EFI Twin Turbo
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EFI Twin Turbo

  1. #1
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    Default EFI Twin Turbo

    Just because I am curious...what is the better way to do EFI...draw thru or blow thru?

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    Highaboosta Unchained's Avatar
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    Draw through is old school.
    Prone to fuel settling out in the compressor and piping.
    Add an intercooler and the problem is compounded.
    I did it that way back in the 80's when I was racing sand drags.


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    I meant for efi...I know DT is old school when it comes to carbs...but I have seen it done very successfully.


    That boat was turn key for decades. Not saying there wasn't work arounds with it, I know at 20lbs he was using a NOS plate to dump fuel in...but it did work.

    My question was more about EFI though...Is it better to locate the throttle body under the innercooler (blow thru) or before the turbos (draw thru)?

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    Draw through may be old school, but it has been working for many years and generally, it's way cheaper.
    There are a couple of limitations to draw through to keep in mind. Generally you may be limited to the cubic inches
    that it really works with and not all turbos are compatable with the draw through system.
    On the other hand, if money is not an object, blow through is usually better if you know how to operate a computer.

    I'm sure others will chime in with more details, both for and against.
    Yea, draw through is old school, but we know it works...
    Last edited by jimsplace; 01-04-2014 at 07:35 PM.

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    This is a Gentry/Brummett EFI twin turbo.. The throttle blades are after the turbo before the intercooler. Injectors are in the intake runners under the intercooler..
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    My Idea for that factory clean Smartcraft gauge dash board
    with guardian mode protection features

    Use a Mercury Racing 1350 TT PCM EFI/ COP ignition system .
    and there oem computer controlled turbos

    Hook that up to the BBC of your choice

    Mercury makes the harness ,sensors and link gauges
    plug and play wiring

  9. #7
    gn7
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    Quote Originally Posted by terrible_buddhist View Post
    Just because I am curious...what is the better way to do EFI...draw thru or blow thru?
    Quote Originally Posted by Unchained View Post
    Draw through is old school.
    Prone to fuel settling out in the compressor and piping.
    Add an intercooler and the problem is compounded.

    I did it that way back in the 80's when I was racing sand drags.
    Quote Originally Posted by jimsplace View Post
    Draw through may be old school, but it has been working for many years and generally, it's way cheaper.
    There are a couple of limitations to draw through to keep in mind. Generally you may be limited to the cubic inches
    that it really works with and not all turbos are comparable with the draw through system.
    On the other hand, if money is not an object, blow through is usually better if you know how to operate a computer.

    I'm sure others will chime in with more details, both for and against.
    Yea, draw through is old school, but we know it works...
    Maybe the rocket scientist here can explain to this dummie how a turbo needs to be something special to deal with draw thru as opposed to blow thru, or how fuel puddles in the cooler, or manifold if the EFI throttle body is before the turbo. Or why you need special computer skills that different for a draw thru than a blow thru

    Please use plain English so this dummie can understand your explaination. After all I am just a dumb carb and roots hick.



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    Last edited by gn7; 01-04-2014 at 12:01 PM.

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    Here's a pic of my old Race Aero EFI blow thru, Autronics ignition, 500 ci BBC made 760 hp with 9 lbs of boost. It starts right up every time. Next is a carbed Race Aero blow thru, 468 ci BBC made 850 hp with 15lbs boost. It starts a little harder, but I've had it for nine yearsAttachment 450089Click image for larger version. 

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    I DKS about turbos, but I would think the blow thru deal would offer better perf. having positive airflow available at the intake above the tb, as opposed to having the tubo sucking the air through it then sending it down stream to the intake. Like I said I don't know squat, just my thoughts on the way it would work.

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    Quote Originally Posted by sammyc57 View Post
    I DKS about turbos, but I would think the blow thru deal would offer better perf. having positive airflow available at the intake above the tb, as opposed to having the tubo sucking the air through it then sending it down stream to the intake. Like I said I don't know squat, just my thoughts on the way it would work.
    As opposed to a roots sucking thru a hat???



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    Quote Originally Posted by gn7 View Post
    As opposed to a roots sucking thru a hat???
    No plumbing for the roots air to get to the intake, its all right there close together, and no science to back the thought up, just a thought thinking about available air. Kinda like why the car man. have all added big plenums to the engines of modern cars.

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    Quote Originally Posted by sammyc57 View Post
    No plumbing for the roots air to get to the intake, its all right there close together, and no science to back the thought up, just a thought thinking about available air. Kinda like why the car man. have all added big plenums to the engines of modern cars.
    No doubt a blow thru throttle body can be made less complex, simpler and lighter. Plus you can even use fancy dancy inlet bells with trick little inlet guide vane on them. I see no benefits to a draw thru
    My original question was how a draw thru efi creates fuel puddling or require different computer skill set.



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    Quote Originally Posted by gn7 View Post
    No doubt a blow thru throttle body can be made less complex, simpler and lighter. Plus you can even use fancy dancy inlet bells with trick little inlet guide vane on them. I see no benefits to a draw thru
    My original question was how a draw thru efi creates fuel puddling or require different computer skill set.
    As far as the puddling thing, I thought you were joking. Kinda hard to puddle fuel in the inlet hoses when its being injected in the manifold!

  16. #14
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    Quote Originally Posted by sammyc57 View Post
    As far as the puddling thing, I thought you were joking. Kinda hard to puddle fuel in the inlet hoses when its being injected in the manifold!
    No I wasn't joking. The forum EFI guru was the one that posted that draw thru can suffer fuel puddling.



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