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TVSV - Disable or not to disable?

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nightram
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2012/03/09 13:08:34 (permalink)
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TVSV - Disable or not to disable?

Two's r us recommends to disable the TVSV when installing a manual boost controller. 
 
Do you need to disable it on a electronic boost controller and why?
 
Link - Manual Boost Controller Installation - Twos R Us
 
 

1989 MR2 GT (SW20) 325hp, sold to buy a Jeep

I guess "you wouldn't understand"
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    MRTurbo
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    Re:TVSV - Disable or not to disable? 2012/03/09 13:15:35 (permalink)
    +1 (1)
    Because all the TVSV is a 'factory boost controller' ie. bleed valve.

    1990 SW20 GT 3S-GTE Targa
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    #2
    nightram
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    Re:TVSV - Disable or not to disable? 2012/03/09 13:24:44 (permalink)
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    So was that a yes or no? I ask as I have a AEM electronic boost controller. TVSV is unmodified and I can easily boost 13-20PSI.

    1989 MR2 GT (SW20) 325hp, sold to buy a Jeep

    I guess "you wouldn't understand"
    #3
    EssDub
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    Re:TVSV - Disable or not to disable? 2012/03/09 13:29:05 (permalink)
    +1 (1)
    MRTurbo

    Because all the TVSV is a 'factory boost controller' ie. bleed valve.

    Not quite, my friend!
     
    Yes, the valve acts as a staged bleed valve, but it also operates two other things:
    1) The factory boost gauge gets its signal from this sensor
    2) It is responsible for activating the 12psi boost cut that is part of the standard ECU system. :)
     
    By disconnecting it, you remove the boost cut as well as disabling the (useless) stock turbo gauge on the cluster.  It is a common mod for people to do in order to up the boost to higher levels.
    #4
    nightram
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    Re:TVSV - Disable or not to disable? 2012/03/09 13:49:38 (permalink)
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    Good info, + rep to both.
     
    So the way I reading it is there is no benefit for me to disable the TVSV if I have a electronic boost controller (also have ATS boost cut removed form ECU)

    1989 MR2 GT (SW20) 325hp, sold to buy a Jeep

    I guess "you wouldn't understand"
    #5
    EssDub
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    Re:TVSV - Disable or not to disable? 2012/03/09 13:59:17 (permalink)
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    nightram

    Good info, + rep to both.

    So the way I reading it is there is no benefit for me to disable the TVSV if I have a electronic boost controller (also have ATS boost cut removed form ECU)

    Correct.
     
    If you already have a boost cut defender installed, then disabling the T-VSV poses no gain whatsoever.  
    #6
    TIPSIDUECE
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    Re:TVSV - Disable or not to disable? 2012/03/09 14:28:20 (permalink)
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    EssDub

    MRTurbo

    Because all the TVSV is a 'factory boost controller' ie. bleed valve.

    Not quite, my friend!

    Yes, the valve acts as a staged bleed valve, but it also operates two other things:
    1) The factory boost gauge gets its signal from this sensor
    2) It is responsible for activating the 12psi boost cut that is part of the standard ECU system. :)

    By disconnecting it, you remove the boost cut as well as disabling the (useless) stock turbo gauge on the cluster.  It is a common mod for people to do in order to up the boost to higher levels.

    mrturbo is correct its a factory boost controller. it allows you to boost a lil bit more if the conditions are right for the ecu, if not then it doesnt bleed and locks you with the factory boost pressure.
    the map sensor by the firewall behind the intake manifold near the diagnostic ports is the one responsible for the cluster boost gauge aswell as the factory fuel cut.
     
    the tvsv is located underneath the intake manifold where it runs a vacuum hose to the wastegate actuator where its the easiest way to disable by cutting and plugging the vacuum line without getting rid of the whole system(can be easily put back together if u want the system back in stock form)
     
    disable it if you want to run precise boost pressure, dont leave it and let it mess with ur e boost controller. are u still on stock ecu? retained afm?
    its a simple cut and plug up d line step where u get to have peace of mind knowing ur e boost has full controll of ur boost pressure especially if ur already running high boost.
     
     

    Why do people say "grow some balls"? Balls are weak and sensitive if you really wanna get tough, grow a vagina! Those things take a pounding!
    #7
    MRTurbo
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    Re:TVSV - Disable or not to disable? 2012/03/09 14:36:03 (permalink)
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    ^what he said.
    So to answer your question, yes I'd disable it as it'll interfere with your EBC, since your EBC wont be able to override the stock ECU programming. Most of the EBC manufacturers recommend you do so too.

    1990 SW20 GT 3S-GTE Targa
    2001 Honda CBR600F4i

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    blacky83
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    Re:TVSV - Disable or not to disable? 2012/03/09 15:40:07 (permalink)
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    To confirm, the factory boost gauge and fuel cut are run from the MAP sensor that feeds from the intake manifold. Its fairly easy to see from the top, and is completely separate from the TVSV.
     
    Yes, you should definitely disconnect the TVSV if you're running a boost controller of any sort. In stock form it will allow the ECU to switch between 7 and 10psi. However if you set a boost controller to open at 14psi, and the TVSV is still open it will continue to bleed out wastegate pressure and might actually spike to 17psi or beyond.
     
    You want to stop the ECU having any effect on the wastegate, and control it completely using your boost controller.
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    just_ace
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    Re:TVSV - Disable or not to disable? 2012/03/09 15:46:31 (permalink)
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    What MRTurbo said originally. Tvsv is jyst factory boost control.

    I as many others have disabled when installing boost control regardless of elce/man. Boist cut etc is still retained unless you disconnect the vac hose to the map sensor or fit an fcd.
    #10
    nightram
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    Re:TVSV - Disable or not to disable? 2012/03/10 19:40:59 (permalink)
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    From a email from ATS Racing
     
    Scott @ ATS Racing
    Yes disable the T-VSV, but leave TVIS alone unless you have an ATS Spacer.



    1989 MR2 GT (SW20) 325hp, sold to buy a Jeep

    I guess "you wouldn't understand"
    #11
    just_ace
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    Re:TVSV - Disable or not to disable? 2012/03/10 20:17:29 (permalink)
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    leave tvis alone unless your only chasing top end power and have a built eng with cams etc
    #12
    artymr2
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    Re:TVSV - Disable or not to disable? 2012/03/10 20:54:54 (permalink)
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    just_ace

    leave tvis alone unless your only chasing top end power and have a built eng with cams etc

     
    Yep, unless your TVIS is playing up and not opening as it should (mine did this).  Easy to check,  remove and plug the hose leading to the actuator and see if you can feel more top end power.  On mine the difference was substantial.
     
    Cheers

    Black SW20 GT Turbo T-top


    #13
    bigh
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    Re:TVSV - Disable or not to disable? 2012/03/12 20:20:54 (permalink)
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    Simple answer:  
    I installed an AEM boost controller, and found you have to disable the TVSV for the boost controller to work right.
     
    Get a little more of that hosing you used to run to the boost solenoid, terminate one end with something (i used a bolt), put on some hose clamps on that end and the end off the actuator, and away you go. 
     
    you WANT the boost controller to do the work for you, not the TVSV system :)
     
    EDIT: I set my A boost level to be 9.99psi and the B boost level to be 14.5-9psi (around one bar) not sure if you'd want to go much higher than that without running different plugs, and making sure your engine was in good condition.
    #14
    nightram
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    Re:TVSV - Disable or not to disable? 2012/04/29 19:35:27 (permalink)
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    What number (1,2,3,4,5) is the TVSV connection I need to disable?
     

     
    All rights to the original dude who took this photo.

    1989 MR2 GT (SW20) 325hp, sold to buy a Jeep

    I guess "you wouldn't understand"
    #15
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