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Thread: Block off BOV

  1. #1
    kaloo's Avatar
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    Arrow Block off BOV

    I Blocked off BOV and it show me 14 psi is that good ???

    AIR SUCTION BLOCK OFF KIT

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  2. #2

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    You might want to invest in one of the fuel controllers sometime soon. Or at least get a wideband O2 and EGT to see how it's running.

    It will all depend on if the ECU is capable of determining the amount of fuel needed with that extra ability to breath and the 14psi

  3. #3
    Check it with an aftermarket boost gauge. From what I read, the stock supercharger & pulley is not capable of it.

  4. #4

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    Quote Originally Posted by creativepuzzle View Post
    Check it with an aftermarket boost gauge. From what I read, the stock supercharger & pulley is not capable of it.
    That's another good point, didn't cross my mind earlier. Might want to check that out too Kaloo. You might be fine with the block off.

    What if any damage could it cause to block off the blow off valve? Will the relief Valve be sufficient?

  5. #5
    The valve he is blocking is design to relief pressure above 12.18 psi while the other valve is design to activate under vacuum (when you let off the throttle). The vacuum opens up the valve to release the pressurized air back into the intake instead of jamming on the throttle body. If the relief valve is working properly and supercharger is setup correct, there will be no benefit in blocking it as no air should leak as Ultra is suppose to run at 11.4 psi.

    The two valves serve two difference purpose.


    What if any damage could it cause to block off the blow off valve? Will the relief Valve be sufficient?[/quote]

  6. #6
    TurboJimmy's Avatar
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    Quote Originally Posted by Arcolog2 View Post
    You might want to invest in one of the fuel controllers sometime soon. Or at least get a wideband O2 and EGT to see how it's running.

    It will all depend on if the ECU is capable of determining the amount of fuel needed with that extra ability to breath and the 14psi
    Maybe if the ski is set up to run 90 octane at 11.x psi, then just maybe we could squeak by with a few more psi with 93 without an ecu or piggyback

  7. #7

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    Well increased octane would help prevent detonation, but it won't change air/fuel ratio.

  8. #8
    kaloo's Avatar
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    Quote Originally Posted by TurboJimmy View Post
    Maybe if the ski is set up to run 90 octane at 11.x psi, then just maybe we could squeak by with a few more psi with 93 without an ecu or piggyback
    i run 98 octane

  9. #9
    That is 98 Research Octane Number (RON) which is equivalent to in the US 93 pump octane number (PON) or sometimes refer to as (R+M)/2.

    Quote Originally Posted by kaloo View Post
    i run 98 octane

  10. #10
    kaloo's Avatar
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    Quote Originally Posted by creativepuzzle View Post
    That is 98 Research Octane Number (RON) which is equivalent to in the US 93 pump octane number (PON) or sometimes refer to as (R+M)/2.
    this is the info for 98
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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