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152rwkw in kws??.. ford ba 2004 

 

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 Post subject: 152rwkw in kws??.. ford ba 2004
Posted: Fri Nov 29, 2013 6:10 pm 
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Age: 26

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Joined: 21st Feb 2012

Ride: 2004 Ba Xr6

Location: Melbourne
VIC, Australia

Just had flash tune done on my 4speed ford ba with 4:1:1s came up with 152rwkw what is it in kws thx
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 Post subject: Re: 152rwkw in kws??.. ford ba 2004
Posted: Fri Nov 29, 2013 6:11 pm 
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Ride: EF 2 Fairmont. AU 5 Litre ute

Location: Berwick
VIC, Australia

Maybe 210kw. Someone else would know the maths to work it out right
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 Post subject: Re: 152rwkw in kws??.. ford ba 2004
Posted: Tue Dec 03, 2013 7:56 am 
Getting Side Ways
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Ride: EF XR6 Wagon, AU2 XR6 VCT

Power: 148 rwkw

Location: Auckland
New Zealand

There is no standard formula; every setup is different. Drivetrain losses can range from less than 10% (eg, a purpose-built race car with manual transmission and light flywheel) to more than 25% (eg, an automatic with high-stall convertor). Even diff oil viscosity, wheel weight and tyre pressure can make a difference.

For an automatic in a road car, you would be lucky to get better than 80% efficiency (20% loss). Using this as a rule of thumb, 152 rwkw means you have at least 190 kw at the crankshaft (152 / .80), possibly 200 kw. I haven't seen any back-to-back engine and chassis dyno runs on a Falcon six, so this is just an educated guess.

 

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95 EF XR6 wagon, 17" FTRs, DBA, QFM, KYB/Koni, AU block, ported EF head, SS Inductions, Territory intake, MLS gasket, milled, Franklin RH24B cam, Coby headers, no cat, Tickford 2.5", 2800rpm stall, J3 chip

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 Post subject: Re: 152rwkw in kws??.. ford ba 2004
Posted: Tue Dec 03, 2013 1:24 pm 
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NSW, Australia

AussieXR6Grunt wrote:
Just had flash tune done on my 4speed ford ba with 4:1:1s came up with 152rwkw what is it in kws thx


approx. 200kw at engine
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 Post subject: Re: 152rwkw in kws??.. ford ba 2004
Posted: Tue Dec 03, 2013 1:43 pm 
Getting Side Ways
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Joined: 22nd Jun 2011

Ride: '97 EL Fairmont Ghia

Location: Perth
WA, Australia

While on this subject, are drivetrain losses a percentage or an offset? Like a 1000hp engine would make 800rwhp, but what if there was a 200hp engine, it would have 160rwhp? or 0? Why does the 1000hp engine lose 200hp?

 

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 Post subject: Re: 152rwkw in kws??.. ford ba 2004
Posted: Tue Dec 03, 2013 10:06 pm 
Getting Side Ways
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Posts: 836

Joined: 1st Apr 2005

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Ride: EF XR6 Wagon, AU2 XR6 VCT

Power: 148 rwkw

Location: Auckland
New Zealand

Based on the numbers I have seen, it is somewhere between a constant percentage and a fixed offset, but closer to a percentage. All other things being equal, the percentage of drivetrain loss will decrease slightly as power increases. So, a 200kw engine might lose 20%, while doubling it to 400kw with the same drivetrain (assuming it could handle the power) you might lose 17-18%. It's that sort of relationship.

I'm sure someone, somewhere has studied this relationship and described it scientifically, but I haven't come across it. In any case, the only power you can use is what gets to the road surface, so engine kw becomes mostly academic.

 

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95 EF XR6 wagon, 17" FTRs, DBA, QFM, KYB/Koni, AU block, ported EF head, SS Inductions, Territory intake, MLS gasket, milled, Franklin RH24B cam, Coby headers, no cat, Tickford 2.5", 2800rpm stall, J3 chip

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