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[Ecotec] L67 M90 Bypass

Discussion in 'V6 Development And Modification' started by AnuchaVTS, Aug 25, 2015.

  1. AnuchaVTS

    AnuchaVTS Tattoo Artist

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    Hey i know this question has popped up many times these last 15 years or so but anyways im asking.

    M90 Boost Bypass Mod - Is it actually safe to run the bypass mod even tho there is no Vacuum pressure being thrown out ?

    All my previous cars have been Turbo cars from Supras , skylines etc etc you name it..
    And i have seen many people by pass their turbo IE - GATED ... and after while their turbos crap it self or they do some internal damage.

    So while ive read many people bypass their M90 that leads me to think where does that Excess boost pressure get thrown out??

    Thanks
     
  2. SweetWagon

    SweetWagon booosted

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    Your only bypassing the solenoid which is controlled by the PCM and prone to leak/fail. The actual bypass valve/actuator still functions.
     
  3. AnuchaVTS

    AnuchaVTS Tattoo Artist

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    Ahh ok ..
    The bypass mod that i read was people loosening off the 2 12ml bolts and pushing down on the Actuator as far as it goes then tighten back up
    is that safe to do aswell ?
     
  4. SweetWagon

    SweetWagon booosted

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    Disabling the bypass valve is not recommended. I'd leave it alone and just stick to bypassing the solenoid as they are what cause boost issues.
     
  5. AnuchaVTS

    AnuchaVTS Tattoo Artist

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    awesome thanks for the replies man

    can you tell me the best way to bypass the solenoid ??
    Im bout to upgrade to the 10psi pulley and belt in next week or bit ...
     
  6. SweetWagon

    SweetWagon booosted

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    There's a guide on l67torque.

    Essentially you want to just remove both hoses that lead down to the solenoid, you can unbolt and remove the solenoid too if you like. The free port left on the bottom of the actuator you can leave open but it's a good idea to use some stocking to cover it and stop debris getting in. The free port left on the supercharger needs to be blocked or it makes a good place to connect a boost gauge.
     
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  7. BradsL67

    BradsL67 New Member

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    Did SweetWagon's suggestion an got 2 or 3 psi more, thankyou
     
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