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  • turbocharging my NA 3.1...

    right now i have a TGP VIN 'V' engine from a '90 TSTE in the local j/y sitting on the engine stand in my garage. unfortunately i pulled the heads off and discovered that one of the pisons has a nice hole in it since it will be awhile before i have cash to throw at a rebuild, i'm planning on bolting the TGP parts i have onto my NA 3.1 VIN 'T' engine instead. the 'T' engine already has 220,000 miles, and i could really care less what happens to it. i fully expect it to blow up and i hardly have a problem with that. anywayz...

    i plan on using the TGP rear exhaust manifold, my rebuilt SS braided TGP crossover pipe, my TGP T25 turbo, all of the T25 oil/coolant lines, my TGP radiator & intercooler & charge pipes, TGP plenum, TGP oil pan, TGP fuel rail with its FPR and injectors, and i won't be using the factory ECM controlled wastegate control...instead i'd rather just have full manifold pressure to the wastegate (what's that like 4psi?). if...when i go higher psi, i would rather use a grainger valve instead (works great on my GTS!). it's all going into a '91 Cutlass sedan and i've already swapped in a Getrag 282 5-speed a long time ago. i should have a ZIF socketed memcal and EERPOM from god910 sometime soon.

    is there anything i should watch out for? what about the chip considering it's going onto a NA 3.1 shortblock? i'd like to have fuel cut set as high as possible....like 14.5psi and NO boost cut at all. so far the only problem i see is the turbo support bracket i'll have to fab up since i'm using the 5-speed....

    any insight very much welcome....my GTS is my current daily driver and i'm ready to pull the engine out of my Cutlass....it just sits in the parking lot with expired tags while all of my TGP parts sit in the garage....
    '91 Cutlass Supreme sedan - 3.1 Intercooled Turbo / Getrag HM-282 5-speed - 13psi / lightly modded
    '98 Regal GS - 3800 Series II Supercharged/HM-4T65E-HD - 180* T-stat, otherwise stock


    GM W-body Forums

  • #2
    If your getting a chip from Jay(god910) then just ask for him to use the .bin he got from Kenny(TGPilot). The boost/fuel cut on that chip is set at 11.66 psi if I remember correctly. That chip has a lot of similarities with a topgun chip.
    \'89 Ciera Int. Coupe
    \'89 TGP

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    • #3
      that is the .bin i want, but i want to know if there are any changes i should have done due to the *slightly* higher compression of the motor i will be using it on. i figure it is such a slight difference that it shouldn't matter? most of the difference is probably just that the 'T' motor isn't quite as strong as the 'V' motor right?

      hopefully i will have a PC, PP and GMPCM software so i can make my own changes to the EEPROM at a later date (like when i finally get the 'V' motor in the car).
      '91 Cutlass Supreme sedan - 3.1 Intercooled Turbo / Getrag HM-282 5-speed - 13psi / lightly modded
      '98 Regal GS - 3800 Series II Supercharged/HM-4T65E-HD - 180* T-stat, otherwise stock


      GM W-body Forums

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      • #4
        The short blocks are basicly the same...considering the only diffrence is the nickle content in the block, if the pistons are the Mahle type, and the hardend crank.

        You shouldn't have a broblem at the low boost. But when you go past 9 psi...the computer will pull timming. The reason why is the heads. I've notice that the original TGP and Lumina Euro heads have smother combustion chambers, and unshrouded valves (also the lower compression). But it won't be that bad.
        88 Beretta GTU turbo . 90 Black ASC/McLaren TGP, awaiting 4t80. 2003 Grand AM se 3400/4t45 daily grind.

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        • #5
          no problems boosting my vin t motor in the cavy.

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