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Old 12-12-2011, 04:49 PM   #5
Phatron
Scooby Guru
 
Member#: 36033
Join Date: Apr 2003
Chapter/Region: SCIC
Location: Tuning Lab
Vehicle:
CEO PhatBottiTuning
2006 STi GTX3582 + Meth

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Quote:
Originally Posted by faeflora View Post
How do I "tune fuel"? From what I understand, do I just adjust the MAF Sensor Scaling until my AFR gauge matches up with the targets in my Primary Open Loop Fueling table?
Basically yes. I set the OL table to 11 at wot then adjust the MAF to get there.

The major difference between the different methods is that changing the MAF scale changes the loads, which can effect all load based tables in the ecu.

So when you're scaling the OL portion of the MAF and you add 5%, all your load values are gonna go up.....so you may have just disabled your knock control, or be close to a load limt, or be riding the high load column in the timing and fueling table....

when you're changing the MAF scale you really need to think about how the Load is gonna change.

MAF based is not much different from MAP. Instead of MAP vs RPM tables its just Load vs Rpm and the load is calculated from the MAF via

Load = (MAF(g/s)*60)/RPM
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