What octane gas does everyone use i use 93 but i put 84 or something like that and when i did that my max started driving like trash

william

 

yeah, 84 would make your car run pretty crappy especially since the normal lowest grade you can buy is 87

I always run 93, the car seems to run a little better with it (or maybe it's just a placebo but oh well) and I advanced my timing which you should run higher octane with

also, search for more info, this topic comes up every month or so

 

but on the week ends its 97 all the way I can tell the diff,little mo HP

 

i use 93 and octane boost every time i fill up!! when i want to race i put in 104 octane boost!!!it works!!

 

Where did you get the 84 octane gas? Mexico???

 

i didnt know which one it was but it was 89 and i went and filled it up wiht 93 today

 

two days ago i was bored and i put 116 octane in my car, it had tons of power, i only bought 2 gallons and then just put 92 in it, ran great, no hesitations at all.

 

I wonder if these "racing fuel" (I think anything over 100 octane is basically racing fuel) contains lead in them (i.e. not unleaded.) If so, they're harmful to the catalytic converter, are they not?

 

i heard putting high octane racing fuel in cars with a compression ratio not high enough would mess the engine up. i would think our cars wouldn't have a high enough compression. could be wrong though. anyone know about this?

 

i only put 93 but i want to put over 100 octane but can't seem to find it...

 

It won't do anything. The amount of Octane in gasoline basically sets the limits of detonation. You can certainly go too low, but never too high. It would just be a waste of money..woon't make more power. If the burn in the cylinder is as complete as physically possible with no detonation, then that is all you need. On a 9:1, 89 is usually enough. Warmer climates might need 93. No damage will occur from going higher though

 

Unless that high-octane fuel contains lead, of course.

 

Very true, unless you have no cat, then I believe no problems are likely. Engines designed for unleaded have hardened valve seats (lead acts as a lubricant on older pre-unleaded engines) and no cat (lead destroys it) but I don't think there is any real damage issue here. But it might clog fuel system components, don't you think?

 

Use 93 octane then a bottle of NOS brand octane booster. It can raise your octane by as much as 7 points...

 

really?? and if so which nos octane booster should i use and it won't cause any damage to the engine, right? where can i find this nos brand octane booster?? tHnax...

 

the 7 point boost is expensive. even the 3 point stuff is like, 5 bucks. but it's the best octane boost i've ever used, period. this stuff is awesome. you can get it at most auto places like autozone, pepboys, etc. i know walmart carried it around here once but i don't think they have it anymore. the street formula is 3 point, offroad is 5, and racing is 7. i think street costs 5, offroad 8, and i've not seen any racing around here so i'm not sure how much it costs.

 

thanx...

 

While on the topic, Here's an idea to kick around: octane boosters use volitile solvents like benzene, toluene, ethylene (ethyl alcohol) etc, that are relatively harsh compared to regular gasoline, in order to get the point boost. These solvents are similarto those found in the fuel injector cleaners we all are so tempted to throw in the tank every other oil change, right? Knowing the destructive nature of these cleaners on rubber seals and brass injector parts, isn't it reasonable to believe that octane boosters have the same detrimental effects on fuel systems with frequent use? Whaddaya think?

 

that's why my car ran so much better. must have cleaned out the injectors.

 

where do you guys.. justify that higher octane allows for more engine power?

i just dont even want to understand that reasoning.

 

yeah, it adds no hp at all. i put racing in my bike and all i noticed was just a touch of more throttle response.

 

That's probably due to the faster traveling flame front in the combustion chamber..knock is a result of a few things, but one major player is the ignition of the charge ahead of the flame front..due to compression of the unburned charge ahead of the expanding flame front as it travels about the chamber. High octane fuels burn a little faster, so the unburned charge ahead of the flame doesn't have enough time to ignite under localized compression. At least that is what I learned in a course I took..saw some special images showing the various stages of burn in the chamber and what happens when knock occurs..and why. Pretty cool stuff. I'll post the name of the book. It helped me understand more of the thermodynamics, mechanics and fluid dynamics involved. Sounds a lot more complicated than it really is. The pictures and diagrams and ttheir captions are as informative as the written text.