Plenum & Injector Housing Porting - Page 4 - ZR-1 Net Registry Forums

jss06c6 · 06-29-2018

Slow and steady.. one side of the plenum complete.IMG_20180629_101921711.jpg

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Top Toy · 06-30-2018

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

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jss06c6 · 06-30-2018

Quote:

Originally Posted by Top Toy

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

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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 · 06-30-2018

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

Paul Workman · 06-30-2018

Quote:

Originally Posted by 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

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

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!

jss06c6 · 07-03-2018

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.19219.jpg 19221.jpg

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jss06c6 · 07-10-2018

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 · 07-10-2018

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

jss06c6 · 08-06-2018

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 · 08-06-2018

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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06-29-2018	#31
jss06c6 Join Date: Aug 2015 Location: Magnolia, Texas Posts: 884	Re: Plenum & Injector Housing Porting Slow and steady.. one side of the plenum complete.IMG_20180629_101921711.jpg Sent from my XT1585 using ZR-1 Net Registry mobile app

06-30-2018	#32
Top Toy Join Date: Jul 2012 Location: Allentown, PA Posts: 309	Re: Plenum & Injector Housing Porting 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 __________________ '95 ZR-1, aqua/gray, #167 368 LPE/Haibeck, Web cams, Stainless Works headers, B&B Fusion exhaust, 18" Fikse wheels, Alcon brakes, lowered. 491 SAE RWHP.

06-30-2018	#34
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	Re: Plenum & Injector Housing Porting 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 __________________ 90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold.

07-03-2018	#36
jss06c6 Join Date: Aug 2015 Location: Magnolia, Texas Posts: 884	Re: Plenum & Injector Housing Porting 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.19219.jpg 19221.jpg Sent from my XT1585 using ZR-1 Net Registry mobile app

07-10-2018	#38
Top Toy Join Date: Jul 2012 Location: Allentown, PA Posts: 309	Re: Plenum & Injector Housing Porting Nice job! You're going to really enjoy the end result! __________________ '95 ZR-1, aqua/gray, #167 368 LPE/Haibeck, Web cams, Stainless Works headers, B&B Fusion exhaust, 18" Fikse wheels, Alcon brakes, lowered. 491 SAE RWHP.

08-06-2018	#40
HAWAIIZR-1 Join Date: May 2010 Location: Japan Posts: 3,587	Re: Plenum & Injector Housing Porting 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 __________________ Craig "ZR-1 NO KA 'OI" "ZR-1 ICHIBAN" 1995 #228 Black/Black with Dunn Heads ZR-1 owner since September 2003 ZR-1 Net Registry Founding Member #0074 NCM Lifetime Member #2048