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BOOSTJUNKIEGSX

15+ Year Contributor
113
1
Jan 12, 2006
HILLSBOROUGH, New Jersey
Any opinions on how to better tune my afc. To get a good log i set my hi throttle to -18 across the entire board.. I kept hitting fuel cut and now its pulling w/o a problem. Suggestions of what and where to take fuel out?..

RPM, Timing, O2 1 Bank 1
1772.0, 11.0, 0.68
1868.0, 11.0, 0.42
1960.0, 10.0, 0.52
2088.0, 10.0, 0.24
2204.0, 13.0, 0.6
2336.0, 16.0, 0.66
2428.0, 16.0, 0.82
2576.0, 7.0, 0.92
2700.0, 8.0, 0.96
2864.0, 7.0, 0.98
3032.0, 5.0, 0.98
3224.0, 3.0, 0.98
3448.0, 3.0, 0.98
3700.0, 4.0, 0.98
3912.0, 5.0, 0.96
4200.0, 8.0, 0.98
4420.0, 8.0, 0.98
4676.0, 9.0, 0.98
4928.0, 9.0, 0.96
5044.0, 10.0, 0.96
5308.0, 10.0, 0.92
5644.0, 11.0, 0.92
5896.0, 15.0, 0.92
6144.0, 16.0, 0.92
6376.0, 17.0, 0.92
6596.0, 17.0, 0.92
 
looks like your knocking from 2500rpms to 3900 rpms, id add some fuel back in all the way up to 4000 rpms, start adding a % back at a time as you see that you need it


You want your timing to drop like it is doing at ## peak torque, but once it starts going back up it needs to move up steadily to your 16 or 17 degrees of timing.. when it starts going up and then drops back again its knocking, so you are too lean,,, you might want to go back to lik -16 across the board and then fine tune it so that your timing drops to 7 or 8 or so and then raises to 15~17... remember taking fuel away adds timing and adding it takes away timing (in theory)

but from the looks of it you almost got it there :thumb:
 
Did you actually do a boost leak test or just a visual test? Take out some fuel in the 2500-5000ish rpm range and see if it helps at all. A boost leak would cause your car to run even more on the rich side as well as cause your fuel cut.
 
Boost leak was done with care. I found i had a leak coming out the screw on my BOV and i fixed that along with my BISS screw. I took fuel out of the rpm area in which you suggested and it seemed to break up even more. I am going to get a wideband this weekend so i will have to wait till then to solve this problem... Any suggestions would still be appreciated and thanks for the help! :dsm:
 
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