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Throttle body sync?

Discussion in 'Small Block' started by Keith Hoffman, May 16, 2018.

  1. Keith Hoffman

    Keith Hoffman Just got it firing! GT Contributor

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    Have received a 2004 Breva 750ie that I think would profit from a synchronization of the throttle bodies. Is this something a 50% handy person could do? The closest dealer is 100 miles away. I thought I had a local shop who could do work like this but they say no...
    Keith Hoffman
    Goshen, IN
     
  2. john zibell

    john zibell Moderator Staff Member GT di Razza Pura

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  3. backonabike

    backonabike Just got it firing! GT Contributor

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    I just want to confirm if we dont touch this screw:
    Screen Shot 2019-11-13 at 11.51.20 PM.png

    and adjust bypass (if needed):
    Screen Shot 2019-11-13 at 11.51.33 PM.png

    or adjust the linkage:
    Screen Shot 2019-11-13 at 11.51.49 PM.png

    we should be ok without resetting Throttle Position Sensor (TPS) correct?
     
  4. Kevin.NZ

    Kevin.NZ Cruisin' Guzzisti

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    Correct -do not touch the "throttle stop screw" or you will be screwed. The bypass are only for tick over with throttle closed, the linkage is to set balance at about 3000 rpm. If you adjust that you need to do a TPS reset and use relevant software as John says. That's what I do on my Breva 1100
     
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  5. backonabike

    backonabike Just got it firing! GT Contributor

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    I have a 2012 v7 racer but just trying to learn, and I read in threads to follow the instructions from brava1100 manual.

    so basically MGs are setup to read mixture from the LH cylinder, and the RH cylinder must match to this "master". Would this be correct understanding? Also if at idle the TB are not balance can I use the stop screw on the RH cylinder to match?

    TIA
     
  6. Kevin.NZ

    Kevin.NZ Cruisin' Guzzisti

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    They do not read the mixture from the left cylinder, that is done by an Oxygen sensor sometimes called a Lambda Sonda and that is down by the cat after the 2 exhausts have joined, the screw you adjust to balance (not bypass screws) makes sure the two throttle bodies are perfectly matched and when the throttle is opened they track at the same angle. On my Breva the TPS is on the RH throttle body. From memory when the throttle is shut the TPS should read 4.6 degrees, that's why you need the software. I strongly advise against turning the throttle stop screw. I use a manometer to balance the throttle bodies at tick over and 3000rpm .
     
  7. scottmastrocinque

    scottmastrocinque Scott Mastrocinque GT Famiglia

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