don420

What is the real H.P. of the 07 zo6,i know it cant be 505

keagan

A Lot! lol prob 512-525 id say!

WeaponsGradeTorque

505

UTVOL06

I've herd several sources say its underrated...its been stated 512hp from several Z06 owners.

RFC2

It is 512....in Europe (DIN)

Racer X

505 HP + or 1 1-2% The is a very strict procedure for the new HP ratings system. Modern manufacuring tolerences are very tight. The engines are hand assembled to ensure that parts matched better to reduce production variances.

I believe the measured diffenrences on dynos across the country are for the differences in testing conditions, the quality of the measurements used for correction factors, etc, etc.....

A 1-2% variance would allow for an engine up to 515 HP .

Katech_Zach

http://forums.corvetteforum.com/show....php?t=1582356

BLU-BY-U

first off, deriving crank numbers can be a real bloodbath on these forums. What percentage drivetrain loss do you use? that will be a big "discussion" point

my '06 dynoed 453rwhp/423rwtq SAE with 1600 miles on the clock. "If you use" 15% drivetrain loss, you get these crank numbers:

453/.85 = 533 crank hp
423/.85 = 498 crank tq

drivetrain loss factor is in the eye of the beholder

Zred06

According to Katech, the engines are right at 505 hp SAE. I believe them, they are very qualified and specialized in what they do. So either your drivetrain loss factor is wrong or the dyno that tested your car was not accurately measuring the hp.

BLU-BY-U

no, the dyno facility I think is fine. I've seen many, many 427 z's dyno 450 sae in this area. It's just the fact that apparently katech believes the drivetrain loss is in the 10% area:

453/.90 = 503 crank

i guess in the end, the crank # really doesn't matter...it's all about whats getting to the pavement and how you make use of it.

Zred06

A recent test for the LS-7 on a Super Flow 901 dyno at Thompson Racing Engines in Redford, Michigan, generated 546 hp at 6,100 rpm and 514 lb-ft of torque at 4,900 rpm with stock LS7 manifolds but without catalytic converters or stock mufflers and exhaust using the STP factor. That translates to 522 hp and 492 lb-ft using the SAE factor. By adding the catalytic converter and exhaust would reduce input by roughly 10-15 hp which would mean that it was putting out 512-507 hp. The problem is that in the past engine horsepowers were rarely quoted in terms of SAE so everyone always thought that their engine was putting out a lot more hp. As you can see, this has nothing to do with drivetrain losses.

jfreez

Does anyone know if the new 600hp viper is measured by the SAE standard?

For that matter, what about the curent viper or the GT500.

Dr.Ron

I agree.
Crank HP is just a sales point for the public.

Ron

0David_Yu

Hmm. Well judging by the variance on different rolling roads, I would disagree; it it RWHP that is hard to measure accurately!

The biggest factor is apparently wheels and tyres; a few psi here, a heavier/lighter wheel there. It all makes a big difference.

The only legitimate use of a rolling road is to compare before and after figures ON THE SAME ROLLING ROAD in identical conditions.
The absolute figures should all be taken with a very large pinch of salt; the only way to accurately measure your engine's actual power output is to take it out of the car and put it on a proper dynamometer.

FYI, the Dyno Dynamics RR I used here in England measured my Z06 at just 409rwhp but their conversion factor figured that at 499bhp at the flywheel which sounds plausible on a 2000 mile engine.
I only bothered to figure it because I wanted a baseline number with which to compare the LPE kit I have just had fitted. (New number soon)

For all those who believe that all Z06s produce 530-550bhp; why would Chevy deliberately downplay hp on their flagship performance car? Too many sales?

BLU-BY-U

right on, Ron.

although I do post what my cars have dynoed in the past on the vette forum, I take alot more pride from posting about my track experiences...and reading about others. dynos are a sideshow at best. these stock ls7s are going to be within fractions of each other powerwise anyways

Katech_Zach

I never said that. In my other thread I posted the numbers we measured on a Mustang dyno.

bernrex

Earlier Katech data suggests drivetrain loss on C6Z is in neighborhood of 11%.

Katech_Zach

I never said that either. In the other thread I said 16.6-16.9% on a Mustang dyno.

BLU-BY-U

well, I guess I'm backing into the 10-11% by the fact I dynoed on a 248c dynojet. You claim from your testing 505 is correct crank hp (i hope i read that right - lol). So, we're back to that viscous cycle of what is the loss factor (sounds like 10% for a dynojet and 17% for a mustang dyno).

trumper Z06

I think what we have learned is:

1. Tuner's dyno's.... that measure rear wheel horsepower have many variables...

2. Katech "Lab Grade" test equipment, measuring engine horsepower at the crank, under controled conditions, using an acredited operator, verify that GM is providing LS7 engines that meet the SAE standards.

Katech's data base of 77 LS7 engines (maybe more), ALL measuring 505 hp., plus or minus the SAE allowables, shows the engines are producing the power GM is advertising.