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Thread: Return or Returnless 818R?????

  1. #1
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    Return or Returnless 818R?????

    Which direction opinions with explanation wanted?

  2. #2
    Senior Member Hobby Racer's Avatar
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    That depends. If you are going to stay with the OEM computer you should stick with the returnless setup so the ECU does not throw fits. If you are using an aftermarket ECU you can do either, but I would recommend a return type system. With a return type system you have better fuel pressure regulation (assuming you are using a quality fuel pressure regulator).

    You can see some information in my build thread about it.

    Return type system diagam

    If you go with a return type system you can easily modify the factory fuel rails to work well.

    Fuel Rail Modifications
    MK3.1 Roadster completed 2011
    818R built with EZ36R H6 completed 2018
    818R rebuild with a JDM Honda K24A

  3. #3
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    Ok, went return with a surge tank.

  4. #4
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    Doesn't the wrx set up have a return line back to the tank after the regulator?

  5. #5
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    Every WRX or STI that I've owned has been return style.

  6. #6
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    Quote Originally Posted by Aero STI View Post
    Every WRX or STI that I've owned has been return style.
    yeah all 5 of mine had return style too....

  7. #7
    Senior Member Bob_n_Cincy's Avatar
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    My NA impreza's have non-return. On big disadvantage of the non-return type is when you shut of the car you heat soak all the fuel lines on the engine. Then when you restart the is a chance of vapor lock.

    The return type constantly circulates fuel to the engine which help to keeps the fuel system cool.
    Bob
    818S #22 Candy Blue Frame, Front Gas Tank, 2.5L Turbo, Rear radiator, Shortened Transmission, Wookiee Compatible, Console mounted MR2 Shifter, Custom ECU panel, AWIC soon
    My Son Michael's Turbo ICE Build X22 http://thefactoryfiveforum.com/showt...rts-818S-Build
    My Electric Supercar Build X21 (on hold until winter) http://thefactoryfiveforum.com/showt...e-Build-Thread

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