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Thread: Td5 Boost Gauge

  1. #1
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    Td5 Boost Gauge

    Where is the best place to tap into to get a reliable reading?

  2. #2
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    I've been advised that the best place would be at the inlet manifold but in the interim i put a tee in the waste gate hose before the modulator BUT in doing so was fully aware that the pressure that the guage would see would be less (at the least 2psi lower i was advised) than if measured at the intercooler.

    I will put it right one day

    http://www.aulro.com/afvb/discovery-...ml#post1635469
    onebob
    LROCV member #131
    1999 build D2 TD5 Auto, Mantec snorkel, 2" LRA spring lift, ARB on board air, Ashcroft ATB, CMM air ram CDL shifter, swag & gold pans ....

  3. #3
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    I connected mine at the same place as onebob, and when compared to the Nanocom reading I could not detect any noticeable difference.

  4. #4
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    X3 , I have taken mine from the same spot , handy for measuring the pressure drop across the intercooler when used with nanocom .
    Varies between 0 and 1.5 psi dependant on ambient temp and atmospheric pressure on mine

  5. #5
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    ImageUploadedByTapatalk1430827239.703973.jpg
    I had my egr removal kit tapped to suit a threaded barb, to plumb boost gauge into.

  6. #6
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    Depends what you wish to measure. I mean if your fitting one then you've probably already decided what you want to measure right?
    i.e. if you want to know the boost pressure going into the engine then as close to the inlet valves as possible - taping the inlet manifold or throttle body (for lack of a better description) component are probably the easiest.
    if you want to know the pressure drop from the intercooler then a connection each side as close to the intercoolers inlet and outlet.
    if you want to know the pressure out of the turbo the as close to the air outlet on the turbo.
    Location is relative to what you want to know from the measurements.

  7. #7
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    Quote Originally Posted by twr7cx View Post
    Depends what you wish to measure. I mean if your fitting one then you've probably already decided what you want to measure right?
    i.e. if you want to know the boost pressure going into the engine then as close to the inlet valves as possible - taping the inlet manifold or throttle body (for lack of a better description) component are probably the easiest.
    if you want to know the pressure drop from the intercooler then a connection each side as close to the intercoolers inlet and outlet.
    if you want to know the pressure out of the turbo the as close to the air outlet on the turbo.
    Location is relative to what you want to know from the measurements.
    This makes a lot of sense. Could it be argued most people want to ensure the engine is not being over boosted therefore the intake would be the best spot in this scenario?

    I'm assuming the intercooler and the turbo can handle more boost than the engine is asking for. Therefore it is not so critical to measure the others unless fault finding?

  8. #8
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    Quote Originally Posted by Jazzman View Post
    This makes a lot of sense. Could it be argued most people want to ensure the engine is not being over boosted therefore the intake would be the best spot in this scenario?
    Honestly I think a boost gauge is probably a more **** factor in our case. Yes you need one when you set the wastegate, but once set properly it should be fine and I don't see the reason to keep viewing the boost pressure - in saying that I do have one fitted.
    My VNT over boosted once (30psi), it wasn't the boost gauge that first altered me to this, it was the high pitched turbo noise. The cause was the silicone line to the actuator has chafed through.
    On a standard TD5 setup the vehicle will let you know when your overboosting as it will cut out into a safe mode. This will likely occur prior to you reading the pressure on your boost gauge.

    But yes, if you want to know what pressure is actually getting into the engine, as close to the intake valves as possible is best which for the sake of practicality is the inlet manifold or inlet throttle body shaped piece.

    Quote Originally Posted by Jazzman View Post
    I'm assuming the intercooler and the turbo can handle more boost than the engine is asking for.
    The whole point of boost is to give the engine more than it's asking for.

    Quote Originally Posted by Jazzman View Post
    I'm assuming the intercooler and the turbo can handle more boost than the engine is asking for. Therefore it is not so critical to measure the others unless fault finding?
    Yes, the other measurements can help in fault finding such as a blocked pipe or intercooler or finding inefficiencies in the inlet system. I used to have a centrifugal supercharger on a Falcon and we measured various parts of the intake to reduce the pressure drops.

    I'm not sure what the capability of the standard turbo charger is but I would assume 22psi would be near it's limit - at this pressure level you'd be better off with an upgraded bigger intercooler too. The standard turbo and intercooler were matched to the standard TD5 motor.

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