What octane do I need to be at? - Pontiac GTO Forum
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post #1 of 20 (permalink) Old 02-12-2013, 03:32 PM Thread Starter
 
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What octane do I need to be at?

I have a 1970 Judge Ram Air III and wanted to know what fuel I should be running. In my 1970 LS6 Chevelle I run a blend of 55/45 or 50/50 of 110 Sunoco racing fuel with 91 unleaded premium. This mix brings me in at around 99-100 octane with the lead needed. Thanks for the help.

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post #2 of 20 (permalink) Old 02-12-2013, 03:57 PM
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I run Sunoco 93 oct and add 1oz of Lucas Ethanol Treatment per every 5 gallons. The car screams.

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post #3 of 20 (permalink) Old 02-13-2013, 09:00 AM
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If your Judge is stock, around 96-100 octane will be fine.
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post #4 of 20 (permalink) Old 02-13-2013, 11:37 AM Thread Starter
 
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It is stock. I will shoot for a blend of 110 and 91 to end up around the upper 90's.

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1970 Black Cherry Chevelle LS6
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post #5 of 20 (permalink) Old 02-13-2013, 01:30 PM
 
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I can't find any more than 91 here. And the octane booster is pretty much useless.
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post #6 of 20 (permalink) Old 02-13-2013, 02:09 PM
 
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I was wondering the same thing. My motor is only 9.5 compression. Runs well on 92 octane. Would there be any performance gain at the track if I do a
50/50 mix with 100 octane that's available at a few stations here?
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post #7 of 20 (permalink) Old 02-13-2013, 06:42 PM
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Klikm, no. Actually, a performance decrease. If it doesn't ping with 92, you are fine. Higher octane fuel burns slower, which helps with HC engines, but is a detriment to power on lower compression applications. Skurf, the one octane booster that actually works is TEL 130, sometimes called Octane Supreme 130. It's real Tetraethyl Lead, so it actually works, and works well. Not cheap, and not meant for street use, either.
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post #8 of 20 (permalink) Old 02-13-2013, 08:33 PM
 
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Thanks geetee...! I am going to try it.
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post #9 of 20 (permalink) Old 02-13-2013, 08:47 PM
 
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Just ordered a case from Wild Bill's Corvette for $120 plus $12 shipping. The only one I saw on eBay was a quart for $20.95 plus $16 shipping. Thanks again for thi tip. Now to get the mix right.
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post #10 of 20 (permalink) Old 02-20-2013, 08:53 PM
 
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Just got my Octane booster case today. Not sure what my compression ratio is. Pretty much a stock rebuilt 400 1967. Any clues on how much to add? I figure if I have 10:1 and go 1oz. To the gallon I should be close to 95. Does that sound about right?
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