ZR1 HP overrated?

**slow4dr** · 10-07-2008, 11:25 PM

You be the judge.....

*taken from LS1tech

"graph of before and after..small spike makes it read a little higher then I posted above"

Stock vs Tuned

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**DJ2** · 10-07-2008, 11:31 PM

this car must have been tuned by bubbles...

**el_jefe** · 10-07-2008, 11:36 PM

what is it rated at again?

**slow4dr** · 10-07-2008, 11:41 PM

Quote:

Originally Posted by el_jefe

what is it rated at again?

I believe the latest numbers were 635

**RedBull** · 10-07-2008, 11:44 PM

Maybe this one had an auto trans.

**el_jefe** · 10-07-2008, 11:49 PM

IMHO, unless you have a windtunnel dyno, your numbers are going to be low. Engine management is much more fluid than it used to be, and if the ZR1 is lifting heads (heh) then it's going to pull timing/add fuel to bring down temps at high load/low airflow conditions. Dinan (the BMW tuner) showed something like a 75hp difference based on airflow alone in one test, which is why they invested in a windtunnel dyno.

But it's still interesting.

**BTR** · 10-08-2008, 08:32 AM

I'd rather have (and can only afford) a Z06

**slow4dr** · 10-08-2008, 10:45 AM

Quote:

Originally Posted by el_jefe

IMHO, unless you have a windtunnel dyno, your numbers are going to be low. Engine management is much more fluid than it used to be, and if the ZR1 is lifting heads (heh) then it's going to pull timing/add fuel to bring down temps at high load/low airflow conditions. Dinan (the BMW tuner) showed something like a 75hp difference based on airflow alone in one test, which is why they invested in a windtunnel dyno.

But it's still interesting.

While I agree I was somewhat surprised by this.......

FYI:

"The car was off the charts rich with the stock calibration. Suprisingly timing was around 25deg tapering off to 23deg with a coolant temp of 190, IAT at 75. 10psi boost. I was expecting the car to have very low timing from the factory.

I ended up setting the air/fuel ratio at 11.5-11.6 and did not modify the main timing table. I did slightly modify the power enrichment vs timing table. No hint of knock and the factory IAT vs timing table remains stock.

The car was allowed to cool off between runs but was brought back up to 190 deg coolant temp for each run in an effort to maintain consistency. (there was no super cool-down money shot)"

10-07-2008, 11:25 PM	#1 (permalink)
slow4dr SOT Moderator Join Date: Nov 2006 Location: SoCal Posts: 9,690	ZR1 HP overrated? You be the judge..... *taken from LS1tech "graph of before and after..small spike makes it read a little higher then I posted above" Stock vs Tuned [/ __________________

10-07-2008, 11:31 PM	#2 (permalink)
DJ2 SOT Moderator Join Date: Jun 2006 Location: in a house Posts: 14,634	this car must have been tuned by bubbles... __________________

10-07-2008, 11:36 PM	#3 (permalink)
el_jefe SOT Post Whore Join Date: Jun 2006 Location: BFE Arizona Posts: 12,079 gXboxLive Leaderboard: 20^th	what is it rated at again? __________________

10-07-2008, 11:49 PM	#6 (permalink)
el_jefe SOT Post Whore Join Date: Jun 2006 Location: BFE Arizona Posts: 12,079 gXboxLive Leaderboard: 20^th	IMHO, unless you have a windtunnel dyno, your numbers are going to be low. Engine management is much more fluid than it used to be, and if the ZR1 is lifting heads (heh) then it's going to pull timing/add fuel to bring down temps at high load/low airflow conditions. Dinan (the BMW tuner) showed something like a 75hp difference based on airflow alone in one test, which is why they invested in a windtunnel dyno. But it's still interesting. __________________

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10-07-2008, 11:44 PM	#5 (permalink)
RedBull SOT Senior Member Join Date: Jun 2006 Location: IL Posts: 1,875 gXboxLive Leaderboard: 58^th	Maybe this one had an auto trans.

10-08-2008, 08:32 AM	#7 (permalink)
BTR SOT Senior Member Join Date: Nov 2007 Posts: 1,413	I'd rather have (and can only afford) a Z06