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Thread: GTM Gen2 Carwash watertight?

  1. #1
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    GTM Gen2 Carwash watertight?

    Trying to complete my car, i bought it 80% done wink wink, and...

    Am I naive in trying to make the car, excluding the door windows for now, carwash watertight?

    I am finding lots of places with potential water/air leaks.

    Upper rollbar though the rear window bulkhead.
    Lower outer seatbelt mounts.

    Being just a couple of examples.

    Just asking

  2. #2
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    Lol!
    Kit #361, arrived 10/2015, still in progress
    818C highly modified, corvette suspension
    Estimated completion summer 2023!
    1989 turbo Supra 5 sp
    2017 Tundra

  3. #3
    Senior Member beeman's Avatar
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    I think the more reasonable goal is to not get soaked if you get caught in a light rain.
    MK3.1 2004 Mach 1 donor. ABS, PS, TC.
    GTM #304 LPE 525hp LS3
    2000 C5 Lingenfelter LS1@489hp
    1999 Corvette FRC/Z06 track car

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    I was unable to find an incomplete GTM at a reasonable price, so I settled for an 818. Based on my experience with that factory five car.... The only hope you have of making it water tight is to completely disassemble it and build it from the ground up with that intention from the start, and be prepared for tons of customization. It is in no way from the factory capable of such a task.

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    Quote Originally Posted by Ajzride View Post
    I was unable to find an incomplete GTM at a reasonable price, so I settled for an 818. Based on my experience with that factory five car.... The only hope you have of making it water tight is to completely disassemble it and build it from the ground up with that intention from the start, and be prepared for tons of customization. It is in no way from the factory capable of such a task.
    Agreed!
    Kit #361, arrived 10/2015, still in progress
    818C highly modified, corvette suspension
    Estimated completion summer 2023!
    1989 turbo Supra 5 sp
    2017 Tundra

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    Now I, and my car, feel normal!

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    Can I watch? I have popcorn...
    Jim
    2016 Mk4 Challenge Car, IRS, 3.31 Torsen, RDI Aluminum 427w, AFR 225s, Vic Jr. ProSystems 780 HP, TKO-600 w/Liberty mods. Forward cage. Levy 6/4 piston Wilwoods. Not completed yet, will be a streetable track car.
    2004 Superformance MkIII #1855, 2007 Superformance MkIII #2584 purchased in 2012 both sold.

  8. #8
    Member kabacj's Avatar
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    Quote Originally Posted by doug_porsche View Post
    Trying to complete my car, i bought it 80% done wink wink, and...

    Am I naive in trying to make the car, excluding the door windows for now, carwash watertight?

    I am finding lots of places with potential water/air leaks.

    Upper rollbar though the rear window bulkhead.
    Lower outer seatbelt mounts.

    Being just a couple of examples.

    Just asking
    Well considering your car is already built, it’s definitely harder, but HVAC foil tape is your friend. It’s super sticky and will make openings air and water tight.

    I race in the rain with the windows open, but keeping stuff reasonably dry inside is important to prevent fogging. Tapping up the seams and openings will help.

    Harder to do on an already built car but it’s possible.
    XTF #2
    build start date June 19 2023

    GTM # 344
    Build Start December 2010
    First track day April 2013

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  10. #9
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    Having built over 17 FFR kits including a GTM you have little to no chance of ever making one of these kit cars car wash water tight. Plus IMO you should never run one of these in a car wash. Just my 2- cents. Hope you make me eat my words but I would not bet on it, LOL. Best of luck and enjoy your GTM.
    16+ FFR kits and counting!

  11. #10
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    Use light and a good "gutter seal" product. In a darkish garage use a drop light from outside the car to look for light coming through from the inside. This is easiest done with two people. One on the outside moving the light and the other on the inside marking areas where light comes through. Once all the areas are marked, decide if the HVAC tape or the gutter sealant is more appropriate(I use both) to seal the area.

    We race in the rain at better than 150 MPH and have gotten it pretty well sealed. Remarkably the open windows do not have much water coming in them while at speed.

    I do not believe any GTM will ever be car wash sealed.

    Here's what I use.

    https://www.bestmaterials.com/detail...tent=Adhesives
    Last edited by crash; 06-26-2023 at 02:01 PM.
    www.myraceshop.com

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  13. #11
    VRaptor SpeedWorks, LLC's Avatar
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    Quote Originally Posted by doug_porsche View Post
    Trying to complete my car, i bought it 80% done wink wink, and...

    Am I naive in trying to make the car, excluding the door windows for now, carwash watertight?

    I am finding lots of places with potential water/air leaks.

    Upper rollbar though the rear window bulkhead.
    Lower outer seatbelt mounts.

    Being just a couple of examples.

    Just asking
    When we build a car from scratch, that is always the goal. It's not that tough to do when building.....where there is a seam or gap that leads to the outside, seal it up with caulk or foil tape or weatherstrip. Yes, the door windows will always be the exception, but the rest of it really should be done anyway.....for 2 reasons.

    1. If you drive on wet roads, do you want the carpet and interior to get wet and moldy? If you don't seal everything up, it will.
    2. Anywhere that water can get in, so can heat and exhaust fumes (as in you example of the area around the seat belt mounts and halo tubes). If you don't seal those areas up 100%, you will get a ton of heat coming in from the engine bay. FFR provides close-out panels to seal those areas off.....but of course, they require a bit of extra work to actually seal them....again....application of tape, caulk or weatherstrip where necessary.
    Shane Vacek
    VRaptor SpeedWorks, LLC
    www.vraptorspeedworks.com
    Turn-key GTM, SL-C & Ultima GTR Built to Your Specs!
    Offering a full line of GTM Upgrades and Custom Parts

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