I've recently been getting ping at 5500rpm and up, WOT, only 24 degrees total timing. It has done this a bit off and on for a while and i can't find a constant as it comes and goes. Aussie fuels are notoriously average so i put a lot of it down to that. Our 98 is more like your 92 or so. I throw some octane booster in for the drags. I'm thinking though that it's worsened by the timing curves?
Rolling up to say 3000rpm, 2nd gear before hitting the throttle the car runs near 40degrees as it's still factory timing down there. I'm wondering if that high initial timing "at the hit" so to speak can cause a little spike in cylinder pressure/temp etc?
Motor is an Ls1, 11.3/1 static, 236/242 hydraulic, ported factory heads, FAST manifold etc etc. 4500 stall TH350. 3.9 gear. 26inch tyre. AFR 12.8s. Air temp 50.
See attached log at 1min mark for the above described short pull. Minimal log channels as i'm suffering that bug where no matter what channels you send to MPVi2 it only logs the basics.Current best tune primary.hptLog-0024-6H8VTK69FYL514607.hpl