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  1. #1
    mrbtd's Avatar
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    Compression / Free Flow exahust

    I have seen some conflicting information on the Free Flow exahust - hoping you guys can help clear it up.

    Would like to run compression right @ 150. I understand the free flow could lower the chances of deto but is it necessary ?

    I strongly prefer the stock exhaust due to the sound. Does this mean I should lower the compression ? I would like to err on the side of caution.


  2. #2
    Happily Self-Employed WFO's Avatar
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    What year boat ?

  3. #3
    mrbtd's Avatar
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    Sorry... 2001 1200 GPR

  4. #4
    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by mrbtd
    Sorry... 2001 1200 GPR
    Go with the freeflow. It will greatly reduce the chance of detonation. The 1200 waterbox is different from the 1300.

    You can use PVC pipe instead of the metal pipe to deaden some of the sound.

  5. #5
    mrbtd's Avatar
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    Is that to say I could use a 1300 waterbox and the sound resonator instead of the free flow ?

  6. #6
    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by mrbtd
    Is that to say I could use a 1300 waterbox and the sound resonator instead of the free flow ?
    Sure.

  7. #7
    philip_gpr's Avatar
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    I am running 170 lbs without a FF using a 1200 exhaust set-up.

    I was at 160, when I went to 170 my rpms stayed the same so anything higher than 160 would appear to be a waste (for top end anyway).

    I have easy access to Sunoco 94 and I have lowered my timing advance.
    Last edited by philip_gpr; 09-25-2006 at 09:25 PM.

  8. #8
    I have an 02' 1200 ported and I'm using the rubber 1300 free flow tube. It's much easier on the ears and has a good throaty rumble to it.

  9. #9
    75 + Single's Avatar
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    Thumbs up

    MRB
    I have been running the stock exhaust on my 1200 GPR with a 150lb Protec head for 99 hours w/no problems (with or without d plate). I much prefer it to my old noisy free flow GPR.

  10. #10
    jgustman's Avatar
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    I just did a back to back test on my 2001 with 145 psi. compression and the free flow actually pulled 20-30 more rpms. I was able to gain back the rpms by leaning out the high speed screws another 1/8 turn, but I don't feel comfortable doing that to gain speed back compared to the free flow.

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