Quote:
Originally Posted by DarkFangz1100
The formula I used is
((Torque*RPM)/5252)*.80
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Why would you think there is a 20% loss? That math doesn't hold true for my car comparing the HP tuner calculations and comparing to my dyno results. I would see the modifier as closer to .965 (not .80).
As an example, when I logged the run with HP tuners, it calculated my HP as follows:
run 1: 700hp @6331 vs actual real wheel HP 675
run 2: 729hp @6394 vs actual real wheel HP 705
In other words, the HP tuner appears to be calculating WHP, not FWHP. After multiple logged runs, I would say HP tuner is within 96-97% accurate on my application.
That might be based on all of the MAP settings and everything else. So that if it is seeing the correct data the calculations are accurate. This is important because if accurate, then I can run on the street and get some numbers and feel reasonably accurate that we are dealing with the right numbers (multiply results from HP tuner by .965 and it should be very close).
I will run another test his coming week. I am going to have the pulley overnighted so that I can up the boost. Then I am going to get a run in 4th on the street and compare it to the dyno. In fact, I may try to get one 4th gear run on the dyno just to erase a variable then I will also run in 5th to make sure I have apples to apples with my last dyno run.