anybody know...

I don't think I've come across this here. Does anybody know about how much the 4.0 puts down to the wheels?

I know the rule of thumb is that about 20% of the rated hp/tq is lost to an auto drivetrain and about 10% in manual. Is that still true with todays automatic transmissions?

Dyno anyone?

 

10% is awfully generous for a standard transmission. While slushboxes certainly have a lot of loss due to their nature, much of the loss also comes from the distance from the power source, weight of moving parts, unsprung weight, etc.

 

My guess is a little under 200whp stock. I want to jump on a dyno this summer but I think I could make 245whp maybe.

 

15%-17% is usually the case depending on how effieciently power is transfered. Manual isn't going to put down 10% more power though IMO. If I had to guess I would say that the RWHP would be right at 200.

 

Ah, i knew Chris would have the answer! I was hoping the X's guys would actually have dyno though. Thanks!