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  1. #1
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    Mercury 300xs HT tuner + poppet valve diverter?

    Hello,

    Just orderd a hydrotec tuner for my Mercury 300xs I have already a DBR flash and lightweight flywheel and was looking for a tuner that helps a little above 6000 rpms (And offcouse the sound ) read good things about the Hydrotec and found 1 second hand never installed.

    My question:

    The package I orderd include also a poppet valve diverter. I am a little affraid that my mid section become to hot any expierence from people that went the same way? Will the paint go off or just more cleaning work? I will use my stock 20 inch mid section.

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    Thanks
    Last edited by darkdream; 12-10-2020 at 05:16 AM.
    Boat: Hydrostream virage
    Engine: Mercury 300 XS DBR 1.3
    Props: 32' performance drag4 ,buckshot gen2 4 blade cleaver 34'
    Max speed: 113mph

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  3. #2
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    No experience with running poppet valve diverters on a 300xs?
    Boat: Hydrostream virage
    Engine: Mercury 300 XS DBR 1.3
    Props: 32' performance drag4 ,buckshot gen2 4 blade cleaver 34'
    Max speed: 113mph

  4. #3
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    Just a update, it runs fine after 2 years no problems with heat on mid section or loosing paint ,mid range better and sounds like a beast. Installed both poppet valve diverter + Hydrotec exhaust tuner

    https://youtu.be/rPcvDkXF3EY
    Boat: Hydrostream virage
    Engine: Mercury 300 XS DBR 1.3
    Props: 32' performance drag4 ,buckshot gen2 4 blade cleaver 34'
    Max speed: 113mph

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  6. #4
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    do you find it a bit lazier on takeoff? when i switched from stock tuner to hydrotec on my 250xs a hesitation developped when trying to get on plane. i taught that maybe the shorter lenght of the tuner vs the full lenght I had now needs more exhaust pressure to ''fill'' the can and push it out the exhaust.

    I've since switched to a 300x and kept the tuner. seems to still have that hesitation on takeoff. and i need all 8 PVS holes open on trough hub props to get the prop to spool up and get on place.
    1998 charger stv. 225 promax. -sold-

    1993 22 talon. 2016 yamaha 200 SHO, nizpro tuned



  7. #5
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    Hi ,

    No for me it works little better with holeshot but I use small hub props and need to put throttle to the floor (small exhaust loose bottom end torque and gain hp high rpm). But mid range and higher rpms its a lot better for sure. Think through hub props its a way harder due to less exhaust gas
    Boat: Hydrostream virage
    Engine: Mercury 300 XS DBR 1.3
    Props: 32' performance drag4 ,buckshot gen2 4 blade cleaver 34'
    Max speed: 113mph

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