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I currently have my car running on 93 octane. It’s a blow through turbo deal non intercooled. Looking to add a few gallons of something for protection down the track. There are so many fuels out there that I don’t know what I can get away with. I was considering just switching car over to e85 but It’s not available a lot around here and the car sees a good amount of street use.

How do I go about choosing which fuel to use? It’s a fuel injected motor.

Thanks guys.
 

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If you have an airport close, you may be able to get 100LL AV gas. It is 100 octane and cost about $4.00/ Gal. I have used it straight in my pump gas 582 BBC for years with no side effects.
 

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There is nothing better than Toluene, easily available and cheap too. Add 10% for medium boost, so that's 9 gallons of pump fuel and 1 gallon of Toluene. I've used it for nearly 20 years without a problem. It is fantastic stuff.
 

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I find this chart to be fairly useful. Cost wise, I'm convinced that you ought to be buying the very highest octane fuel you can easily acquire, if you are going to mix it with pump gas.



http://www.wallaceracing.com/octane-chart.php


Take care. Tom Worthington
But there are many who will say, not all fuels readily mix properly with pump fuels for such use.

Really, the simplest and safest for occasional use, and you know will not require any major tuning changes or concerns is a simple octane booster.
 

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Discussion Starter #8
Oh man I stopped checking this thread thinking it was a goner. Haha. So I am mainly just looking for added protection against detonation Incase intake air temps get crazy. Honestly, for the little bit I run, I don’t mind spending some money on fuel for the piece of mind that I will not grenade my motor.

Since posting this I ordered a Holley efi port injection set up, and plan to switch to full time e85 and adding a second meth nozzle. Once I get my new intake manifold and see what kind of room I have to work with I may end up going intercooled too depending on how far off my existing stuff is to fitting.

I wasn’t looking to add fuel for more power. So didnt plan on changing the tuning at all. My concern was I know certain fuels require a lot more quantity to run correctly. So I didn’t want to add a fuel to help against detonation and end up leaning it out.

I will look into octane boosters. To be honest I didn’t expect them to be recommended by anyone, didn’t know if they were snake oil or could add protection.
 

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Octane booster needs to say "Contains MMT" on the label. MMT is the active ingredient. Toluene is high octane but it attacks most rubber and plastic parts and will make them soften and swell. Don't use MMT with alcohols, methanol or ethanol or any other oxygenate.
 

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Toluene doesn't attack most rubbers and plastic parts and it doesn't make them soften or swell either (at least not up to 20% levels,which is basically C16) -in fact all pump gas has Toluene in it. Toluene is a bit more than just an octane booster, it also has more BTU's per pound of fuel than most other additives-more BTU's equals more power. With their huge budgets that meant they could have used any chemical - F1 and Group B cars used it- what does that tell you?
 

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Either do a meth injection or get a drum of VP ms100 it's 100 octane unleaded. A lot of fuels will not mix properly.
 

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Says who? The WRC F1A fuel -100octane max I believe? - IS made with extra Toluene added, I know because I used to buy my Toluene from a company who made the fuel.
I would have thought WRC and any such motorsport would have very tight rules these days about the fuel used, and wouldnt allow random adding and mixing of chemicals to the fuel.

I have used toluene in the past and found it very dirty. It would tend to produce black smoke, even when only say 10% was used, and also the engine oil would end up stinking of the stuff too.
One car we did use a pretty high percentage of the stuff along with methanol and petrol too. But now moving onto factory supplied fuels...there is no question it runs better and cleaner. Sadly a lot more expensive though.

But those things put me off it altogether.

Now maybe there are different types of "toluene", but this one was bought as like 99.xxx% toluene off a seller on ebay.
It was actually ridiculously cheap at the time and he even did free postage here, which was amazing lol.
 

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Yeah, a US gallon of C12 or C16 is around £20 at the track, an equivalent 20% Toluene mix is about £7 a UK gallon.
You can lean the AFR a bit because of the increased btu content of Toluene (we use the usual 11.5 ish), it also likes a fair bit of heat to burn cleanly and a bit more timing advance- it is very good in non intercooled combos. F1 back in the '80's used to duct hot air from the exhaust to the fuel tanks to warm the fuel to help it vapourise more easily.
We've not noticed any oil contamination using 20-50 Valvo VR1, (I don't know what you set your ring gaps to), and I've used it in high compression n/a, blown, turbo and 2 st/4st dirt bike combos over the past 20 years or so.
ps, a mixed batch of gas/Toluene doesn't like to sit for weeks in a vented fuel tank, we mix a fresh batch for each meeting and use the old in our lawnmowers.
 

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But there are many who will say, not all fuels readily mix properly with pump fuels for such use.

Really, the simplest and safest for occasional use, and you know will not require any major tuning changes or concerns is a simple octane booster.

I mix 4 gal of NON ethanol with 1 gal of 110 race gas to get 93.2 for 12 years in my 10.3 to 10.8-1 engines I have run. Plugs look terrific and read easily. When any of the engines were torn down pistons and walls look great.

Yes the Wallace racing site is awesome for the math.
 
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