Quote:
Originally Posted by Rated M Roadster
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. |
The injector timing seems to be the issue, perhaps related to fuel map parameters, assuming the engine is operating open loop. The injector timing peaks at 13ms at 6800RPM, it should continue on to about 14ms at 8000RPM, but instead drops to about 11.5ms open time.