Well to add to all of that, if you don't have the compression to necessitate 93 octane then the tune for it is useless... The only thing you'll gain over a higher octane is being able to run more timing, and you can already run these engines at a very high advance with stock compression running 87 or 89. I've been able to run 28+ degrees with 87 in my car and that is 9.15:1 compression, Stock 3400 is only 9.5:1
Now if your were boosted I can understand the octane requirement, and or tune level. They will do that with boosted cars, and once again it simply means there is a bit less timing in the 91vs93 tunes, and quite possibly a little leaner too since with the timing drop you wont need it to be so rich to prevent detonation.
Now if your were boosted I can understand the octane requirement, and or tune level. They will do that with boosted cars, and once again it simply means there is a bit less timing in the 91vs93 tunes, and quite possibly a little leaner too since with the timing drop you wont need it to be so rich to prevent detonation.
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