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post #1 of 8 (permalink) Old 06-14-2017, 06:12 AM Thread Starter
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Octane!

I see a lot of post asking about running 87 in your tank. I run 93 myself. What I wanna know is how much octane these can handle without any pcm tunes or engine damage. I've heard of people using 94. I'm curious how would 100 octane do?. Only mods are catless downpipe and shorty header, stock tune. I just like to get the most outta what I have
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post #2 of 8 (permalink) Old 06-14-2017, 07:30 AM
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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.

Example:

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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post #3 of 8 (permalink) Old 06-14-2017, 12:00 PM
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Don't go lower than 90
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post #4 of 8 (permalink) Old 06-14-2017, 12:18 PM
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Quote:
Originally Posted by CRAK View Post
I see a lot of post asking about running 87 in your tank. I run 93 myself. What I wanna know is how much octane these can handle without any pcm tunes or engine damage. I've heard of people using 94. I'm curious how would 100 octane do?. Only mods are catless downpipe and shorty header, stock tune. I just like to get the most outta what I have

I was interested in this subject as well because I was having some issues with the common codes and my IRL was off in the performance area
so I have used 92 or 93 with my GM stage 2.


it is interesting that there are some forum members using 87 with 100K-200K miles of use and I think they said that the GM stage 3 was good for 100 octane gasoline
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post #5 of 8 (permalink) Old 06-14-2017, 05:12 PM Thread Starter
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Definitely don't wanna play games at 400hp either. I do plan on injectors, pulley, dual pass plate, etc. I was just seeing if it was worth while at a close to stock engine.
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post #6 of 8 (permalink) Old 06-17-2017, 07:42 AM
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Per GM: Stage 3 takes horsepower output to 248 on 93 octane fuel and to 260 horsepower on 100 octane fuel.

2006 Ion Red Line- 270whp/242wtq
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post #7 of 8 (permalink) Old 06-17-2017, 09:45 AM Thread Starter
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Per GM: Stage 3 takes horsepower output to 248 on 93 octane fuel and to 260 horsepower on 100 octane fuel.
so from everything I've gathered anything above 93 unless tuned is pretty much a waste of time and money. Appreciate all the input!
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post #8 of 8 (permalink) Old 06-19-2017, 11:42 AM
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Quote:
Originally Posted by CRAK View Post
so from everything I've gathered anything above 93 unless tuned is pretty much a waste of time and money. Appreciate all the input!


according to GM performance, gm3 has a rough aggressive idle which imo makes for a bit more fun of a ride


so it could be worth it
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