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MAF volumetric efficiency

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Discussion Starter · #2 ·
To test MAF accuracy, I did a VE test (volumetric efficiency). Forscan with 3 PIDs. RPM, MAF grams/sec, and IAT. The O2 sensor is extra, just to make sure it's rich at WOT. This one looks good.

Then calculate VE. I used www.otctools.com/ve. A NA engine should be in the range of 75% to 85%. Mine calculated at 79%, which says my MAF is good enough. Maybe not perfect, but it's a cheap Ebay MAF. o_O

The test requires WOT. I peaked at 6117 RPM in 1st gear. Maybe not a good idea if your timing belt is old. Attempt at your own risk.
 

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Discussion Starter · #6 ·
Purpose of O2 PID was verification of expected response. It's "extra," not a VE variable. For VE calculation I don't need A/F number. I'm not in the market for tuner services.
 
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