Join Date: Dec 2015
Location: Central Alabama
Adding octane without changing the tune only makes your wallet lighter if you had no previous problems with knock.
Adding octane allows you to lean out the charge a bit and add timing. Timing makes power.
My M62 setup could only be pushed to about 16-17 degrees of timing on E10 93. On E85 ( 100 to 105 octane ), I had it at 25 degrees with no knock.
On my turbo setup, I was getting knock at 13-14 degrees on E10 93. Now I'm running 16 with no problems on E30 ( 96ish octane ). I have no idea how far I could push it with no knock on my current setup, and I'm not willing to try. 421whp is plenty.
TL;DR, use 93 if you don't have a method of tuning. Use E85 or a blend if you do.
2004 Saturn Ion Redline - S256ET | Ported Head
421whp/354wtq @ ~23psi on E30
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, Gone but not forgotten.