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Old 09-15-2001, 06:05   #1 (permalink)
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calculations

Can someone please tell me how to calculate rear wheel Kw to fly and Kw to Hp.please be specific as im an idiot.
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Old 09-15-2001, 06:51   #2 (permalink)
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In actuality, you can't. It is impossible, due to the fact power is lost between the engine and the wheels; lost as friction, noise, heat as all the bits in the gearbox and diff soak up thier little share of the power the engine spits out to the clutch. You can't measure power loss if you don't know how much there was in the first place! Car manufacturers advertise actual engine output eg 220kW which is measured with the engien removed from the car. Most half-smart car modifyers quote rear wheel kW or horsepower (rwkw or rwhp) as that is alot easier to measure - you back your car onto a dyno and 'pull the string' (do a test) However, there is a rough rule of thumb - flywheel kW equates to rear-wheel horspower. eg a 200kW Falcon should punch out 'around' 200hp atthe treads; a 165kW Commy around 165hp etc. Each car is different; each dyno is different (although in theory, they should all be calibrated the same!); autos soak up more power than manuals. Wide tyres ands sticky tread compounds 'rob' more power, too. Very rubbery figures... but a good lie detector if someone says they have 300kW and only develop 200hp atthe wheels. Dynos are good at comparitive measurements (ie before and after - eg, extra power gained after an exhaust or other change to the engien)
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Old 09-15-2001, 08:01   #3 (permalink)
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kW to HP
Divide kW by 0.746 = HP

HP to kW
Multiply HP by 0.746 = kW

RWHP or RWKW
Multiply Flywheel HP or KW buy 0.66

Flywheel HP or KW
Multiply RWHP or RWKW by 1.34
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Old 09-17-2001, 04:29   #4 (permalink)
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Tanx.
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Old 09-17-2001, 04:52   #5 (permalink)
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Or if you are like me and want to conserve brain power just download calculator from here. :D

http://www.superford.org/utils/downloads.shtml
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Old 09-19-2001, 05:53   #6 (permalink)
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Quote:
Originally posted by XtRmn8
kW to HP
Divide kW by 0.746 = HP

HP to kW
Multiply HP by 0.746 = kW

RWHP or RWKW
Multiply Flywheel HP or KW buy 0.66

Flywheel HP or KW
Multiply RWHP or RWKW by 1.34
Is that for auto or manual?
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