BMW E46 Fanatics Forum banner

1 - 9 of 9 Posts

·
Registered
Joined
·
1,103 Posts
^ :rofl:

How do you know which figures to use when determining drivetrain loss?? i.e. 10%. 15% or 20% for a manual car?
 

·
Registered
Joined
·
1,103 Posts
^ :rofl:

How do you know which figures to use when determining drivetrain loss?? i.e. 10%. 15% or 20% for a manual car?
Anyone? :hmm:
 

·
Registered
Joined
·
42 Posts
There are too many variables to determine actual wheel horsepower from just brake horsepower.
I'd guess probably 80% of the bhp is whp.
 

·
Registered
Joined
·
2,468 Posts
Crank horsepower is probably the most useless number in the world. Very few manufacturers of performance parts actually measure at the crank, they usualy just convert the wheel power using 15 or 20% formula. Since everbody uses different number for drivetarin loses and the loses are not really linear comparing chp makes no sense.
It looks like you are looking for some FI kit for your M3 - ask the manufacturer for the dyno (although those can be massaged too)
 
1 - 9 of 9 Posts
Top