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How to make (relatively) cheap octane boost/race fuel


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#1 joeg

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Posted January 28 - 04:00 PM

Go to sherman williams and ask for a 5gallon drum of "xylene"
last summer i got 5 gallons for $25... recently it was $35...

get a big bottle of marvel mystery oil and a bottle of ATF...


xylene is 118 octane, and the mmo and atf is to lubricate/clean...


if i'm not racing, i usually throw the 5 gallons in with about half a tank (8 gallons in my case)... and it cleans out the chamber and stuff and feels like you just bolted on a new piece of hardware... MAJOR seat of your pants difference....

obviously, if you're racing, use less gas, less xylene... unless you like racing with a full tank for some reason....


definately good stuff... you can use "Toluene" aswell, but its lower octane... 114 i think... but a little cheaper...

(toulene and xylene are the main components of any "octane booster" in stores, except you pay $5 for 16oz instead of a gallon....)
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#2 teklord310

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Posted January 28 - 04:52 PM

can someone who knows their shit comment on this??

I don't know enough, would be cool if this really worked.
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#3 teklord310

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Posted January 28 - 05:37 PM

Homebrew Gasoline Octane Boosters

--------------------------------------------------------------------------------
Editor's note: I would NOT suggest that a person use the following fuel mixtures without considering the detrimental effects on your engine, vital engine components (O2 sensor, etc), and other potential damage. That said, the information is interesting.
Original published in:

GS-Xtra
1213 Gornto Road
Valdosta, GA 31602
(912) 244-0577

Editor: Richard Lasetter, president Gran Sport Club of America (GSCA)

Formula #1 - Toluene
R+M/2.........114
Cost...........$2.50/gal
Mixtures with 92 Octane Premium
10%...........94.2 Octane
20%...........96.4 Octane
30%...........98.6 Octane
Notes: Common ingredient in Octane Boosters in a can. 12-16 ounces will only raise octane 2-3 *points*, i.e. from 92 to 92.3. Often costs $3-5 for 12-16 ounces, when it can be purchased for less than $3/gal at chemical supply houses or paint stores.

Formula #2 - Xylene
R+M/2.........117
Cost...........$2.75/gal
Mixtures with 92 Octane Premium
10%...........94.5 Octane
20%...........97.0 Octane
30%...........99.5 Octane
Notes: Similar to Toluene. 12-16 ounces will only raise octane 2-3 *points*, i.e. from 92 to 92.3. Usually mixed with Toluene and advertised as *race formula*.

Formula #3 - Methyl-tertiary-butyl-ether (MTBE)
R+M/2.........118
Cost...........$3.50/gal
Mixtures with 92 Octane Premium
10%...........94.6 Octane
20%...........97.2 Octane
30%...........99.8 Octane
Notes: Oxygenate. Very common in octane booster products. Has lower BTU content than toluene or xylene, but oxygenate effect makes the gasoline burn better and produce more energy.

Formula #4 - Methanol or Ethanol
R+M/2.........101
Cost...........$0.60 - $1.75/gal
Mixtures with 92 Octane Premium
10%...........94.3 Octane (Methanol)
10%...........94.7 Octane (Ethanol)
20%...........Not Recommended
Notes: Methanol is wood alcohol. Ethanol is grain alcohol and found in Gasohol in 10% ratios. Both alcohols are mildly corrosive and will eat gas tank linings, rubber and aluminum if used in excessive ratios. Main ingredient in "Gas Dryers", combine with water.

Formula #5 - Isopropyl Alcohol and Tertiary Butyl Alcohol
R+M/2.........101
Cost...........$0.60-$1.50/gal
Mixtures with 92 Octane Premium
10%...........94.5 Octane
20%...........Not Recommended
30%...........Not Recommended

Notes: Similar to Methanol/Ethanol. Isopropyl Alcohol is simply rubbing alcohol.

Sample Mixture
To make your own octane booster, it is easiest to make up a large batch, and then bottle it up in "dosage-size" uses.
Below is the basic formula of one of the popular octane booster products. To make eight 16 ounce bottles (128 oz = 1 gal):

100 oz of toluene for octane boost
25 oz of mineral spirits (cleaning agent)
3 oz of transmission fluid (lubricating agent)
This product is advertised as "octane booster with cleaning agent *and* lubricating agent!". Diesel fuel or kerosene can be substituted for mineral spirits and light turbine oil can be substituted for transmission fluid. Color can be added with petroleum dyes.

--------------------------------------------------------------------------------


That clarifies things a bit...

So what are the downsides. Kill your O2 sensor?
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#4 teklord310

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Posted January 28 - 05:50 PM

This site explains it all:

http://members.rennl...ketFuelFAQ.html

Definetely a very good read.
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#5 teklord310

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Posted January 28 - 06:23 PM

some more insight on a 944 guru, very very smart guy.



Also do not mix in anything other than xylene or toluene with your gas. Trying to replicate the mix of those little bottles of octane booster by adding ATF and mineral-spirits/thinner/solvents is pointless. The only reason those useless octane boosters adds those is because they use organometallics to enhance octane. Besides being highly carcinogenic and clogging your catalytic, these will create tons of harmful deposits inside your engine (might as well throw fishing weights down your spark-plug hole). The solvents try do dissolve these deposits before they build up too badly and the ATF lubricate your cylinder walls to help your rings slide over the deposits without too much damage. Just say NO to those little bottles of octane-boosting CR*P!

Since you're using pure hydrocarbons by adding xylene/toluene, this is a clean-burning mix and you don't need solvents & extra lube in your gas. In fact, xylene & toluene are the principal components in race-gas anyway.
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#6 joeg

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Posted January 28 - 06:41 PM

so wait... don't use atf and MMO???

i've always read that the MMO is what stops it from killing the o2 sensor... because it has minterals and things that normal gasoline does and xylene doesn't... and atf lubricates everything...
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#7 cintron

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Posted January 28 - 11:34 PM

the more shit you put in, the worse it gets.

let's just stop being lazy assholes. For the money you'll spend making your own homebrew and the trouble you'll go through mixing it, you midas well pick up C16 race gas and shove that in your tank. It's proven, it works and yes it is leaded i believe, so it will adversely affect your O2 but who cares.

These fuels will not provide more power necessarily by themselves, but will increase the detonation threshold and prevent the car from visiting the knock sensor as much during timing advance. Hence, on a hot summer day, running high boost with C16 in the tank may prevent knock so that decent ignition advance (and hence power) can be made. Again, it depends highly on your engine's state of tune.

Gratuitous intercooling and proper ignition/fuel mapping will make the most of high octane gas. The better the intercooling, the less the need to use higher octanes to keep the combustion chamber temps down..
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#8 joeg

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Posted January 29 - 12:43 AM

well yeah, i should have noted i have a turbo car, and i probably have a high knock count seeing as how i haven't tuned it yet... so the xylene probably got rid of my knock....
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#9 teklord310

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Posted January 29 - 09:39 AM

Originally posted by joeg
well yeah, i should have noted i have a turbo car, and i probably have a high knock count seeing as how i haven't tuned it yet... so the xylene probably got rid of my knock....



I think everyone knows that already... But last I checked you were running stock boost no?? Gotta invest in a knock sensor on the 944. That and a wideband O2 and i'm set.
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#10 atomicapples

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Posted January 29 - 02:54 PM

i would just go get some 101 octane gas...


and im good to go.

if not. why not get 94 and get some octane booster?
bring it back a notch...

glow..the whole room was lookin for u all night..eheh...it was hella funny..especially with qouth pretendin to b joeg.. i was pissin on myself


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#11 teklord310

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Posted January 29 - 03:51 PM

Originally posted by atomicapples
i would just go get some 101 octane gas...


and im good to go.

if not. why not get 94 and get some octane booster?



How much is 101? like $4 a gal?
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#12 joeg

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Posted January 29 - 03:59 PM

Originally posted by teklord310
I think everyone knows that already... But last I checked you were running stock boost no?? Gotta invest in a knock sensor on the 944. That and a wideband O2 and i'm set.




nah, i'm running around 15-16psi.... (i took out the BCS restrictor)
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#13 cintron

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Posted January 29 - 05:45 PM

15-16psi on a T25? Dead Turbo.

go get a bigger one. ;)
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#14 joeg

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Posted January 29 - 06:11 PM

Originally posted by cintron
15-16psi on a T25? Dead Turbo.

go get a bigger one. ;)




nah, it supports 17 and sometimes 18 efficiently (yes, that word is used loosely)... thats what all the t-25 guys run on dsms... anything above that is hot air and a broken turbo...

but yeah, i want a bigger one
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#15 barslut

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Posted January 29 - 08:07 PM

40 bucks , 10 gallons at skspeed , chemistry scares me too much to start mixing shit.
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#16 joeg

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Posted January 29 - 09:47 PM

Originally posted by barslut
40 bucks , 10 gallons at skspeed , chemistry scares me too much to start mixing shit.



10 gallons of what??? :confsued:

skspeed.com?
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#17 barslut

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Posted January 29 - 10:29 PM

101 octane.
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#18 cintron

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Posted January 29 - 11:56 PM

the day i'm doing a dyno shootout or am running an insanely large Snail, high boost levels and wicked timing advance, then i'll use 100+ octane.

till then, 94 is fine. Who am I kiddng, my car is stock.
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#19 atomicapples

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Posted January 30 - 09:02 AM

diesel for life.

my motor is ran on coal
bring it back a notch...

glow..the whole room was lookin for u all night..eheh...it was hella funny..especially with qouth pretendin to b joeg.. i was pissin on myself


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#20 teklord310

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Posted February 04 - 12:47 AM

time to invest in a knock guage.
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