20 HP and 24 lbs torque with fuel,air,timing possible?

[The Radium King]

Originally Posted by KRAM36

How can a chassis dyno machine know the drive train loss on a car?

you can add a correction factor into a dyno; someone could have easily modified those dyno results with a 1.15 or 1.2 correction factor so that it was reading high. as was previously stated, the only real information you can get from a dyno is change in hp, not absolute numbers. and in all the tuning i have seen of boxsters, i have yet to see anyone bolt on a 50 hp increase. i have seen people brag of 300 hp, but no 50 hp increase. that's why everyone always wants before and after numbers, because absolute numbers mean nothing when it comes to dynos.

[Jake Raby]

So if Jake Raby is seeing a 4% swing on manuals, how is a chassis dyno machine going to know how to accurately calculate drive train loss?

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.