Power Loss through Drive Train?

[93RiceKillinGT]

Ok
If you have a 5.0 GT-40 crate engine that puts out 345 horspower at the flywheel how much of that will make it to the rear wheels with a manual transmission? We all know that the stock 5.0 put out 225 horsepower at the flywheel and in several dyno tests in some of the biggest mustang mags the results came to around 190-195 horsepower at the wheels. So its been proven that with a manual transmission car you loose roughly 35 horsepower right?


So if my engine which is currently being built is being built up to produce 345-350 horsepower at the flywheel then that means i will run around 300 at the wheels right? I also forgot to mention that I have the Alum. Driveshaft, Manual tranny, and 3.55 rear gears. Am i right or am i wrong?

 

[slytherin]

Yes you should be damn close too 300 at the wheels.

 

[ALMOSTFINISHED]

They say depending on the conditions you will lose about 15% thru the drivetrain on a manual trannsmission car, and around 20% for an automatic car. Those seem to be the going rates and the most average ones.

Nick

 

[FastA$$89Vert]

I used to have the crate motor you are talking about. I can tell you this.

They get those numbers assuming you have electric fan, GT-40 Upper and Lower and some other stuff.

I had that setup with the cobra upper and lower and even had 1.7rr and it dynod at 271rwhp/304rwtq but it was never dyno tuned.

 

[93RiceKillinGT]

If you lose 15% of your engines power do to the drive train then that means that an engine putting out 320 horsepower at the flywheel will loose 48 horsepower and put out 272 at the rear wheels.

Now if you have a 420 horsepower engine and you loose 15% though the same eaxact drivetrain you will loose 63 horsepower and put out only 357 at the wheels.

Come on. That 15% horsepower loss is not true. That means that the more horsepower my engine puts out the more power i will loose to the transmission and rear end. Am I right or am I wrong???? Do the math. Take away 15% horsepower from your total engines output!

 

[93RiceKillinGT]

Seriusly guys you should see if this is true....

 

[blackstangt]

that's how it works though, the drag is a percentage, just like everything else, you add a larger tb to a crazy motor it adds more than to a stock one, things subtract the same way.

 

[Daggar]

You've got to consider rotational loss, valvetrain frictional loss, and drivetrain frictional loss. The 15% is a rule of thumb but one that come pretty damned close. So Yes... the more power you make the more you will loose before it gets to the rear wheels.