Stock dyno ZL1

[Bob Cosby]

So....if several owners of the 2013 GT500 end up having dyno numbers that are ~600 RWHP, will we then all say that its SAE certified HP rating is also low, and thus Ford underrated it too - SAE certification be damned?

[toehead93]

Bob, it is of no use. Spare your fingers the hard work. There is only like a dozen of us in this whole site who understand. Sometimes I think everyone should have to take some type of performace IQ test before they're allowed to start posting.

[Betiwin]

So the 2010-2012 GT500's have been puttin down 485-510 rwhp stock for 3 years and they are rated at 540-550 hp not SAE. Wouldn't you think a 580 hp car would put down 500-520rwhp? Guys its 580hp why spend all the time and money to comply with SAE standards and then lie about the numbers. So should we go around and tell people that all the older GT500's are really 580-600 hp cars too cause they make similar power. Those that say the trap speed tells all are correct. 116 mph is not 600+ hp. Hell my wife's 4 door sedan traps 112 mph and makes 400 rwhp.

[jleews6]

Give it some time and then take what they average at the track (MPH) and that will give you a better idea of the power they make.

My 03 Cobra made 426rwhp and went 121 in the heat @almost 3700#. So if Dynos are correct then all these ZL!s that are making over 510 should be going about 125?

Dynos are cool and they have there purpose but I don't think they are accurate as far as giving numbers.

[Drake Heminger]

Originally Posted by SlingShot

This is just a thought on the SAE Certification, I've been reading on the subject for quit a while now. Everything I've read on the subject that I could find states, the whole point of it is so manufactures can't fudge their numbers higher than what they actually are. Nowhere have I read anything, that said the numbers couldn't actually be lower. It seems the number tested at and advertised is basically just a minimum, that seems to be + or - a certain percentage. I've seen nothing that would stop a manufacture from advertising an under rated horde power.

Just my thought for the day, while drinking my first cup of JOE while waiting on my order to get here.

+1!

[drobbins2]

Anyone thinking the zl1 is underrated 30+ horsepower at the crank needs to lay off taking the blue pill. The car has electronic steering assist and im sure plenty of other small enhancements to get more power to the wheels. You're absolutely dreaming at even 15% drivetrain loss. Lol. I'd bet 13% tops.

Also dyno numbers are about as reliable as a wet paper bag.

[radz28]

Originally Posted by drobbins2

Anyone thinking the zl1 is underrated 30+ horsepower at the crank needs to lay off taking the blue pill. The car has electronic steering assist and im sure plenty of over small enhancements to get more power to the wheels. You're absolutely dreaming at even 15% drivetrain loss. Lol. I'd bet 13% tops.

Also dyno numbers are about as reliable as a wet paper bag.

While the EPS will free-up more power, how about the 9.9" ring gear; the heavier-beefier tranny and rear; larger axles; etc? Will that EPS make up for all that? It's also been posted more robust axle bearings have been added, and it's not often when more robust means less weight and greater efficiency...

You are no more correct in ZL1 making less power than those claiming it does until you can put LSA on a dyno', test it, and then do corresponding scientific chassis testing to back your claims...

[KKreme15]

Originally Posted by radz28

While the EPS will free-up more power, how about the 9.9" ring gear; the heavier-beefier tranny and rear; larger axles; etc? Will that EPS make up for all that? It's also been posted more robust axle bearings have been added, and it's not often when more robust means less weight and greater efficiency...

You are no more correct in ZL1 making less power than those claiming it does until you can put LSA on a dyno', test it, and then do corresponding scientific chassis testing to back your claims...

Do you think the ZL1 is underrated 30 HP at the crank?
I really hope not.

THE MILK HAS GONE BAD

[Rice Killer]

Originally Posted by drobbins2

Anyone thinking the zl1 is underrated 30+ horsepower at the crank needs to lay off taking the blue pill. The car has electronic steering assist and im sure plenty of other small enhancements to get more power to the wheels. You're absolutely dreaming at even 15% drivetrain loss. Lol. I'd bet 13% tops.

Also dyno numbers are about as reliable as a wet paper bag.

Viagra

[KKreme15]

Originally Posted by radz28

While the EPS will free-up more power, how about the 9.9" ring gear; the heavier-beefier tranny and rear; larger axles; etc? Will that EPS make up for all that? It's also been posted more robust axle bearings have been added, and it's not often when more robust means less weight and greater efficiency...

You are no more correct in ZL1 making less power than those claiming it does until you can put LSA on a dyno', test it, and then do corresponding scientific chassis testing to back your claims...

No but he is more correct because he is siding with SAE certified numbers from the manufacturer... Like a reasonable human being

[drobbins2]

Originally Posted by radz28

While the EPS will free-up more power, how about the 9.9" ring gear; the heavier-beefier tranny and rear; larger axles; etc? Will that EPS make up for all that? It's also been posted more robust axle bearings have been added, and it's not often when more robust means less weight and greater efficiency...

You are no more correct in ZL1 making less power than those claiming it does until you can put LSA on a dyno', test it, and then do corresponding scientific chassis testing to back your claims...

But to assume that it's making more HP at the crank with all the R&D put into the vehicle to get more power to the ground is a hopeful foolish theory. It was a focus point was it not?

Regardless of the crank being that much higher (unlikely) or closer to what GM certified the vehicle at (very likely) is win win for the ZL1 since it's putting that power to the ground regardless. And we've already seen some of these cars dyno in the 470 range. So like I said before...

dyno numbers are about as reliable as a wet paper bag

[drobbins2]

Originally Posted by Rice Killer

Viagra

lol

https://en.wikipedia.org/wiki/Redpill

[radz28]

Originally Posted by KKreme15

Do you think the ZL1 is underrated 30 HP at the crank?
I really hope not.

THE MILK HAS GONE BAD

When I see a factory-dressed LSA on an engine dyno' with all accessories, then I can have more confidence. I find a very wide spread of dynos' out there, and maybe after a few months, I might feel better about passing judgment, but it's hard to argue what ZR1 is putting out and compare some numbers that are being reported.

Originally Posted by KKreme15

No but he is more correct because he is siding with SAE certified numbers from the manufacturer... Like a reasonable human being

Considering I found SAE documents in our Wiki from the '10 LLT (http://www.camaro5.com/forums/wiki.p...pecifications&), which GM admitted was "underrated" and changed to 312 in '11, I'd say there might be a possibility of, perhaps, something similar here. That's not to say that I necessarily believe it, however, it does leave a little doubt.

[KKreme15]

Originally Posted by radz28

When I see a factory-dressed LSA on an engine dyno' with all accessories, then I can have more confidence. I find a very wide spread of dynos' out there, and maybe after a few months, I might feel better about passing judgment, but it's hard to argue what ZR1 is putting out and compare some numbers that are being reported.



Considering I found SAE documents in our Wiki from the '10 LLT (http://www.camaro5.com/forums/wiki.p...pecifications&), which GM admitted was "underrated" and changed to 312 in '11, I'd say there might be a possibility of, perhaps, something similar here. That's not to say that I necessarily believe it, however, it does leave a little doubt.

The LLT was revised up 8 HP. Numbers can be off 1-2%. 8 is 2.5% of 312. To say they underrated the engine 30 HP when you have just as many dynoing in the 470 range as you do around 515 is ludicrous.