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Thread: Digital $30 trans PSI sending unit, works great!

  1. #1
    Lifetime Member Mr. P.'s Avatar
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    Default Digital $30 trans PSI sending unit, works great!

    This is not a how-to but more of an FYI -

    I found a cheap accurate pressure sending unit on eBay for $30 shipped (pigtail included!), I verified its output with several known sources (air compressor & gauge, and mechanical trans pressure gauge) and it works a treat. The seller is "renbusan" and the eBay store is named "Industrial-stuffs". The sending unit I used is labeled "500-psi", is accurate to +-2%, runs on a +5-volt source, and has a third wire which is the sensor voltage output which can easily be monitored as a Flashscan analog input, the formula for the custom PID = "iff({EXT.AD3} > 0.4, ({EXT.AD3} - 0.4) / 0.0077, 0)".

    Mr. P.

    PS - the same seller has a 100-psi sending unit that would also work well for monitoring fuel pressure, for $30-shipped - this is by far the cheapest option I have seen for a fuel pressure sending unit, although I don't know what the PID for it would be (you would have to determine that with testing). The next cheapest fuel pressure sending unit that I know of is the $65 one sold by Aeroforce.
    2003 Silverado SS, with Novi-1500 "CAI mod"
    EFILive V 7.5 COS-3 (OLSD, for now!)

  2. #2
    Senior Member Chuck L.'s Avatar
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    Here's the link..
    http://cgi.ebay.com/ebaymotors/Press...Q5fAccessories

    Sure beats the $135 from Summit!
    Chuck L.
    CODY Motorsports
    Fuel Injector Service
    Madison, GA.
    706-342-3152
    770-265-5144 [C]

  3. #3
    Lifetime Member Mr. P.'s Avatar
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    For all we know they might even use the same ASIC inside!
    2003 Silverado SS, with Novi-1500 "CAI mod"
    EFILive V 7.5 COS-3 (OLSD, for now!)

  4. #4
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    Hmmm thats really tempting, and Id probably get the 500psi for trans and a 100psi for fuel. Not running boost yet, but for $30 its cheap insurance that your pump is putting out the correct pressure. And be able to see what you're actually getting vs commanded trans line pressure...
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, starting the mods
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

  5. #5
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    anyone try the 100psi? i think I'm going to buy one. says linear output. would this work for turbo backpressure also?
    9.8@150 . LQ4 Turbonetics Billet 7575@18psi, 6 speed, non-intercooled with meth. Speed Density, open loop, no PE.

  6. #6
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    Probably not, the exhaust side is pretty hot.
    E85 is NOT flex fuel.

    2003 Chevy S10 4.3L LU3 LS1B Auto
    48 LB injectors
    Race Proven Motors 2114 intake
    T70 turbo.

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    much less expensive than summit...

  8. #8
    Senior Member Chuck L.'s Avatar
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    You could use the sensor with a length of copper tube as a heat sink. I did that w/ a common gauge and had no problems..3' of copper tube.
    Chuck L.
    CODY Motorsports
    Fuel Injector Service
    Madison, GA.
    706-342-3152
    770-265-5144 [C]

  9. #9
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    Quote Originally Posted by Chuck L. View Post
    Here's the link..
    http://cgi.ebay.com/ebaymotors/Press...Q5fAccessories

    Sure beats the $135 from Summit!
    why cant i find that kind of price these days. sigh.

  10. #10
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    i ordered that ebay one yesterday
    9.8@150 . LQ4 Turbonetics Billet 7575@18psi, 6 speed, non-intercooled with meth. Speed Density, open loop, no PE.

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