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  1. #1
    Lurker Timm's Avatar
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    Coolant Elbow Leak. Formerly L36 to L67 Conversion Questions

    I picked up a LOT of supercharger stuff for EXTREMELY cheap. Listed as follows.

    Eaton GenV(5) m90 supercharger
    Alternator
    Lower Intake Manifold
    and
    L67 Harmonic balancer

    and the best part....
    ALL FOR $80!

    but it gets even better....
    ALL BRAND NEW!

    ---------------------------ENGINE-UPDATE------------------------------------
    My 3800 sII is plagued with the dreaded coolant leak.
    We just replaced the upper intake gaskets (Under the plenum, and on the TB)
    We kept the same plenum and I'm 70% sure that's where the leak is.
    Because it's leaking again......badly.

    The coolant level in my in the overflow tank drops about 3/4 of an inch each day.
    I only drive maybe 20 miles per day (Non aggressively).
    And now my gas mileage is CRAZY LOW!

    I want this fixed before winter when it gets too cold to work on my car.

    ------------------------------IDEA-UPDATE--------------------------------
    Maybe put my new supercharger on the car?
    Not have to buy a new upper plenum?

    -----------------------------QUESTIONS-----------------------------------
    1) Will this require removal of the engine from the car?
    I think it might, just to get the harmonic balancer off.

    2) Is the lower intake manifold the same in a 3800 sII and a 3800 s III? (both supercharged.)

    3) How much re-wiring will have to be done?

    4) Is a new PCM needed?

    5) Will a L67 fuel rail fit on the Eaton m90 GenV?

    6) Will my TB bolt into the SC with no problems?

    7) Are there any cheap (but functional) bolt sets for the SC and LIM?

    8) Will this even fit in my car? (Dimension wise)

    9) How much (estimate) would it cost to get the aluminium plenum from a series III, and the throttle body adaptor?

    10) Should I just get another plastic series II plenum?

    95 Vert - Stock L67 Swap ***** 95 Vert - L36, Cam, Headers, Gen V M90 ***03 Vue 2.2L 5-speed
    *****Emmas DD*******************Tims Huge Monster Project************Tims DD*******

  2. #2
    Euro's Avatar
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    Re: L36 to L67 Conversion Questions

    Well first off let me just say that you're a bastard for getting the Gen V and all of that other stuff for less than $100. Is the LIM that you got the Gen V LIM? If it's not, then you'll have to get it machined to fit the Gen V.

    1. Taking the engine out is not needed.

    2. the SIII supercharged LIM will fit on a SII

    3. Ummmm not quite sure

    4. Yes, or just send it to ZZP or someone to get it reflashed/tuned for your setup

    5. Yes it should!

    6. I'm prettttyyyy sure that it won't.

    7. Not sure what you mean by functional bolt sets?

    8. Sure will!!!!

    9. You won't need a SII plenum, because the supercharger replaces the plenum. The SIII TB won't work with your car, because the TB is drive by wire, and not what we have.

    10. See above.

    I may have missed a few things, and others will chime in. I WAS going to link you to a ClubGP thread dedicated to doing the Gen V swap. However it's not there anymore
    -Matt
    2000 Regal GS - 160k - GSX grille, 4" K&N, 3" OR D/P, Borla Pro-XS, AL104's - retired before it even got in the game..
    2000 Grand Prix GT - 96k - L26, CAI - SOLD 4/9/11
    1994 Lumina Euro - 127k - Z34 grille, Monte Z34 16's, odds 'n' ends, Super Chevy award winner - SOLD 4/18/07

  3. #3
    88red4cyl's Avatar
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    Re: L36 to L67 Conversion Questions

    I've always heard that the L36 is a little weak to throw a supercharger on stock, or at least that the L67 had stronger internals than the L36 did...
    -Will

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  4. #4
    Euro's Avatar
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    Re: L36 to L67 Conversion Questions

    L36's are usually quicker when you strap a blower to it. Higher compression ftw.
    -Matt
    2000 Regal GS - 160k - GSX grille, 4" K&N, 3" OR D/P, Borla Pro-XS, AL104's - retired before it even got in the game..
    2000 Grand Prix GT - 96k - L26, CAI - SOLD 4/9/11
    1994 Lumina Euro - 127k - Z34 grille, Monte Z34 16's, odds 'n' ends, Super Chevy award winner - SOLD 4/18/07

  5. #5
    Lurker Timm's Avatar
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    Re: L36 to L67 Conversion Questions

    7) I need the bolts to get the SC bolted to the LIM, and to bolt the LIM to the block and heads.

    9/10) If I were to go the other route to get my coolant leak fixed, I'd need a new plenum. Just curious if I should get away from the supercharger idea, and just fix the plenum's coolant leak.

    95 Vert - Stock L67 Swap ***** 95 Vert - L36, Cam, Headers, Gen V M90 ***03 Vue 2.2L 5-speed
    *****Emmas DD*******************Tims Huge Monster Project************Tims DD*******

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    Re: L36 to L67 Conversion Questions

    Quote Originally Posted by 1996regal
    7) I need the bolts to get the SC bolted to the LIM, and to bolt the LIM to the block and heads.

    9/10) If I were to go the other route to get my coolant leak fixed, I'd need a new plenum. Just curious if I should get away from the supercharger idea, and just fix the plenum's coolant leak.
    IIRC that's like...$90 for the plenum fix, and another $40 or so for the LIM gaskets (might as well do those too while you have the plenum off). While you're at it, do the injector o-rings, thermostat gasket and seal, and so forth. Let me know if you're interested, as I just recently did this whole thing on a 96 Regal identical to yours.

  7. #7
    Forum Moderator GP1138's Avatar
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    Re: L36 to L67 Conversion Questions

    I do believe Shaun bought an L36 from a junkyard and threw the S/C on it. Might ask him what he had to do. PM digitaloutsider.
    John C. Wallace

    1991 Pontiac Grand Prix GTP - LQWIN! - 284 5-speed - Pioneer 9800bt - Keepin' the Early 90's alive!
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  8. #8
    Lurker Timm's Avatar
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    Re: L36 to L67 Conversion Questions

    There are plenty of guides for getting a m90 genIII on a L36, but not so much the genV...

    95 Vert - Stock L67 Swap ***** 95 Vert - L36, Cam, Headers, Gen V M90 ***03 Vue 2.2L 5-speed
    *****Emmas DD*******************Tims Huge Monster Project************Tims DD*******

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    Re: L36 to L67 Conversion Questions

    yea but isn't the trans what gives out. actually the diff
    <br />2001 Chevy Impala LS

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    Re: L36 to L67 Conversion Questions

    My first response would be say fuck all that n grab an N/A plenum out of a yard and just fix the problem. but since you got that entire setup for 100 bucks....


    I recommend trading your giant headache for a smaller one. sell all the series 3 stuff and go get yourself the series 2 replacements
    -Rob-&nbsp; <br />00 Protege ES 5 spd - busted trans mod removed in favor of working trans<br />96 Grand Prix L67/282 - Completed! For the most part my progress thread<br />[quote author=jake63]Kudos on the waking famous people burnout. I&#39;m sure it adds a certain extra level of pleasure to the casual everyday burnout![/quote]

  11. #11

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    Re: L36 to L67 Conversion Questions

    Quote Originally Posted by ismellrealbad
    My first response would be say fuck all that n grab an N/A plenum out of a yard and just fix the problem. but since you got that entire setup for 100 bucks....


    I recommend trading your giant headache for a smaller one. sell all the series 3 stuff and go get yourself the series 2 replacements
    Getting a new plenum from a yard will not fix anything, unless you get one off of late model 2nd Gen w-body with an L36, and even then you're putting in a used part that you can replace brand new for $90.

  12. #12
    Andrew's Avatar
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    Re: L36 to L67 Conversion Questions

    Quote Originally Posted by 1996regal

    -----------------------------QUESTIONS-----------------------------------
    1) Will this require removal of the engine from the car? no

    2) Is the lower intake manifold the same in a 3800 sII and a 3800 s III? (both supercharged.)
    no, however you will want a LIM that has been modified, because the fuels injectors enter at different locations between the l36/l67.

    3) How much re-wiring will have to be done?
    not much. there is a harness adapter set available.

    4) Is a new PCM needed? absolutely

    5) Will a L67 fuel rail fit on the Eaton m90 GenV? no, see #2. need ZZP fuel logs.

    6) Will my TB bolt into the SC with no problems? no, need an adapter

    7) Are there any cheap (but functional) bolt sets for the SC and LIM? no idea

    8) Will this even fit in my car? (Dimension wise) yes
    i dont know if ZZP or anyone else will tune a 96 pcm. i also dont know if they clearance GenV blowers for the conversion yet either. clearancing will be needed for the fuel logs that are needed.

    read this also.

    http://www.zzperformance.com/grand_p...=382&catid=109
    00 GTP - mine | 05 Mariner - hers | 95 F150 - ours?

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    Re: L36 to L67 Conversion Questions

    Quote Originally Posted by xtremerevolution
    Getting a new plenum from a yard will not fix anything, unless you get one off of late model 2nd Gen w-body with an L36, and even then you're putting in a used part that you can replace brand new for $90.
    I didnt read his original issue closely enough. after which, idk why it'd be the plenum in the first place, but he needs to make sure the leak/consumption isnt something worse before any generation of blower goes on there
    -Rob-&nbsp; <br />00 Protege ES 5 spd - busted trans mod removed in favor of working trans<br />96 Grand Prix L67/282 - Completed! For the most part my progress thread<br />[quote author=jake63]Kudos on the waking famous people burnout. I&#39;m sure it adds a certain extra level of pleasure to the casual everyday burnout![/quote]

  14. #14

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    Re: L36 to L67 Conversion Questions

    Quote Originally Posted by ismellrealbad
    Quote Originally Posted by xtremerevolution
    Getting a new plenum from a yard will not fix anything, unless you get one off of late model 2nd Gen w-body with an L36, and even then you're putting in a used part that you can replace brand new for $90.
    I didnt read his original issue closely enough. after which, idk why it'd be the plenum in the first place, but he needs to make sure the leak/consumption isnt something worse before any generation of blower goes on there
    Well I figured the "dreaded coolant leak" is caused by the known issue with early model L36 regals where the EGR stovepipe runs too close to the coolant passages near the throttle body and causes the plastic to become brittle and crack, causing leaks. The new plenum in the Dorman kit on rockauto includes a revised stovepipe that completely solves the issue.

    I just did this job on my girlfriend's sister's car. It can be done in 8 hours if you've never done it or anything like it before and have a Hayne's/Chilton's manual.

  15. #15
    Lurker Timm's Avatar
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    Re: L36 to L67 Conversion Questions

    I&#39;ve removed my intake plenum maybe 3months ago. Yes the gasket was melted. I replaced the gasket and nothing else. I should have also bought the plenum...

    I can&#39;t find any L36 plenum&#39;s on eBay...
    Anyone know where to get one for cheap (That is still good quality?)

    I think this link http://www.zzperformance.com/grand_p...=382&catid=109 just killed my dream... :-(

    95 Vert - Stock L67 Swap ***** 95 Vert - L36, Cam, Headers, Gen V M90 ***03 Vue 2.2L 5-speed
    *****Emmas DD*******************Tims Huge Monster Project************Tims DD*******

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