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Discussion Starter · #1 ·
Looking for Fuel > MAF Airflow table for 3" MAF.

Upgraded to lvl2 due to my engine is running lean with the provided base map and I have been able to remedy some of it previously by lowering the Injector Scale from 550 to 490.

I looked at the MAF Scaler and it matches what Phil says is the values for the stock intake system on one of his videos.

My initial thought is that this can be linearly increased by the percentage change of the area of the circle. In this case 2.5" to 3.0" is a 144% increase in surface area.

Below is a table of the MAF volts, the original value of the map and the modified 144%. Can someone with a 3" MAF validate this assumption?

Volts__Orig___144%
0.2_____0_____0
0.3_____4_____6
0.5_____14_____20
0.6_____36_____52
0.8_____73_____105
0.9_____129_____186
1.1_____210_____302
1.3_____320_____461
1.4_____464_____668
1.6_____646_____930
1.7_____873_____1257
1.9_____1149_____1655
2.0_____1479_____2130
2.2_____1869_____2691
2.3_____2323_____3345
2.5_____2848_____4101
2.7_____3448_____4965
2.8_____4130_____5947
3.0_____4898_____7053
3.1_____5758_____8292
3.3_____6716_____9671
3.4_____7778_____11200
3.6_____8949_____12887
3.8_____10235_____14738
3.9_____11642_____16764
4.1_____13175_____18972
4.2_____14841_____21371
4.4_____16646_____23970
4.5_____18594_____26775
4.7_____20693_____29798
4.8_____22949_____33047
5.0_____25366_____36527
 

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Just a heads up the stock intake is more like 2.55-2.6", so your multiplier was a bit off, but yes you're essentially going about it correctly.

For viewers at home, the NA cars have a different MAF scale...

-PV
 

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Discussion Starter · #4 ·
Out of curiosity why would the MAF scale on an N/A be adjusted as opposed to adjusting the Volumetric Efficiency table?

Or are you referring to N/A being ~2.5" and FI typically being ~3.0"?
 
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