100 Octane
Originally Posted by sammyG350gt
dont kill me... but what about the "octane boosts" sold everywhere? I'm never tried the stuff but wouldnt it have the same effects as useing a higher octane fuel? besides knowing the exact mixture are there any different advantages to actually finding a high octane fuel at a far off distant gas station?
Originally Posted by DaveB
110 octane is most likely leaded. Pretty much any race fuel over 104 octane has lead in it to boost octane levels.
This is a case of too much of a good thing. Octane is a rating of the fuels resistance to burn. The higher the octane, the harder it is to burn. Without a super high compression, boost, etc, 100+ octane is overkill and chances are the car will make less power.
This is a case of too much of a good thing. Octane is a rating of the fuels resistance to burn. The higher the octane, the harder it is to burn. Without a super high compression, boost, etc, 100+ octane is overkill and chances are the car will make less power.
dunno if that was 100% true, but thats what I been told.
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Joined: Sep 2005
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From: San Diego
Originally Posted by gary c
We'll never see that kinda gas in Ca. we're lucky to have 91 proof....haha
Racing gas is available at some stations but it's super hi-buck and not
worth running in my G. We haven't seen 100 octane since the days of
Chevron Custom Supreme........that's all I ever ran. It had so much led
content it would turn the inside of your exhaust tips a light gray color.
Racing gas is available at some stations but it's super hi-buck and not
worth running in my G. We haven't seen 100 octane since the days of
Chevron Custom Supreme........that's all I ever ran. It had so much led
content it would turn the inside of your exhaust tips a light gray color.
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Just FYI, if you car isn't tuned to use the higher octane fuel, you'll find the HP actually goes down slightly... (Contrary to popular belief, higher octane means less power, but a much more controlled burn rate).
You'll need to tune the ignition to increase and use tighter timing tables in order to gain an advantage -- tuning to have each power stroke hit on the leading edge ("sweet spot") of that controlled burn envelope will gain more effeciency so that you capture more power from the combustion even though the combustion itself may be a bit less powerful.
Keep in mind that you have to tune the timing tight to gain much that that you'd have to retune before putting the lower "premium" fuel (91-93 octane) back in or you'll be risking detonation and/or pinging which can start to cause damage real fast.
Overall, unless you can tune to take advantage of the higher octane fuel, you 'll see no difference in the best case, and possibly a slight decrease in power (though likely not noticable). Paying the extra $2.50-$4 per gallon isn't worth it
BTW - I do tune for my drag car with HP Tuners -- are there any similar packages for the 07 G? (Timing, A/F tables, etc)?
(Sorry for the rambling... It's new years and I'm not quite sober )
You'll need to tune the ignition to increase and use tighter timing tables in order to gain an advantage -- tuning to have each power stroke hit on the leading edge ("sweet spot") of that controlled burn envelope will gain more effeciency so that you capture more power from the combustion even though the combustion itself may be a bit less powerful.
Keep in mind that you have to tune the timing tight to gain much that that you'd have to retune before putting the lower "premium" fuel (91-93 octane) back in or you'll be risking detonation and/or pinging which can start to cause damage real fast.
Overall, unless you can tune to take advantage of the higher octane fuel, you 'll see no difference in the best case, and possibly a slight decrease in power (though likely not noticable). Paying the extra $2.50-$4 per gallon isn't worth it
BTW - I do tune for my drag car with HP Tuners -- are there any similar packages for the 07 G? (Timing, A/F tables, etc)?
(Sorry for the rambling... It's new years and I'm not quite sober
)
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