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  1. #1
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    300xs open exhaust? raise compression?

    has anyone run a 300xs with a mad efi mid with open snout like on a 2.5 offshore mid? Also have not read any post on cutting dfi cyl heads. I see post where people cut the 3.0 efi o-ring heads. any reason it is not being done on the dfi motors?

  2. #2
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    Opening the exhaust is no issue but it will need to be mapped if you want to add some more squeeze.
    Quartershot T-3R 15" 3.5L E-Tec 1.62 Sportmaster


  3. #3
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    I am thinking the motor will have idle issues and may have dead spot coming off idle. I guess if a certain someone on here would work a little faster. we will know how it affects it.

    what about the dfi head cutting? has anyone tried raising compression 20lbs or so and get any gains?

  4. #4
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    Yea he needs to stop painting chit metal flake and screw it together
    Quartershot T-3R 15" 3.5L E-Tec 1.62 Sportmaster


  5. #5
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    Quote Originally Posted by davemvegas View Post
    I guess if a certain someone on here would work a little faster. we will know how it affects it.

    what about the dfi head cutting? has anyone tried raising compression 20lbs or so and get any gains?
    Subscribed

  6. #6
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    Quote Originally Posted by davemvegas View Post
    has anyone run a 300xs with a mad efi mid with open snout like on a 2.5 offshore mid? Also have not read any post on cutting dfi cyl heads. I see post where people cut the 3.0 efi o-ring heads. any reason it is not being done on the dfi motors?
    HHHmmmm.... Interesting....


    Quote Originally Posted by baja200merk View Post
    Yea he needs to stop painting chit metal flake and screw it together

    Last edited by motorheadbishop; 01-02-2014 at 08:14 AM.


    • Hydrostream V-King with a Drag - SOLD
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  8. #7
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    Quote Originally Posted by Kcraft View Post
    Subscribed
    Here ya go Kcraft...
    I just need to add my (S)...


    • Hydrostream V-King with a Drag - SOLD
    • STV RR Drag with a Drag- SOLD
    • 18' seacraft c/c 200 merc- SOLD
    • 18' Action Marine Retired & "Wet"
    • STV Needle Nose " The Heat" - SOLD
    • 21' Triad- "The Sipper"- SOLD
    • 26' concept c/c twin 200 Mariners -SOLD
    • STV RR - "Lil Sista" on a Strongback Trailer
    • 18' Action Marine on a Strongback Trailer


    Everybody wants a piece of the pie, till they try it!!!


  9. #8
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    Quote Originally Posted by motorheadbishop View Post
    Here ya go Kcraft...
    I just need to add my (S)...
    I do prefer the look of a 2.5 style mid that you chose over the 3L X style that I am running...

  10. #9
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    i know on my HPDI yamaha the heads were cut. and i ran 135psi where a stocker would be 115 to118
    22 Talon w/ 300 HPDI

  11. #10
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    Etec DI's actually lose HP with extra compression in stock form.
    Larry Gempp Jr.

    Proud HydroStream Powertour Member

    2017 RXP-X 300
    2016 Quartershot T3R
    28 Skater
    2004 HydroStream Venom - 3.4 Etec - August, 2011 S&F Boat of the Month

  12. #11
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    What's the compression supposed to be on the 300xs?

  13. #12
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    the Manuel shows 100 to 110psi as being good. I know of a few 2013 motors that have 140 to 145psi. my 2007 300xs has had 110 since I bought the boat with 27 hrs. both my 2013 motors have 140. I just swapped my 07 motor yesterday with one of my 13 motors. I am curious if the 30psi will make any more speed. it does not sound any different on the hose. I am sure my 07 motor is not wore out. pretty slim chance since it had 110 at 27hrs and now with about 100 hrs it still has exactly 110psi on all six.

  14. #13
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    Quote Originally Posted by davemvegas View Post
    the Manuel shows 100 to 110psi as being good. I know of a few 2013 motors that have 140 to 145psi. my 2007 300xs has had 110 since I bought the boat with 27 hrs. both my 2013 motors have 140. I just swapped my 07 motor yesterday with one of my 13 motors. I am curious if the 30psi will make any more speed. it does not sound any different on the hose. I am sure my 07 motor is not wore out. pretty slim chance since it had 110 at 27hrs and now with about 100 hrs it still has exactly 110psi on all six.
    Im curious about that as well.Are there different numbers on the 2013 heads then on the 07 heads?I have a 07 as well,it has a DBR 1.1 kit but ive always wondered what a few more psi would do?I was told there may be issues with the air injectors.

  15. #14
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    Just my 2cents when I got my 300xs one of the first ones I put it on my 15inch mad efi mid and it was a pig out of the hole and pyros where quite high to.
    They run very lean id want to add fuel b4 cutting heads.

  16. #15
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    Larry Gempp Jr.

    Proud HydroStream Powertour Member

    2017 RXP-X 300
    2016 Quartershot T3R
    28 Skater
    2004 HydroStream Venom - 3.4 Etec - August, 2011 S&F Boat of the Month

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