zek Posted April 16, 2013 Report Share Posted April 16, 2013 I am attempting to tune accel enrichment on my twin screw supercharged BMW 330 and I am not having much luck. I am seeing a lean conditions of up to 22 AFR when apply the throttle at aything more than moderate amounts - it also happens when changing gear etc. The accel enrichment seems to stop the inital lean spike but drops of and this is where the spike occurs, I have tried various settings but it seems impossible to get something that works without making it really rich when driving normally. I think the problem stems from the fact I see 15 psi of instant boost the moment I open the throttle and it stays pretty constant throughtout the RPM range, only dropping of a little at high RPM. I imagine this is different to turbo / centrifugal setups which are more common. Does anyone have any pointers on how to tune for this type of scenario? there is not anything in the supplied base maps that seems to work. I am using TPS/MAP mode and have tried similar settings to many of the supplied basemaps. I know injection angle can affect this, so I am using 420 btdc at anything out of idle. Regards, Ben Quote Link to comment Share on other sites More sharing options...
JCE Posted April 20, 2013 Report Share Posted April 20, 2013 Send us your map. Sounds like something wrong with your fuel adjustments. You need to look at the map while driving. This way you can easily find the lean/rich spot in the map. Quote Link to comment Share on other sites More sharing options...
zek Posted April 20, 2013 Author Report Share Posted April 20, 2013 Thanks for the offer JCE, I think I am OK now as I went out last night and tried using MUCH larger accel sense / clamp values and this appeared to work very well. Ben Quote Link to comment Share on other sites More sharing options...
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