Compressor map "plotter"

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FlyboyS4

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	Re: Compressor map "plotter" « Reply #15 on: November 25, 2015, 10:00:39 PM »

Quote from: nyet on November 25, 2015, 06:50:32 PM

In reality though, post turbo drop goes up much faster than pre turbo drop, such that it DOES impact PR more.

I can't agree or disagree with that from what I know right now. It might not be that clear cut, and would be partly hardware dependent.


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TijnCU

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flying brick

	Re: Compressor map "plotter" « Reply #16 on: November 26, 2015, 02:26:23 AM »

I was sleeping I guess Grin

yes pre turbo pressure drop has a larger effect on PR in the calculation.
But this counts also above pr3, not just below: 50/14.7=3.40 51/14.7=3.47 50/13.7=3.65
Another motivation to keep your air filter clean!


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spacey3

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	Re: Compressor map "plotter" « Reply #17 on: November 26, 2015, 03:22:06 AM »

Apologies if this is a stupid question, but what variable should we log for plotting this graph?

For a 1.8t I have mshfm_w which appears to be the calculated airflow (mlhfm - mlofs offset etc.)

Also I have mlhfmm_w which appears to be the real measured airflow at the sensor.

Mlhfmm is significantly higher by around the bosch sensor offset - 200kg/h (55.5g/s)


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