I"ve never been able to figure out a knock issue I have in my stock 86. Recently smogged, car is bone stock including chip currently. Boost currently at 12-13#.
On WOT runs from 0 or a slow roll I get blips on the Casper's knock gauge and KR readings (usually 2 or less) on the SM at WOT. It's all been very inconsistent however. Some runs I get nothing at all.
Tired TT chip for stock injectors and also tried 50s with a TT chip for 50s. No difference.
Usually run 91 octane, but I added equal amount 101 octane (so likely 96 octane) and still knocks no real difference.
Used stock FPR, but also tried boosting FP with an adjustable (to 45 line off) - no difference. (Has Walbro hot-wired fuel pump and confirmed that fuel pressure rises 1:1 with boost)
Exhaust not hitting, etc.
Watching the SM, the knock goes away if I stay in it. Last time I tested, I got two rounds of KR (0, 0, 0, 0, 0, 2.3, 0.7, 0, 0, 0, 0.9, 0, 0)
O2 MV reading are 750-850 when I hit the recall.
I"ve done a little testing with a WB O2 and my numbers are if anything rich. During a 0-60+ run AFR sits in the 9s, finally rising into the 10s at the end of the run.
Any thought?
Thanks.
On WOT runs from 0 or a slow roll I get blips on the Casper's knock gauge and KR readings (usually 2 or less) on the SM at WOT. It's all been very inconsistent however. Some runs I get nothing at all.
Tired TT chip for stock injectors and also tried 50s with a TT chip for 50s. No difference.
Usually run 91 octane, but I added equal amount 101 octane (so likely 96 octane) and still knocks no real difference.
Used stock FPR, but also tried boosting FP with an adjustable (to 45 line off) - no difference. (Has Walbro hot-wired fuel pump and confirmed that fuel pressure rises 1:1 with boost)
Exhaust not hitting, etc.
Watching the SM, the knock goes away if I stay in it. Last time I tested, I got two rounds of KR (0, 0, 0, 0, 0, 2.3, 0.7, 0, 0, 0, 0.9, 0, 0)
O2 MV reading are 750-850 when I hit the recall.
I"ve done a little testing with a WB O2 and my numbers are if anything rich. During a 0-60+ run AFR sits in the 9s, finally rising into the 10s at the end of the run.
Any thought?
Thanks.