sonicnofadz
15+ Year Contributor
- 782
- 13
- Sep 12, 2003
-
Baltimore,
Maryland
I don't think this is very normal. I was always under the assumption that if you don't get any knock then timing advance will rise from around 5-8 degrees to around 20-25 degrees under hard acceleration. But according to my MMCD palm logger program Im getting 5-8 degrees at idle (which sounds pretty normal to me) and then while cruising they soar up to 20-40 degrees. WTF is going on? I'm also getting HUGE amounts of knock (at partial throttle mostly). My EGTs are NORMAL. I've just upgraded to 650cc injectors and a SAFCII (stock fpr, stock fuel pump, yeah yeah I know I'll have to upgrade both of these). On my SAFC I have to take away HUGE amounts of fuel in order not to run pig rich. My low throttle settings start at like -20 and end around -33, and my high throttle settings start around -26 and end around -40. I've heard that when operating so far from the zero fuel correction line that your timing becomes advanced by the ecu (I think because its seeing abnormally small amounts of air while cruising?). Could this be the cause? Are my SAFC settings so low that they are causing this wacked out advanced timing (and possible causing my crazy knock problems?). Maybe hacking up the MAS will help lean up things a bit and bring the whole curve farther up. NOTE: My knock sensor is brand new (has like 3 miles on it) so I know its not that, and I'm running an EVO16G @10psi.
