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Thread: Data logging crankcase pressure

  1. #1
    Sick 660r's Avatar
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    Default Data logging crankcase pressure

    does anyone have experience or knowledge of doing this? I believe I blew an intake manifold gasket. I developed a miss after hitting boost for the first time. Plug 7 has a little oil residue and I also have a rear main seal leak. Recording crankcase pressure would have told me right away. I only have an O2 sensor in the passenger bank so it didn't pick up on the rich condition.

    My plan is to wire an external map sensor and have it connected to a vac line coming from the valve cover. I don't know if I've mentioned it here or in another thread but from what I've researched, spikes in crankcase pressure indicate detonation before it becomes audible or before a knock sensor can detect it. I don't have intentions of pushing my tune that far but I was thinking that I could record the mapdot (of the crankcase) and basically create my own "knock sensor". I could set MS to pull timing once it detects a threshold mapdot that I have determined from data logging. It would be a nice safety factor and there is no possibility of false readings from things like solid lifters etc unless something fails like a gasket.... It will also keep me up to date on ring conditions.


    Quote Originally Posted by BluRT00 View Post
    Part your red sport out and buy a gen 2. Problem solved.

  2. #2
    Osee's Avatar
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    Good idea, why would one bank have a rich condition though? Each injector is a mirror of the others correct?


    Mods - TB Spacer, Short Throw Dipstick, Performance Auto Zone Intake "0.30 over bore", R/T Cam, Performance Chip, Radiator Delete

    Rev limiter? that's what valve springs are for!

  3. #3
    Sick 660r's Avatar
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    In theory the should be the same but it's not s perfect world. Cylinder 7 plug was not firing correctly with the blown intake gasket.


    Quote Originally Posted by BluRT00 View Post
    Part your red sport out and buy a gen 2. Problem solved.

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    Duner's Avatar
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    What do you have for a breather setup?
    Duner
    4.7 Turbocharged CC in white - 12's
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    1999 Dodge Dakota R/T RC Turbo: 10.51 @ 130.13 MPH

  5. #5
    Sick 660r's Avatar
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    2 -12 lines to a puke tank.

    It's a fresh motor straight off the engine dyno.


    Quote Originally Posted by BluRT00 View Post
    Part your red sport out and buy a gen 2. Problem solved.

  6. #6
    Sick 660r's Avatar
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    Plug 5


    Plug 8


    And 7


    Quote Originally Posted by BluRT00 View Post
    Part your red sport out and buy a gen 2. Problem solved.

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    Sick 660r's Avatar
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    I'm being lazy and using data I found online for a 2 bar gm map sensor. 4.9v = 29.01psi and 0.02V = 0.40psi. This needs to be converted to a 0-5v scale and tunerstudio only goes to the first decimal place. With that being said, 0v = 0.3 psi and 5v = 29.6 psi. I don't really care if this isn't extremely accurate I just want to record large changes is crankcase pressure.


    Quote Originally Posted by BluRT00 View Post
    Part your red sport out and buy a gen 2. Problem solved.

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    Well I have to admit that I am impressed with how smoothly this went. All I did was splice into the map sensor output and send that to pin 23 on the MS3X expansion. I decided to test the values against the map sensor that comes on the MS box. I did this by sending the gm map sensor and MS map sensor hose to a T fitting. I then used the other port to produce a vacuum/pressure. I data logged the values and compared. The values I found on line seem to be correct. Here is a screen shot showing the gm signal (white) and the MS signal (red). Now I just need to finalize the wiring and plumbing then take it for a drive.



    Quote Originally Posted by BluRT00 View Post
    Part your red sport out and buy a gen 2. Problem solved.

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