A&A on Ls6

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07-24-2014, 10:13 AM

#21

Pekka_Perkeles

Burning Brakes

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Quote:

Originally Posted by ajrothm

My stock 29k mile LS6 had 10-11 psi running through it for about 4k miles before the typical #5 & #7 pistons broke ring lands.. It did make 622rwhp on a completely stock engine other then headers/x pipe.

10 psi, 13* timing, 10.4 AFR on meth....(11.2 AFR without meth).... Broke pistons on meth...

Now, is that 13 degrees of advance a commanded timing or an actual timing? Burst knock active or perhaps disabled? IAT vs. Spark? ECT vs. Spark? Etc...

Was that AFR with or without possible positive LTFT's?

And finally, are you sure your meth system was running OK when the failure happened?

While AFR and ignition advance are nice things to know, it's really not enough regarding GM PCM tuning.

I don't want to open the can of worms, but without all the tune and log(s) details, that's the way I see it.

Again, just my opinion.