VictoryRedZ06

Just curious what the crank or flywheel hp would be? I seen stock ZR1's dyno in the 520 to 540 rwhp range. I dunno it was a load dyno I'm trying to make myself feel better thinking if it was a inertia style dyno I'd put down 560ish to the wheels? LOL What do you guys think?

lilredvette05

I'd normally figure a 12% drive train loss, but that might be even on the low side. Maybe someone will chime in that knows more about an average

VictoryRedZ06

LOL thanks lilredvette05

Mopar Jimmy

12% drivetrain loss is a good conservative number to go with for the C6 Z, and with a 12% loss your making 623.5 crank horsepower (very NICE)!

Wth 13% drivetrain loss (which may be more realistic) your cranking out 630.6 HP at da crank (Sweet)!

VictoryRedZ06

Yeah Buddy thanks Mopar Jimmy your making me feel better already Lol

lilredvette05

No problem I'm just learning a little as I go, but nice numbers

VictoryRedZ06

Me too I just watched a video of a 545 rwhp Z take out a Lambo Aventador...

JesseRohr

My C6Z made 440.8rwhp on a Mustang Dyno and the next day made made 438rwhp on a DynoJet. The car was bone stock right down to the paper air filter.

Weather conditions nearly identical on both days, same altitude, similar humidity, etc...

So with that said, 505 BHP less 13% puts me right in line with both pulls.

ConfusedGarage

I agree with all the input thus far. I am right at 546 rwhp, and I figured that was 615-620ish at the crank.

More importantly is the dyno in my opinion. When I see guys touting numbers from a dyno where a stock Z makes 489, I know its a bs number from a generous dyno. Stock Zs should always dyno 440-450 on a true dyno. The dyno I use puts a stock Z at 446-447 every time. When you see guys put down 515 with a tune and an intake, its on one of the "generous" dynos.

OP - 549 on an accurate dyno is a monster, nice job.

double06

On a stock Z06. I think around 420-425 hp is about as low as I have seen on a good working stock car. Dynos can vary but I think that is as low as I have seen. This would make a loss of max 15%-17%.

My 07 Z

My stock baseline earlier this month at cms on his mustang dyno was 436. That's a 13.6% loss compared to the sticker hp of 505. That's also assuming it actually made 505 at the crank, no more, no less.

I'm making 559 now at the wheels on rynes mustang dyno. Considering taking it to rpm to see what it makes on theirs

VictoryRedZ06

Thanks ConfusedGarage! I totally agree with you about generous dynos, well my builder told me load dynos are best for tuning purposes and give more accurate numbers. Would be nice to see a more inflated number though

VictoryRedZ06

Thanks for sharing JesseRohr!

VictoryRedZ06

Roger that thanks

VictoryRedZ06

Thanks man! I wanna take mine to CMS just to see what it makes over their now too! Lol RPM has a DYNOmite dyno don't know the difference between that and a Mustang Dyno though

Javvy

Can I ask a simple question;

Hypothetically speaking;

If a 500rwhp car lost 12% it would be making
560 hp at the crank, a loss of 60 hp.

If an 800rwhp car lost 12% it would be making 896 at the crank, a
loss of 96hp.

Why is there a difference of 36hp ?

I would have thought the drivetrain for both would have similar losses,
i.e. the horsepower to turn it all would be similar.

Can anyone tell me why you use a percentage please.


Dave.

OJCrush08

ECS dynoed my car on their Dynopak dyno when they finished my tune. This dyno is supposed to be more accurate since power is measured at the hubs, thus removing tire/wheel effects. My power was at 548, and I have always used the more conservative 12% loss which works out to about 622 h/p. I believe that this is much more realistic than the 15% some tuners and owners use. Of course, if I did that, I could brag on 645 h/p, but nit my style.

Also, I am running stock exhaust manifolds/cats with Ti Akros....

DaddyBarlow

In my case, the decreased from crank hp to wheel hp was only about 9% with a lose of about 62hp.

I believe the power loss is more of an offset on H/C NA LS7 engines than only a percentage loss.

'06 Quicksilver Z06

What transmission fluid and differential fluid are you running Daddy?

OJCrush08

FWIW, I did some skulking over in the ZR1 forums and most stock reported dyno figures range from low 530's to low 550's. As we all know the SAE rated h/p is 638.

So, it certainly appears as if more than 12% drivetrain loss figures are being used! For example, 540 h.p at 15% loss gives you 635 h/p.

Opinions?