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Thread: Checking Drive Pressure on a Holset Powered TIII

  1. #21
    turbo addict
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    Re: Checking Drive Pressure on a Holset Powered TIII

    The interesting thing is the OEM's use WB sensors very close to turbos and catalytic converters, so why would the same sensor be limited in an aftermarket application? Using that reasoning I understand why people look at those instructions and go"....pshh...whatever" and just put them in the stock location.

  2. #22
    Buy my stuff!!!!!!!!!!! :O) Turbo Mopar Vendor turbovanmanČ's Avatar
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    Re: Checking Drive Pressure on a Holset Powered TIII

    Quote Originally Posted by Reaper1 View Post
    The interesting thing is the OEM's use WB sensors very close to turbos and catalytic converters, so why would the same sensor be limited in an aftermarket application? Using that reasoning I understand why people look at those instructions and go"....pshh...whatever" and just put them in the stock location.
    Because OE sensors are built to a different standard knowing they have to last at least 60-100,000 miles. The WB sensors we use are cheap and old technology. Price out a newer OE wideband,

    Most of us on a diesel forum I am on check drive pressures, my van is currently 1.5:1 around town and 2:1 towing and at WOT. Going to drop my exhaust and see how much that changes it, if a lot, then its going 4".
    1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
    1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
    2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
    2004 GSW TDI, 5 speed, fully loaded, modified.

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  3. #23
    boostaholic
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    Re: Checking Drive Pressure on a Holset Powered TIII

    Back to my original question,
    Does anyone have a picture of their fitting installed into the stock exhaust manifold so I can see where to drill and tap mine?

  4. #24
    boostaholic
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    Re: Checking Drive Pressure on a Holset Powered TIII

    I'm thinking of installing it in the boss, on cylinder 2, is this a good location?

  5. #25
    Buy my stuff!!!!!!!!!!! :O) Turbo Mopar Vendor turbovanmanČ's Avatar
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    Re: Checking Drive Pressure on a Holset Powered TIII

    YOu want it as close to the 4 bolt flange as possible.
    1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
    1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
    2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
    2004 GSW TDI, 5 speed, fully loaded, modified.

    Aurora ignition wires for sale. Link to info

    Super60 roller cams or custom/billet cams. Link to info

  6. #26
    Supporting Member Turbo Mopar Contributor rx2mazda's Avatar
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    Re: Checking Drive Pressure on a Holset Powered TIII

    Put it in that "Y" right before the flange.
    Carroll

    SILVER, 85 GLH-R/T, TIII powered, Fueltech, ID1300's. PTE5857
    RED, 91 Spirit R/T - Holset HE351 - 12.6 @ 107...R.I.P.



  7. #27
    turbo addict
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    Re: Checking Drive Pressure on a Holset Powered TIII

    Drive pressure doesnt rise any faster than boost pressure, no reason to be concerned with "signal delay". Its not a spike you are looking at, its a very slow signal with a time constant of seconds.

    Your pressure gauge is not going to show cylinder pulsations regardless of where you put the pressure sensor. I used an instrumentation grade sensor with a khz bandwidth sampled digitally and saw no pulsations. Even if you could observe pulsations, they overall signal will be dominated by the average pressure in the manifold. It wont make your measurement any less useful.

    Why the desire to measure pressure pre-turbo, instead of pre-exhaust manifold? Isnt the idea here to get an overall picture of how much pressure the exhaust valve is seeing, and therefore the closer to the head the better?

    http://www.turbododge.com/forums/f4/...ml#post3571297




  8. #28
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    Re: Checking Drive Pressure on a Holset Powered TIII

    Quote Originally Posted by acannell View Post
    Why the desire to measure pressure pre-turbo, instead of pre-exhaust manifold? Isnt the idea here to get an overall picture of how much pressure the exhaust valve is seeing, and therefore the closer to the head the better?

    I am assuming he wants to check drive pressure in the manifold, hence why he posted a pic of the exhaust manifold. Its not so much the pressure the exhaust valve is seeing but how good the turbo drive pressure is, as the higher it is, the less efficient the engine is.
    1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
    1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
    2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
    2004 GSW TDI, 5 speed, fully loaded, modified.

    Aurora ignition wires for sale. Link to info

    Super60 roller cams or custom/billet cams. Link to info

  9. #29
    Moderator Turbo Mopar Staff Vigo's Avatar
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    Re: Checking Drive Pressure on a Holset Powered TIII

    The only reason 'drive pressure' matters is because of its effect on pumping losses and exhaust valve sealing. I think Acannell is correct although i dont think the location matters much within the few inches worth of options that we realistically have.

    Dont push the red button.You hear me?

  10. #30
    boostaholic
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    Re: Checking Drive Pressure on a Holset Powered TIII

    The reason I don't want to put it in the y is the material is pretty thin right there. The boss is flat and has some thickness. I will look at putting it in the turbo scroll, that's probably the best spot and the thickest point. I'll look tonight.

  11. #31
    boostaholic
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    Re: Checking Drive Pressure on a Holset Powered TIII

    Here's where I put it.

  12. #32
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    Re: Checking Drive Pressure on a Holset Powered TIII

    That will work.
    1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
    1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
    2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
    2004 GSW TDI, 5 speed, fully loaded, modified.

    Aurora ignition wires for sale. Link to info

    Super60 roller cams or custom/billet cams. Link to info

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