamfers and the injector bosses.. Would appreciate some guidance on the pipe geometry (not sure what these two are, will need to check my docs)..

[jss06c6]

Can anyone shed some light on my question regarding the piping configuration difference on this plenum and the one in my car? The rear pipe on mine is curved back toward the underneath side of the plenum.. Do I have to replace this tubing to match the geometry on my '91, or simply adjust the hose configuration to enable me to install it?

[A26B]

Yes, you will have to change the rear pipe. The 2 straight pipes are for 1990 only


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[jss06c6]

Thanks Jerry! Is it available somewhere? Is it installed with something like JB weld?

Much appreciated!

Steve

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[Marc Haibeck]

Some injector housings were machined with chamfers to compensate for core shift in the castings. The correct port center is at the top of the chamfer. This problem was solved in '93 when the chamfer was blended 1.5 inches into the port for a smooth transition. This was a part of the 405 hp upgrade.

The crankcase vent flow restrictor configurations are different on the '90 verses '91 and later injector housings. To make your '90 housings compatible with your '91 cylinder heads you need to drill the small holes in the '90 flow restrictors to at least 3/4" to remove the restriction. When you are shopping for the EVAP tube at Jerry's, look at the injector housing index 10D3 on the 5th page of the Intake section. It shows the unrestricted crankcase vent ports. If they are not drilled out the engine will be double restricted because the restrictions are also in the cylinder heads for '91 and up.

[jss06c6]

Thanks very much Marc. Looks like these injector housing castings were pretty far off then. Found the tube on Jerry's site.

Steve

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[A26B]

I have a more in-depth review of the different Injector Housings on my website under the Category "Technical Data." Here's a link to it. There's no charge for any of the Technical Data, just put it in your cart & checkout like you would for parts. Afterwards, you are authorized to download it and save it to your computer if you like.

http://www.jerrysgaskets.com/fuel-injector-housing-guide/

[jss06c6]

That's great! Thanks very much Jerry...

Merry Christmas everyone..😊

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[jss06c6]

Resurrecting this older thread as I'm now starting the top end porting work. Port matching the plenum and injector housings has been straight forward on three sets that I now have. While I haven't put a burr in the castings yet, I'm happy with the relative alignment between the plenum and the injector housing runners.

I can't say the same about the primary runners between the injector housings and the heads. They are considerably off centerline. With no porting, there is a shift between the two resulting in a sharp step, which would really hammer the flow pattern. The offset isn't there with the secondaries, only the primaries. Placing the gasket on the head, then comparing it to the injector housing quickly shows the very poor port matching..

If my '91 is anywhere close to a representative example, I understand why the LT-5 responds so we'll to top end porting..

I'll try to get a couple of pics tomorrow morning to post for illustration.

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[XfireZ51]

Steve,

Yeah GM left a lot of meat on that bone.

[Marc Haibeck]

Mercury Marine corrected the port mismatch problem in '93. It was part of the 405 hp upgrade. They CNC blended the injector housing ports 1.5" down the port. They also increased the plenum port diameter from 33 to 34 mm. That's why porting an early engine well will add 35 hp. Only 20 hp can be gained on the '93 and up engines.

[jss06c6]

Here's a couple of pictures to illustrate.. note that using the gasket as a reference, the head ports are concentric, while the injector housing ports are shifted, dramatically on the primary runners..[ATTACH][ATTACH]

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[jss06c6]

As point of reference, these are the original injector housings from this engine..

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[XfireZ51]

Steve,

One thing I did when I first ported the top end is to use a double fluted burr (I think that’s what its called) and then I finished things off by bolting everything together and using a 38mm ball hone to smooth out the transition.

[jss06c6]

Thanks Dominic.. I'm using three different burrs depending on where I am in the runner.

I need to know if this is sufficient removal of the primary injector boss.. hesitant to get deeper, but certainly still have room..

Yes, I touched the face with a burr! Very, very minor..

[ATTACH][ATTACH]

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[jss06c6]

Took a bit more off.. better transition now..

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[jss06c6]

Moving on to next primary..[ATTACH]

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[tiegsd]

Just had my original injectors replaced, 4 of them are no good. Happy to donate a couple to the cause.

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[Paul Workman]

Just had my original injectors replaced, 4 of them are no good. Happy to donate a couple to the cause.

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The 90 injector housing is the only one that you can eliminate the primary injector boss entirely as the injector seal is @ the top of the injector. Maybe you realize that, IDK.

More later...

[XfireZ51]

Thanks Dominic.. I'm using three different burrs depending on where I am in the runner.

I need to know if this is sufficient removal of the primary injector boss.. hesitant to get deeper, but certainly still have room..

Yes, I touched the face with a burr! Very, very minor..

[ATTACH][ATTACH]

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If u don’t punch thru, ur not trying. 🤣🤣🤣

[jss06c6]

The 90 injector housing is the only one that you can eliminate the primary injector boss entirely as the injector seal is @ the top of the injector. Maybe you realize that, IDK.

More later...Paul,

The '91 is the same. The Primary injector O-Ring is at the top of the boss. The secondary injector utilizes an O-Ring on the end of the injector, so you can't remove that one, but the secondaries aren't the big choke on the airflow.. the primaries are..

Steve

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[jss06c6]

If u don’t punch thru, ur not trying. 🤣🤣🤣I hear ya! I'm probably not that bold!![emoji12]

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[jss06c6]

Just had my original injectors replaced, 4 of them are no good. Happy to donate a couple to the cause.

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Thanks! I pulled one of my primary injector to check the first runner. I've got a good visual now as to where I want the profile geometry to be. I think I'm ok at this point. I really appreciate the offer!

Steve

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[tiegsd]

Np. [emoji41]

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[jss06c6]

One done.. second one will get a little more relief around the primary injector bosses and then flip it and open up the plenum side. Interesting that the secondary ports in the injector housings are chamfered on the plenum side, but full 36.2 mm on the head side.. need to pick up some more ball nose burrs tomorrow. The Foredom flex shaft grinder is super! At 1/3 horse, you can't bog it down and the foot control is a blessing for variable speed work and shut down control..[ATTACH][ATTACH][ATTACH]

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[jss06c6]

Thought I'd share some of my experience porting the head side of the injector housings. The primary injector bosses are a significant cause of turbulence in the air stream. While crossectional area increase results in less pressure required per cubic foot of air moved per minute, putting hard angles, sharp edges where ports don't align and big lumps like injector bosses in the fluid stream are huge causes of turbulent flow. In a pipe, turbulent flow is a huge contributor to reduced volume. Smoothing out the fluid stream flow promotes laminar flow versus turbulent flow.

I take a 3/8" x 5/8" ball nose burr and, using the scribe mark to identify my target diameter, I remove material at a 90 degree angle to the face of the housing. Then I use the straight side of the burr to remove the injector boss. This is followed by an oval burr to establish a symmetric bowl and port runner... No obstructions and achieving Target crossectional area. The result is a runner port with better flow than the secondary Port since I can't remove the injector boss in that port (O-Ring is on the tip of the injector on secondaries).

I might see if I can get one of my stock housings and a ported one on a flowbench to check results.. if so, I'll post results..[ATTACH][ATTACH][ATTACH]

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[jss06c6]

Unported vs ported. Plenum side[ATTACH][ATTACH][ATTACH][ATTACH]

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[jss06c6]

Friend with a Superflo 1020 flowbench took one of my ported injector housings and a stock IH to run some flow comparisons. Stay tuned..

I placed one of my ported Injector Housings on the passenger side head (still have some cleanup to do). I'm amazed at the offset in the primary port! Can't help but believe this will add as much or more than the SW headers and 3"exhaust did. I'm amazed these engines did what they did choked off on both the intake and exhaust. Looks like I'll be adding a bunch of fuel and some advance to the tune!!

Secondaries look pretty good on the head port alignment, but off on the plenum side..[ATTACH][ATTACH]

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[XfireZ51]

Steve,

The stock LT5 was good for 500hp had it not been choked up top and at the exhaust. We’re talking 1990. Imagine the earthquake that would have caused in the automotive world.

[jss06c6]

Steve,

The stock LT5 was good for 500hp had it not been choked up top and at the exhaust. We’re talking 1990. Imagine the earthquake that would have caused in the automotive world.
Dominic,

I sold my 2010 ZR1 and kept my '91 ZR-1 because of the huge technological shift in a naturally aspirated engine in 1990. This engine has a ton of potential. Imagine what current techniques would yield using this platform as a base! This is just damned fun to work with!!!


Steve

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[jss06c6]

Slow and steady.. one side of the plenum complete.7754

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[Top Toy]

You may want to consider eliminating the secondaries while you're in there.

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[jss06c6]

You may want to consider eliminating the secondaries while you're in there.

Sent from my HTC U11 using ZR-1 Net Registry mobile app (http://r.tapatalk.com/byo?rid=90383)Thanks, I've thought of this, but my tune brings the secondaries in earlier and I like the way the car drives right now. Cruises nicely and screams when I ask her to.. that said, with the radical change in the primary ports and runners, who knows what #473 will feel like after a new tune..

I'd probably take the secondaries out after a cam upgrade for sure..

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[Ccmano]

Just took the secondaries out on mine. I’ll let you know what I think shortly. The car will be on the road for the first time later today.
H
:fahne:

[Paul Workman]

Just took the secondaries out on mine. I’ll let you know what I think shortly. The car will be on the road for the first time later today.
H
:fahne:

I predict you're gonna like the instant throttle response. Subtle, yes. But! Unmistakable! (Did I mention less coking on the secondary valves??:-D

I pulled mine initially b/c of repeated (old stuff) failures. But, later my porting cross sections went beyond 36mm on all ports, leaving the SPTs sorta hanging in the breeze w/ nothing to do. So...OUTATHERE! (And, never looked back. And, NEVER regretting it for a heartbeat...dating back to 2010!:dancing

[jss06c6]

Flow numbers on one primary and one secondary Port. Using SuperFlo 1020. This is comparison of one stock '90 injector housing vs. one ported '91 injector housing. Longitudinal center of the runners in the ported housing are 32.5 mm, smoothed. The ports are 36.3 mm and the primary injector boss is removed. I suspect a little more is available by opening center up to 36.3 mm, but don't expect much more than 3-4 cfm gain. Secondary showed almost no gain over unported.. again, centers can be opened a bit more..

Will be finishing up, bolting together and running full suite of flow tests on all runners.77697770

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[jss06c6]

Port matching heads now. IH's and Plenum finished. Next step is to pull the valve covers and send everything out for powder coating.. [ATTACH]

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[Top Toy]

Nice job! You're going to really enjoy the end result!

[jss06c6]

Heads port matched. I'm flow testing the assembled plenum/injector housings as well. Next will be removal of cam covers and stripping throttle body down before sending everything out to powder coating. During the wait, I'll be completing the swap to R134, doing a brake job and cleaning the engine valley and front end.

Anyone know where I can get a new set of secondary vacuum actuator valves?

Steve[ATTACH][ATTACH]

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[HAWAIIZR-1]

Nice work and very impressive.You’re a pro!! If you do find new secondary vacuum actuator valves, make sure they are tested to hold and you can return/exchange if defective. When I found my NOS I had to return a few.


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[jss06c6]

Nice work and very impressive.You’re a pro!! If you do find new secondary vacuum actuator valves, make sure they are tested to hold and you can return/exchange if defective. When I found my NOS I had to return a few.


Sent from my iPhone using ZR-1 Net Registry (http://r.tapatalk.com/byo?rid=90383)Thanks! My actuators are working fine, just a bit rusty. I may just epoxy coat them and roll with it if I can't find any NOS.

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[Ccmano]

I have a set of vacuum Actuators. PM sent.
H
:cheers:

[jss06c6]

I have a set of vacuum Actuators. PM sent.
H
:cheers:
Saw that and responded Hans..

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[HAWAIIZR-1]

Thanks! My actuators are working fine, just a bit rusty. I may just epoxy coat them and roll with it if I can't find any NOS.

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You’re welcome and best wishes. I have a bunch of NOS parts to get rid of and will try to post them soon. I think I have about 6 actuators, but I know you’re trying to get your project wrapped up now.

[jss06c6]

You’re welcome and best wishes. I have a bunch of NOS parts to get rid of and will try to post them soon. I think I have about 6 actuators, but I know you’re trying to get your project wrapped up now.Thanks! Will be interested in your "inventory"!

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[jss06c6]

Got the numbers back yesterday on flow test of assembled and ported Plenum and Injector Housings. This was with a Superflo 1020.. we checked cylinders 4 & 5..

Cylinder 4 Primary 174 cfm
Cylinder 4 Secondary 178 cfm

Cylinder 5 Primary 173 cfm
Cylinder 5 Secondary 176 cfm

Total flow both ports open

Cylinder 4 - 352 cfm
Cylinder 5 - 349 cfm

Trouble with removal of one torx screw on one TB blade. Got it out, but will need to retap and possibly use slightly larger screw. For those who decide to tear down their TB for porting or as in my case, powder coating, be aware of the spot welds on the ends of the screws after they are installed! Locktite would have been a much better method than this!

Pulling brake booster to remove last two driver side cam cover bolts so I can get everything out to powder coat next week..

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[jss06c6]

Well pulling the brake booster was a major PITA! The lower two lock nuts are "relatively" easy to remove, but the upper two require dropping the steering column and removal of the cruise control vacuum can, ECM, etc.. not a job for the faint of heart for sure.. passenger side is simple, just remove the evaporator coil cover near the firewall.

I used an impact to remove the Torx 40 cam cover bolts. This was easy, none of the bolts gave me any crap. Had to remove a few with a long handle 3/8" flex head rachet. I bought a set of "stubby" Torx 3/8" & 1/4" drives as well.

Cams look very good. Very light polish on the lobes. Prepping everything for powder coat..[ATTACH][ATTACH][ATTACH][ATTACH][ATTACH][ATTACH]

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[Mystic ZR-1]

Helpful hint:
Take the driver's seat out, 4 nuts and a
couple electrical connectors. Makes working under
the dash MUCH easier!
Besides, no telling what you'll
find there...

[jss06c6]

Helpful hint:
Take the driver's seat out, 4 nuts and a
couple electrical connectors. Makes working under
the dash MUCH easier!
Besides, no telling what you'll
find there...Thanks! I've done that before.. I had the car on my lift so that I could stand at waist height and reach under pretty easily. The issue for me was gaining access to the top two nuts. I literally could not get a rachet anywhere near them. Dropping the steering column let me get a straight shot with a LONG extension and a deep 1/2" socket..

Everything headed to powder coat this week!

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[Ccmano]

Thanks! I've done that before.. I had the car on my lift so that I could stand at waist height and reach under pretty easily. The issue for me was gaining access to the top two nuts. I literally could not get a rachet anywhere near them. Dropping the steering column let me get a straight shot with a LONG extension and a deep 1/2" socket..

Everything headed to powder coat this week!

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Looking good Steve. I remember doing my first Z that way. It was a pain. I actually think it was easier to just pull the whole engine.
H
:cheers:

[jss06c6]

Looking good Steve. I remember doing my first Z that way. It was a pain. I actually think it was easier to just pull the whole engine.
H
:cheers:
When I had my transmission out and with Bill B, I should have pulled the engine! Definitely would have been easier..

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[jss06c6]

All parts back from powder coat. Finally going back together starting today. Gloss Black and Flame Red are going to look great on '91 #473! I'm ready to get this thing on our Dyno and throw some fuel at it. Gotta look good going fast, eh? I'm staying with OEM black for the cam cover bolts.[ATTACH][ATTACH][ATTACH]

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[32valvZ]

Beautiful! ;)

[jss06c6]

TB reassembled and ready.. the 6-0.6 metric Torx screws gave me fits removing them (small tack weld used to lock them in place). I swapped over to 8-32 button head screws and used blue thread locker. Much easier and will allow future rebuild if necessary. No DAG needed. Throttle plates have virtually no light around them! On to the final valley cleaning and reassembly..[ATTACH][ATTACH][ATTACH][ATTACH]

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[Ccmano]

Oooh, very pretty, very shiny. Can’t wait to see it all put together Steve. I do think that stainless bolts would really pop on those shiny black cam covers and the plenum.

Btw, I’m leaving on the Elk Hunt tomorrow, been really looking forward to this.
H
:cheers:

[jss06c6]

Hans,

Thanks! Your killing me with elk envy!! I need pictures!!

Steve

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[efnfast]

Your color choice is very close to mine. I left the center strip in the plenum brushed aluminum. And I used the SS allen head caps for bolting.

[jss06c6]

Your color choice is very close to mine. I left the center strip in the plenum brushed aluminum. And I used the SS allen head caps for bolting.Where did you get the SS Cap Screws? Jerry has them for the cam covers, what about the plenum to injector housings bolts?

Steve

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[efnfast]

Jerry has them all. They come in individually marked bags. I'm sure we pay a premium from Jerry, but that's ok.

[Paul Workman]

If I may suggest...

McMaster-Carr (https://www.mcmaster.com/)is one of the biggest industrial supply outfits. They offer a huge catalog and have on-line ordering. (M-C is where i got the bolts you are asking about, but there are other sources as well.)

FASTENAL (https://www.fastenal.com/) is another industrial supply store. They're smaller than MC, but do carry most everything for my cars I ever needed, including many electrical connectors (e.g., Weather Pack, etc.) Check for local listings.

And, believe it or not, good ol' ACE HARDWARE too has a decent selection of fastener type hardware including "grade 8" stuff like flywheel bolts, I have found.

Home Depot and Menards too carry a good bit of nuts/bolts/screws/etc.

Anywayz... These are some of my favorite sources for fastener hardware of all kinds.

[XfireZ51]

Where did you get the SS Cap Screws? Jerry has them for the cam covers, what about the plenum to injector housings bolts?

Steve

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Steve

I found mine at ACE.

[jss06c6]

Thanks all! You guys have me convinced to swap to SS..

Steve

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[A26B]

Where did you get the SS Cap Screws? Jerry has them for the cam covers, what about the plenum to injector housings bolts?

Steve

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Steve,
I have SS bolt kits for the entire top side and also have individual applications listed.

http://www.jerrysgaskets.com/stainless-steel-bolts/

[Ccmano]

Here are all the bolt specs.

Bolts
Cam Cover
48- 8x1.25x55
6 - 6x1.0x25

Coolant Pipe
8 - 6x1.0x50

Plenum to IH
12 - 8x1.25x25

TB coolant cover
5 - 4x.70x14

Air Horn
2 - 5x0.8x16

Dowty washer
OD 0.563
ID 0.315 or 0.284

Have fun,
H


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[efnfast]

Jerry makes this real easy. Might cost a couple extra bucks, I think money well spent.

[jss06c6]

Steve,
I have SS bolt kits for the entire top side and also have individual applications listed.

http://www.jerrysgaskets.com/stainless-steel-bolts/Order will be coming your way Jerry!

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[wdo-mkr]

I would vote for supporting small business where one can.

[jss06c6]

I would vote for supporting small business where one can.As a fellow small business owner, I agree!

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[jss06c6]

Finally turning the corner.. new condenser installed, cam covers and injector housings installed. Brake booster next (ugh!!).[ATTACH][ATTACH]

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[jss06c6]

Just a couple of pics.. should be firing up and starting the new tune in few days..83258326

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[XfireZ51]

Looks righteous.

[jss06c6]

Looks righteous.Thanks Dominic! I'm very happy with how it turned out. Going to throw some fuel at it and get it on our Dyno to get the tune going as soon as possible.

Steve

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[Ccmano]

Just a couple of pics.. should be firing up and starting the new tune in few days..83258326

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Sweet! Those stainless bolts look great against the black finish.
H
:cheers:

[jss06c6]

Working on video link. Fired it up today. Couldn't be happier. Purrs like a cat. No leaks, no codes, no problems. Now on to the tuning! [ATTACH][ATTACH]

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[A26B]

[emoji106][emoji122]

=D>:cheers:


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[jss06c6]

[emoji106][emoji122]


Sent from my iPhone using ZR-1 Net Registry (http://r.tapatalk.com/byo?rid=90383)Thanks for the parts Jerry! It really looks good and all gaskets are perfect!

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[Ccmano]

Very, very nice...! Where’s that video link?
H
:cheers:

[jss06c6]

One of my techs is trying to get it "pretty" and on our YouTube channel. I'll see if he's got it there yet.

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[zr1assassin]

What's your YouTube channel name?

[jss06c6]

Video link..

https://www.youtube.com/channel/UCRk0FeltVf6DbE_uaBS5mFw

Will get it on our Dyno next week and get another video posted..

Steve

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[Ccmano]

Good work. Now on to the Dyno...
H
:cheers:

[gtcollins@maxnet.co.nz]

Good to see it going liked the video

Glen

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[jss06c6]

First pass on Dyno. 359 rwhp, 405 rwtq. Engine is VERY rich. Could not log this pass as I needed to use my laptop to control the Dyno. Have this resolved now, so will begin WOT tuning to get AFR to 12.8-13.1 range..

https://youtu.be/2JXzs1lDTBk


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[Ccmano]

The engine is ported and you have headers, if I’m not mistaken your running stock flywheel. What exhaust do you have?

Mine is going to the Dyno later today with Doms latest tune. We can compare notes.
H
:cheers:

[XfireZ51]

The engine is ported and you have headers, if I’m not mistaken your running stock flywheel. What exhaust do you have?

Mine is going to the Dyno later today with Doms latest tune. We can compare notes.
H
:cheers:

Hans,

We didn’t optimize that part of the tune. I’ll be curious to see how it does as is.

[XfireZ51]

First pass on Dyno. 359 rwhp, 405 rwtq. Engine is VERY rich. Could not log this pass as I needed to use my laptop to control the Dyno. Have this resolved now, so will begin WOT tuning to get AFR to 12.8-13.1 range..

https://youtu.be/2JXzs1lDTBk


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Steve,

Is this SAE?

[Ccmano]

Hans,

We didn’t optimize that part of the tune. I’ll be curious to see how it does as is.

I going to have them run an AFR probe and measure it.
H

[XfireZ51]

I going to have them run an AFR probe and measure it.
H

If they’re running it on a dynojet, they can give you a file, not the paper copy and I can take a look at it with the Dynojet reader for analysis. If u could datalog the run also, that would be helpful.

[jss06c6]

Steve,

Is this SAE?This is loaded like Mustang Dyno, not Dynojet. Yes it is SAE smoothing.

Steve

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[jss06c6]

The engine is ported and you have headers, if I’m not mistaken your running stock flywheel. What exhaust do you have?

Mine is going to the Dyno later today with Doms latest tune. We can compare notes.
H
:cheers:Yes to all. I'm running Stainless Works fro headers to exhaust tips. 3" exhaust.

Steve

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[jss06c6]

The engine is ported and you have headers, if I’m not mistaken your running stock flywheel. What exhaust do you have?

Mine is going to the Dyno later today with Doms latest tune. We can compare notes.
H
:cheers:Yes to all. I am running stock FW now. Stainless Works exhaust.. headers through tips. 3" exhaust.

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[jss06c6]

Steve,

Is this SAE?Yes, SAE smoothed..

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[Ccmano]

Looks like we’re on the opposite side of the same boat. Mine was 364rwhp today but very lean. Doms going to add fuel and I’ll go back. With these mods we should be in the 390’s...
H
:cheers:

[jss06c6]

My techs believe I've got another 15-20 hp when I get the WOT fueling dialed in to 12.8-13.1. I was literally spitting raw fuel out the exhaust!

Going to dial back the PE and rerun next week when I've got some time to tune on the Dyno .

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[XfireZ51]

This was my dyno run w similar mods. I believe I had Magnaflow catback at this point.

[jss06c6]

Loaded 10% and Inertia pass. Inertia useless in my mind, but put it on the chart as well for giggles.. 369 rwhp loaded.. Like Dom's chart, it's impressive to see the engine carry the RWHP all the way to 7000 rpm!

[XfireZ51]

Loaded 10% and Inertia pass. Inertia useless in my mind, but put it on the chart as well for giggles.. 369 rwhp loaded.. Like Dom's chart, it's impressive to see the engine carry the RWHP all the way to 7000 rpm!

Yes this is a lovely characteristic of DOHC motors. They don’t crater after peak power as do “OHV” motors. Power stays flat. That’s a HUGE advantage.

[Top Toy]

What happened to your torque? Was 405 ft. lbs. when it was rich?

[jss06c6]

What happened to your torque? Was 405 ft. lbs. when it was rich?

Dyno setup had some issues.. that's resolved now. The first pass last week was accurate on the HP, but our setup for torque value was off a bit.. Now corrected..

[jss06c6]

Have had some time to experiment with fuel and spark on the top end after porting #473. Slowly sneaking up on what the engine likes using an MD1100 dyno. Have eased in another 2-1/2 degrees between 5500 & 6500 @100 KPA. Max knock retard 0.5 degrees. My fuel cutoff is still sitting at 7,042. The torque is slowly rolling off, but HP is still climbing at 7,000. 406 rwhp, 374 rwtq. How far have you guys pushed fuel cutoff with a stock bottom end?[ATTACH]

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[jss06c6]

Spark Table and Fuel Table, secondaries open.. Black curve is new, red curve is old. AFR hugging 12.8:1..

[XfireZ51]

Spark Table and Fuel Table, secondaries open.. Black curve is new, red curve is old. AFR hugging 12.8:1..

I found that the area ~ 4500-5500 rpm (max torque) is where the LT5 is prone to detonation. Beyond that, its pretty resistant to knock. The further u crank up timing at the top, the more u just see power drop, but w no indicated knock.

[jss06c6]

Thanks Dom.. How far can I push rev limit without risk to the engine? Seems it wants to at least get another 200 rpm w/o any issue... Not chasing a number by any means, just curious about when the engine begins to roll over.. Porting heads would seem to add more "headroom" as well..

[XfireZ51]

First of all, this is absurd that I try to reply and end up witha Forbidden 404 message. And not consistently. When is this getting addressed?

Steve,

I set the shift light at 7200 and fuel cutoff at 7400. From the last dyno runs I did several years ago, power peaks at 68-6900rpm. I also roll off timing after 7000rpm and fatten up fuel at that point also.

[jss06c6]

Perfect, thanks Dominic!!

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