E85 & Nitrous
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E85 & Nitrous

  1. #1
    Retired Air Force Master Sergeant's Avatar
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    Default E85 & Nitrous

    What is the maximum nitrous shot a N/A BBC could take using E85 w/ a 14 to 1 compression ratio? I am thinking not a lot as 14 to 1 is already close to the limit for E85 octain.

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    yer pushin it dont know what you are lookin for ,total destruction?

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    Highaboosta Unchained's Avatar
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    I don't have any input on the nitrous shot but E85 will run at a lot higher compression ratio than 14:1
    You can't make enough static compression N/A to be above what E85 will run at.
    Last edited by Unchained; 11-01-2012 at 08:20 PM.

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    Senior Member ap67et10's Avatar
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    Yep, like mark said, you aren't even close to the threshold of E85. I have heard of people with 13+:1 ratio running 15+ psi of boost on just E85. I would say you can run as much nitrous as your engine can take, because the fuel shouldn't have a problem.

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    Quote Originally Posted by ap67et10 View Post
    Yep, like mark said, you aren't even close to the threshold of E85. I have heard of people with 13+:1 ratio running 15+ psi of boost on just E85. I would say you can run as much nitrous as your engine can take, because the fuel shouldn't have a problem.

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    Bostick Racing Engines six-oh-nine's Avatar
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    How much you looking to spray? Only reason I ask is because there will be a point of diminishing returns, where the more you spray, the less you gain. Basically, for methanol, about 200-250 shot is about all you really want to go before switching over to gasoline for enrichment fuel, if the motor is on alcohol/e85 as well.
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    Retired Air Force Master Sergeant's Avatar
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    My thoughts were around 250

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    Bostick Racing Engines six-oh-nine's Avatar
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    Quote Originally Posted by Master Sergeant View Post
    My thoughts were around 250
    I would say that, for methanol, you'd be right at the crossover point of needing to go with gasoline for your enrichment fuel. Seeing that you are running e85, I'd say you're fine and just need to jet accordingly. One thing to consider though, most nitrous tuneups are designed to be run with gasoline, so, you'd have to make some adjustments and some tuning learning curve to get it "just right". Having said that, and been down the mixing fuels route, for a 250 shot, I'd still just run with the e85.... and would say you'd either be just about squared up or a couple jets higher on the fuel side.... or roughly 5-9 on a plate system.
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    Quote Originally Posted by six-oh-nine View Post
    I would say that, for methanol, you'd be right at the crossover point of needing to go with gasoline for your enrichment fuel. Seeing that you are running e85, I'd say you're fine and just need to jet accordingly. One thing to consider though, most nitrous tuneups are designed to be run with gasoline, so, you'd have to make some adjustments and some tuning learning curve to get it "just right". Having said that, and been down the mixing fuels route, for a 250 shot, I'd still just run with the e85.... and would say you'd either be just about squared up or a couple jets higher on the fuel side.... or roughly 5-9 on a plate system.
    Thanks

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    Quote Originally Posted by Bodean's Hammer View Post
    Paging Wildhair.........Wildhair please.......
    I saw that to. so 9.75 and 14 lbs of boost should be good to go
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    I'm thinking that you ask me if I wanted to run up at CFW for Father's Day. With a little more seat time I would have but with a 250 shot I'm no so sure now. That thing was already haulin the mail.

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    Quote Originally Posted by steele211 View Post
    I'm thinking that you ask me if I wanted to run up at CFW for Father's Day. With a little more seat time I would have but with a 250 shot I'm no so sure now. That thing was already haulin the mail.
    The nitrous idea is a long ways off I am just trying to chose a new fuel pump (Weldon) for now.

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    Distinguished Member David 519's Avatar
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    Tim, you probably already know but there's more to a nitrous tune up than fuel. A small shot, say 150 or under, pretty easy. When you start spraying more, your motor needs to be built for it. At a minimum, more end gap on the rings, tougher top ring and if you start spraying it hard, you'll want to scoot the ring down on the piston. Also you need to move timing around based on how much spray. As far as enrichment fuel, the alky guys seem about split, some use race gas, some alky just more. Both will work. If you get serious about nitrous, spend some time over on Yellow Bullet's nitrous forum. Lots of good info there. I've never had to run over a 150 HP shot to hit our number, usually way less, but I'm happy to give you all the details on what we do if you decide to move forward.
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