12's
15+ Year Contributor
- 131
- 3
- Apr 5, 2004
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2 ahead of WATUGOT,
Minnesota
I just started tuning my new setup which include a PTE 50 trim, PTE 780cc injectors, FMIC, 2g MAS, walbo 255 hp, and a buschur AFPR (also have supporting mods). I took my car out for some tuning and the mbc is set to 18 psi. I log my car and timing climbs to 22-21-19-20-21 in higher rpm(yeah its dropping a bit). Knock on the other hand is really high (~30 counts all the way through). My 02's say ~.90 (leaner than normal). On the SAFC, my settings are -20 on high throttle. What would cause bad knock like that and decent timing? I know timing isn't that great but I mean it is so high for how much I am knocking. Do I need to adjust my fuel pressure or something? What should it be set at with the vaccum line on and the car running? Any ideas? Something really seems off. I should still be negative quite a bit with the 780's right? I stopped adjusting the SAFC because I thought I would have to get close to 0 on the SAFC to help. My fuel pressure is higher than normal as I used it to help my old 550's out on my 16g (avoid fuel cut). Thanks in advance.