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Rated M Roadster · 12-15-2012, 03:14 AM

Not sure if it's a lack of pressure from the fuel pump just yet. I did some data logging on a couple runs and it appears that the injection timing is decreasing at a certain point causing the AFR to lean out. I'm not sure why the injection times would decrease; regardless of the pressure it seems the timing should continue to increase with the boost. Here are a couple graphs showing the decrease in injector timing and AFR change:

Z4m run3graph by M detaR, on Flickr

Z4M run4graph by M detaR, on Flickr

Z4M run5graph by M detaR, on Flickr

Hope to hear back from VF after the weekend.

EDIT: AFRs fixed...

Z4MrevAFR by M detaR, on Flickr

12-15-2012, 03:14 AM	#73
Rated M Roadster Captain 160 Rep 892 Posts Drives: F10 M5, i3, Z4M Join Date: Jun 2011 Location: PDX iTrader: (9)	Not sure if it's a lack of pressure from the fuel pump just yet. I did some data logging on a couple runs and it appears that the injection timing is decreasing at a certain point causing the AFR to lean out. I'm not sure why the injection times would decrease; regardless of the pressure it seems the timing should continue to increase with the boost. Here are a couple graphs showing the decrease in injector timing and AFR change: Z4m run3graph by M detaR, on Flickr Z4M run4graph by M detaR, on Flickr Z4M run5graph by M detaR, on Flickr Hope to hear back from VF after the weekend. EDIT: AFRs fixed... Z4MrevAFR by M detaR, on Flickr __________________ CURRENT ll F10 M5 l E85 Z4MR l I01 i3 REX SOLD ll E70 X5M l E85 Z4MR VF570 l E36/7 Z3MR l E36 328i Last edited by Rated M Roadster; 05-26-2013 at 05:16 PM..
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