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12-04-2012, 11:44 AM | #23 | ||
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12-04-2012, 12:38 PM | #24 | |
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the text below if from Hotrod...
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12-04-2012, 12:45 PM | #25 |
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With a roll out you cannot measure the drive losses.
First of all you use the other side of a gear (other side of the tooth) which is not 100% representable, and secondly they don't know the total moving mass of the drivetrain, so they dont know the part that is loss and the part that is stored kinetic energy. Imho it's an equation with 2 variables, so it's still an estimate. Maybe a better one (or worse one) than the competition but still an estimate. If drivetrain loss wasn't effected by the power that goes through the drivetrain it would be (easily) measurable at the wheels, but it isn't. Anyway, the engine power is not what gets you running, it's the wheel power, so it's best to focus on that. |
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12-04-2012, 12:55 PM | #26 | |
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But the rest of the story gives a good picture. A dynometer value itself says nothing; it's a fictional number. Tuning your car and doing different dyno runs give an insight in the gains achieved, and when you want to compare, you should have a (verifiable) and documented list of runs from other cars on that same dynometer (under similar circumstances). Only then you can have an insight of your car's performance. |
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12-04-2012, 02:25 PM | #27 | |
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I was pretty suprised by how many "dynometer engineers" we have here, who jumped right on the bandwagon. I'm not trying to defend chassis dynos, just trying to find out more about it. MAHA seems to be pretty credible manufacturer of dynos as they make a lot of professional gear including very expensive dynos for OEM manufactures like Audi, Volkswagen etc. |
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12-04-2012, 02:35 PM | #28 |
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ok.
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12-04-2012, 07:55 PM | #29 | |
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12-05-2012, 05:16 AM | #30 | |
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And if your dyno output is correct as you're saying all the time that's only 256 bhp for your car that gets you going. The other 93 bhp is just a waste of gas really Last edited by GuidoK; 12-05-2012 at 05:32 AM.. |
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