Rear wheel HP estimate - ZR-1 Net Registry Forums

Nacho_ZR1 · 02-27-2013

Greetings from Moscow! Quick question - realistically how much rwhp can I expect with ported heads/IH and Pete's cams. Also, what trap speeds and mph are ya'll running in the 1/4? Once i get back from my biz trip, I'll be taking my car to Corey so he can work his magic!

LGAFF · 02-27-2013

420-440rwhp; traps at 120-125, depending on how good a driver you are and tires you use

Hib Halverson · 02-27-2013

The Automasters "Street Skinner" engine in my 95 made 413 SAE-corrected at the wheels on a DynoJet with stock manifolds and cats.

If you add headers and cams to a 350 with head/housings/plenum work and cams I'd hope for at least 430 at the wheels. Anything less and I'd want my money back.

I'd say your speed in the quarter will be 120-130. As for the e.t? That will depend on your driving talent, axle ratio, rear tires and your suspension set-up.

Fully Vetted · 02-28-2013

I've got right at 420 to the wheels without cams. Pete did the port work and the SW headers. Have not been to a track.

Hib Halverson · 02-28-2013

420 at the wheels..SAE-corrected or standard-corrected?

Fully Vetted · 03-01-2013

Good question. Corey did the pull last month. I'll be picking the car up here pretty quick. I'll ask.

Pete · 03-01-2013

When i dyno'd that Z it made 425 SAE Corrected

I heard Corey got 428 out of it.

I think 430+ should be possible from that Z but then again every Dyno is different 420-430 is withen tolerance
Some shops have unfriendly dyno #'s till you drop some cash then they get you some friendly dyno #'s.

This is why i always dyno'd at two different Dyno's just to compare.
Look up Dynojet tricks how they can play with Dyno #'s

What i have discovered at my 600ft elavation track and my Z with stock front wheel/tires.
370-380rwhp 115-117 1/4 MPH
390-410rwhp 117-119 1/4 MPH
415-430rwhp 119-121 1/4 MPH
435-450rwhp 121-123 1/4 MPH
465-475rwhp 128-129 1/4 MPH aluminum pullies half weight over stock saves 2.5lbs,ATI balancer minus 2lbs,flywheel/clutch set up saved a bunch
(200lbs overall total)

Pete

XfireZ51 · 03-01-2013

Pete,

You've got the last 25 rwhp making a 5+ MPH trap speed?

Pete · 03-01-2013

Quote:

Originally Posted by XfireZ51

Pete,

You've got the last 25 rwhp making a 5+ MPH trap speed?

Since then i re-ported my plenum/IH's a bit bigger i also mention i reduced rotational weight between pullies,ATI balancer,clutch/flywheel i'd say 25lbs maybe more and about 200lbs dead weight.

Pete

Nacho_ZR1 · 03-01-2013

Quote:

Originally Posted by Pete

Since then i re-ported my plenum/IH's a bit bigger i also mention i reduced rotational weight between pullies,ATI balancer,clutch/flywheel i'd say 25lbs maybe more and about 200lbs dead weight.

Pete

Wow how'd you reduce 200lbs? Inquiring minds wanna know

02-27-2013	#1
Nacho_ZR1 Join Date: Nov 2010 Location: Cedar Hill, Texas Posts: 154	Rear wheel HP estimate Greetings from Moscow! Quick question - realistically how much rwhp can I expect with ported heads/IH and Pete's cams. Also, what trap speeds and mph are ya'll running in the 1/4? Once i get back from my biz trip, I'll be taking my car to Corey so he can work his magic! __________________ [B][U]---SOLD BUT NOT FORGOTTEN---[/U][/B] [SIZE="1"][SIZE="2"]1992 ZR-1 #483 [COLOR="DarkRed"]Dark Red Metallic[/COLOR] [U][B]Mods[/B][/U] -Jeal headers -Stock exhaust with X-pipe -4.30 Gears -Corey Henderson tune -375 RWHP[/SIZE][/SIZE]

02-27-2013	#2
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,194	Re: Rear wheel HP estimate 420-440rwhp; traps at 120-125, depending on how good a driver you are and tires you use __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

02-27-2013	#3
Hib Halverson Join Date: Jun 2005 Location: CenCoast California Posts: 899	Re: Rear wheel HP estimate The Automasters "Street Skinner" engine in my 95 made 413 SAE-corrected at the wheels on a DynoJet with stock manifolds and cats. If you add headers and cams to a 350 with head/housings/plenum work and cams I'd hope for at least 430 at the wheels. Anything less and I'd want my money back. I'd say your speed in the quarter will be 120-130. As for the e.t? That will depend on your driving talent, axle ratio, rear tires and your suspension set-up. __________________ Hib Halverson Technical Writer former owner 95 VIN 0140 current owner 19 VIN 1878

02-28-2013	#4
Fully Vetted Join Date: Sep 2012 Location: Rockwall, Tx Posts: 1,510	Re: Rear wheel HP estimate I've got right at 420 to the wheels without cams. Pete did the port work and the SW headers. Have not been to a track. __________________ _________________ 1994 AB/Grey #141 430 RWHP/392 RWTQ FBI Lyposuction / Secondaries relieved of duty / SW Long Tube Headers / Corsa Exhaust / FIC SS Injectors / MSD Coils / Lightweight Pulleys / Corey tuned B & M Shifter / Aluminum Flywheel / Samco Hoses / Shelby Series One's / C4 No Flex Frame Stiffener BBC - Bling By Carter: Custom ZR-1 Center Caps / Custom Plenum Plate / Air Box Knobs / TB Cover / Oil Filter Cover

02-28-2013	#5
Hib Halverson Join Date: Jun 2005 Location: CenCoast California Posts: 899	Re: Rear wheel HP estimate 420 at the wheels..SAE-corrected or standard-corrected? __________________ Hib Halverson Technical Writer former owner 95 VIN 0140 current owner 19 VIN 1878

03-01-2013	#6
Fully Vetted Join Date: Sep 2012 Location: Rockwall, Tx Posts: 1,510	Re: Rear wheel HP estimate Good question. Corey did the pull last month. I'll be picking the car up here pretty quick. I'll ask. __________________ _________________ 1994 AB/Grey #141 430 RWHP/392 RWTQ FBI Lyposuction / Secondaries relieved of duty / SW Long Tube Headers / Corsa Exhaust / FIC SS Injectors / MSD Coils / Lightweight Pulleys / Corey tuned B & M Shifter / Aluminum Flywheel / Samco Hoses / Shelby Series One's / C4 No Flex Frame Stiffener BBC - Bling By Carter: Custom ZR-1 Center Caps / Custom Plenum Plate / Air Box Knobs / TB Cover / Oil Filter Cover

03-01-2013	#7
Pete Join Date: Dec 2003 Location: Chicagoland,IL Posts: 2,679	Re: Rear wheel HP estimate When i dyno'd that Z it made 425 SAE Corrected I heard Corey got 428 out of it. I think 430+ should be possible from that Z but then again every Dyno is different 420-430 is withen tolerance Some shops have unfriendly dyno #'s till you drop some cash then they get you some friendly dyno #'s. This is why i always dyno'd at two different Dyno's just to compare. Look up Dynojet tricks how they can play with Dyno #'s What i have discovered at my 600ft elavation track and my Z with stock front wheel/tires. 370-380rwhp 115-117 1/4 MPH 390-410rwhp 117-119 1/4 MPH 415-430rwhp 119-121 1/4 MPH 435-450rwhp 121-123 1/4 MPH 465-475rwhp 128-129 1/4 MPH aluminum pullies half weight over stock saves 2.5lbs,ATI balancer minus 2lbs,flywheel/clutch set up saved a bunch (200lbs overall total) Pete __________________ '91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage Last edited by Pete; 03-01-2013 at 02:20 AM.

03-01-2013	#8
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,708	Re: Rear wheel HP estimate Pete, You've got the last 25 rwhp making a 5+ MPH trap speed? __________________ [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