Synchronising Quad Throttle Bodies
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  1. #1
    1000+ Posts pgti6's Avatar
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    Default Synchronising Quad Throttle Bodies

    I had to dismantle my throttle bodies to do some work on the manifold and now that I'm re-assembling it I want to get the 2 bodies as close to being synchronised as possible.

    Last time they were done properly with a vacuum gauge fitted over each ram tube/trumpet with the engine idling & adjusted for evenness across each pair of bodies. The engine isn't ready to run so that method can't be used yet.

    With a lead light shone up through each branch of the manifold, you can see a small difference in light visible with the butterflies in the closed (idle) position. Difficult to see on the pic and it's only slight, but there is a difference.

    Question is, even though I'll use the vacuum gauge method again prior to the full engine tune should I bother with the light method to get them closer adjusted, or just leave it as is for the cams run-in period?

    Thanks

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  2. #2
    Fellow Frogger!
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    Buy four drill blanks, say 3mm diameter and put under each butterfly. This will let you adjust the linkages to ensure they sit flat on a none known surface.
    Adrian Wuillemin

  3. #3
    1000+ Posts pgti6's Avatar
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    Good tip! Thanks Adrian. Job done
    405 Mi16 2.2 litre race car for sale.
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    Lap times- Sandown 1 27.9
    Phillip Island 1 53.8

    Previous Frenchies-
    1988 205 Gti
    1998 306 GTi6
    1997 306 N5 sedan
    1996 306 N3 XT hatch
    1976 Renault R16TS manual in Avocado
    1976 Renault R16TS manual in Trak Yellow
    1975 Renault 5 Guernsey, Channel Islands
    1972 Renault 4 Guernsey, Channel Islands

  4. #4
    1000+ Posts Dave's Avatar
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    On the motorbike I use a bit of fishing line or similar like a feeler gauge.

    Dave


  5. #5
    Fellow Frogger! Roland's Avatar
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    Rig up a vacuum cleaner to suck air through the body. The you can use the vacuum gauge method with great accuracy.

  6. #6
    1000+ Posts alan moore's Avatar
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    Quote Originally Posted by Dave View Post
    On the motorbike I use a bit of fishing line or similar like a feeler gauge.

    Dave
    Similar to this I use a piece of fine fuse wire. Then when the engine is running I listen to the suck through a 500mm piece of garden hose to make sure. I am sure the various vacuum type guages work fine. My method came about from my sidedraft Weber days. Cheap and effective, at least for me.
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  7. #7
    1000+ Posts pgti6's Avatar
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    All good suggestions. Thanks guys.

    The one my tuner used was something like a trumpeters mute which fitted into/over the ram tube. He said he'd had it since his early Holden tuning days circa 179, X2, 186/S, 202. Can't remember how the vacuum gauge was fitted 'tho. (i'm usually a bag of nerves on dyno day)! I Googled 'vacuum gauges' & variations but couldn't find anything like it.

    I used Adrain's method with good success & as Dave said you can 'feel' & adjust for evenness between butterfly & body.
    405 Mi16 2.2 litre race car for sale.
    http://www.aussiefrogs.com/forum/car...-car-sale.html
    https://www.my105.com/ListingDetails...d/518/id/22164


    Lap times- Sandown 1 27.9
    Phillip Island 1 53.8

    Previous Frenchies-
    1988 205 Gti
    1998 306 GTi6
    1997 306 N5 sedan
    1996 306 N3 XT hatch
    1976 Renault R16TS manual in Avocado
    1976 Renault R16TS manual in Trak Yellow
    1975 Renault 5 Guernsey, Channel Islands
    1972 Renault 4 Guernsey, Channel Islands

  8. #8
    bob
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    G'day,

    way back when in olden times we also had vacuum gauges to check idle balance on carby setups, however, as it was done with the butterflys closed more or less other leakage factors came into the arguement to a great extent and made the system pointless.

    We found it better to ensure that the little fellas were fully open together and to hell with where they sat at idle. Best way is with a couple of ordinary drill shanks, same size of course, as mentioned above. Pick a drill size that opens the butterflys about a quarter to a third, hold the butterflys with the fingers and tighten the clamps - always assumes that each butterfly has been correctly seated in the shaft first !

    cheers,
    Bob

    BTW, reckon that there's one of those gadgets in the shed somewhere, if I can find it I'll post a picture or two.

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