i just did a pi headswap on my car about 6 months ago... and ive been running 92 or higher octane in it with no problems....but i was wondering if i could get away with running 89 octane??
btw i have a 160 degree thermostat
thnks for any info
If you haven't advanced the timing, you can try a lower octane (although the PI swap results in a slightly higher compression than a reg. PI motor). I would do a half tank and see if you get pinging.
If you do, you would be better off going back to the super.
unless your commute to work is at least an hour long mostly sitting in traffic with the a/c on or you're at wot between every light the engine isn't getting near hot enough, and even then
The PCM operates at its maximum performance at normal operating temp with the 190^ Tstat. Therefore the car will run its best with the stock Tstat. I would keep it that way.