104 octane fuel.. is it safe??

[gsrev]

I went to the track friday nite and was low on fuel and decided to put 3 gallons of 104 octane fuel.. damn that stuff is expensive. I knew I could bump of my timing so i went up to 16, do detenation heard. My times however stayed the same and i could not notice a difference w/ the increased timing. But my question is this.. is such a high octane content safe, they also had 112 and 114 but that was leaded gas. Question number 2.. w/ that high octane (104) is it safe to bump up timing in our cars to 20?? I tried to play it safe and only bumped it up to 16 for 2 passes, then i went down to 12.

[Mr Rogers]

104 is fineo long as it is the unleaded stuff. I usually run 1/2 tank of 100 and 1/2 tank of 92 on the street and just 100 at the track. I wouldn't try and turn it up to 20 unless you have at least a J&S but I would still be a little bit leary of cranking it up. 16 is fine and with the higher octane fuel it is also SAFE.

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98 GS-scR w/ 8psi JRSC, Walbro HO fuel pump, AEM cai, Airmass header, Thermal Exhaust, Skunk Works cam gears, J&S safeguard, Ground Controls and KYB AGX's, and of course to slow down, KVR X-drill F&R rotors and Carbon Kevlar pads and V1 to signal the slowing down and soon to go on a Carbon Fiber diet,RC 310 steriods,and new sticky foot wear of the 555R type

[rjaffey]

Even you don't get detonation, you can still run too much timing. If the mixture is ignited too early, peak cylinder pressure will occur too early and less power will result while the engine will see more stress.