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  1. #1

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    3.4 DOHC Turbo Kit

    I was wondering if anyone had a complete list of what it would take to put a turbo on a grand Prix with a 3.4L. And if anyone knows how to get the engine back to the original 300 hp that it was originally intended to have. Would if be better to do that then the turbo or one or the other. And what will a stock 4T60-E withstand up to. Id like to reprogram it to have the 300. But it would be cool to have one with a turbo too. Also if I were to do either or. What hard parts or rebuild kits would I need to strengthen the tranny. I would like a complete list as I am new to the turbo and transmission rebuilding.
    Last edited by 94gp3.4; 09-14-2012 at 12:28 PM.

  2. #2
    Andrew's Avatar
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    USE THE SEARCH BUTTON.

    no list. all custom. 300hp a myth. trans is iffy.
    00 GTP - mine | 05 Mariner - hers | 95 F150 - ours?

  3. #3

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    Just wondering why is your thread for '3.4 DOHC turbo kit\ if you don't have a 3.4l? are you planning an engine swap to the 3.4?

    I think it was the plan for the LQ1 originally to have 300hp but it was detuned by GM so it wouldn't cannibilize other high performance gm cars from that era or something like that. They never produced the LQ1 with that hp maybe a prototype but I\m sure GM destroyed all the materials for it. would be next to impossible to try and replicate that now. major $'s. If it was easyish we would all have done it already and then begin work on turbo setup. If it was tru,e wbodys would be a lot more popular.

  4. #4
    (╯□)╯ Psych0matt's Avatar
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    theres a guy on 60 degree that has a turbo 3.4. I can't find the thread right now, but I'm on my way out the door to work, I'll look later and see if I can't find it. It is all custom though, lots of $
    '92 5 speed GTP - Mod list _____ '04 Grand Prix GT - Daily Driver


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    94gp3.4 (09-14-2012)

  6. #5
    RobertISaar's Avatar
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    want a 300HP LQ1? it's called the L37 Northstar.

    otherwise, making 300HP with a LQ1 while being N/A would require significant head/intake/exhaust rework, retimed(or different altogether) cams and a significant increase in compression.

    and after all of that, you hook a 4T60E up to it and kill it within the first couple of WOT shifts due to all of the power the engine making being at an RPM that the trans can't withstand. having a 4T60E shift beyond ~6000 or so significantly shortens the life of it, the 65 has the same issue, but the 4T80 would probably live through it.
    King of Code
    1995 Monte Carlo LS 3100, 4T60E... for now, future plans include driving it until the wheels fall off!



  7. #6
    Here's what I did:

    Two front exhaust manifolds, one bolted on each head.

    Modify the crossover with a Y to the turbo

    Remove bumper, relocate battery to trunk, and build intercooler piping from turbo, to air to air, back to intake plenum

    For oiling, tap into the oil pressure sending unit with AN line to the turbo, and a 3/4 inch back to the oil pan. Modify oil pan with fitting accept oil return.

    Gasket matched plenum and intake manifold

    P&P heads

    Polished pistons / valves

    For fuel, splice a FMU into the fuel return line

    Get a boost gauge and wastegate, set wastegate to 7-8 psi

    Tune, tune, tune, tune........

    I have most of my set up for sale currently, sold the turbo and wastegate a long time ago, scrapped most the piping. I do have an intercooler that works nice off a Saab.

    I also added a Meth kit for added safety.

    Mind you, while I did get this built, I never got to see it run before I had to demod for money reasons. It's not a cheap adventure, nor easy. Hope you or someone you know can weld, I did not know how so this was by far the most challenging part of the build.
    1978 Ford F150
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    2010 Mercury Milan Premier
    Gone: 88 F150, 89 Grand Am, 95 Caravan, 01 Jetta VR6, 03 Neon, 98 Regal

  8. #7
    Disbass69's Avatar
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    Why not just swap in a 3800? then turbo that. Much more power, more people have swapped and the aftermarket is endless.

    2005 Nissan Sentra Spec-V - Red Riceburner 2004 GSXR 10001992 LQWinning 284 GP (Round 2)
    Quote Originally Posted by WhatTheFehl View Post
    I don't always sell my Grand Prix, but when I do, I buy it back.

  9. #8
    Easier, cheaper of course. But the challenge was why i did it. More power? Anything is possible.

  10. #9
    RobertISaar's Avatar
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    stock for stock, a LQ1 at the same pressure level as a L36/L67 with a turbo is going to make more power.
    King of Code
    1995 Monte Carlo LS 3100, 4T60E... for now, future plans include driving it until the wheels fall off!



  11. #10
    Lurker
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    Ever had a ride in a turbo lq1? one of my chums from the local car club has a turbo lq1 in a fiero.. @ 7psi the top end pull is insane....
    Eric's-W's The GP collection.
    90 Red TGP LG5/282 155k cold A/C Fixxed atm!!
    98 GT Sedan L36/4t65e Stock.. 151k DD
    Quote Originally Posted by skitchin View Post
    If you want the loudest most obnoxious shit box sounding car with no chance of a female riding in it, hack the mufflers off.

  12. #11
    Night Fury's Avatar
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    I can only imagine. I would JIMP
    -Buck W.
    ****1996 Chevrolet Silverado Z71, 4x4 5.7 V8, auto, 168,000 miles****
    ****1993 Ford Festiva GL, Swapped 1.6 SOHC I4, 5-speed, 135,000****
    ****1988 Pontiac Grand Prix SE, 2.8 V6, 5-speed 282, 282,000 miles****


    ^^^Bi-polar bitch. The epitome of the phrase "A GM will run poorly longer than most cars run at all"

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