Home Made Race Gas Calculations

[Kyle87T]

I am very interested in finding out what kind of octane I can make on various amounts of Toluene or Xylene. I did some calculations, which should be pretty straight forward. I am very excited to try this when spring rolls around.

Here is what I calculated:

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Toluene - 114 Octane
Xylene - 117 Octane


Here's the math:

(A x Gas Octane) + (B x 114 or 117) / (A + B) = Octane Value

A = Gallons/Litres of Gas
B = Gallons/Litres of Toluene/Xylene
114 = Octane Value of Toluene
117 = Octane Value of Xylene



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MEASUREMENTS IN GALLONS


1/4 Tank = 4.6GAL

5% Toluene/Xylene = 0.23GAL + (4.37GAL of Gas)
10% Toluene/Xylene = 0.5GAL + (4.1GAL of Gas)
20% Toluene/Xylene = 0.9GAL + (3.7GAL of Gas)
30% Toluene/Xylene = 1.4GAL + (3.2GAL of Gas)
40% Toluene/Xylene = 1.8GAL + (2.8GAL of Gas)
50% Toluene/Xylene = 2.3GAL + (2.3GAL of Gas)

1/2 Tank = 9.3GAL

5% Toluene/Xylene = 0.47GAL + (8.83GAL of Gas)
10% Toluene/Xylene = 0.9GAL + (8.4GAL of Gas)
20% Toluene/Xylene = 1.9GAL + (7.4GAL of Gas)
30% Toluene/Xylene = 2.8GAL + (6.5GAL of Gas)
40% Toluene/Xylene = 3.7GAL + (5.6GAL of Gas)
50% Toluene/Xylene = 4.7GAL + (4.65GAL of Gas)

3/4 Tank = 13.8GAL

5% Toluene/Xylene = 0.69GAL + (13.11GAL of Gas)
10% Toluene/Xylene = 1.38GAL + (12.42GAL of Gas)
20% Toluene/Xylene = 2.76GAL + (11.04GAL of Gas)
30% Toluene/Xylene = 4.1GAL + (9.7GAL of Gas)
40% Toluene/Xylene = 5.52GAL + (8.28GAL of Gas)
50% Toluene/Xylene = 6.9GAL + (6.9GAL of Gas)

Full Tank = 18.5GAL

5% Toluene/Xylene = 0.9GAL + (17.6GAL of Gas)
10% Toluene/Xylene = 1.9GAL + (16.6GAL of Gas)
20% Toluene/Xylene = 3.7GAL + (14.8GAL of Gas)
30% Toluene/Xylene = 5.6GAL + (12.9GAL of Gas)
40% Toluene/Xylene = 7.4GAL + (11.1GAL of Gas)
50% Toluene/Xylene = 9.25GAL + (9.25GAL of Gas)






MEASUREMENTS IN LITRES


1/4 Tank = 17.5L

5% Toluene/Xylene = 0.88L + (16.62L of Gas)
10% Toluene/Xylene = 1.75L + (15.75L of Gas)
20% Toluene/Xylene = 3.5L + (14L of Gas)
30% Toluene/Xylene = 5.25L + (12.25L of Gas)
40% Toluene/Xylene = 7L + (10.5L of Gas)
50% Toluene/Xylene = 8.75L + (8.75L of Gas)

1/2 Tank = 35L

5% Toluene/Xylene = 1.75L + (33.25L of Gas)
10% Toluene/Xylene = 2.5L + (32.5L of Gas)
20% Toluene/Xylene = 7L + (28L of Gas)
30% Toluene/Xylene = 10.5L + (24.5L of Gas)
40% Toluene/Xylene = 14L + (21L of Gas)
50% Toluene/Xylene = 17.5L + (17.5L of Gas)

3/4 Tank = 52.5L

5% Toluene/Xylene = 2.63L + (49.87L of Gas)
10% Toluene/Xylene = 5.25L + (47.25L of Gas)
20% Toluene/Xylene = 10.5L + (42L of Gas)
30% Toluene/Xylene = 15.8L + (36.7L of Gas)
40% Toluene/Xylene = 21L + (31.5L of Gas)
50% Toluene/Xylene = 26.3L + (26.2L of Gas)

Full Tank = 70L

5% Toluene/Xylene = 3.5L + (66.5L of Gas)
10% Toluene/Xylene = 7L + (63L of Gas)
20% Toluene/Xylene = 14L + (56L of Gas)
30% Toluene/Xylene = 21L + (49L of Gas)
40% Toluene/Xylene = 28L + (42L of Gas)
50% Toluene/Xylene = 35L + (35L of Gas)






ACTUAL INCREASE USING 91 PUMP GAS


Toluene
5% Toluene = 92.15 Octane
10% Toluene = 93.3 Octane
20% Toluene = 95.6 Octane
30% Toluene = 97.9 Octane
40% Toluene = 100.2 Octane
50% Toluene = 102.5 Octane

Xylene
5% Xylene = 92.30 Octane
10% Xylene = 93.6 Octane
20% Xylene = 96.2 Octane
30% Xylene = 98.8 Octane
40% Xylene = 101.4 Octane
50% Xylene = 104 Octane





ACTUAL INCREASE USING 92 PUMP GAS


Toluene
5% Toluene = 93.1 Octane
10% Toluene = 94.2 Octane
20% Toluene = 96.4 Octane
30% Toluene = 98.6 Octane
40% Toluene = 100.8 Octane
50% Toluene = 103 Octane

Xylene
5% Xylene = 93.25 Octane
10% Xylene = 94.5 Octane
20% Xylene = 97 Octane
30% Xylene = 99.5 Octane
40% Xylene = 102 Octane
50% Xylene = 104.5 Octane






ACTUAL INCREASE USING 93 PUMP GAS

Toluene
5% Toluene = 94.05 Octane
10% Toluene = 95.1 Octane
20% Toluene = 97.2 Octane
30% Toluene = 99.3 Octane
40% Toluene = 101.4 Octane
50% Toluene = 103.5 Octane

Xylene
5% Xylene = 94.2 Octane
10% Xylene = 95.4 Octane
20% Xylene = 97.8 Octane
30% Xylene = 100.2 Octane
40% Xylene = 102.6 Octane
50% Xylene = 105 Octane







ACTUAL INCREASE USING 94 PUMP GAS

Toluene
5% Toluene = 95 Octane
10% Toluene = 96 Octane
20% Toluene = 98 Octane
30% Toluene = 100 Octane
40% Toluene = 102 Octane
50% Toluene = 104 Octane

Xylene
5% Xylene = 95.15 Octane
10% Xylene = 96.3 Octane
20% Xylene = 98.6 Octane
30% Xylene = 100.9 Octane
40% Xylene = 103.2 Octane
50% Xylene = 105.5 Octane

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* Note that if using Xylene, a lubricant for the gas tank is recommended. It is not neccessary to do this for Toluene.

* The Use of more than 50% of either additive is not recommended. Use more at your own risk.

* Recommended climate for Use of these products is 70*F/21*C. Any lower and you will start to have problems with cold starts.

 

[honestabe]

Very informative! I'll be sure to head your advice when I finally make it to the track.

Adam

 

[MDCmotorsports]

Kyle, IIRC you've done the math right.

Remember that toluene is just a carbon adder. It doesn't add oxygen into the mix. Because of this, it has a very slow burn rate compaired to gas. Why is this good? Think - anti knock, ping and preignition.

(From memory) Just fyi, the late 80's early 90's F1 cars made over a 1000hp out of a 2.5 litre turbo charged engine @ 40+psi.

 

[Zazzn]

oh believe me more then 50% is not good at all... lol I filled like 80% to get to the gas station.. almost didn't get there... she did not like running 80-90% lol

THey say if you have more then 30% you have a hard time starting the car in cold wheater....

 

[Kyle87T]

Ah thank you guys. Zazzn the cold start comment reminded me of something. Better add it to the "*" section .

 

[Kyle87T]

Kyle, IIRC you've done the math right.

Remember that toluene is just a carbon adder. It doesn't add oxygen into the mix. Because of this, it has a very slow burn rate compaired to gas. Why is this good? Think - anti knock, ping and preignition.

(From memory) Just fyi, the late 80's early 90's F1 cars made over a 1000hp out of a 2.5 litre turbo charged engine @ 40+psi.

Ya I did read that somewhere. That is an insane amount of boost. If I am not mistaken. They ran something like 90% Toluene and the 10% I am not sure about. I forget where I found that info.

 

[MDCmotorsports]

Eric is right. Tol doesn't like cold weather. You'll need some serious boost or added timing to make it ignite correctly when running more than 50%

 

[MDCmotorsports]

Ya I did read that somewhere. That is an insane amount of hp. If I am not mistaken. They ran something like 90% Toluene and the 10% I am not sure about. I forget where I found that info.

Well due to the rules, it was 90%. 10% was filler, typically race gas. It was the only fuel they could find on the plannet that wouldn't pre ignite under those conditions.

 

[Kyle87T]

Thaaatsss what it was.. "filler" was the word I was looking for.

Update, read the *Note section for comment on cold start. I actually read that from someone who does the mix often.