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Author Topic:   what is the best octane booster!
rickb33
Dirt Full Roller

Total posts: 46
posted January 10, 2003 08:05 AM
i have to mix it with regular super unleaded.91

dode
Dirt Freak

Total posts: 417
posted January 10, 2003 08:16 AM UIN: 13209501
Mix your own...much cheaper that way, and you can do it with stuff from the hardware store.

John

rickb33
Dirt Full Roller

Total posts: 46
posted January 10, 2003 08:10 PM
how,and what do i mix?

ford5
Dirt Freak

Total posts: 298
posted January 10, 2003 08:31 PM
pure toluene

trey_#23
Dirt Maniac

Total posts: 141
posted January 10, 2003 09:24 PM UIN: 348044304
How much octane does it add

loojack
Dirt Maniac

Total posts: 133
posted January 11, 2003 04:35 AM
A bunch, it's the last "T" in TNT (trinitrotoluene).

ford5
Dirt Freak

Total posts: 298
posted January 11, 2003 06:43 AM
if any body is interested i have a friend that has a few 55 gallon barrels of toluene they are sealed up and they are U.S. Army surplus. there is potential here to mix a huge amount of your own concoction of racing gas.............cheap too let me know he would be glad to move them......dont tell your insurance man you have them..............LOL ford5

bryanb30
Dirt Forum Racer

Total posts: 98
posted January 11, 2003 08:51 AM
well whats the recipe for this stuff?

dode
Dirt Freak

Total posts: 417
posted January 11, 2003 01:30 PM UIN: 13209501
what octane do you need?

John

bryanb30
Dirt Forum Racer

Total posts: 98
posted January 11, 2003 05:52 PM
im gonna be running in a hobbystock class and my motor is mostly stock except for a 480 lift cam, 882 heads, cast iron intake, headers and a holley500, have plans for some better heads later though..

loojack
Dirt Maniac

Total posts: 133
posted January 12, 2003 08:11 AM
I remember reading someplace too muck octane can hurt performance. Has anyone else heard this? loojack..

outlawstock17
Dirt Forum Champ
Total posts: 620
posted January 12, 2003 08:43 AM
yes, too much octane can hurt an engines performance. the higher the octane rating, the more heat is required for combustion. a low compression engine doesn't generate enough heat to fully combust a high octane fuel mixture, thus lowering power output.


UFnARacing
Dirt Full Roller

Total posts: 68
posted January 12, 2003 10:28 AM
Having a turbo Grand National, I've run into the problem of spending too much money on high octane fuel myself. I use Xylene at a 3 gallons gas to 1 gallon Xylene ratio, I believe this comes out to about 100 octane, if your mixing gas is 93 octane. I believe tolulene and Xylene are pretty close to the same thing.

Hope this helps some,
Randy

DMS CEO
Dirt Freak

Total posts: 212
posted January 16, 2003 12:02 PM
add a gallon of toluene to your fuel it will step it up...If you are scared of it add some Marvel mystery oil(cap full)to it to take out the bad stuff. Use the hottest plugs you can get though.

[This message has been edited by DMS CEO (edited January 16, 2003).]

Scoot
Dirt Freak

Total posts: 330
posted January 16, 2003 06:51 PM
I'm thinking about using aviation fuel in my car this year. I was told the octane was about 130? and the price was about $2.80 a gallon. What compression ratio would I have to run to not have any problems? Or could I mix in a different octane to knock it down?

------------------
Scoot
Smith Racing Team
870-365-5989

dode
Dirt Freak

Total posts: 417
posted January 16, 2003 06:55 PM UIN: 13209501
I suggest not running aviation fuel...it isn't all that great of stuff really.

John

superdave
Dirt Forum Racer

Total posts: 89
posted January 16, 2003 07:46 PM
All this stuff people are using is real poisen. Just mix about 25% racing gas or leaded aviation fuel. Even 100 lowlead aviation fuel has more lead that pump gas. It's more than enough to prevent detonation and that's all you need the octane for.

------------------
Superdave
www.salinaspeedway.com

outlawstock17
Dirt Forum Champ
Total posts: 620
posted January 16, 2003 08:42 PM
there's nothing wrong with running AV gas in your racecar. i just read an article about it one of the magazines. superdave is right. low lead for an aircraft engine is not low lead for an automotive engine.

spanky43
Dirt Roller

Total posts: 22
posted January 17, 2003 12:07 AM
i use 50/50 mixture 93 unleaded and 100 lowlead av gas along with a pint of marvel mystery oil to ten gallons for addition valve lube. I run a 355 sbc with 9.35:1 ratio and a crane .537 solid lift cam and 64cc 2.02 heads and hot autolite plugs and works great with opened up 500 cfm holly 2bbl. a chemist told me that the octane should be around 96 or 97

redneck racing
Dirt Freak

Total posts: 276
posted January 18, 2003 09:28 AM
I havent tried it yet but i know alot of guys are using the av gas with about 3oz of Marvel mystery oil in 5 gallons of fuel to lube the motor they also say to run a colder plug such as the AC R43 or the R43t. Hope this helps Eddie

nw15x
Dirt Full Roller

Total posts: 42
posted January 18, 2003 01:01 PM
AV GAS has a lower specific gravity than regular racing gasoline...therefore you are going to have to jet up to use it.

r19v
Dirt Roller

Total posts: 19
posted January 18, 2003 08:57 PM
Being in the fuel business (not a chemist) and a racer also, maybe I can shed some light on this. Outlawstock17 and RacerDave are correct. Octane does absolutely nothing to increase performance, and too much octane can hurt performance. Octane rating is a anti-knock (detonation) rating and has nothing to do with power. Use only as high a octane fuel as you need to prevent detonation. Higher octane fuel burns colder and needs higher compression to burn properly. If you want a power increase add nitormethane. Nitro creats oxygen when it burns. Careful though, if you add to much nitro, you could blow the heads off. Nitro needs to be used in a somewhat lower compression engine. Top fuel dragsters used to use 100% nitro, however these days I think they use about 95% nitro. (rules). For some good reading on fuels, their octane ratings and what octane to use with what compression ratio go to http://www.vpracingfuels.com it will probably answer most of your questions about what octane to use with what compression ratio. Sorry about this being so long, but hope it helps.

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