Does anyone know what a safe psi level should be for an RB20DET before it has pinging probs.
Internally stock but has HKS T3G and a HKS fin & tube cooler from a FJ20 that's not real big. Air temp at the butterfly when cruising will stay aroung ambient temp but start boosting and it can rise to 60 degrees with ambient being 25-30 degrees.
It pings when boost is at an indicated 17-18psi if it starts getting hot.
Other mods include APEXI a/f and i/t piggy backing a standard ECU however this engine doesn't seem to have a rev limit? 9000rpm still no cut???
Has Blitz dual stage boost control, Blitz BOV, R33 GTR fuel pump, HKS pod filter and 3 inch from turbo back with N1 muffler.
I always run Optimax and used a Octane booster aswell once, but still pinging when close to 20psi. Any knowledge on this problem would be greatly appreciated.