What does 270whp translate into crank horsepower? I think that is around 330 crank hp right?

 

What the drivetrain loss on an automatic? 20%? 20hp for every 100hp? If you have 300 crankhp, then it was 240whp right? So if you have 270whp, then crank would be 337.5. My math sucks though. Maybe its right though. Anyone else?


400chp would be 320 whp
387.5chp would be 310 whp
375chp would be 300 whp
362.5chp would be 290 whp
350chp would be 280 whp
337.5chp would be 270 whp
325chp would be 260 whp
312.5chp would be 250 whp
300chp would be 240 whp

 

How about a 6MT?

 

I thought that you had an auto?

 

This isn't a question about my car. It's just a general question. So you add about 60 horsepower to any whp number.

 

no. your whp = around 85% of your crank horsepower. Therefore 270whp would be around 311chp. Correct me if I am wrong.

 

^^^^^

There is no way that it is 85%. That would only be a 15% drivetrain loss. That simply isn't the case with our cars. Sorry.

 

According to my dyno run it is almost exactly 85%. 238whp to rated 280.

 

so my 06 6MT sedan is at about 253.3 whp? That is 85%. Now if I do 20% loss due to drivetrain - it puts me at 238.4 whp.

Now if you think in terms of the 07 - the engine HP is anywhere from 352 - 367 hp! WOW

 

See post #12 for dyno of 06 with mods.
https://g35driver.com/forums/g35-coupe-v35-2003-07/124211-dyno-d-results-mods.html

 

You got a 6mt or auto? My bad on the %'s if your auto. But I'd be hard pressed to believe it.

 

Drivetrain frictional losses vary with rpm and fluid viscosity- temperature.........tire to road interface is the worst %, TC next %, then diff, driveshaft, finally gear mesh in tranny wheel bearings and half shaft bring up rear. Amount of rear camber and toe must be considered usually lumped into the 8-10% tire loss.

What ever gets the most temperature rise has the most friction.

 

Typically, on our cars, the loss is around 25% for an auto and 15-20% for a 6mt. It sucks bad.