Just curious what those of you that have dynoed your cars stock have put down. I just picked up a 04 TL 6-spd for the wife and decided to strap it down just for giggles to see what it would make. First pull it made 225 FWHP / 205 Trq and then kinda fell off each pull a little as it got more and more heat-soaked.

How do the autos compare just out of curiosity?

 

i put down 224 stock..209 torque

 

I have a silly question. Why is it that the manufacturer's HP rating are always higher than what they are Dyno'ed at?

Why does Acura say that the TL has 258 or 256 or whatever it is? when in fact its 225.
I assume this goes for all makes and models of cars. Is it because Dyno results are affected by many things like elevation temperature and are very subtle to change? What exactly do they base manufacturers HP ratings on? are these methods the same across the board like between Acura, Infinity, and Toyota for example?

 

There is an SAE (Society of Automotive Engineers) standard. It was put in place a couple years ago. If not yet, then soon, all mfg publshed HP figures will have to be run to that standard. You will then (if not already inplace) have an apples-to-apples comparision across all models.

Acura uses this SAE standard. The old HP numbers were a good bit higher. For example the TL-S has SAE HP at 286. Same car, same engine under the old measurements would have been 300+ easy.

What you are seeing (and asking about) is the difference between the SAE HP measurement and the Dyno measurement. The SAE standard measures HP at the crank. The Dyno measures at the wheels. The difference between the two is primarily Drive Train loss/inefficiency. The conventional wisdom is that Acura/Honda lose 15% - 17% between the crank and the wheels.

 

Those seem like pretty good numbers compared to mine. I have an AEM intake and my first run (in 3rd gear) yielded 230hp and 202 tq. Second run (in 4th gear) showed 227 hp and 207 tq!

 

mine with intake in 3rd put down 243

 

type-s09, u have 6mt ?

 

Yes, 3rd gear pulls should net a bit more but I believe 4th gear is the closest to 1:1 (in a 6-Spd car) if I am not mistaken so we did all pulls in 4th.

Every dyno is a bit different but generalizing Mustang dynos tend to be the most conservative followed by Dynojets and then the Dynapacks. I have many customers that have dynoed elsewhere and then here on our AWD Dynojet for comparison and made either slightly more or much less.

Its a tuning tool, no more, no less.

 

There is a big difference between what cars are rated at at the flywheel (What power the engine makes) and what it ultimately makes to the tires. There is all that pesky drivetrain losses to factor in. The only other variable is the manufacturers accuracy of the power # to begin with. You have cars like the RX8 that were SEVERELY over rated and then cars like the 03+ Cobras and the new '08 C6 Vettes that can make the rated power AT THE WHEELS.
Jeff

 

My 5AT put down 221 HP and 197 TQ with AEM CAI and Magnaflow exhaust.

 

B/c Acura rates crank hp, what the engine actually produces, and dynos most dynos measure wheel hp, which is what the engine transfers to the wheels.

 

Thanks I will look for the SAE from now on. Great explanations.

How do they measure the HP from the crank? I'm assuming it's much more laborous than just doing a dyno.

 

^^ I don't know the technology. I believe an SAE representitive has to certify the test and setup. I *assume* the crank is connected directly to the drive shaft of the dynomometer.

 

Okay, well thanks for the info guys. I'm sure I could easily look up this info on wikipedia or elsewhere. I'll stop highjacking the thread. Post your Dyno results!

 

That's really good...what was the torque?