Octane/booster What is everybody using? - Pontiac GTO Forum
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post #1 of 13 (permalink) Old 08-18-2015, 02:39 PM Thread Starter
 
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Octane/booster What is everybody using?

What octane rating are you using and additive booster for octane?
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post #2 of 13 (permalink) Old 08-18-2015, 04:55 PM
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I'm not using any... I think you'll find that adding enough of anything to actually make a difference is going to be horribly expensive. Tell us more about your engine/situation?

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post #3 of 13 (permalink) Old 08-18-2015, 07:21 PM
 
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Before I rebuilt the motor, I was buying 5 gals of 109 and blending it myself
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post #4 of 13 (permalink) Old 08-18-2015, 07:44 PM Thread Starter
 
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1968 428 3x2 10:1 comp street engine 3 angke valve 474 lift cam 296/302 dur
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post #5 of 13 (permalink) Old 08-18-2015, 08:31 PM
 
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You should be able to get by with a gallon of 108-112 racing gas per 10 gal of 93 octane. 2 gal would be better. Since your cam has that much advertised duration, it should keep your dynamic compression fairly low, as compared to one of the popular steep ramp cams. So, if you keep the timing advance down a little, and don't hammer on it, you might be able to get by on a good grade of 93.

In my 455 bracket engine, with #215 heads, I ran 2 gal of 108 with 3 gal of 93. It ran 7.30's in the 1/8 mile--no problems.

But racing gas is about $10 per gal. And most octane boosters don't add enuff octane to make a difference.
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post #6 of 13 (permalink) Old 08-21-2015, 12:55 PM
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I've used Octane Supreme 130 in my '65 and it works as good as blending race gas. The stuff is tetraethyl lead and is not street legal in my state, though. It does indeed work. None of the other octane boosters work...the 104 stuff, etc. The TEL130 Octane Supreme is expensive, though. Really no cheaper than mixing race gas. It is way more convenient.
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post #7 of 13 (permalink) Old 08-24-2015, 06:47 AM
 
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I mix the Octane Supreme 130 as well
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post #8 of 13 (permalink) Old 08-24-2015, 01:13 PM
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I just began using Octane Booster. Wild Bill answers all emails, if you have questions. This also has lead in it.

I had been using Lucas Ethanol Treatment for treating my gas (auto). Too soon to tell if any gains but according to my combustion ratio Bill confirmed I should be at 98 oct. I use 93 Sunoco. 1.8 2 oz per 5 gallons. I want to give it a while and see how the engine performs. This will eliminate the need to use Lucas and add the lead back into the system.

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post #9 of 13 (permalink) Old 08-24-2015, 09:19 PM
 
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I use non-ethanol premium 91 octane from the pump mixed with five gallons of 110 octane leaded race fuel. No ethanol worries, and plenty of octane for the 10.75:1 compression ratios.
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post #10 of 13 (permalink) Old 09-01-2015, 08:17 AM
 
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So if you just do a factory rebuild of a 350hp or 360/400 can you run on the the standard premium or are their ping issues? I assumed that when doing the heads, all the places replace the valves to work on unleaded.
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General Discussion

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