The world is ending as we know it....
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The world is ending as we know it....

  1. #1
    It's what we do BDMarine's Avatar
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    Default The world is ending as we know it....

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    But here's the thing: NASCAR's common plenum manifold throws a curve to the engineers and tuners who might have EFI experience from other racing series.

    "In that common plenum manifold, each cylinder is still talking to each other through the firing order sequence," Yates said. "And it does still pull fuel from one cylinder to the other, which is something that's unique to our sport and a challenge, but also an opportunity that other series don't see.
    Interesting thing about efi in a single plane intake.
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    Senior Member motormonkey's Avatar
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    Its about time I think. To make it interesting they should run it a builders choice for carb or EFI.

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    And just a couple months ago the first turbo EFI boat ran at Firebird too after all these years.

    Bernoulli is turning over in his grave.

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    Quote Originally Posted by Trigger View Post
    No one cares about your buddies old antiquated garden hose technology. Tell him that nowadays if you don't have efi, turbos, or an LS you ain't got shit! Lol!!!
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    It's what we do BDMarine's Avatar
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    Quote Originally Posted by steelcomp View Post
    Interesting thing about efi in a single plane intake.
    Not too surprising considering the relatively short runner length, however, much easier to deal with using an O2 sensor and a laptop.
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    Red Blooded American The Doctor's Avatar
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    Hey, if Tom Compton ever wakes up and reads this, even the NHRA Pro Stock might follow suit in another decade provided we have manufacturers still making those type cars then.
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    Yup...








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    gn7
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    Quote Originally Posted by The Doctor View Post
    Hey, if Tom Compton ever wakes up and reads this, even the NHRA Pro Stock might follow suit in another decade provided we have manufacturers still making those type cars then.
    The idea that they were afraid of run away costs hurting the lesser funded teams fell apart long ago. Sportsman classes have switched over, if anything because it was cheaper in the long run.



    The idea that the cross talk in the manifold pops up in the conversation is kind of funny. It happens with a carb as well. You would like to think that richening one hole without effecting the others would be simple. But not in a manifold that closely coupled.

    So at this rate can we assume that DFI in either Nascar or the NHRA is 30 years away?

    There may be an up side to them being so slow on the curve. When we are all driving plug ins, they will still be racing cars that actually make noise.
    Last edited by gn7; 01-13-2012 at 02:59 PM.
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    It's what we do BDMarine's Avatar
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    Quote Originally Posted by gn7 View Post
    The idea that they were afraid of run away costs hurting the lesser funded teams fell apart long ago. Sportsman classes have switched over, if anything because it was cheaper in the long run.



    The idea that the cross talk in the manifold pops up in the conversation is kind of funny. It happens with a carb as well. You would like to think that richening one hole without effecting the others would be simple. But not in a manifold that closely coupled.

    So at this rate can we assume that DFI in either Nascar or the NHRA is 30 years away?

    There may be an up side to them being so slow on the curve. When we are all driving plug ins, they will still be racing cars that actually make noise.
    He mentions that it does STILL pull fuel meaning that it always has with a carb and they were finding that EFI does also. Look how high the injectors are in the runner. We have experimented with that with good power results. The higher in the runner, the more likely to pull fuel from other cylinders. The way I read it, NASCAR and EFI is now, not 30 years.
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    gn7
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    Quote Originally Posted by BDMarine View Post
    He mentions that it does STILL pull fuel meaning that it always has with a carb and they were finding that EFI does also. Look how high the injectors are in the runner. We have experimented with that with good power results. The higher in the runner, the more likely to pull fuel from other cylinders. The way I read it, NASCAR and EFI is now, not 30 years.
    I posted another 30 years for DFI!
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    Quote Originally Posted by gn7 View Post
    The idea that they were afraid of run away costs hurting the lesser funded teams fell apart long ago. Sportsman classes have switched over, if anything because it was cheaper in the long run.



    The idea that the cross talk in the manifold pops up in the conversation is kind of funny. It happens with a carb as well. You would like to think that richening one hole without effecting the others would be simple. But not in a manifold that closely coupled.

    So at this rate can we assume that DFI in either Nascar or the NHRA is 30 years away?

    There may be an up side to them being so slow on the curve. When we are all driving plug ins, they will still be racing cars that actually make noise.
    It's far less of an issue with a carb. In the EFI intake, you have a good deal of the intake upper runners and the entire plenum that's air-only. You start cross-talking between air/fuel and air-only, it can get a little "confusing". With a carb, there's basically no where in the intake below the carb that isn;t an air/fuel mixture, so cross talking really doesn't have much of an effect...at least not like it will with EFI. This is part of why having the injectors higher in the runners works better.
    Last edited by steelcomp; 01-13-2012 at 04:50 PM.
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  13. #12
    gn7
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    Quote Originally Posted by steelcomp View Post
    It's far less of an issue with a carb. In the EFI intake, you have a good deal of the intake upper runners and the entire plenum that's air-only. You start cross-talking between air/fuel and air-only, it can get a little "confusing". With a carb, there's basically no where in the intake below the carb that isn;t an air/fuel mixture, so cross talking really doesn't have much of an effect...at least not like it will with EFI. This is part of why having the injectors higher in the runners works better.
    I think thats the point they were talking about. It is a air/fuel mix in the plenum, and I imagine it starts the second the engine fires. Worse and low Rs than high, but still there all the way thru the RPM band.
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    Quote Originally Posted by steelcomp View Post
    It's far less of an issue with a carb. In the EFI intake, you have a good deal of the intake upper runners and the entire plenum that's air-only. You start cross-talking between air/fuel and air-only, it can get a little "confusing". With a carb, there's basically no where in the intake below the carb that isn;t an air/fuel mixture, so cross talking really doesn't have much of an effect...at least not like it will with EFI. This is part of why having the injectors higher in the runners works better.
    I see the F1's put the injectors right outside of the runners,

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    Quote Originally Posted by Trigger View Post
    No one cares about your buddies old antiquated garden hose technology. Tell him that nowadays if you don't have efi, turbos, or an LS you ain't got shit! Lol!!!
    Quote Originally Posted by MAXIMUS View Post
    I think I could run more boost but it's a real hand full right now

  15. #14
    gn7
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    Not really that new of an idea when you think about it.
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