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420A turbo vacuum line problem 1psi boost

Posted by Hunteremerson17, Oct 10, 2018

  1. Hunteremerson17

    Hunteremerson17 Probationary Member

    Joined Oct 10, 2018
    Liberty, Kentucky
    Could this be the reason why it’s so hard on gas? Like 20mpg tops... plus I run 93 in it and it’s like $3.08 atm

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  2. dustyboner

    dustyboner Proven Member

    Joined Mar 13, 2016
    abq, New Mexico
    Did the aftermarket regulator look like this?
  3. Vegas smith

    Vegas smith Proven Member

    Joined Dec 2, 2002
    Houston, Texas
    Definitely could be. The key to making these cars run well is stamping out all the little leaks and such.
    My DSM:
    1993 Eagle Talon TSi AWD

    Street Build

    GT30   manual
    1992 Eagle Talon TSi AWD (sold)

    16g   manual
  4. dustyboner

    dustyboner Proven Member

    Joined Mar 13, 2016
    abq, New Mexico
    since you have a star turbo kit on your car, i dug up the install guide for it. Again you need the FMU (after market regulator) installed to run any boost on your engine. any amount of boost is adding more air to the mixture and without the FMU there is no extra fuel being added to compensate. You will run extremely lean and destroy your motor.
    If you don't wanna run a FMU you need to get something like a megasquirt and larger injectors, then have it tuned before you boost.

    star_stg2.jpg star_inst_page1.jpg star_inst_page2.jpg star_inst_page3.jpg
    silvreclips likes this.

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