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Author Topic: How work the torque and engine power calculation?  (Read 3673 times)
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2mal4
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« on: October 20, 2013, 02:40:54 am »

We have tested a lot in the last days. It seems that engine power and torque in general are showing to high numbers.

We adjust to .46 lb/(hp*h) and 85%. The results with the same MAF 420g/sec differ around 10%. Normally the most will say that MAF multiplied with 1.22 will give you an idea of the PS/hp.

What parameters will taking into account for the calculation in DashCommand? What impact will have a change of brake specific fuel consumption and the volumetric efficentcy.

Just like to calibrate the tool.

Best regards Bernd
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Weston@PPE
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« Reply #1 on: October 23, 2013, 04:33:33 pm »

Our horsepower calculation relies on the BSFC setting and the calculated fuel flow (which uses MAF, or MAP and VE is MAF isn't available). Increasing the BSFC setting will lower the calculated HP. Our default is 0.44, which is our best guess at an average for NA engines -- but some engines might need higher or lower values.
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2mal4
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« Reply #2 on: October 24, 2013, 02:59:30 pm »

Weston, thank you very much.

I think I will try .48 for the Audi RS4 V8. This might bring the results much nearer to the dyno measurement.
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Weston@PPE
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« Reply #3 on: October 24, 2013, 06:48:50 pm »

Keep in mind that its estimated engine power, not wheel power. It should read 15-25% higher than a dyno would, since drivetrain losses are not taken into account.
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2mal4
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« Reply #4 on: October 25, 2013, 04:29:17 pm »

Weston, thanks but usually drivetrain losses are calculated on our dynos and we got three results: drivetrain loss, wheel-hp and engine-hp
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