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Location:
Northwestern Sydney
Registered:
August 2002
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Rear wheel kw --> fly wheel kw ?
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Fri, 05 August 2005 05:38
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What is the adopted conversion for rwkw to engine kw that is adopted most commonly.
I want to convert 229rwkw to engine output and I get different people using different conversions?
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Location:
Campbelltown
Registered:
November 2003
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Re: Rear wheel kw --> fly wheel kw ?
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Fri, 05 August 2005 05:43
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most mags take a 30-25% drive train loss as common though these days the figures are dropping (diff/dodgy dyno) ie GTS commo stock putting out 240rwkw.
so lets assume 25% thats means your SS ute has 305.3333333kw at the fly wheel.
At 30% loss it would be 327kw
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Location:
Northwestern Sydney
Registered:
August 2002
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Re: Rear wheel kw --> fly wheel kw ?
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Fri, 05 August 2005 05:55
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So the 1/3 (or 33%) loss isn't used much any more.
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Location:
Campbelltown
Registered:
November 2003
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Re: Rear wheel kw --> fly wheel kw ?
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Fri, 05 August 2005 05:59
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not that i know of i always use 30% when doing quick calcs and thats pretty much bang on what was happening at SAS for the dyno day ie 71.4fwkw put out by a stock 100kw 4ag.
My car put out 63.2rwkw and rated at 87kw at flywheel.
Mind you in one motor hot tuner issue they had an ss flash tuned and the dyno read 228rwkw stock (dodgy) but it was fast for a stock ss and after the flash tune (an extra 18rwkw) it dropped into a high 12 second quarter.
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Location:
Northwestern Sydney
Registered:
August 2002
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Re: Rear wheel kw --> fly wheel kw ?
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Fri, 05 August 2005 06:05
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My tune read 171.5 stock 
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Location:
Campbelltown
Registered:
November 2003
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Re: Rear wheel kw --> fly wheel kw ?
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Fri, 05 August 2005 06:11
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at 30% loss thats bang on 245kw is it a Vy series 2 cos that be whats its supposed to be putting out. But meh i wouldn't really trust a lot of dyno figures 170 sounds about right for a stock gen 3 ss motor though, i have seen the results for a few street commodores dyno days and most put out around that figure.
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Location:
Northwestern Sydney
Registered:
August 2002
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Re: Rear wheel kw --> fly wheel kw ?
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Fri, 05 August 2005 06:18
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So 320 is pretty much on the mark then....
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Location:
Campbelltown
Registered:
November 2003
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Re: Rear wheel kw --> fly wheel kw ?
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Fri, 05 August 2005 06:22
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yep thats what i'd say  nice ute by the way shame i don't have that kinda money yet.
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Location:
Northwestern Sydney
Registered:
August 2002
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Re: Rear wheel kw --> fly wheel kw ?
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Fri, 05 August 2005 06:59
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Ta. I'm doing some touch up work and am wanting to put a "320" badge on the tailgate + plus some bling wheels. so I can justify the price.
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Location:
Sydney
Registered:
August 2004
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Location:
Adelaide
Registered:
May 2002
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Re: Rear wheel kw --> fly wheel kw ?
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Fri, 05 August 2005 15:49
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i have always adopted the approach 1hp at the wheel equals 1kw at the fly
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Rear wheel kw --> fly wheel kw ?
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Sat, 06 August 2005 13:13
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| faulksy wrote on Fri, 05 August 2005 23:49 |
i have always adopted the approach 1hp at the wheel equals 1kw at the fly
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That assumes a 25% drivetrain loss, which is about right.
I go for 25% for auto's, 20% for manuals.
Also they heavier the drivetrain, the more the loss.
ie, a G-series diff will loose slightly more power than an F-series, because it has to turn more mass.
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Banned by his request
Location:
moved to tamworth
Registered:
July 2002
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Re: Rear wheel kw --> fly wheel kw ?
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Sat, 06 August 2005 22:21
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or you can take the engine out and get it engine dynoed and you will know the real HP your car has,not tuning HP.
mick
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Location:
Pine Rivers QLD
Registered:
April 2005
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Re: Rear wheel kw --> fly wheel kw ?
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Mon, 08 August 2005 23:21
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| faulksy wrote on Sat, 06 August 2005 01:49 |
i have always adopted the approach 1hp at the wheel equals 1kw at the fly
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Thats how i live my life too. makes everything so simple that way.
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Location:
Central Coast, NSW
Registered:
February 2005
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Re: Rear wheel kw --> fly wheel kw ?
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Mon, 08 August 2005 23:33
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| ndgcpr wrote on Tue, 09 August 2005 09:21 |
| faulksy wrote on Sat, 06 August 2005 01:49 |
i have always adopted the approach 1hp at the wheel equals 1kw at the fly
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Thats how i live my life too. makes everything so simple that way.
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you mean you dont live your live a quarter mile at a time?
poser...
 
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Location:
Pine Rivers QLD
Registered:
April 2005
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Re: Rear wheel kw --> fly wheel kw ?
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Mon, 08 August 2005 23:51
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nah, i cook my rice in the microwave. and for those 10 seconds or less i am free...
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