First ZL1 1/4 Mile Numbers.... (best of 12.04) - Page 3 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

2012ZL1 · 04-13-2012, 12:35 PM

How many miles are on the car? Could be some computer hold backs till more miles?

acrbill · 04-13-2012, 12:36 PM

Quote:

Originally Posted by 2012ZL1

How many miles are on the car? Could be some computer hold backs till more miles?

Did you see those impressive dyno numbers? I don't think its holding anything back power wise.

newagemuscle · 04-13-2012, 12:36 PM

those dyno number dont seem right for a stock ZL1.

Hennessey Performance · 04-13-2012, 12:37 PM

Hey guys, the numbers are the numbers. We know how to dyno and test cars down the track and have gone thru this drill a lot in the past 20 years. I even thought that maybe we had some bad fuel but our tuner said that he never saw any knock on the dyno. I am guessing that the power will come up once the motor is broken in. I would expect more like 485 rwhp from a stock ZL1 automatic car.

116 mph was with some heat soak. I would expect to see closer to 120 mph on a cooler day and no heat soak.

I will be interested to see what others are able to get. So far these are the numbers we are seeing from a bone stock automatic ZL1.

FYI, the car has less than 200 miles on it. We usually see a gain of 15 rwhp from LSA motors once they get past 1500 miles.

PQ · 04-13-2012, 12:37 PM

Quote:

Originally Posted by Brent Hinds

Doesn't the 2.0 60ft indicate the track conditions were ok? If it were a 2.2 or 2.3 I would immediately be a skeptic.

Especially the 1.8 time. I figured some DRs would be high 11s.

BUT, it's with 20 inch wheels and DRs. Plus it's just a few times. Might be getting better with the launch.

Hennessey Performance · 04-13-2012, 12:38 PM

Quote:

Originally Posted by PQ

Especially the 1.8 time. I figured some DRs would be high 11s.

BUT, it's with 20 inch wheels and DRs. Plus it's just a few times. Might be getting better with the launch.

We ran the car aggressively but probably not on "full kill" as this is a customer's car. I am sure that a pair of MT drag radials would be even quicker.

hognutz · 04-13-2012, 12:39 PM

some thing has to be wrong with this info.

how does a car with SAE580 hp dyno with 567whp.

I think more will come to light. wold like to see another car run same day to see how that track is running.

Interenet racer's forget some track days are on the slow side for various reasons.

the 60' is not that bad though so baring some kind of issue with the car or just being an off day for that track this is a letdown to some extent. I have always been nervous that the car was too heavy but it should throw down the same times as a CTS-v does.

PQ · 04-13-2012, 12:39 PM

Quote:

Originally Posted by Hennessey Performance

I would expect more like 585 rwhp from a stock ZL1 automatic car.

What?

Those numbers seem HIGH, not low.

Stock is 580 at the crank.

newagemuscle · 04-13-2012, 12:40 PM

Quote:

Originally Posted by Hennessey Performance

Hey guys, the numbers are the numbers. We know how to dyno and test cars down the track and have gone thru this drill a lot in the past 20 years. I even thought that maybe we had some bad fuel but our tuner said that he never saw any knock on the dyno. I am guessing that the power will come up once the motor is broken in. I would expect more like 585 rwhp from a stock ZL1 automatic car.

116 mph was with some heat soak. I would expect to see closer to 120 mph on a cooler day and no heat soak.

I will be interested to see what others are able to get. So far these are the numbers we are seeing from a bone stock automatic ZL1.

FYI, the car has less than 200 miles on it. We usually see a gain of 15 rwhp from LSA motors once they get past 1500 miles.

I just don't see how you can say you would expect 585... are you calculating what you feel the drive train loss would be? As I stated in my last post... we just did a cts-v (auto) last week on a mustang dyno which tend to pull lower numbers and he did 461 with a tune and CAI. A dyno jet should not be 100 rwhp higher.

Russell James · 04-13-2012, 12:40 PM

That sounds about right - mid 12s bone stock in good weather, very low 12's with traction.

I don't see how so many think this is going to be an 11 sec car bone stock. Check the weight. That will take more boost and traction.

Stick times with a mediocre driver will really get ugly on stock tires.

PQ · 04-13-2012, 12:41 PM

Quote:

Originally Posted by Russell James

That sounds about right - mid 12s bone stock in good weather, very low 12's with traction.

I don't see how so many think this is going to be an 11 sec car bone stock. Check the weight. That will take more boost and traction.

Stick times with a mediocre driver will really get ugly on stock tires.

Agreed. I just figure with some good DRs on an 18" wheel set-up it could hit the very high 11s.

KMPrenger · 04-13-2012, 12:41 PM

Quote:

Originally Posted by Hennessey Performance

I would expect more like 585 rwhp from a stock ZL1 automatic car...

...you mean more like 500rwhp?

ULTRAZLS1 · 04-13-2012, 12:42 PM

If this car really had 560rwhp it would trap a hell of a lot higher than ~116. Must have something to do with the trans ratios etc messing with the dyno. Not sure...but no way it is running like 560rwhp.

*mlee* · 04-13-2012, 12:42 PM

Quote:

Originally Posted by PQ

What?

Those numbers seem HIGH, not low.

Stock is 580 at the crank.

Not sure how RWHP can be more than Crank HP

Quote:

Originally Posted by KMPrenger

...you mean more like 500rwhp?

04-13-2012, 12:35 PM	#29
2012ZL1 CaRaHoLiC Drives: '12 ZL1,67 Cam,68 Biscayne 427 4 sp Join Date: Aug 2011 Location: B.C. Canada Posts: 1,701	How many miles are on the car? Could be some computer hold backs till more miles? __________________ 2012 ZL1 2.55 upper, 10" lower pullies, Innovators west billet hub and sfi balancer, solid blower drive isolator, 50 mm idler kit, full length S/S headers no cats, comp cams custom grind cam, comp roller rocker trunion kit, comp push rods,dual valve springs retainers and locks, Injector dynamics ID850 inectors, Rotofab ZL1 cold air kit, Lingenfelter 160 thermostat, Rotofab intercooler reservoir, stock plugs, LS7 90mm throttle body, GTO clutch reservoir mod, my own custom catch can, Tuning by Jannetty, install by me.

04-13-2012, 12:36 PM	#31
newagemuscle Philippians 4:13 Drives: SLP Supercharged LS3 Join Date: Aug 2009 Location: The Motor City - Michigan Posts: 2,902 View My Garage	those dyno number dont seem right for a stock ZL1. __________________

04-13-2012, 12:39 PM	#35
hognutz Drives: 2013 ZL1 Join Date: Oct 2011 Location: tangent or Posts: 2,984	some thing has to be wrong with this info. how does a car with SAE580 hp dyno with 567whp. I think more will come to light. wold like to see another car run same day to see how that track is running. Interenet racer's forget some track days are on the slow side for various reasons. the 60' is not that bad though so baring some kind of issue with the car or just being an off day for that track this is a letdown to some extent. I have always been nervous that the car was too heavy but it should throw down the same times as a CTS-v does. __________________ shopping for 2017+1le or zl1 2009 CTS-V -sold 2015 Hellcat-sold 2013 ZL1 -sold 2007 Z06- sold 2014 Chrysler 300 2011 Duramax 8" lift, deleted tuned

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04-13-2012, 12:37 PM	#32
Hennessey Performance Drives: THE EXORCIST Join Date: May 2009 Location: Sealy, TX Posts: 388	Hey guys, the numbers are the numbers. We know how to dyno and test cars down the track and have gone thru this drill a lot in the past 20 years. I even thought that maybe we had some bad fuel but our tuner said that he never saw any knock on the dyno. I am guessing that the power will come up once the motor is broken in. I would expect more like 485 rwhp from a stock ZL1 automatic car. 116 mph was with some heat soak. I would expect to see closer to 120 mph on a cooler day and no heat soak. I will be interested to see what others are able to get. So far these are the numbers we are seeing from a bone stock automatic ZL1. FYI, the car has less than 200 miles on it. We usually see a gain of 15 rwhp from LSA motors once they get past 1500 miles.

04-13-2012, 12:40 PM	#38
Russell James Drives: '15 SS 1LE, '69 Z28 drag car Join Date: Dec 2009 Location: Mich Posts: 4,483	That sounds about right - mid 12s bone stock in good weather, very low 12's with traction. I don't see how so many think this is going to be an 11 sec car bone stock. Check the weight. That will take more boost and traction. Stick times with a mediocre driver will really get ugly on stock tires.

04-13-2012, 12:42 PM	#41
ULTRAZLS1 Drives: 14 Silverado LTZ Z71, 16 Camaro SS Join Date: Nov 2009 Location: Jackson, Michigan Posts: 4,407	If this car really had 560rwhp it would trap a hell of a lot higher than ~116. Must have something to do with the trans ratios etc messing with the dyno. Not sure...but no way it is running like 560rwhp.