I finally took it to the track

[Bird_Of_Prey]

Re: I finally took it to the track

The cylinder pressure is so much lower at altitude motors don't need the higher octane like they do at sea level. The lower octane fuel is also cheaper to make.

That doesn't make sense though. Jet A is over 100 octane, and that probably involves much more altitude than Colorado. See my point?

[bigbrian442]

Re: I finally took it to the track

That doesn't make sense though. Jet A is over 100 octane, and that probably involves much more altitude than Colorado. See my point?

Quoted from Wikipedia on Octane Rating

entire article


http://en.wikipedia.org/wiki/Octane_rating


United States, in the Rocky Mountain (high altitude) states, 85 AKI is the minimum octane, and 91 AKI is the maximum octane available in fuel. The reason for this is that in higher-altitude areas, a typical naturally-aspirated engine draws in less air mass per cycle due to the reduced density of the atmosphere. This directly translates to less fuel and reduced absolute compression in the cylinder, therefore deterring knock. It is safe to fill up a carbureted car that normally takes 87 AKI fuel at sea level with 85 AKI fuel in the mountains, but at sea level the fuel may cause damage to the engine. A disadvantage to this strategy is that most turbocharged vehicles are unable to produce full power, even when using the "premium" 91 AKI fuel. In some east coast states, up to 94 AKI is available [1]. In parts of the Midwest (primarily Minnesota, Iowa, Illinois and Missouri) ethanol based E-85 fuel with 105 AKI is available [2]. Often, filling stations near US racing tracks will offer higher octane levels such as 100 AKI. California fuel stations will offer 87, 89, and 91 AKI octane fuels, and at some stations, 100 AKI or higher octane, sold as racing fuel. Until summer 2001 before the phase-out of methyl tert-butyl ether aka MTBE as an octane enhancer additive, 92 AKI was offered in lieu of 91.

[pace2006]

Re: I finally took it to the track

The cylinder pressure is so much lower at altitude motors don't need the higher octane like they do at sea level. The lower octane fuel is also cheaper to make.

Learn something new every day. :)

[VF1Skullangel]

Re: I finally took it to the track

Colorado and other high altitude areas get to have the ****ty grades of gas. Not sure why they can't source better.

We also have 87 and 91.

I never use them, I run 85 in both of my cars.:banana: I really didn't think there was much of a difference in the fuel.

Ill try some 87 next month when I go out to the track.

[Bird_Of_Prey]

Re: I finally took it to the track

We also have 87 and 91.

I never use them, I run 85 in both of my cars.:banana: I really didn't think there was much of a difference in the fuel.

Ill try some 87 next month when I go out to the track.

This is why you have a low octane spark table and a high octane spark table.

[jnxV6]

Re: I finally took it to the track

Quoted from Wikipedia on Octane Rating

entire article


http://en.wikipedia.org/wiki/Octane_rating


United States, in the Rocky Mountain (high altitude) states, 85 AKI is the minimum octane, and 91 AKI is the maximum octane available in fuel. The reason for this is that in higher-altitude areas, a typical naturally-aspirated engine draws in less air mass per cycle due to the reduced density of the atmosphere. This directly translates to less fuel and reduced absolute compression in the cylinder, therefore deterring knock. It is safe to fill up a carbureted car that normally takes 87 AKI fuel at sea level with 85 AKI fuel in the mountains, but at sea level the fuel may cause damage to the engine. A disadvantage to this strategy is that most turbocharged vehicles are unable to produce full power, even when using the "premium" 91 AKI fuel. In some east coast states, up to 94 AKI is available [1]. In parts of the Midwest (primarily Minnesota, Iowa, Illinois and Missouri) ethanol based E-85 fuel with 105 AKI is available [2]. Often, filling stations near US racing tracks will offer higher octane levels such as 100 AKI. California fuel stations will offer 87, 89, and 91 AKI octane fuels, and at some stations, 100 AKI or higher octane, sold as racing fuel. Until summer 2001 before the phase-out of methyl tert-butyl ether aka MTBE as an octane enhancer additive, 92 AKI was offered in lieu of 91.

Thanks for all your posts in this thread.

[chevy3504me]

Re: I finally took it to the track

Ive been cross country and notice I get better milage out of 93 (or highest possible octane sold). On the ls1 it also helps with the tick.

Im stickin to Shell 93

Do you have any performance shops in CO springs? things may be cheaper there, mod up and move out lol

[aalugo2000]

Re: I finally took it to the track

haha,
wow guys, alot of knowledge being dropped in this post!

i learned that a v6 camaro runs 17 sec quarters in pueblo in the summer, and thats not bad!

and that you can still get 85 octane gas in colorado... and its not bad either! haha

let me add to it... did you know they dont have cherry coke in canada.. if you ask anyone they just say "yea they tried it and it didnt work".

[VF1Skullangel]

Re: I finally took it to the track

Do you have any performance shops in CO springs? things may be cheaper there, mod up and move out lol

There is but nobody does good work out here and they over charge.:banana:

I recall the best local shop which I won't name a guy spent like close to 20k on a Supra and he's only making 600hp.:omg: Most places out here keep quoting me for turbo charger that exceeds the price of boosting an LT1!. Of course they always say get a V8 then turbo and that alone is telephone numbers to do.

If I plan on modding up it will be in another state.