J68 chip, who's running it, ok for 91 Octane??
 

Who runs the J68 chip? How does it compare to the J69 and J49? I'm curious because my chip is on it's way and i was expecting the J49 and JDM sent the J68. They said, "just be careful of detonation"....

:confused:

i tired the j69 with my truck and 92 octane, too much dentanation, so i went to the j49

I'm just trying to figure out why Jim at JDM would recommend me running the J68?.?.? I spoke with Justin earlier and he said the J49 would be the best choice, then i call later to find out they just shipped me the J68.

I'm just trying to figure out the reasoning, i wasn't able to talk to Jim about it.

I have the j68 and it runs great with 93..I would just try it,see if it pings..

Am i understanding correctly that the higher the number the more aggresive? Meaning, J49 is not that aggressive on up to the most aggressive J70 (or whatever it may be)?

How do I know which program my chip is? Man do I look stupid now!

It actually says it on the chip on a white sticker. There are a few numbers/letters that designate which it is, but the "J49" or whatever is what you're looking for.

Thanks!