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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: equations to calculate power and torque?
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Wed, 18 June 2003 03:23
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Chuck, well, if we can get a bunch of data for different engines and their torque and power numbers for stock motors (at specific rpm) then we can get a good idea of what efficiency/ losses they have..
Liam,
well starting with kw, multiply by 1.34 to get HP.
then ftlbs = (HPx5252)/rpm
then Nm = 1.336 ftlbs and 1 ftlb = 0.748Nm
(since 1ft lb = (1/2.2)x9.8x0.3)
0.748Nm = (1.34kwx5252)/rpm
0.748Nm = (7037 kw) /rpm
so
Nm = 9408.66 kw / rpm
that's where i got the 9402 from (carried numbers this time tho 
bassaholic, thanks for that, was wondering about that too 
hmm so 92mph for my rolla then... got any ET estimate calcs?
i think an F1 car has more drag actually, since they produce like a few hundred kilos of downforce (can't they run upside down above a certain speed?)
Norbie, yup, understood.. i used these eqns with my dyno day 5 graph, picked numbers along the graph and plugged into excel, so i could generate a torque curve.. as you said, these Eqns are _only_ to calculate torque/power at a specific rpm.
hopefully someone wil bring a laptop to the dyno day so we can do some number plugging!!!!
Cya, Stewart
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