Procharger and a digital Autometer Boost Gauge.

Discussion in '2005+ Mustang GT 4.6L Tech' started by nickburns31, Jun 15, 2020.

  1. nickburns31

    nickburns31 Junior Member

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    Hey folks ! I just picked up the gauges to install and monitor the A/F, Fuel Pressure and Boost. The boost comes with a sensor with an 1/8 NPT male thread. I know it needs to be installed after the procharger and I was thinking right into the throttle body intake. Before the Hose connection seems to be a good spot? I do have the Ford Performance intake on the 4.6 as well. Any thoughts or is anyone running a similar setup? I know the vacuum gauges you can just T off the Manifold vacuum


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  2. 07 Boss

    07 Boss Senior Member

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    Don't put it near the TB. Why would you hook this up different than any other pressure gauge? Just find a good vacuum source. I run mine off the line that goes to the FRPS.
     
  3. 07 Boss

    07 Boss Senior Member

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    Oh I see now. You can either tap the manifold somewhere or I suppose you can run a vacuum line to it.
     
  4. nickburns31

    nickburns31 Junior Member

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    This gauge uses the same sending unit as a fuel pressure gauge. Hence it threads into the intake or ? That’s why I was seeking advice ..

    [​IMG]


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  5. Laga

    Laga Member

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    CAUTION: Never cut into the vacuum lines leading to the fuel rail pressure sensor and bypass actuator, on the driver's side of the manifold, for the purpose of tapping in a boost gauge. Interruption of the vacuum signal to the fuel rail pressure sensor can affect the fuel pressure reading to the PCM, which can result in engine failure! Furthermore, this port reads pressure before the intercooler, and therefore is before the inherent intercooler pressure drop. Readings from this port will always be approx. 20% higher then what the engine actually sees.

    I have an Edelbrock E-Force. I tapped into the vacuum line for the FRPS for about a year. Then, I found the above warning buried on their site. Once I relocated the boost gage, I saw the boost go from 8# to 6# on the Areoforce Interceptor analog input boost gauge. I was then able to install a smaller pulley and actually get 8# of boost. I have no idea if it will be the same for your application, but if it can interfere with the signal going to the PCM, I would not do it.
     
  6. 07 Boss

    07 Boss Senior Member

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    How is hooking up a T and installing a sensor going to mess with the vacuum signal? So hooking it into my brake booster vacuum line will make my brakes fail?

    I'm curious as to how switching vacuum sources for your gauge changes your manifold pressure. That tells me you have a leak or restriction somewhere. Manifold pressure should be the same from any source. Maybe near the TB you may get some pressure waves from sudden opening or closing of the throttle blades but the pressure or vacuum should be the same wherever you tap it.
     
    Doug Huggard likes this.
  7. 07 Boss

    07 Boss Senior Member

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    Yes you are going to have to find a suitable place to drill and tap your manifold. Not sure how well that would work with our composite manifolds.
     
  8. RED09GT

    RED09GT Senior Member S197 Team Member

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    I've had my turbo boost controller getting its signal there for years and never had an issue. Tuner never had an issue with tuning it either.
    Since he has a ProCharger it will not be before the intercooler as well.
     
    boostedtrauma and nickburns31 like this.
  9. nickburns31

    nickburns31 Junior Member

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    I think I would rather drill the pipe going into the throttle body vs the performance manifold ?


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  10. RED09GT

    RED09GT Senior Member S197 Team Member

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    Another way to do it is to put the sensor in a weatherhead fitting and run a vacuum line to it. You can get a female to female 1/8" NPT fitting and then a 1/8" male NPT to a 1/8" hose barb for the other side and then run to your favorite vaccum source.
    I did that with an electric saleen boost gauge and it worked and I didn't have to tap my manifold. I did need to ground the body of the sensor to get it to work so if I had tapped my manifold, it would not have worked until I had run a ground source anyways.
     
  11. RED09GT

    RED09GT Senior Member S197 Team Member

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    Don't drill the manifold. I was quoting that post as I am tapping the vacuum source from the FPS and I have not seen any of the ill effects that Laga warned about.
    Chances are the signal needs a ground and won't read anything as the composite can't ground the signal.
     
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  12. nickburns31

    nickburns31 Junior Member

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    You are absolutely right - I didn’t even think about the ground ....


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  13. Laga

    Laga Member

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    When boost is measured before and after an intercooler, there will always be a difference because of the temperature drop and restriction of flow. The amount of difference depends on the design of the intercooler. Mine was around 2# at max boost.
    Someone at Edelbrock or Ford has determined that if you mess with the vacuum at the FPRS, it can interrupt the signal to the PCM. It doesn’t say it will, it says it can. Cheap connectors and diaphragms in sending units can fail.
     
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  14. nickburns31

    nickburns31 Junior Member

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    I ended up throwing a nipple on the sensor and have it installed coming out of the rear manifold vacuum port... Seems to be reading right ...


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  15. Doug Huggard

    Doug Huggard Junior Member

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    This would work as well if you want to tee into an existing vac line:
    https://www.summitracing.com/parts/ear-at991701erl

    https://www.summitracing.com/parts/sum-221003

    Barbs on 2 ends of the tee and your sender in the 3rd port on the tee
     
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