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7-11 93 octane
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<blockquote data-quote="swampratt" data-source="post: 3318760" data-attributes="member: 15054"><p>Lots of people wanting to go quicker. many cars are turbo or supercharged today..most state you can use 87 octane but like the Fiat 500 91 octane is recommended.</p><p></p><p>There were off the shelf octane boosters years ago that had a lot of MTBE and some hat TEL (lead)</p><p>Those would make a difference when added to a tank of fuel.</p><p>But do the math and many times the Octane booster will cost as much as just getting the higher octane fuel.</p><p></p><p>I build my engines with high compression.. Because I like it.</p><p>Makes an engine snappy.</p><p>My old 78 Nova wanted 41 total timing with 93 Sinclair or 91 octane it would like 39 total timing.</p><p>For us that tweak to the last hundredth of a second that 93 may be good.</p><p></p><p>And not all 91 will run the same.</p><p>I tuned both of my V8 cars for the 10% ethanol 91 and then they went to 100% gas 91.</p><p>That stuff pinged and ran horrible..Jetting did not fix the issues. Both fuels from 7-11.</p><p>I had to change the timing ..pulled it back as the 100% gas could not tolerate the advance curve i had.</p><p></p><p>I was not the only one.</p><p></p><p>Yea 80% of the cars out there will get by with 87 or less but the other 20% of us may like the option.</p><p>I have mixed up to 50% E85 and 91 octane to get some added umph. I had to rejet on that deal also.</p><p></p><p>Newer cars can be programed for the stuff and possibly make a bit more power.</p><p></p><p>Back in 1993 I was mixing Toluene in with the pink 93 octane and MTBE and TEL was added into the mix for fuel that cost me just about 7 bucks a gallon to make.</p><p>Man the Nova ran great on that stuff.</p><p>It had 11.9 compression 350" and a small 270H comp cam 245 PSI cranking pressure.</p><p>That block is in my 57 chevy now with 10.87 compression and a 280H cam.</p><p>I can run 87 but keep my foot out of it or pull timing.</p><p>High octane it gets it on much better.</p></blockquote><p></p>
[QUOTE="swampratt, post: 3318760, member: 15054"] Lots of people wanting to go quicker. many cars are turbo or supercharged today..most state you can use 87 octane but like the Fiat 500 91 octane is recommended. There were off the shelf octane boosters years ago that had a lot of MTBE and some hat TEL (lead) Those would make a difference when added to a tank of fuel. But do the math and many times the Octane booster will cost as much as just getting the higher octane fuel. I build my engines with high compression.. Because I like it. Makes an engine snappy. My old 78 Nova wanted 41 total timing with 93 Sinclair or 91 octane it would like 39 total timing. For us that tweak to the last hundredth of a second that 93 may be good. And not all 91 will run the same. I tuned both of my V8 cars for the 10% ethanol 91 and then they went to 100% gas 91. That stuff pinged and ran horrible..Jetting did not fix the issues. Both fuels from 7-11. I had to change the timing ..pulled it back as the 100% gas could not tolerate the advance curve i had. I was not the only one. Yea 80% of the cars out there will get by with 87 or less but the other 20% of us may like the option. I have mixed up to 50% E85 and 91 octane to get some added umph. I had to rejet on that deal also. Newer cars can be programed for the stuff and possibly make a bit more power. Back in 1993 I was mixing Toluene in with the pink 93 octane and MTBE and TEL was added into the mix for fuel that cost me just about 7 bucks a gallon to make. Man the Nova ran great on that stuff. It had 11.9 compression 350" and a small 270H comp cam 245 PSI cranking pressure. That block is in my 57 chevy now with 10.87 compression and a 280H cam. I can run 87 but keep my foot out of it or pull timing. High octane it gets it on much better. [/QUOTE]
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