are they the same thing? what's the difference besides the words base and wheel.

 

I should tell you to search But...

It is brake horsepower and wheel horsepower (not base). Brake hp is at the crank, wheel hp is at the wheel. There is a significant amount of loss between the two due to drivetrain losses. An auto will lose more than a manual. Cars are rated at brake hp from the factory.

 

ya cuz brake is always higher haha

 

It's just what the manufacturer is saying the Motor itself produces, WHP figures are for racers bragging rights...haha Power:Weight is something worth keeping an eye on too.

 

That's one of the selling points that the manufacturers use to sell their cars when the rate it from the BHP.

 

What kind of parasitic loss are we looking at on a manual tC? 14%?

 

actually i thought it was more like 10-12%, 14 sounds a little high.

 

From the dynos I have seen posted, it is between 12 and 14%.

 

Also, if it's a supercharged tC (TRD), there is also a loss of something around ~%30 in order to power the supecharger. Just FYI.

 

As efficient most performence parts operate these days I would highly doubt your 30% loss claim.

 

Not exactly my info though, but it came from a highly experienced/knowledgeable source. A professional builder.

 

yea but it takes horse power to make more horse power..so its not really loosing horse power it should be gaining..especially with a supercharger.

 

BRAKE HORSEPOWER and WHEEL HORSEPOWER = SAME.

it's CRANK horsepower that's the different one.

 

100% incorrect. Brake Horsepower is CRANK horsepower. It has nothing to do with the brakes on the car, the wheels or anything.

And the horsepower used to make horsepower goes to efficiency. That is why a turbo is more efficient than a supercharger. While it does create backpressure, it is utilizing less power to make its power than a sc is.

 

^as a fellow engineer, I would trust him. He is right. and a 30% loss to make the S/C work is high, I remember seeing somewhere that its not nearly that high

If it was, we would be seeing a dramatic MPG decrease after putting on the S/C

 

Correctomondo!

5 Speed 05-06 tCs are crank rated to 170 HP or something, and actually come out to 140 wheel HP.

 

ahh.. it appears you're correct. my apologies.

 

no need to apologize! I wouldnt care to list the # of times in the day I am corrected

 

sooo if anyone even reads this... is there a more accurate % for the sc?

 

manual car loses about 12-16% drivetrain loss. auto 18-22%.

supercharger takes about 30% but many times doubles that power loss.

turbo also takes power to make power, you need a certain amount of power/backpressure to spool up if not ur never going to spool and just choke the motor on backed up exhaust. turbo makes more power since its potential is higher in the rev range that the impeller spins at a higher revolution compressing the air more.