My Toyota Starlet on dyno 02.02.08

WallaceGlanza

WallaceGlanza

Member +
TurboDave said:
Na its not, the wheel power is 159bhp its the bottom red line, the red line at the top is flywheel torque.

I know that they measure transmission losses through drag but 18% is a generally accepted loss for a fwd and not 34%.

Not knocking your result Scotty just trying to work it out.

Dave
Click to expand...

Maybe your right, If it was the way I said the torque is pretty low!:homer:

With 160whp and 213bhp thats roughly 25% transmission losses which isn't much different although still a bit high, although if it was 18% it would only be 190bhp.
 
TurboDave

TurboDave

Member +
WallaceGlanza said:
Maybe your right, If it was the way I said the torque is pretty low!:homer:

With 160whp and 213bhp thats roughly 25% transmission losses which isn't much different although still a bit high, although if it was 18% it would only be 190bhp.
Click to expand...

34% mate with 159bhp to make 213bhp.

:)

Dave
 
S

speedvision

Member +
i know u guys are dyno freeks and so on and u know ur stuff but i wanted to know how to calculate hp and bhp for my own knowledge so i went and did some hunting and found the following on how to calculate this so u guys can confirm and let me know if its correct

Formulas for brake horsepower

horsepower = rpm x torque / 5252

torque = 5252 x horsepower / rpm

brake specific fuel consumption = fuel pounds per hour / brake horsepower

bhp loss = elevation in feet / 1000 x 0.03 x bhp at sea level


so for bhp from the formula above it would be
rpm from graph 6200
torque from graph 181

6200x181/5252= 213 bhp...

if this is incorrect can u guys explain what is wrong?


also hp at the fly is calculated by dividing the wheel hp by 0.8 for manual cars and 0.75 for auto
so 160 wheel hp would work out to be 160/0.8= 200 hp at fly

correct me where wrong please guys..


thanks
sam
 
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