Quote:
Originally Posted by 1FASTC32
steve, i don't think it is the pump or injectors, i have a steady 55 pounds all the way to redline...i think it is a tuning issue...do you have a wideband O2 on the car?
you can watch the car go from 12:1 A/F to 15:1 A/F in an instant right at 1.4 bar of boost...just food for thought...i am working on the tuning issue  |
In looking at the graphs above more closely, why are the top graphs showing 15:1 and the bottom showing a good 12.x to 1?
The reason why I think it is a pump or injector problem is that after I had my headers made, the car leaned out. I had it reprogrammed to add 10% more fuel through the entire RPM range. It worked at the lower RPMs but at 4500 rpm and higher, adding more fuel didn't have any impact on the A/F. The car ran the same as it did before the reprogram. I don't have a wideband O2 on the car. All of the A/F data was captured using a tailpipe sensor on a dyno. I haven't seen anything near 15 to 1 using the tailpipe sensor. I'll email you the before and after program data. Maybe you are right and it is a tuning issue. I hope it is.