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  1. #1

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    Would you replace this?

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    I pulled my j pipe off so I could remove the water box and do the mod. When I looked at the exhaust manifold I saw a piece at the end of the manifold missing. Looking at the j pipe I don't see any exhaust carbon on the outer edges, actually the carbon markings inside the j pipe flange are pretty much the same all around. I guess my question is
    1. Should I replace the manifold (again..don't ask)
    2. On the water box, do you guys replace the rubber insulator. I know Riva's pro box doesn't have one.
    3. For this water box mod I thought I remember reading that you cut an 1" or 1 3/4" off the end of the j pipe. I know that I have to remove the pipe inside the box and holesaw a 5" hole in the baffle.

    This is on an 05 RXT w/ x charger 42's, 4" intake, rrfrp, he fizzle external ic, etc. And I just had this manifold tapped for an o2 sensor, it's an 08 manifold

    Any help would be greatly appreciated
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  2. #2
    Boost addict hotbird's Avatar
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    I would cut the bell off. Or buy a new one and sell this one to someone that runs a turbo and will cut the bell off.

    I have a extra manifold from a 05 if you want it pm me.

    Your most likely running lean and the egts are to high melting that and slowly eroding it away.

    Check over the water box and couplers for signs of heat damage. and look into your AFR to see whats up.

  3. #3
    skigolfnut's Avatar
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    mine looked just like that after a endurance race in Madisonville, the exhaust gets red hot when your getting lean, I used to have the J pipe set up, It will be fine,

    I went with the 08 style exhaust and my new exhaust manifold already had the bell cut off completely,
    do you have a way to monitor your afrs?
    as soon as anyone gets a external intercooler, its an absolute must to monitor your AFR's,

  4. #4
    AtoMIC_OraNGE greenbullet's Avatar
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    mine looks like that ... its fine... as long as your afrs are in check your ok .

  5. #5
    ncdoo's Avatar
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    Mine looks like that, they get very brittle on the end from the heat. Run it.

  6. #6
    Boost addict hotbird's Avatar
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    so I always wondered is there any gain/loss with a supercharger setup to cut the bell off?

    I would say if there is no negative effect just cut it off flush.


    http://tapatalk.com/tapatalk_image.p...ZTN5cS5qcGc%3D

  7. #7
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    Quote Originally Posted by Mau5head View Post
    Ehhh I wouldn't use it. You want to make sure you have good clamping force on the exhaust system. I have a 08 one I just got in today. Let me know if you want it.
    The bell has nothing to do with clamping force on the exhaust system.

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  9. #8

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    I do monitor my afr's (innovate mtx-l). I'm running mid to high 10's at idle a low to mid 11's at mid throttle and wot I'm between 11.8-12.2-12.4. I just can't seem to get the low and mid range anywhere near 11.9-12.2 range. I posted the issue I'm having with the afr's being off and got a lot of responses telling me not to worry too much about the low and mid throttle but to make sure that the wot range is between 11.8/9 - 12.1/2, and that's pretty much where it's been. So I guess the next question is, shouldn't the exhaust temp sensor have alerted I'm not sure maybe it didn't get hot enough. I have a Candoo and I'll try to activate that sensor just to be sure it's working as it should.
    Thanks guys for all of your input

  10. #9
    skigolfnut's Avatar
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    do you have a RRFPR? if so is your reference line hooked up?
    Also if you are running low octane fuel it heats up quickly, higher octane fuel runs cooler,

  11. #10

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    skigolfnut, yes I do have a rrfpr (from GH)and the ref line is hooked up, and I run nothing but hi-test fuel. no chance it could be a bad casting eh? (I know, wishful thinking)So basically it's getting hot but not hot enough to set off the exhaust temp buzzer.
    On another note, when doing the mod for the water box, I thought I read on GH that you cut the end of the tube on the j pipe an inch or so.

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