just been looking at thor rr day results and most autos lose about 80/90 bhp at the wheels

mine lost 140 today

@fly 357.5

@wheel 217

any ideas

 

steve

just been looking at thor rr day results and most autos lose about 80/90 bhp at the wheels

mine lost 140 today

@fly 357.5

@wheel 217

any ideas

 

steve

 

Steve what sort of Dyno did you go on ???? SE's dyno figures were similar although there seems to have been an issue with the loss figures on the rolling road type dyno with auto's.

 

Thor was different they just gave a RWHP figure

 

Ryan

That is why you should really go off the wheel HP. That is what a dyno measures, and then uses some % to estimate the flywheel. The %age loss is probably not the same for each dyno machine or, each place puts their own vaules in.

Steve

 

All that counts is rwhp. The measured loss is an estimate and an auto transmission isnt measured correctly. In theory the power loss of an auto in locked up 3rd gear is exactly the same as a manual in 4th gear because the torque converter is by passed and the diff is the same in either case. Not sure if welly to the floor cuts out the lock-up clutch and re introduces the torque converter tho. Loss is probably more like 60bhp depending on rpm max power is seen as losses are proportional to transmission rpm.

 

Is yours modded or stock?

steve

 

it runs at 15 psi

s/s zaust custom de cat

apexi induction

j/d chip

goes 10 times better than it did standard ??

 

steve

Steve what sort of Dyno did you go on ???? SE's dyno figures were similar although there seems to have been an issue with the loss figures on the rolling road type dyno with auto's.

 

Thor was different they just gave a RWHP figure

 

Ryan

ryan

it was a rolling road type dyno

i was the only auto on the day

 

steve

Thought you had some wheelspin problems though - that won't help the figures, surely?

steve

 

it runs at 15 psi

s/s zaust custom de cat

apexi induction

j/d chip

goes 10 times better than it did standard ??

 

steve

Those figures have got to be suspect with those Mods, my car got 230 @ the wheels with only an exhaust (inc Cats) and Induction kit, stock boost, stock chip.