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Computer issues with my turbo system???

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  • Computer issues with my turbo system???

    Hello i just purchased a 1993 trans am. It has a garrett precision turbo kit with a T-68GTS.. it is turbo to water and everything is good except for a few scratches and bells and whistles.. However, there is one issue im not too particular about.. When i floor the T/A around 4 grand it seems it hits the rev limiter but it has been taken to redline before the problems.. everything works fine driving normally but especially when racing it seems to do it more often than not. once in a great while it wont do it and runs fine.. i tried changing out the turbo filter and put a new one in and it still doesnt work.. i just want some feedback as to what could be the problem.. if there is anything u can contribute i would greatly appreicate it thanks!! and some things to add it was tuned on the stock ECM.. the tune is based on 2 bar map sensor. the system is running around 11-12 volts right now.. The tune was performed on a dyno at AKRON Hp in Ohio.. another thing if i ease into it 500 rpms at a time i can get up to 6 grand no problem.. its when i load it all on it at once it occurs.. Horsepower wise. at the motor is around 450 horsepower and at the wheels it is running 345 there abouts with 7 lbs of boost.. the injectors are SVO#36 .. im not too sure about the retard timing on the boost or if the knock retard programming was altered.. i think it was dynoed with the computer acting as a retard for the boost.. which explains the low max boost.. This whole entire system was designed and put in at ohio forced inductions.. the kit includes

    1 3/4 Tubular Headers

    T-68GTS (Garrett) Precision Turbo

    2 1/2" Crossover Pipe


    3" Downpipe


    V-band clamps on Headers and Downpipe

    5-Ply Silicone


    Custom 3 1/2 Aluminum Radiator


    2 Spal Fans


    Tial 50mm BOV


    Tial 44mm WG


    Oil Drain and Feed Lines

    If there is any other information needed let me know

  • #2
    wow i have absolutely no idea.. i would first talk to the guys that did the tune and see if they have an idea since they set everything up




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    • #3
      My first guess is fuel...or lack thereof.

      Did the fuel system get upgraded as well? Fuel pump still stock? If so, how many miles are on it?

      I'm also wondering if with the injector change, are you maxing out pump volume?

      Doesn't sound like a filter, but I would check that too...

      And definately talk to the place that did the tune...see what they set the timing to...
      Originally posted by Redd8407
      I WANT NOISE! SPEED! AN ENGINE THAT SHAKES MY INTERNAL ORGANS LIKE THEY GOT PARKINSON'S! I DONT WANT AN ENGINE THAT IS PARTIALLY POWERED BY MY LAPTOP BATTERY!
      Originally posted by Z28ISGR8
      WHY THE F*CK IS THERE A GOAT ON A FERRARI?
      Originally posted by Darren
      I think it is because I take it in and out all the time, the rubber has just stretched out, especially at the bottom where it is really thin. It annoys me more then anything.

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      • #4
        get a wideband if you don't already have one
        sigpic
        Sold!
        www.fquick.com/lozanoa11
        94 Grand Cherokee (sold)
        95 Accord(for sale)
        99 Outback (snow destroyer)

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        • #5
          better pull them plugs out and have a look

          could be too much fuel as well
          sigpic
          The LS1 or Go Home Crew

          ASE master certified
          1998 Camarbo z28-going back to stock
          11.3@121 old heads & cam setup




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