Dynoed my Car
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I think the best thing to do next it call the dyno facility and see if they have run any other 996TTs there and, if so, find out the numbers they got and compare to yours. If they haven't, the best way to compare is to go down there again with a stock 996TT and compare back to back. Regardless of the actual numbers you get, you still should be at 125-150 more hp and tq at the wheels.
Just my $.02
Just my $.02
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I have a buddy that dynoed his car at Orbit a few months ago, this is what he told me about the dyno...
It is a Dastek Dyno (South African manuf). From what I am told it is an "eddie current loading dyno" as opposed to an "inertia dyno" and uses strain gauges to measure forces much more accurately.
btw... his stock GT3 dynoed at 363rwhp .
It is a Dastek Dyno (South African manuf). From what I am told it is an "eddie current loading dyno" as opposed to an "inertia dyno" and uses strain gauges to measure forces much more accurately.
btw... his stock GT3 dynoed at 363rwhp .
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Originally posted by Fanman
Not sure where you are getting your estimated crank hp #'s, but 476 * 1.15 = 547 hp. If you do 1.18 you would get 562 hp. I have seen very, very few cars dyno at a 9% drivetrain loss that you are indicating
Not sure where you are getting your estimated crank hp #'s, but 476 * 1.15 = 547 hp. If you do 1.18 you would get 562 hp. I have seen very, very few cars dyno at a 9% drivetrain loss that you are indicating
In other words, if crank hp were 100hp, given a 15% drivetrain loss, you'd multiply 100hp by .85 to get 85whp. Therefore, to calculate crank from 80whp, you'd do the opposite... divide 80 by .85 to get 100 crank hp.
For 15% drivetrain loss: 476 whp / .85 = 560 crank hp
For 18% drivetrain loss: 476 whp / .82 = 580 crank hp
Stephen
'01 Turbo Ti Upsolute
455rwhp, 505rwtq - Dynojet
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Originally posted by Sloth
I have a buddy that dynoed his car at Orbit a few months ago, this is what he told me about the dyno...
It is a Dastek Dyno (South African manuf). From what I am told it is an "eddie current loading dyno" as opposed to an "inertia dyno" and uses strain gauges to measure forces much more accurately.
btw... his stock GT3 dynoed at 363rwhp .
I have a buddy that dynoed his car at Orbit a few months ago, this is what he told me about the dyno...
It is a Dastek Dyno (South African manuf). From what I am told it is an "eddie current loading dyno" as opposed to an "inertia dyno" and uses strain gauges to measure forces much more accurately.
btw... his stock GT3 dynoed at 363rwhp .
A torque transducer equipped with a strain gauge measures the actual applied forces.
Inertia dynos accelerates the driveline against a "known" roller resistance of the dyno drums, and then back-calculates the hp figures based on the measured acceleration and roller's inertia. It'd be like measuring horsepower based on 1/4 trap speed, conditions, etc.
The bottom line is, unless you are after absolute horsepower (as in "accurate" hp, not "most" hp), using an inertia dyno is fine. You're more after relative analysis than anything else. That's why someone suggested get'n figures from previous Turbo dyno sessions.
Stephen
'01 Turbo Ti Upsolute
455rwhp, 505rwtq - Dynojet
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