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Old 02-05-2008, 05:53 PM   #1
Scooby Specialist
Member#: 41561
Join Date: Aug 2003
Chapter/Region: MWSOC
Location: Chicago
04 GT3076 2.1
Stroker = Broken 3rd

Default Anyone have the maf scaling values for an Perrin Big MAF. Stock WRX injectors

Does anyone have the MAF scaling values using stock wrx injectors.

This means if you have an 02-05 wrx with a big maf using stock injectors what are your maf scaling used. (This one is probably unlikely)


06-07 wrx using perrin big maf using stock injectors.
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Old 02-05-2008, 06:57 PM   #2
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Join Date: May 2006
Chapter/Region: Tri-State
Location: UDel, illidelphia
2006 vf39 R0mRa1DeR
Darknessess Wagon


First, calculate the cross sectional area of each intake at the maf.

Stock is Pi*(65/2)^2 (65mm diameter)

The multiplier is: Perrin area / Stock area , and should be greater than 1 in this case.

Multiply the entire maf table (stock) by the multiplier and that's your new table.

This will get you pretty close, depending on how well the perrin is designed.

I would increase the multiplier by a few percent, just to make sure you'll be running rich when you actually start tuning the table.
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