Surge Tank for EFI - Page 2
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Thread: Surge Tank for EFI

  1. #21
    7,000 Post Club My location wrench459's Avatar
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    Quote Originally Posted by Swiftus View Post
    ....
    Maybe I'll just compensate for fuel pressure like we do in the race cars. There we are running a returnless system, but it is a very dumb returnless system. All of the fuel pressure regulation happens within the fuel tank itself and then the entire feed line from the tank to the injector is regulated and one way.
    I've played around with variable speed/pressure returnless before.
    Let's just say that they have there own unique problems to work around.

    Si vis pacem, para bellum "If you want peace, prepare for war"

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    Opel Intern Swiftus's Avatar
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    Quote Originally Posted by wrench459 View Post
    I've played around with variable speed/pressure returnless before.
    Let's just say that they have there own unique problems to work around.
    This system is super simple mechanically and relies on the ECU to do all of the compensations.

    There is a spring-loaded valve which opens at ~350kPa of pressure, creating an outlet and line pressure of ~350kPa. Then at the fuel rail we have a pulsation damper along with a very fast pressure sensor and temperature sensor. Then in the MoTeC ECU we simply compensate for pressure and temperature in the opening time of the fuel injector. Compensation tables FTW.
    wrench459 likes this.

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    Senior Member nickincrete's Avatar
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    Quote Originally Posted by Swiftus View Post

    Swirl pots compress out the air and force it to exit through the 'up' position in a swirl pot. But I don't know if I am a fan of the return line from the regulator also going to the swirl pot or surge tank. It almost guarantees 3-5psi of backpressure on that line. The backpressure must screw with the fuel pressure regulator on some level, causing irregular fuel pressures. Below is an drawing of the way I am currently thinking of routing a surge tank.

    .
    Here is my tank, it costs about 50 bucks
    As you can see it is vented back to the tank from the top outlet.
    I think that this should prevent the backpressure from building up too much.
    However I see your point and its quite simple to have the fuel manifold return go straight to the tank. I still think, in addition it would be better to have a tank return from the surge tank as well, as in your diagram. The ebay seller I bought this from will put whatever size unions you require and would also omit a union for your set up free of charge
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    Last edited by nickincrete; 02-08-2015 at 02:32 AM.

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  6. #24
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    More EFI questions

    Installing my own EFI system (Megasquirt) and know I need to upgrade the fuel system. I like the idea of a swirl pot for both the simplicity (not messing w/ the tank too much) and the added safety for cornering. While I am not building a race car I do plan to go to a few track days.

    Love this thread but wanted to surface a few of my remaining questions. (1970 Opel GT (manual trans) w/ 2.2L EFI Engine running megasquirt)

    1.Where and how are people mounting everything? I want this to be tucked up for safety and looks. While I am interested in everything I am particularly interested in the location of the surge tank.

    2.What size fuel lines are people running?

    3.What type of fuel lines are people running (ex. solid , braided PTFE, a mix?) ?

  7. #25
    Pedal Smasher Autoholic's Avatar
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    Quote Originally Posted by pbboy12 View Post
    1.Where and how are people mounting everything? I want this to be tucked up for safety and looks. While I am interested in everything I am particularly interested in the location of the surge tank.
    I can't comment on the other questions, but for safety I'd do two things. I'd have the surge tank coated with a truck bed liner, anyone who has seen a truck bed liner take an explosion knows the stuff is strong. For mounting safety, I'd consider mounting it near the driver's side footwell / fender. The nose has room, but that is the first area to take a hit in a frontal impact. Mounting it near the driver's side footwell has the most available room. Maybe underneath the support beam that covers the brake pedal push rod?
    ~Joe
    "Autoholism is an incurable addiction medicated daily with car porn." ~Me

    "the sickest of the sick — a car guy who is collecting parts for the restoration of a car he doesn’t even own yet." ~Anonymous

  8. #26
    7,000 Post Club My location wrench459's Avatar
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    Quote Originally Posted by pbboy12 View Post
    Installing my own EFI system (Megasquirt) and know I need to upgrade the fuel system. I like the idea of a swirl pot for both the simplicity (not messing w/ the tank too much) and the added safety for cornering. While I am not building a race car I do plan to go to a few track days.

    Love this thread but wanted to surface a few of my remaining questions. (1970 Opel GT (manual trans) w/ 2.2L EFI Engine running megasquirt)

    2.What size fuel lines are people running?
    3/8ths OD supply and return.

    Si vis pacem, para bellum "If you want peace, prepare for war"

  9. #27
    Owner of EZ2Wire.com My location GoinManta's Avatar
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    This is how I did it.

    CURRENT
    '71 Opel Kadett 4 Door 36D (2.0 L w/ EFI & Auto) - "Mary Ann"
    '74 Opel Manta - "Barbara"
    '05 Pontiac GTO

    In the past owned:
    '06 Pontiac GTO
    2 Bitters (#491/#439)
    '73 Commodore GS
    ATLAS ( 74 Manta w/ 2.8L LK5 )
    '73 Blue Max Manta Luxus
    & at least 20 other Opels

  10. #28
    Senior Member nickincrete's Avatar
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    im putting mine on the back of the tyre shelf above the fuel tank.

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