I was wondering if you can run race fuel in a fuel injected car. I know it plugs the cat, but what about fuel injectors? I have aftermarket inj's the motoron 60#'s and no cats. thanks

96 formula LT1 Vortech s/c, 7#'s, Hooker LT's, Magna flow cat back, th-350
4.10, pcm4less tune, MT drag radials.

 

Your injectors will be fine. Your 02 sensors will not be.

They make up to 110 octane unleaded.

 

I'm still looking for the elusive 110-octane ( (R+M)/2 ) unleaded. The most I have found is 105 (VP Fuels Motorsport 109). Some people confuse the VP Fuel C10 with 110-octane, but its only 100.


http://www.vpracingfuels.com/vp_01_fuels.html#unleaded
http://www.racegas.com/fuelspecs/default.asp

 

I thought Sunoco produced it, but it sure isnt on that list

 

What about mixing them?

I plan on running something above pump gas when I go to the track on spray.

Say 4 gallon of 91 and 1 Gallon of 110 leaded?

 

You have to average the numbers. You have (91+91+91+91+110)/5 = 94.8 octane.

As for 1 gallon of leaded fuel... Thats plenty to screw up your o2s.

 

Ya, I was wondering about the screwing the o2s part.

Does anyone make lead proof o2s? The reason I ask is just because mine have 120K on them and I am sure they will bight the dust anytime. Probably inaccurate as it is.

 

Don't sweat it unless you plan on running 110-112 leaded daily. Every time I run my car on n2o I put 5gallons of 110 or C12 whatever is available and mix it with about, less than 1/4 tank, 2-3galls of 93 already in the tank. I have changed 02 sensors once b/c I thought they were bad but it was something else. I run 200HP n2o with full timing and the above mixtures with great results, look at sig for details. Once I get home I go and put about 8-10galls of 93 and everything is fine. Later Clint

 

http://www.kemcooil.com/products.php?cId=4

This is from 1 of the sites sponsors.

 

Interesting, but what has tetraethyl lead octane booster got to do with the octane of unleaded fuel?

 

so would a 50/50 mix be ok for one night of racing, and then go back to premium?

 

Yes, it will be fine.

 

mixing 4 gallons of 91 unleaded with one gallon of 110 does NOT equal 94.8 octane because one cannot do a simple add the 5 gallons & average them with leaded fuel being in the mix. It has a synergistic effect toward boosting octane. That's the reason why back up til the late 80's one could mix 89 octane LEADED regular with 92/93 octane unleaded and actually get 95 octane fuel. The actual octane of this proposed mix would probably be around 98+ octane. Get lead resistant O2 sensors from NGK or Denso & you will be good to go for leaded on the weekends and no-lead during the week.

 

The way that the octane system was devised is based on the fact that some hydrocarbons burn more "smoothly" than others. Heptane which is a linear chain with 7 carbon atoms has a 0 octane rating because it reacts violently when burned and can combust without spark if it is compressed enough. 2,2,4-Trimethylpentane is a 8 carbon (octane) branched chain molecule. That is the "ideal" automotive fuel with a 100 octane rating. For the octane inbetween, for example 87 octane, are rated by their performance in relation to those two molecules. 87 octane performs similarly to a mixture composed of 87% 2,2,4-Trimethylpentane and 13% n-Heptane.

For octane ratings over 100 I don't know how it works... What is the (R+M/2) method? I never learned what that meant...

 

I did a bit of research last year and made a few calls and there is nowhere near a substantial amount of lead in these fuels needed to screw up an o2 sensor. its like .05 percent or something