So if the S2000 have 240/237 on paper, then what are the REAL figures?

 

those are the real figures.. the motor makes that power. but due to drivetrain losses like on any other car. .not all the power hits the road.

 

Those are the "real" figures, with 190-210 being the "wheel" figure.

 

*sigh*

Those ARE REAL figures.

There are different ways to measure horsepower. The figures you use (237/240) are the HP numbers measured at the engine. These are the numbers that are always advertised by the manufacturer.

All the HP doesn't reach the wheels however, because of drivetrain loss. The power goes through the gearbox, clutch, driveshaft, etc. etc., and it takes power to turn each and every one of those. By the time it gets to the wheels, it's down a percentage. (I've always heard about 15-17% for 2WD, more for AWD).

Wheel Horsepower (WHP) is measured on a dynamometer, or "dyno" to the F&F crowd. Different dynos measure HP differently. I was weaned on dynojet numbers, and I believe they're slightly more readily used than others (dynapack/mustang), but to answer your question, for the most part, to the wheels on a dynojet:

(00-01) AP1 ~ 195-200 RWHP
(02-03) AP1 ~ 200-205 RWHP
(04-06) AP2 ~ 205-210 RWHP

Bear in mind, those are rough numbers, and your results will vary.

 

understood....my fault. what I met to say was: How much power advantage will a s2k w/gears vs an s2k w/o gears?

how much power difference will be transfered to the wheels as a result of gears?

 

Its all physics..

Friction is the reason that 240 horses from the engine do not make it to the pavement. Friction=transfer of energy (the energy transferred by friction turns into heat which is radiated out into the atmosphere by the conductive metals used in construction of drivetrain components). The less direct the route from the engine to the wheels, the more energy loss due to friction. Some energy loss comes from the flexing or bending of those materials (very very small amount) which results in the same type of energy transfer... heat. This holds true for every car... and for that matter everything mechanical....

 

I get it now.

Thanks.

 

[QUOTE=turbo997,Jun 27 2006, 09:39 AM] understood....my fault.

 

Power is the same with gears, it just gets used differently. Put simply: you sacrifice top speed for slightly quicker acceleration.

997, you sound like a budding enthusiast. There is a wealth of information readily available on this board for anyone to access. If I could suggest something: Sit back, and soak it all in. Search for topics you're interested in, and read a lot. (Trust me, there's a lot to read) You'll find many of your questions have already been discussed at one time or another.


HTH

 

haha this is where I am at for reading/searching these threads thus far. the more I read the more questions I have :/ ....that could be a good or bad thing