Plenum & Injector Housing Porting - Page 10 - ZR-1 Net Registry Forums

jss06c6 · 10-31-2018

Quote:

Originally Posted by 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

Yes to all. I am running stock FW now. Stainless Works exhaust.. headers through tips. 3" exhaust.

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jss06c6 · 10-31-2018

Quote:

Originally Posted by XfireZ51

Steve,

Is this SAE?

Yes, SAE smoothed..

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Ccmano · 10-31-2018

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

jss06c6 · 10-31-2018

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 · 10-31-2018

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

jss06c6 · 11-14-2018

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 · 11-14-2018

Quote:

Originally Posted by 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!

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 · 11-15-2018

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

jss06c6 · 11-15-2018

Quote:

Originally Posted by Top Toy

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 · 03-13-2019

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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10-31-2018	#93
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	Re: Plenum & Injector Housing Porting 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 __________________ 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.

10-31-2018	#94
jss06c6 Join Date: Aug 2015 Location: Magnolia, Texas Posts: 884	Re: Plenum & Injector Housing Porting 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 . Sent from my XT1585 using ZR-1 Net Registry mobile app

10-31-2018	#95
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,709	Re: Plenum & Injector Housing Porting This was my dyno run w similar mods. I believe I had Magnaflow catback at this point. __________________ [SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX Last edited by XfireZ51; 03-08-2024 at 03:09 PM.

11-15-2018	#98
Top Toy Join Date: Jul 2012 Location: Allentown, PA Posts: 309	Re: Plenum & Injector Housing Porting What happened to your torque? Was 405 ft. lbs. when it was rich? __________________ '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.