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Thread: 500efi Upgrades

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  1. #1
    Charter Member #11 IrishTornado's Avatar
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    500efi Upgrades

    Whats the best setup/application to get a 500efi to a reliable turnkey 650hp?

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    Charter Member #25
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    Re: 500efi Upgrades

    Put a sticker on it that says 650 HP and leave it alone.

  3. #3
    Charter Member #11 IrishTornado's Avatar
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    Re: 500efi Upgrades

    Quote Originally Posted by Busta View Post
    Put a sticker on it that says 650 HP and leave it alone.
    You should know me better than that Chris. I've only had one season I didn't have the motors out of my boat.

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    Charter Member #5 MRBAJA's Avatar
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    Re: 500efi Upgrades

    LMFAO CHRIS! HAHA!

    Well Irish...there are these little blue bottles that spray this special gas...that would match your big blue motors...they would get you to 650 real quick....but probably only one pull outta them LOL!

    Cams, flow the heads, port/polish intakes...ECU re-cal.....lots of fuel pressure.

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    Baja Boat Owner mefituning's Avatar
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    Re: 500efi Upgrades

    Quote Originally Posted by IrishTornado View Post
    Whats the best setup/application to get a 500efi to a reliable turnkey 650hp?
    Dave,

    CAM, Flow the heads, Dump the valves and put in some tuliped swirlies maybe even stepup to a better head, beef up the valve train, and loose (if ya gottem... stock lifters), cleanup fuel delivery, and of course tune it. They'll be real reliable. 620 is an everyday number 650 is just a bump away. More important you pickup the torque numbers.

  6. #6
    Charter Member #11 IrishTornado's Avatar
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    Re: 500efi Upgrades

    Quote Originally Posted by netsys View Post
    Dave,

    CAM, Flow the heads, Dump the valves and put in some tuliped swirlies maybe even stepup to a better head, beef up the valve train, and loose (if ya gottem... stock lifters), cleanup fuel delivery, and of course tune it. They'll be real reliable. 620 is an everyday number 650 is just a bump away. More important you pickup the torque numbers.
    Sounds like we need to talk some #'s on what you just described. I'd want to upgrade to aluminum heads keep the stock intake.

  7. #7
    Charter Member #6 Anchorman's Avatar
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    Re: 500efi Upgrades

    Quote Originally Posted by IrishTornado View Post
    Sounds like we need to talk some #'s on what you just described. I'd want to upgrade to aluminum heads keep the stock intake.
    X2
    Because without beer things just dont seem to go as well

  8. #8
    Charter Member #26
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    Re: 500efi Upgrades

    Quote Originally Posted by netsys View Post
    Dave,

    CAM, Flow the heads, Dump the valves and put in some tuliped swirlies maybe even stepup to a better head, beef up the valve train, and loose (if ya gottem... stock lifters), cleanup fuel delivery, and of course tune it. They'll be real reliable. 620 is an everyday number 650 is just a bump away. More important you pickup the torque numbers.
    Thank GOD someone is finally talking about torque. I know I know nothing but as I have told anyone that will listen TORQUE moves a boat. To add to that a DYNO only measures TORQUE. Horse Power is just a math calculation. Move the torque curve higher and you go faster.

  9. #9
    Charter Member #6 Anchorman's Avatar
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    Re: 500efi Upgrades

    Quote Originally Posted by INDY View Post
    Thank GOD someone is finally talking about torque. I know I know nothing but as I have told anyone that will listen TORQUE moves a boat. To add to that a DYNO only measures TORQUE. Horse Power is just a math calculation. Move the torque curve higher and you go faster.
    you need some low end torque to get the boat on plane as well.
    Because without beer things just dont seem to go as well

  10. #10
    Charter Member #11 IrishTornado's Avatar
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    Re: 500efi Upgrades

    Quote Originally Posted by INDY View Post
    Thank GOD someone is finally talking about torque. I know I know nothing but as I have told anyone that will listen TORQUE moves a boat. To add to that a DYNO only measures TORQUE. Horse Power is just a math calculation. Move the torque curve higher and you go faster.
    This is the same torque that is going to push that 25OL up into the 80's!!!!

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