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rwkw to flywheel kw with auto 

 

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 Post subject: rwkw to flywheel kw with auto
Posted: Wed Jan 09, 2008 9:08 am 
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G'day just wondering if there is an easy way to work out rwkw to flywheel, also with auto transmission. I have 127rwkw and i think stock is around 105rwkw.

cheers

 

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EL Futura: CVE head, Wolf V500, ICE Ignition and Coil, 36lb injectors, Walbro 255lb, Paci comps, 3" exhaust, T5, Harrop Truetrac with 3.9s. Now with 198.9rwkw, (~185rwkw and 13.80 @99.1mph) with more power to come

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Posted: Wed Jan 09, 2008 9:34 am 
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Yep 157kw @ motor is stock, and 105kw @ wheels seems to be common.

So behind the BTR auto i estimate 33% loss, but less loss with high HP cars

So yours would be 127kw @ wheels, and 169kw @ motor
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Posted: Wed Jan 09, 2008 9:52 am 
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every car is different!!!!!

there is no way to give u an exact FWKW from your RWKW figure

the condition of your tranny can affect it

as was said ^^ figure around 30% and it will be a good BASE value NOT exact

 

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Posted: Wed Jan 09, 2008 10:00 am 
Getting Side Ways
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Ok cheers i have heard the loss was around that. If a XR6 has 164kw @ motor and 110-112rwkw how does mine only have 169kw? what calc did you do?

 

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EL Futura: CVE head, Wolf V500, ICE Ignition and Coil, 36lb injectors, Walbro 255lb, Paci comps, 3" exhaust, T5, Harrop Truetrac with 3.9s. Now with 198.9rwkw, (~185rwkw and 13.80 @99.1mph) with more power to come

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Posted: Wed Jan 09, 2008 10:54 am 
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GeZza200 wrote:
If a XR6 has 164kw @ motor and 110-112rwkw how does mine only have 169kw? what calc did you do?


im not sure how much xr6's put out, but youve got 5kw more which is pretty good considering the xr6 has bigger cam, o/s exhaust valves & bigger fuel regulator !!

For your car's calc. i just multiplied 127kw by 1.33 (33%). If yours was a manual there would be less loss, maybe 25%

But like said, its all guessing & estimation..... theres a few factors which can change motor->wheels power loss, and even dynos vary so much.
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Posted: Wed Jan 09, 2008 12:18 pm 
Getting Side Ways
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Oh yep, do the XR fuel regs do anything?

 

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EL Futura: CVE head, Wolf V500, ICE Ignition and Coil, 36lb injectors, Walbro 255lb, Paci comps, 3" exhaust, T5, Harrop Truetrac with 3.9s. Now with 198.9rwkw, (~185rwkw and 13.80 @99.1mph) with more power to come

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Posted: Thu Jan 10, 2008 6:29 pm 
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well, look at it this way.. from claimed flywheel to rwkw there is 52kw difference ( 157 fwkw, 105 rwkw). add 52 (power lost) to 127 and you should be close. 175 would be a mx guess. with a zorst and intake setup like that you would be looking at 13+ kw easy, especially once your ECU learns in.

but its delivery that matters, not peak. which is how XRs puch outside their "peak power" weight.

 

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Posted: Thu Jan 10, 2008 7:24 pm 
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Easy guesstimate at this is to convert your rwkw to hp.
The hp figure should give you a rough fwkw figure

So 127rwkw's =170hp which = 170fwkw.

Ballpark figure only.
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Posted: Thu Jan 10, 2008 9:41 pm 
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ok, thats an alright increase i guess, can you compare other dyno sheets to each other or does it have to be compared from the same dyno

 

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EL Futura: CVE head, Wolf V500, ICE Ignition and Coil, 36lb injectors, Walbro 255lb, Paci comps, 3" exhaust, T5, Harrop Truetrac with 3.9s. Now with 198.9rwkw, (~185rwkw and 13.80 @99.1mph) with more power to come

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Posted: Thu Jan 10, 2008 10:03 pm 
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Ok iv tryed to work out something here probly dont work but yeah, If you divide 105kw into 157kw you get 1.4952. So if you multiply 1.4952 by 127kw you get 189.9kw. Does that sound alright or is it just s**t?

Because i have a dyno sheet of a AU1 XR8 with 124rwkw and they have 185fwkw, also have another sheet of a AU1 XR6 with 110rwkw and they have 164fwkw and they both equal up if you do the math.

 

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EL Futura: CVE head, Wolf V500, ICE Ignition and Coil, 36lb injectors, Walbro 255lb, Paci comps, 3" exhaust, T5, Harrop Truetrac with 3.9s. Now with 198.9rwkw, (~185rwkw and 13.80 @99.1mph) with more power to come

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Posted: Thu Jan 10, 2008 10:16 pm 
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why do u care how much fwhp u hav? its the power turning the wheels that counts

also remember just because ford claim there xr6 motor puts out 164kws doesnt mean it or many of them atleast actualy do

manufacturers are notorious for stretching the truth a little
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Posted: Thu Jan 10, 2008 10:18 pm 
Getting Side Ways
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Yeah i no it counts whats is at the wheels im just trying to compare it to the newer cars

 

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EL Futura: CVE head, Wolf V500, ICE Ignition and Coil, 36lb injectors, Walbro 255lb, Paci comps, 3" exhaust, T5, Harrop Truetrac with 3.9s. Now with 198.9rwkw, (~185rwkw and 13.80 @99.1mph) with more power to come

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Posted: Thu Jan 10, 2008 10:38 pm 
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Rough rule of thumb, what ever it makes at the wheels in HP is what it makes at the engine in KW. Seems to work for me
Brett

 

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Posted: Thu Jan 10, 2008 10:45 pm 
Getting Side Ways
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Age: 29

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Ride: 98 EL Futura

Power: 199 rwkw

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but that means if a standard falcon has 105rwkw it has 140rwhp, and they have more then 140kw

 

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EL Futura: CVE head, Wolf V500, ICE Ignition and Coil, 36lb injectors, Walbro 255lb, Paci comps, 3" exhaust, T5, Harrop Truetrac with 3.9s. Now with 198.9rwkw, (~185rwkw and 13.80 @99.1mph) with more power to come

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Posted: Fri Jan 11, 2008 12:52 am 
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Power: 192 rwkw

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GeZza200 wrote:
but that means if a standard falcon has 105rwkw it has 140rwhp, and they have more then 140kw


i wouldnt put money on it
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