04MustangGT

I am basically new to all this modding and I am interesting in reading up on the Ford performance magazines for Mustangs.

What Iwould liketo know is...What are Dynos? The magazine I want to purchase is called "Building 4.6/5.4l Ford Horsepower on the Dyno " and 1 person commented on it saying ..."The book contains mostly engine dyno numbers, so you have to remember that the numbers will be higher than on a chassis dyno." What is the difference between engine dynos and chassis dyno?

So that is why I am asking. I really appreciate the help.

I own a 2004 Mustang GT 4.6L automatic

code3GT

An engine dyno does not take into account, drivetrain loss. It's basically flywheel horsepower.

racer02GTstang

the motor is out of the car on a engine dyno... on the chassis it shows what your car puts down at the rear wheels (rwhp).. which is mostly what most car guys talk about..

04MustangGT

So the name of the magazine is basically "Building Horsepower on the Fly" ? Like slang in other words? I'm sorry but I don't understand drivertrain loss. It really is all new to me.

Or does it mean adding modifications to only the motor and tranny?


oooooops I was replying to Code.

So basically I have to pull my motor out and then read?

St4ng07

Horsepower at the flywheel is going to always higher then at the wheels. The loss is due to rotating mass to get to the wheels Example: Transmission, Driveshaft, and Rear Diff. Hope that kinda clears stuff up.

04MustangGT

Yes it does thanks everybody!!!

gouldie1903

the driveline loss is the force resisting the rotation of the engine. a few of the factors are rotating mass and friction within the transmission and rear end.

dirtystang04

Sort of..I'm not too sure what your trying to get at here.. For example.. Ford says that your car has 260 horsepower, but that is at the flywheel. When you take into account all of the moving parts between your motor and the rear wheels that it has to turn to get the power to the ground, you end up with rwhp (rear wheel horsepower) Drivetrain loss is somewhere around 15% I believe give or take a few. So your STOCK Mustang GT with 260 flywheel horsepower is actually putting down ~~225 ~~ at the wheels or so.

dirtystang04

+1 (beat me to it!)[8D]

racer02GTstang

nope... to figure it out... you have about 15% drivetrain loss... so take your rear wheel hp and multiply by 1.15 and you have your estimated BHP... which is the crank hp, flywheel hp.. all the same stuff..