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Thread: Rear exhaust routing with IRS

  1. #1
    Senior Member FF33rod's Avatar
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    Rear exhaust routing with IRS

    Did a search to find a thread dealing with this but didn't come up with anything. Seems likely someone has dealt with this already but darned if I can find it.

    The instructions on the FFR web site for installing and routing the rear exhaust are outdated. The manual has a section for the rear exhaust option which seems more up to date but following it has its problems.
    The manual suggests routing it just above the center section like this

    IMG_2845a.jpg

    However, clearance to accomplish this is next to none.

    IMG_2848a.jpg

    In addition, the instructions suggest cutting two holes off the top of the hanger strap but the strap barely reaches the cross bar as is never mind after cutting it. Seems like something is just wrong.

    I've noticed at least 1 other person moving the loop over the rear end outboard like this:

    IMG_2851a.jpg

    Clearly I'd have to redo the brake lines (not happy about that) but this routing sure gives much better clearances:

    IMG_2849a.jpg

    Is that what everyone is doing now or am I missing something?

    Thanks for the help
    Steve
    Gen 1 '33 Hot Rod #1104
    347 with Holley Sniper & Hyperspark, TKO600, IRS, 245/40R18 & 315/30R18, DRL, Digital Guard Dog keyless Ignition

  2. #2
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    I did it like your first pic shows. Clearance was OK and I had to cut my hanger straps.

    DSCN2056.JPG
    '33 Hotrod, #1047 Gen 1, delivered on 2/27/18, go cart on 9/24/18.
    LS3 w/Gearstar Level 3 4L65e Tranny, Yank converter, Lokar shifter, Electric PS, Vintage AC/Heat/Def, 8.8" 3.55
    TorqThrust II Wheels w/Toyo Proxy T1 Sport Tires, F 235/45ZR17 R 295/35ZR18
    Garage Built, Driveway Painted.

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  4. #3
    Senior Member FF33rod's Avatar
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    Quote Originally Posted by JimLev View Post
    I did it like your first pic shows. Clearance was OK and I had to cut my hanger straps.
    Hmmmm. When you say OK, was it 1/4 or more? I think you can see from pic #2 I'm looking at 1/16
    Gen 1 '33 Hot Rod #1104
    347 with Holley Sniper & Hyperspark, TKO600, IRS, 245/40R18 & 315/30R18, DRL, Digital Guard Dog keyless Ignition

  5. #4
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    A 1/4" or better. Clearance will depend on everything from the engine all the way back.
    We have different engines so the position of the engine exhaust manifold may be slightly different.
    Last edited by JimLev; 05-20-2019 at 11:26 PM.
    '33 Hotrod, #1047 Gen 1, delivered on 2/27/18, go cart on 9/24/18.
    LS3 w/Gearstar Level 3 4L65e Tranny, Yank converter, Lokar shifter, Electric PS, Vintage AC/Heat/Def, 8.8" 3.55
    TorqThrust II Wheels w/Toyo Proxy T1 Sport Tires, F 235/45ZR17 R 295/35ZR18
    Garage Built, Driveway Painted.

  6. #5
    Senior Member AJT '33's Avatar
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    I routed it like your second pic as I could never get the right clearances. Now how a lot of play and also the tips line up with the lights which I like better for the look.
    20181201_140256.jpg 20180901_094635.jpg 20180901_094629.jpg 20180522_111638.jpg
    I used the extra hole where the shock connects for the mounting bracket as well.
    Black & Copper #1028 ("The Mistress" according to my wife! )
    Brought home: Nov. 2017, GoKart: May 2018, will be Plated & on the Road April 2020
    Andreas

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