Dyno today
Joined: Sep 2004
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Originally Posted by johninator,Mar 3 2005, 11:50 PM
I am debating whether I should post this or not, but I think that it is important that I mention this.
My main objective here is to let other members who cares about the validity of these tests before they make their decisions based on these Dynapack results. For those who just cares to see the higher numbers, please don't mind this post.
Dynapack numbers can be misleading besides the smaller losses obtained by dynoing at the hub of the wheels. The software has mechanical/drivetrain corrections that can be set to compensate for the losses.
For example, if the factory rated the car at 240HP, and it dynoed 200HP to the wheels, the dynapack can calibrate the wheel HP back to factory rated 240HP by multiplying it by 240/200 = 1.2. Once that constant (1.2) is established for the S2000, it can be used back to the rest of the wheel HP from other runs such as the HP numbers from modification.
I don't want to name names, but I would like to share with you a dyno day session I've experience in a Dynojet. A G35 had a turbo setup on his car, which claims to have 401 WHP while showing me his Dynapack printout. Once it had a couple of runs on a Dynojet, its best run came out to 291WHP. He was furious and tried to call his mechanic right away regarding the situation. The Dynojet used here did not have these manual drivetrain loss corrections that can be set.
Given this, it is most likely that the 440HP above will dyno at 440HP/1.2 which is Approx 370WHP in the Dynojet @13psi which is still pretty impressive.
Check other Dynapack posts here, im sure you'll see what I mean. Hope this helps.
Sorry phil. No pun intended.
My main objective here is to let other members who cares about the validity of these tests before they make their decisions based on these Dynapack results. For those who just cares to see the higher numbers, please don't mind this post.
Dynapack numbers can be misleading besides the smaller losses obtained by dynoing at the hub of the wheels. The software has mechanical/drivetrain corrections that can be set to compensate for the losses.
For example, if the factory rated the car at 240HP, and it dynoed 200HP to the wheels, the dynapack can calibrate the wheel HP back to factory rated 240HP by multiplying it by 240/200 = 1.2. Once that constant (1.2) is established for the S2000, it can be used back to the rest of the wheel HP from other runs such as the HP numbers from modification.
I don't want to name names, but I would like to share with you a dyno day session I've experience in a Dynojet. A G35 had a turbo setup on his car, which claims to have 401 WHP while showing me his Dynapack printout. Once it had a couple of runs on a Dynojet, its best run came out to 291WHP. He was furious and tried to call his mechanic right away regarding the situation. The Dynojet used here did not have these manual drivetrain loss corrections that can be set.
Given this, it is most likely that the 440HP above will dyno at 440HP/1.2 which is Approx 370WHP in the Dynojet @13psi which is still pretty impressive.
Check other Dynapack posts here, im sure you'll see what I mean. Hope this helps.
Sorry phil. No pun intended.
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