Stock RWKW? - Page 2

blueoval · 22-05-2009, 12:23 PM

ok cool thanks for that

JC · 22-05-2009, 04:25 PM

Quote:

Originally Posted by Mr Hardware

JC, i'm interested in what you say about the 75% figure. So are you saying that say, the lower the power the more ambiguous the rear wheel figure?

Yes - driveline losses are not a straight %. In fact, I'd suggest there would a set amount of driveline loss, and then probably a % on top. So, for example, a BTR transmission in AU spec may zap 25kw off the bat, and then a further 5 or 10% of total power (heat etc are all power losses). The 25% is a rough rule of thumb (20% for manuals), and that's all it is.

To work out exactly how many rear wheel kilowatts (or mockawatts) you have, you must dyno the car (and yes, I know that sounds obvious.......).

JC · 22-05-2009, 04:26 PM

Quote:

Originally Posted by blueoval

Using JC's method of reasoning, I have calculated my power output AS A GUIDE.

Im currently getting 175rwkw. Approximately 235rwhp. Does that mean that I have approximately 235kw at the engine? I have an auto btw.

Yep, and that is supported by a 220 having around 165 at the wheels. Rule of thumb works well, doesn't it (as a guide!).

Mr Hardware · 22-05-2009, 04:37 PM

champion JC. All hail to the oracle!

blueoval · 22-05-2009, 04:38 PM

Quote:

Originally Posted by JC

Yep, and that is supported by a 220 having around 165 at the wheels. Rule of thumb works well, doesn't it (as a guide!).

Thanks mate.