Chump
Member
Registered: 1st Feb 04
Location: Sharnbrook
User status: Offline
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if my power at the wheels is 160bhp on a c20xe with f20 - anyone know what my flywheel figure is likely to be?
thanks
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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with a transmission loss of 20% (about average)
looking at
192bhp
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Chump
Member
Registered: 1st Feb 04
Location: Sharnbrook
User status: Offline
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excellent 
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Cybermonkey
Member
Registered: 22nd Sep 02
Location: Sydney, Australia
User status: Offline
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transmission loss on a FWD wont be 20%, more like 12-14%
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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really iv always assumed it was about 18% its what other peoples losses work out at
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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oops thats for rwd cars....
"My own figures for transmission losses have been stated in previous articles but to recap they are usually no more than 15% of the flywheel power for FWD vehicles and no more than 17% for RWD ones. A good guide is to deduct 10% of the flywheel figure plus another 10 bhp for FWD and 12% plus 10 bhp for RWD. If you are starting from a wheel bhp figure then you have to apply those equations in reverse - add 10 bhp then divide by 0.9 for FWD or 0.88 for RWD to get back to a flywheel figure. Those figures were not just plucked out of thin air. They represent the culmination of many years of research and testing combined with the views of reputable companies like Bosch and VW. "
from http://www.pumaracing.co.uk/trans.htm
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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so with 15% losses you looking at 184bhp.
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Chump
Member
Registered: 1st Feb 04
Location: Sharnbrook
User status: Offline
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Thanks 
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