[RALVAREZ26]

hey guys i have a question regarding the type of gas that i use. a friend of mine said that since i have an sct tune that i should be using a higher octane! is that true, would it really make a diffrence?

[GTsetGO]

depends upon what they tuned it for. did they bump the timing at all in the tune??

if they did, you could get detonation and that is bad for the engine. nasty things could happen

[RALVAREZ26]

i'm going to have to find out, i've had it for a month like that now.

[dansgt]

i'd just use a higher octane just to be safe, all i ever run in any car i have is 91(top in ca) because overall its better for the engine.

[RALVAREZ26]

yeah, i think i'll do that! thanks guys

[TurboLX]

there's no need for a higher octane fuel unless your running boost or nitrous, etc... or if your timing is really advanced

i run 15* timing advance at 28psi on 108 octane

[sgrcltpunk]

well mid grade is good for stock low grade os never good for a mustang or any car for that matter high test is what i would run if you have anything done but you dont need 108 aka race gas till you get a high psi sc or some nitrous i also reomend buying a octane booster 1ce a month i use nitro power you can buy it at pepboys it claims 25 hp added instantly i dont beleve it but you do feel something

[rk_2000_Z/28]

What octane are you running right now? In any kind of performance v-8 I wouldn't use anything less than 91-93 (whatever is available in your area)

[dansgt]

Originally Posted by TurboLX there's no need for a higher octane fuel unless your running boost or nitrous, etc... or if your timing is really advanced i run 15* timing advance at 28psi on 108 octane

theres no need for it, but it is better for your engine. take any sort of engine class and you'll know this. octane is the resistance to burn, and you want the strongest, most acurate ignition on each stroke you can get(hence why its run when timing is advanced), low grade fuel will ignite easier and provides a weaker, less accurate ignition through the lower ignition point of the fuel. i'm not gonna go into great detail here as i'm very tired right now, but that should help someone understand.

[TurboLX]

what the hell are you saying??????????

I need to run high octane. if i run pump gas all im gonna be doing is having crazy detonation..... and the only way to fix that is to turn down the timing and boost and that will never happen

higher octane makes the pistons go up and down the bores straighter when under high pressure

[limited]

low otane= faster burn
high octane= slower burn
Detonation= fast uncontrolled burn(multiple flame fronts colliding)

[Boomer]

Originally Posted by limited low otane= faster burn high octane= slower burn Detonation= fast uncontrolled burn(multiple flame fronts colliding)

^^^^ What he said !!!!!

Preignition (detonation) can occur from higher combustion temperature that can be attributed to lower octane fuels.

[dansgt]

Originally Posted by TurboLX what the hell are you saying?????????? I need to run high octane. if i run pump gas all im gonna be doing is having crazy detonation..... and the only way to fix that is to turn down the timing and boost and that will never happen higher octane makes the pistons go up and down the bores straighter when under high pressure

read the quote before my post. my post was refering to stock, not modifyed.

[TurboLX]

but you quoted me

i was trying to say

[00redgt]

lol dam ppl just run whatever the hell you can afford,i get it for free so i run 93 if i had to pay i would buy 87 89 or 91,big dam deal as long as u dont run out of gas

[330CubeGt]

i did a 93 octane tune shut off the rear o2s and shut ff the egr and a few other things ,. i have always ran 93 but the tune oke it up big time.