[VegasZ]

Originally Posted by gd-bh

You may want to check out some rebel stations....I've seen some that have 100 octane at the pump.

You’re correct, that’s what I was considering race gas although maybe that’s not the correct terminology for the 100 octane. I do want to try a tank worth to see how much difference there is but I’ll probably wait till it’s warmer to get the full effect. Can I just run a full tank of it or should it be mixed 50/50 or something?

[arpad_m]

I use an octane booster (RaceGas) with my supercharged SS that has similar power to a stock ZL1. Gas sold here, although 93 octane, still isn't good enough to run without knock retard at WOT, I typically add just enough to raise it to 95-96 and that cleans it up completely. Anything lower than 93 must be even worse for performance.

That said, I try to be conservative with this, not being an expert and having read some caveats about MMT (methylcyclopentadienyl manganese tricarbonyl) that is in these boosters.

[Robster]

Originally Posted by Robster

5 gallons of 100 octane with the balance of the tank holding 91 octane averages out to about 93 to 94 octane.

http://www.bazellracefuels.com/Calcs/OC1.htm

[Buzzmanb12]

You can get AVGAS (100-116 Octane) at small local airports too.

[ZL1 1LE]

Originally Posted by DaveC113

93 isn't available in CO because supposedly 91 performs about the same at altitude, while not ideal it's not as bad as running 91 at sea level.

I haven't tried adding some 100 octane yet, but I plan on it...

Also, AFAIK Octane booster might only increase octane by a tiny amount, adding a can to 91 might not even get it to 91.5.

Originally Posted by LT4Greg

I would use the 91 octane and buy a bottle of Octane Boost from Advance Auto, Autozone or any parts store and call it a day!

I wouldn't bother with Octane Booster because as stated, it will only raise you up points of octane (e.g. 91 to 91.5). I do use Race Fuel Concentrate that raises you up numbers of octane (e.g. 91 to 95). It takes 10 points of octane to raise you up 1 number of octane.

[ssmofo]

Take your panties off and drive the friggen thing.

[7LitreC5]

It will run fine on 91. Altitude means less dense air, less cylinder pressure, and less max boost.

If you have E85 on the Western slope that could be an option as well if you add the sensor and get a tune. E85 is easy to get in the Colorado Springs area so it is what I run mine on.

Originally Posted by dbvettez06

The highest octane available in western Colorado is 91. I’m at 4500 feet elevation. Looking for a safe solution to maximize the performance in the Z.

[Brudda*Termite]

With your altitude, 91 is pretty much 93. I lived in New Mexico at anywhere from 5000-6000 feet altitude at all times, drove a Terminator Cobra with 20 lbs of boost and used 91 octane daily with zero problems...

[dbvettez06]

Originally Posted by Joshinator99

Can you run E85? Superior to 93 anyway.

Under warranty no.

[gd-bh]

Originally Posted by VegasZ

You’re correct, that’s what I was considering race gas although maybe that’s not the correct terminology for the 100 octane. I do want to try a tank worth to see how much difference there is but I’ll probably wait till it’s warmer to get the full effect. Can I just run a full tank of it or should it be mixed 50/50 or something?

check out the calculator in this thread...that'll help you figure out how to mix it to get the octane you want. It shouldn't hurt anything to run with a higher octane, but in "general" the wisdom is anything more than you need to avoid detonation is wasting money. And maybe even a tiny amount of power, as the higher octane number means it's harder to ignite the fuel, and you may not get as much fuel burn during the ignition phase.


I'd probably just run 1 gal of 100 for every 2 gal of 91, as there's no guarantee the pump rating is accurate.

[2SS Capt]

Originally Posted by gd-bh

You may want to check out some rebel stations....I've seen some that have 100 octane at the pump.

They do, it's $7.99/gal!

[Og Neon]

You are fine running 91 octane. Living out west I have done plenty of track days on 91. If the car is stock it will make all the timing adjustments and drive just fine.

[Markoz28]

Run 4oz of Boostane per fill up. 1 can should last about 8 fills.

[arpad_m]

Originally Posted by DaveC113

93 isn't available in CO because supposedly 91 performs about the same at altitude, while not ideal it's not as bad as running 91 at sea level.

I haven't tried adding some 100 octane yet, but I plan on it...

Also, AFAIK Octane booster might only increase octane by a tiny amount, adding a can to 91 might not even get it to 91.5.

Originally Posted by ZL1 1LE

I wouldn't bother with Octane Booster because as stated, it will only raise you up points of octane (e.g. 91 to 91.5). I do use Race Fuel Concentrate that raises you up numbers of octane (e.g. 91 to 95). It takes 10 points of octane to raise you up 1 number of octane.

I don't know where you guys are getting this information from, look at the blending chart for Race Gas below, other octane boosters I've seen were similar. The one I used did effectively help already when adding a minimal 16 ounces to 10 gallons of 93 gas, I have the data logs to prove.

It's extremely unlikely that product documentation pages are wrong and the infinitesimal octane increase you claim to be all that's possible with these products would still have eliminated knock for me.