Dyno today - 91 Z - ZR-1 Net Registry Forums

VetteMed · 09-28-2009

Lucky me, there's a speed shop 4 miles from home, with a dyno!=D> And for the summer, they're offering 2 pulls for $40. So, now that my fuel pumps are behaving, I drove on over.

The guys running the dyno were fairly knowledgeable about the ZR-1 and LT5, which I was surprised about.

I stood behind the car during the runs, in order to experience the sound of the LT5 through the Corsas at 7000 rpm. I'm glad I did - it was music like I've never heard before, at least not on a car I've actually owned. I've got a video clip I'm uploading, I'll post when it's done.

Anyhow, I'll cut to the chase. 368 rwhp, 350 ft-lbs torque. The HP curve is nearly flat from 5700 rpm all the way to 7000. Conditions: Temp 93F, Humidity 33%.

As I suspected, my tach is WAYYY off, the dyno operator said that when the dyno computer indicated 4500 rpm, the tach on the dash was over 6K. At 7K actual, the tach was maxed out. Guess it's time to do something about that...

THere was quite a bit of black smoke blown out on the first run (also blew out the sniffer probe!). The second run looked "cleaner" but with nearly identical results (within 0.05 HP). A/F ratio was around 12.2 to 12.4 for most of the run, so there's probably some HP to be gained there.

Oh, my mods -- longtube headers (not sure which brand, PO installed em), no cats, and Corsa resonator/mufflers. Open airbox. Z-Industries PROM.

So, I'm happy with the HP, and happy that I got to hear my LT5 singing. Of course, now I want my top end ported...

Here's the video of the first run:

-Andrew

Kb7tif · 09-28-2009

Cool

Good think that car is anchored down good.

secondchance · 09-28-2009

Cool!
Marc Haibeck said there were about 20 horses with headers and cat back. So it all adds up.

VetteMed · 09-28-2009

Yeah, I guess it adds up based on the mods in place...
Dyno chart:

Jim Nolan · 09-29-2009

I also have a Corsa, SW headers, no cats and a ported top end and mine peaked 397 hp at 5500 rpm and fell off to 394 hp at 7000 rpm. Heads up porting will add another 30 hp and you will be able to tell the difference. I also added 3.91:1 gears.

09-28-2009	#1
VetteMed Join Date: Mar 2009 Location: Orlando, FL Posts: 1,828	Dyno today - 91 Z Lucky me, there's a speed shop 4 miles from home, with a dyno!=D> And for the summer, they're offering 2 pulls for $40. So, now that my fuel pumps are behaving, I drove on over. The guys running the dyno were fairly knowledgeable about the ZR-1 and LT5, which I was surprised about. I stood behind the car during the runs, in order to experience the sound of the LT5 through the Corsas at 7000 rpm. I'm glad I did - it was music like I've never heard before, at least not on a car I've actually owned. I've got a video clip I'm uploading, I'll post when it's done. Anyhow, I'll cut to the chase. 368 rwhp, 350 ft-lbs torque. The HP curve is nearly flat from 5700 rpm all the way to 7000. Conditions: Temp 93F, Humidity 33%. As I suspected, my tach is WAYYY off, the dyno operator said that when the dyno computer indicated 4500 rpm, the tach on the dash was over 6K. At 7K actual, the tach was maxed out. Guess it's time to do something about that... THere was quite a bit of black smoke blown out on the first run (also blew out the sniffer probe!). The second run looked "cleaner" but with nearly identical results (within 0.05 HP). A/F ratio was around 12.2 to 12.4 for most of the run, so there's probably some HP to be gained there. Oh, my mods -- longtube headers (not sure which brand, PO installed em), no cats, and Corsa resonator/mufflers. Open airbox. Z-Industries PROM. So, I'm happy with the HP, and happy that I got to hear my LT5 singing. Of course, now I want my top end ported... Here's the video of the first run: -Andrew Last edited by VetteMed; 09-28-2009 at 06:48 PM.

09-28-2009	#2
Kb7tif Join Date: May 2009 Location: S Nevada Posts: 352	Re: Dyno today - 91 Z Cool Good think that car is anchored down good. __________________ 1995 Convertible Supercharged Auto 1974 454 550hp (avatar car) On the blocks- -Scharger install ! 1992-Zr-1 Sold. Watson Headers Ported Plenum, Housings Random tech cats Fidanza Flywheel Chipped, Relocated Mat Woods 165 stat Borlas, Straights 1996 Lt4 Sold 1994 Lt1 Sold 2004 Z06 Sold AKA** Illenema Last edited by Kb7tif; 09-29-2009 at 05:47 PM.

09-28-2009	#3
secondchance Join Date: Aug 2006 Location: McLean, VA Posts: 3,721	Re: Dyno today - 91 Z Cool! Marc Haibeck said there were about 20 horses with headers and cat back. So it all adds up.

09-28-2009	#4
VetteMed Join Date: Mar 2009 Location: Orlando, FL Posts: 1,828	Re: Dyno today - 91 Z Yeah, I guess it adds up based on the mods in place... Dyno chart:

09-29-2009	#5
Jim Nolan Join Date: Jan 2007 Location: Florida Posts: 241	Re: Dyno today - 91 Z I also have a Corsa, SW headers, no cats and a ported top end and mine peaked 397 hp at 5500 rpm and fell off to 394 hp at 7000 rpm. Heads up porting will add another 30 hp and you will be able to tell the difference. I also added 3.91:1 gears.