ANYONE KNOW OF A REALLY GOOD OCTAINE BOOST,, I HAVE A 454 LS7 W/12.5:1 COMP. RACING FUELS GETTING A LITTLE PRICEY.. AND WE CANT GO ON LONG TRIPS DUE TO A LACK OF AVAILABILTY... IVE HEARD SOME OF THIS STUFF CAN GUM-UP THE CARB.

All I can tell ya is that when they say it will raise Octane by "2 points" it means 0.2. A tenth of octane increse is called a "point" for example 93 to 93.2 would be your 2 "point" increase.

104+ is the best octane booster i ever used.i tried them all and always came back to the 104+ because it was hands down the best product.granted,this was several years ago and there may be something better on the market now.104+ makes a racing formula booster.i hope this helps.

Whats your timing set at?
..ditto on what Tom said..

My motor has right at 11:1's, It runs on pump gas with octane boost but it's so loud I don't think I could hear it pinging anyways. The motor just sounds a lot different(I know that sounds weird but it sounds different to me). I usually try to put 6 gallon of 110 3.85/gallon and the rest 92(highest I can find). That keeps the price down some. I would think it would be rather hard to ever run just pump gas and octane boost with 12.5:1 though, just my thoughts.

Please consider "Temco LEAD SUPREME 130" -Octane Boost.

It contains real TEL and can boost by numbers and not points!!

Or the homebrew stuff that consists of;

1 gallon of Toluene
1 quart of Diesel
1 pint of ATF

(3) batches of this in 10 gallons of 92 octane unleaded should put you up to about 97 octane!!

pdq67

Try a search on octane boost. I recall a website that tells you how to make your own. The stuff you buy in an auto parts store is a combination of Toulene(about96%)transmission fluid(about2%)and I think Alcohol(about2%).When they say 2 points that is .2%. You don't see a difference until you enrich the mixture approx 8%. So in ten gallons of fuel you would have to dump in 16 sixteen oz. bottles. You can make your own much cheaper. Toulene carries an octane rating of 114. So you can figure out how much you would need to raise 15 gallons of fuel from say 92 octane to 96 octane.If you mixed 2.5 gallons of toulene at 114 octane with 12.5 gallons of 92 octane pump gas you would end up with 15 gallons of 95.66 octane fuel. The transmission fluid is used as a lubricant and the other ingreadiant which I think is alcohol is used as a cleaner. Thats why the octane boost you buy in a store always says cleans and lubricates.

Would running a high octane race gas, say 114 octane, be bad on a car that needed around 98 octane? For a carbeurated engine.

Im just curious, but if you start with a gallon of 93 and mix with a gallon of 110, do you just average them and get 101.5 as your final octane rating?

If you mix leaded race gas and unleaded pump gas, you can't just average the two. The octane improvers in unleaded pump gas when mixed with the lead cause a non-linear increase in octane of the final product. This is per a conversation with a Unocal guy in their race gas booth on the Hot Rod Power Tour 3 years ago. I asked him what is the formula, and he replied you would have to test it to be sure. Too many variables with the amount of lead and type of unleaded octane improvers. Just know it's higher than a linear (avgeraging method) calculation.

Try this site to make your own


http://www.team.net/sol/tech/octane_b.html

I'm starting to wish I had gone with lower compression on this rebuild.

Originally posted by 71chevy0192:
Would running a high octane race gas, say 114 octane, be bad on a car that needed around 98 octane? For a carbeurated engine. the lower the octane fuel you run the better it is for a engine provided you stay away from dentonation........a higher octane fuel burns slower .........87 octane fuel burns at a faster rate then 100 octane.........

if your motor let say runs great on 98 octane with no other changes you put in 114 octane your car would run slower because the "explosion" is taking longer to fire completely....which in turns provides less of a push on the piston......now you might have something to gain if you can crank up your timming some more to start the burn ahead of time before you run into detonation.but in a case like this chances are you could keep turning up the timming and never gain nothing.

most given engine wont see any gains once you got the timming dialed into the motor on the lowest octane fuel that keeps it out of detonation. provide that this comment dont get out of hand with some one setting there timming at 28 degrees just to run 87 octane. i'm talking about saying running 91 octane at 36 degrees and the car dont run any faster with 38 or 40 degrees and it still dont detonate. which in this case it might be a good idea to try 89 octane.

same hold true going the other direction the car can only handle 34 degrees on 96 octane but you put in 100 octane and turn the timming up to 36 degrees and the car picks up and its not detonating.......so you try 38 degrees and the car detonates and falls off so you try 105 octane and the car picks up with with 38 degrees......so you try 40 degrees timming with 105 but the car doesnt go any faster but its not detonating..so you try 42 degrees and the car falls on its face even tho it still wasnt detonating.......well to me the sweet spot would be about 38 degrees with 105 octane.

Originally posted by 71chevy0192:
I'm starting to wish I had gone with lower compression on this rebuild. what is your engine combination...just wondering i have a 468 13 to 1 roller cam bbc that has 270 psi cranking compression and i drive around town with 93 octane pump fuel. i dont get on it or nothing because i know if i do i will be in trouble......but just making runs to here and there it does just fine.........on race days it gets a good dose of 114 fuel........

I'm running a 388ci with about 9.5:1 C/R...how much would I benefit, et wise, by running higher octane gas? I've never tried it, but would like to. I hear that there's a 76 gas station I think in Pasadena, or Covina that has 98 octane. What would be a good mixture of 98 and 91 be? gallon wise. Any other questions, please email me or leave a reply here...thanks a lot :D

Originally posted by LXS:
I'm running a 388ci with about 9.5:1 C/R...how much would I benefit, et wise, by running higher octane gas? I've never tried it, but would like to. I hear that there's a 76 gas station I think in Pasadena, or Covina that has 98 octane. What would be a good mixture of 98 and 91 be? gallon wise. Any other questions, please email me or leave a reply here...thanks a lot :D Why do you think you need higher than 91 in a 9.5:1 engine? What cam do you have in it? I run 91 in my 10.5:1 350.

I wish I could link you to the proof, however its also been shown that the engine will run best on the minimum octane level it requires.

PDQ, that's a neat brew there! I've yet to find anywhere that sells toluene. Reminds me to hunt around somemore.

[QUOTE]Originally posted by 427L88:
[QB] I wish I could link you to the proof, however its also been shown that the engine will run best on the minimum octane level it requires.

i agree here thats what i was trying to stress in my other post.........the lower the octane the faster it burns.........you want to burn that fuel as fast as you can to give a good push on the piston to make more power........why hinder the process with a slower burning fuel......like 114 octane..........the lower the number the better, provide you stay out of detonation(pinging,rattling,)

I went by Sherwin Williams Paint yesterday to check
out their Toluene price.

Ouch. $8.49 per gal...before tax.

I think I'll stick with VP 110 at $4.50 gal.

Emil Dusek
71Chevelle SS-502