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PTU Mount on Evo3 Intake Manifold

Posted by 99OZDSM, Jan 29, 2020

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  1. 99OZDSM

    99OZDSM Proven Member

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    Joined Jun 16, 2007
    Virginia Beach, Virginia
    I am wondering where and how everyone mounts their PTU with the Evo3 IM? I have the Evo3 manifold and the Evo3 coil bracket and there is no obvious place to mount the PTU.

    I searched and found examples of mounted and unmounted PTUs. From my understanding, the PTU should be grounded to a bracket. The back side of the connector is bare metal (picture attached), which indicates to me that this holds true. Or at the very least, the bracket acts as a heat sink for the PTU. Please correct me if I am wrong.

    Should I make a bracket? Try to make the old bracket fit? Run PTU unmounted? What have you guys done?
     

    Attached Files:

    2K  6

    1998 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  2. bluespunk

    bluespunk Proven Member

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    Joined May 29, 2011
    Chicago, Illinois
    I have an rvr manifold, basically the same thing. My bracket looks completely different. Closer to a 1G style one. I just use the bolt hole for the 90 degree bend to bolt it to the manifold on an unused bolt hole behind the fuel rail on the manifold. It's gotten a bit stripped out from taking it on and off, so I started using the top of the manifold.

    here's a 1G one. Not exactly what i have, but similar enough and could probably find one cheap. My car's parked about 200 miles away, or I'd snap some pics for you.
    115-large_default.jpg
     
  3. bluespunk

    bluespunk Proven Member

    83
    16
    Joined May 29, 2011
    Chicago, Illinois
    Here's an old shot of my manifold before I had it powder coated. I used a bracket similar to the one in my post above to mount it to either of the circled holes. The bottom one kept the sensor behind the rail, but I found it stripped out over time as I had to keep pulling it off to get at the fuel rail for swapping injectors and fixing seal leaks. eventually, I switched to turning the connector toward the motor and bolting it to the top bolt hole. Both are m6 thread IIRC and take about a half inch long bolt.

    PDU mounts.PNG
     
  4. DSMPT

    DSMPT Proven Member

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    Joined Jun 12, 2014
    Japan / Mexico, Arizona
    When I had the EVO intake manifold in my 2g, I vertically mounted the PTU on the coil bracket the same way as the EVO 1/2/3. Like the pics. My coil/PTU brackets weren't from EVO but the mounting points are the same as EVO's.
    There should be a M8 threaded bolt hole on the coil bracket (where the blue circle is) and the lower coil bracket mount bolt, those two points are the EVO 1/2/3 stock PTU mount location.
    The last two pics are the stock EVO1/2/3 coil pack/bracket with the PTU, just for reference.
    DSC_1665.JPG
    DSC_1666.JPG
    DSC00003.jpg
    m129978137.2.jpg
    m129978137.1.jpg
     

    Drag Race Build 2K  7

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    Street Build 2K  4

    1998 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM
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  5. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    Independence, Kansas
    I ran mine unmounted, just laying in the runner valley. I left the bracket on for a heat sink but the car never cared.
     

    Street Build 5K  29

    1992 Eagle Talon TSi AWD
    14.74 @ 117.04 · 1G DSM

    2K  15

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    936  18

    1967 Chevrolet Camaro RS
    rwd · automatic · Misc Vehicles

    Street Build 1K  7

    1998 Eagle Talon TSi
    fwd · manual · 2G DSM

    Street Build 6K  15  25

    1990 Eagle Talon TSi AWD
    13.620 @ 108.460 · 1G DSM
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    curt-s likes this.
  6. Vegas Smith

    Vegas Smith Proven Member

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    Houston, Texas
    IMG_0775.JPG IMG_1488.jpg
     

    Street Build 4K  4

    1993 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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    1990TSIAWDTALON likes this.
  7. b00stedtalon2

    b00stedtalon2 Proven Member

    1,069
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    Detroit, Michigan
    I bolted mine to the firewall when I used the evo 3 manifold. It can get it's ground from there if that's true.
     

    2K  1

    1994 Mitsubishi Evo
    automatic · Lancer Evolution

    Street Build 4K  1

    1993 Eagle Talon TSi AWD
    9.585 @ 143.96 · 1G DSM
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  8. Vegas Smith

    Vegas Smith Proven Member

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    Houston, Texas
    I was under the impression the PTU has it's own ground wire and that the metal casing is just a heat sink.
     

    Street Build 4K  4

    1993 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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    curt-s and 1990TSIAWDTALON like this.
  9. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    Independence, Kansas
    I never grounded mine, it just sat there, willy nilly but on its bracket for heat dissipation.
     

    Street Build 5K  29

    1992 Eagle Talon TSi AWD
    14.74 @ 117.04 · 1G DSM

    2K  15

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    936  18

    1967 Chevrolet Camaro RS
    rwd · automatic · Misc Vehicles

    Street Build 1K  7

    1998 Eagle Talon TSi
    fwd · manual · 2G DSM

    Street Build 6K  15  25

    1990 Eagle Talon TSi AWD
    13.620 @ 108.460 · 1G DSM
    Loading...
  10. 99OZDSM

    99OZDSM Proven Member

    263
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    Joined Jun 16, 2007
    Virginia Beach, Virginia
    Thanks for all the ideas guys. I think I'm going to make a bracket behind my manifold like vegas or make a small bracket like the oem evo 1-3. Most likely the bracket behind the manifold as I need a place to mount my MAP sensor (to log boost and potentially go speed density at some point).
     

    2K  6

    1998 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
    Loading...
  11. DSMPT

    DSMPT Proven Member

    966
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    Joined Jun 12, 2014
    Japan / Mexico, Arizona
    I am wondering if your car is 1G or 2G. I was assuming yours was 2G. If a 2G with the harness in the stock location, I don't think you can reach to behind the intake manifold or the firewall without rerouting/rewiring the harness. That's the reason why I mounted it to the EVO stock location because it's the closest to the 2G stock location.
     

    Drag Race Build 2K  7

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    Street Build 2K  4

    1998 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM
    Loading...
  12. Vegas Smith

    Vegas Smith Proven Member

    4,040
    1,887
    Joined Dec 2, 2002
    Houston, Texas
    Well you would need to pay me royalties if you steal my idea ;)
    It actually was used with my old map sensor and is great location for either and is also hidden.
     

    Street Build 4K  4

    1993 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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