Totally disappointed with my dyno today. Apexi N1 dual canisters on straight pipe+AEM Intake=dyno came out 246whp.

 

I wonder how much my car would make...havent really dynoed it yet

 

You do understand that 286 is the rated CRANK HP. You loose 15% or so in "drivetrain loss" when you measure at the wheels.

Makes since to me...
It's a known fact the TL exhaust is very free flowing and doesn't benefit much from opening it up, TL-S even more so as it's "14%" more free flowing than the TL.

Assuming 10 crank hp max gain from the AEM and NONE for the exhaust work... = 296 - (296 x .15) = 251

251 is damn close to 246. Atmospheric condition can make up that difference easy.

 

was your tl ab auto or stick/??

 

was your tl an auto or stick/??

 

1

 

stick......well i don't know if 'full tank VS almost empty gas' makes any difference, 'cause mine was almost empty. in addition, i drove 35 miles to get to the shop.

 

is urs a type-S???

 

does auto or stick make any differences on the dyno?

 

yes. auto drivetrain assumes more power loss than manual tranny. I believe it's due to the torque converter in the auto.

 

Yes the parasitic loss in the auto tranny is greater than the 15% average difference in the manual setup.

How much gas in the tank has nothing to do with the outcome unless you are almost out of gas and leaning out.

Was the car cooled off before the start of the first pull?

How many pulls did you make?

Did the dyno operator have a fan blowing at the radiator/grille during the pull?

The engine oil temp should be up to operating temp and the coolant should be as well. I have dyno'd and tuned on the dyno several high RWHP cars and the best results come from having a cool intake charge and warmed up bottom end. Too cold and you will lose some power due to ring seal and too hot and heat soak will zap some power as well. It's not just a cut and dried thing.

BTW, what type of dyno? Mustang Dyno or other load bearing type of dyno? Or.. Dynojet standard unit that won't load the drivetrain? Makes a 10-15% difference there as well.

 

I'd be happy with those numbers. Mine made 220 stock and gained 7 whp with an open TB, so looks like you've gained a good bit.