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Thread: Help: Gt28rs, less power than the stock turbo

  1. #1
    boost on the way! Peter5's Avatar

    Black Mica Mazda Protegé 5 2002

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    Help: Gt28rs, less power than the stock turbo

    So i just finished the install of a brand new garrett gt28rs on my msp and went for a test drive to find its worst than my stock turbo...
    Theres is definitly something wrong here.
    I had the hiboost set up on my p5 with the ihivf22 which is similar as the gt28 and was a torque monster.
    Feels like the potato is not spooling fast at all and was running 5-8psi and was not impressed by the power at all
    Suporting mods are:
    -Steedspeed exhaust mani
    -Pope down pipe
    -2.5 test pipe
    -2.5 racing beat cat back
    -fmic
    -forged wga
    -gutted intake mani
    -aem wideband truboost

    I am running on stock tune and been running for the past 2 years at around 9psi with stock turbo

    Note: after further inspection i found the vaccum hose from my boost solenoid to the wga collapsed, i changed it but never had the time to test drive again. Unsure if this could cause the issue.
    Last edited by Peter5; 06-20-2018 at 03:14 AM. Reason: Additional info

  2. #2
    MOTM Winner Jan '09 Kooldino's Avatar
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    MP3

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    I ran a 28rs for awhile and didn't love it. I moved back to a 60 trim T3 and I love it. I've run many turbos in my car, and the T3 is the most fun.
    Vivid Yellow MP3 - SpeedCircuit Turbo Kit @ 14-19 psi - SpeedCircuit forged motor - SpeedCircuit built trans with PAR gears & M-FactoryLSD - and FAR too many mods to list. 13.3 @ 108 - 18psi on the T3 in 2005
    Be sure to check out SpeedCircuit on facebook!

    Pope MSP Turbo Manifolds on sale now!

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