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  1. #1

    anything special with 7400 ?

    My rpms have hit 7400 and stay there.

    I have split water ways and a wide open washer.

    I'm about to put it back to stock with the normal route to the external IC.

    Does anyone know of anything else that could cause this.
    My exhaust baffles burn out ?


  2. #2
    Quote Originally Posted by Kinchyle View Post
    My rpms have hit 7400 and stay there.

    I have split water ways and a wide open washer.

    I'm about to put it back to stock with the normal route to the external IC.

    Does anyone know of anything else that could cause this.
    My exhaust baffles burn out ?
    High intake air temperature.

  3. #3
    shhr's Avatar
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    how did it run when you first hit the water (when everything was not heat soaked)

  4. #4
    thanks for the troubleshooting. As I was redoing my water lines I noticed my supercharger to TB was knocked off....

    7400rpms = no SC

    Fixed it and rode the cumberland. All seemed well. Even hit a high of 70.2.

    With the water lines back to stock the water pressure seems to stick around 40psi and 8100 rpms. Funny thing is at the lower rpm the water doesn't even cause any pressure... Not until about 5000-6000 does it make it to about 20.

    This whole time I was thinking something was up with my split waterways because it was showing the same behavior.

    I think I'm going to do them like PR and do split waterways. Seems clean anyways. Just need to find a 3/4 tap for the PPG OPAS blockoff plate on the back of the RXT/GTX

  5. #5
    Water4fire's Avatar
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    Are you saying we only have 40p.s.i. in are waterlines to the IC's?

    If so that isn't bad at all.

    I test them to 90p.s.i.

    .

  6. #6
    GTXX's Avatar
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    use 1/2" pipe tap for the plate then you can use common brass fittings to go through the plate. I did mine a couple of weeks ago and hope try it out tomorrow. If your plate is stainless like mine was, I'll go ahead and warn you that it's a job to tap it. I'll try to get some pics of what I did this weekend an PM them to you.

  7. #7
    Kinch is your 40psi reading with the larger washer?
    one thing to consider is maybe the pressure increases the closer you get to the exit. I know the OPAS port is only about 2 inches farther back, it could be dif... I was reading mid to high 50`s with the 9mm restrictor in my set up. There are many variables, full flow fittings, hose ID, even prop pitch and rpm`s...PR...

  8. #8
    Quote Originally Posted by Pale Rider View Post
    Kinch is your 40psi reading with the larger washer?
    one thing to consider is maybe the pressure increases the closer you get to the exit. I know the OPAS port is only about 2 inches farther back, it could be dif... I was reading mid to high 50`s with the 9mm restrictor in my set up. There are many variables, full flow fittings, hose ID, even prop pitch and rpm`s...PR...
    I have the stock washer in (yellow). It goes to the back of the IC. The IC then went (about 1.5 feet) to my pressure gauge which has a max psi needle. The pressure guage went to the stock tube that goes to the manifold (which is cut back about another foot). My IC uses full flow 90 bends on both sides.
    http://www.westmarine.com/webapp/wcs...allpartial/0/0

    I think higher pressure would denote more back pressure wouldn't you ?
    I think it's optimal to have lower pressure, with more flow (gpm).
    I'm REALY wanting to hook up my gpm guage but it's a monster and like 4 pounds. Have to figure out where to mount it. If your fittings (flow) are optimal then I think just making sure the psi lines up works fine.

    I'll try to post pictures, soon.

    I was reading 40-42psi at 8100. Never seemed to get past that no matter how many times I reset the needle.

    I have a RXT stage 2 with a 14/19 solas.

    I know these...
    IC needs uncloggable/filtered water
    Manifold just needs 40-50pis cool water

    It doesn't make since to me to warm up the water then send it to the exhaust and with the IC using filtered water, leaving the possibility to slow the flow and leave overheating to the manifold.

    I'm going to do the OPAS split like you did PR.

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