Hey all! This is kind of a noob question but why does the BPU kit on suprastore.com claim 460hp but most of the BPU supras i see usually dyno at about 380? Is this because you need ++ or is it an advertising claim to get you to buy or is there a lot much power loss through the drivetrain?

No when you c the 380rwhp it means 460bhp . yeah and the BPU++ with a good tuneup gives the supra Almost 420-430rwhp wich could be 500+ bhp . and yeah the question is kinda noob but its ok every 1 starts from somewhere right no one was born knowing everything no they get to Learn it step by step .


With Great H-Power comes a Great Responsibility for Great Speed ======================>

Store numbers = at the crank on race gas
Dyno numbers = at the wheels

O-J,
380 rwhp does NOT translate to 460 crank. Calculate an approximate of 15% of drivetrain loss for a 6sp. and 20% for an auto. 430 on a 6 sp. is about 500 crank HP, not more than that.

-Olivier

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I guess I'll be surfing here until...I get tired of it!

quote:

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Originally posted by Olivier Caza:
O-J,
380 rwhp does NOT translate to 460 crank. Calculate an approximate of 15% of drivetrain loss for a 6sp. and 20% for an auto. 430 on a 6 sp. is about 500 crank HP, not more than that.

-Olivier

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I guess I'll be surfing here until...I get tired of it!

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Depends on who you ask. I knew a guy in VA Beach who built race engines and had a dyno used by every kind of car under the sun. He swore manual loss was 20% and auto trannies even higher (22-25%). Since he dyno'd engines before putting them in the car and then did the chassis dyno (and he had dyno'd several hundred cars), I didn't argue.

380whp with 15% loss is 447bhp. With 20% loss it's 470bhp. A safe estimate is to split the difference and call it 460bhp.

1997 Supra TT, 6spd
Bone stock.
291.5rwhp/294.3rwtq