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Old Jul 19, 2007 | 10:04 PM
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Default Gas Additive

Can I add 5 gal. of leaded racing fuel to a tank of gas without damaging emisions parts?
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Old Jul 19, 2007 | 10:05 PM
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No, It will ruin your cats.
Get 104 octane unleaded racing gas instead.
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Old Jul 19, 2007 | 10:07 PM
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Originally Posted by SunsetOrangeDream
No, It will ruin your cats.
Get 104 octane unleaded racing gas instead.
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Old Jul 20, 2007 | 12:01 AM
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Originally Posted by SunsetOrangeDream
No, It will ruin your cats.
Get 104 octane unleaded racing gas instead.
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Old Jul 20, 2007 | 12:17 AM
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Originally Posted by SunsetOrangeDream
No, It will ruin your cats.
Get 104 octane unleaded racing gas instead.
Or buy some Torco Unleaded.
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Old Jul 20, 2007 | 12:24 AM
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what octane do you need?

Are you running a 300 shot or big boost or what?

VP makes the highest octane unleaded, look at the motor octanes to compare fuels.

You can mix in a few gallons of xylene to raise octane safely, it is ~116 octane, and it is in all race fuels, but you can only mix it 30%

3x116=348
7x93= 651
358+651/10 and you get 99.9 octane

Better off to run straigt 100-109 unleaded, unless you needto drive and then mix at the track etc.
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Old Jul 20, 2007 | 01:15 AM
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wait, where do you buy 100 or 100+ octane fuel?? Highest I've ever seen at a pump was 94 I think.
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Old Jul 20, 2007 | 09:26 AM
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Originally Posted by SunsetOrangeDream
No, It will ruin your cats.
Get 104 octane unleaded racing gas instead.
Not an issue if you're CATless. Ahhh for the days of leaded gas

Last edited by JFTaylor; Jul 20, 2007 at 11:54 AM.
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Old Jul 20, 2007 | 10:36 AM
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Originally Posted by ccs1
Can I add 5 gal. of leaded racing fuel to a tank of gas without damaging emisions parts?
NO! The cats will be destroyed with any lead in the gas, even a gallon of leaded will do it. Plus, I believe, the O2 sensors. Get unleaded racing fuel.
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Old Jul 20, 2007 | 03:13 PM
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ok guys there is a 76 station on hwy 152 in los banos with 100 octane race gas is that ok? 7.49 / gal.
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Old Jul 20, 2007 | 04:45 PM
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I used to run 100 octane no lead in my supercharged 95 c4 vette,at the strip.
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Old Jul 20, 2007 | 07:18 PM
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Just had this conversation with a buddy of mine yesterday. Leaded will eat cats but if catless it will still ruin 02 sensors in a few gallons of leaded fuel.

My question is has anyone seen, via track times or dyno numbers, what power increase can be had with 100 octane unleaded race fuel in a C6? This of course would give great benefit to those boosted cars, but basic bolt on cars is the gain noticeable?
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Old Jul 21, 2007 | 10:15 PM
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Most tunes assume no more than 93 octane. Unless you tune to take advantage of it, added octane (detonation resistance) will not get you better performance.

And if you are gonna pour in paint store additives, use toluene. Nothing but carbon and hydrogen, so it won't foul you plugs, O2 sensors, CATS (if you have them) etc. Gasoline already contains some toluene, so you are just changing the ratio of the 114 octane part.
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Old Jul 23, 2007 | 11:09 AM
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I have no O2 sensors on my Uncatted Vette
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Old Jul 28, 2007 | 05:15 AM
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Its a misconception people have that you cant run leaded gas. There are some types of leaded gas that you cant run, a leaded gas with a bunch of additives will ruin your 02 sensors and clog your cats. But I have run lots of gallons of Sunoco M02X which is a leaded 112 in my Cobra and had zero issues. You could also run a leaded 116 from Sunoco which is called Maximal and that one is even better. Otherwise just get 100 or 104 unleaded.

Duman, you'll be fine with that 100 octane from 76. I didnt know they had 100 in LB
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