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Race fuel, Needed or not???

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Old 06-28-2006, 01:20 PM
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Default Race fuel, Needed or not???

I have been mixing c12 and 93 octane. I have people telling me I need to use C12 fuel. I have others telling me I don't. If I need it, I don't mind using it. If I don't, I would rather save the $400 per tank full. My engines are 8.5 to 1 and I am running about 7 lbs of boost. i have just over 1,100 HP. Is there an accurate way of figuring out if you need the extra octane?
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Old 06-28-2006, 01:26 PM
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Default Re: Race fuel, Needed or not???

Who built the engines call them.
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Old 06-28-2006, 01:44 PM
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Default Re: Race fuel, Needed or not???

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Who built the engines call them.
Yes.

My engines will run on 93 if they need to but I go ahead and run 110 for piece of mind.
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Old 06-28-2006, 01:49 PM
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Default Re: Race fuel, Needed or not???

Quote:
Originally Posted by LubeJobs42
I have been mixing c12 and 93 octane. I have people telling me I need to use C12 fuel. I have others telling me I don't. If I need it, I don't mind using it. If I don't, I would rather save the $400 per tank full. My engines are 8.5 to 1 and I am running about 7 lbs of boost. i have just over 1,100 HP. Is there an accurate way of figuring out if you need the extra octane?
at 8.5 to 1 and 7lb's of boost with a innercooler, I will post a chart.
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Old 06-28-2006, 01:51 PM
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at 8.5 to 1 and 7lb's of boost with a innercooler, I will post a chart.
http://www.blowerdriveservice.com/techcharts.php
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Old 06-28-2006, 01:56 PM
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Default Re: Race fuel, Needed or not???

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I think the chart is with no innercooler. Talked to BDS and they said, as long as you are at your max rpm, you are not going over 7lb's of boost of innercooled air, 93oct is what you should run. Thats with alum. heads and a 12 to 14:71 blower.

Last edited by blume; 06-28-2006 at 02:09 PM.
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Old 06-28-2006, 02:04 PM
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Default Re: Race fuel, Needed or not???

I am at 9lbs on 93 only no boom yet We Dynoed it at Precision Marine past 9 lbs and it picked up some detination so we put it on some race gas and went up to 11.5lbs of boost with no detination

The motor in My old Scarab was at 11.5psi on 93 with no probs.Tuned it on Oddys Dyno

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Old 06-28-2006, 02:05 PM
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Default Re: Race fuel, Needed or not???

Other factors to consider along with simple boost/compression are inner coolers, aluminum heads, and blower size.
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Old 06-28-2006, 03:12 PM
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Default Re: Race fuel, Needed or not???

Quote:
Originally Posted by blume
I think the chart is with no innercooler. Talked to BDS and they said, as long as you are at your max rpm, you are not going over 7lb's of boost of innercooled air, 93oct is what you should run. Thats with alum. heads and a 12 to 14:71 blower.
I have 14-71's, Aluminum heads, intercooler, mechanical and electric fuel pumps. I figure the last thing I need is to ber kicking Rio Roses Ass and having a problem because I used 93 octane!
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Old 06-28-2006, 03:18 PM
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Originally Posted by LubeJobs42
I have 14-71's, Aluminum heads, intercooler, mechanical and electric fuel pumps. I figure the last thing I need is to ber kicking Rio Roses Ass and having a problem because I used 93 octane!
sounds like all that and 18lb's of boost, real good gas and you will be ready......no excuses.
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