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Old 11-02-2017, 01:35 PM
rotrex rotrex is offline
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Join Date: Jan 2014
Location: Germany
Posts: 187
Default Re: Nozzle spray angle...

AFR is a target the closed loop controller, if active, will try to hit that within it s limits.
IAT compensation compensates for a physical phenomenon. Air density drops about 3% every 10C. Your IAT table compensates for a part of that.

Your IAT is high because the supercharger is hot and heats the air even while cruising.

Fueling is not derived from the AFR table, but from a VE or a pulse duration table.
The AFR table is just there to tell a controller to correct the fueling table in closed loop operation.

with your SC now operative, you first map the fuel map. An indication of this is if your fuel trims are close to 0%, say +-2%. Means your closed loop controller has hardly anything to do.

The ECU also adds fuel proportionally to boost. This works out pretty well if the base feeling is mapped right. also leave this alone.


It seems to me you really need to look into your ECU's operating manual and see how it works. There are several different strategies. Therefore it is hard to give you advice without even knowing what ECU it is, what mode it runs in, if it has a wideband sensor signal fed into the ECU, what the trim value actually means..... (trim can be a correction based on the average % of fuel trim based on a AFR table but could also means corrections based on correction tables, e.g. IAT, barometric pressure, coolant enrichment etc. . So all stuff completely outside of closed loop operation.
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