Curious about HP loss through the drivetrain.

[j.fro]

Originally Posted by JFP in PA

Sometimes I wonder about the total fixation on maximum HP output. At our local auto cross, the perpetually dominant Boxster is a 2.7L bone stock (other than an IMS Solution) 986 with a five speed. He regularly hammers highly modified cars with seeming ease. It ain't always about horsepower............

Amen to that! I'm currently hunting down a couple of Z06 Vettes.

[edc]

Originally Posted by KRAM36

Make a call to your dyno shop and see if they can do that. When you make that, if you don't mind, ask them how they would do it with an automatic transmission.

Please.

I think you'd have to contact one of the dyno manufacturers like Dynojet, Dyno Dynamics or Maha. There will be an algorithm/formula in the software which will allow user input of a restricted amount of input parameters.

[KRAM36]

Originally Posted by edc

I think you'd have to contact one of the dyno manufacturers like Dynojet, Dyno Dynamics or Maha. There will be an algorithm/formula in the software which will allow user input of a restricted amount of input parameters.

Think I would rather do it the way it's stated in the Pelican article.

Originally Posted by Jake Raby

The dynos that show flywheel HP gathered at the rear wheels have always been a joke to me. The drivetrain losses are calculated through a wizard thats no where near accurate for the drivetrain of a Porsche. On top of that, the ones I've seen before allow the user to put what ever figure they want in for a drivetrain loss and the software moves the curve. Its a real good way to cheat.

Numbers gathered at the rear wheels should always be just that. They should not be converted to some wild guess drivetrain loss correction.

If you want flywheel HP numbers, gain those from an engine dyno.

The quickest way to slow a car down is to use a dyno to gather the wrong data, for the wrong reasons.