Boost a Pump Wiring

Discussion in 'SRT Hellcat Performance' started by Badkittycat, Jun 25, 2016.

  1. Badkittycat

    Badkittycat Rookie

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    How did you successfully wire in your boost a pump. I'M currently in the low to mid 900's at the tires and the pressure is dropping on spray. I added an MSD BAP as I would to any other Hemi by installing the BAP in series in the DB/OR pump power wire. I know the Hellcat has a built in voltage booster in its control module. So I am supplying the control module with higher voltage. This works great maintaining 80psi with one major problem, at 5900 rpms the voltage to the pump drops and the fuel pressure drops way down into the thirty range. All I can say is thank god for factory widebands. The ecm jacked the fuel trims and kept the Hemi feed. So How are you wiring yours up and do you have a check engine light, because I did. I was actually able to maintain higher pressure with no Bap and get the car in the low 1000 rwhp range on spray. The car does maintain higher pressure with the bap until 5900 when it suddenly just drops pressure. I know many are running BAPs without issues so I would just like to know how you have the unit wired in. Any help would be appreciated.

    Thank You
     
  2. El Gato Diablo

    El Gato Diablo Senior Hellcat Member

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    What did you do to fix
     
  3. Racist Cat

    Racist Cat Silver Member

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    Sounds to me that this is starting to get close to torque management area...
     
  4. El Gato Diablo

    El Gato Diablo Senior Hellcat Member

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    The reason I ask is because I recently had an issue with the fuel pressure dropping to 36 and it felt like the car just shut off. I have a bap as well. Afr held at an acceptable range. I tested hobb switch for operation and output voltage when activated. Op's issues were very similar.
     
  5. Racist Cat

    Racist Cat Silver Member

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    I'm clueless about it. Just a swag at the moment.
     
  6. purpcat

    purpcat Hellcat Member

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    This is how I wired mine, getting ready for tuning... is this the correct way?
     

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  7. El Gato Diablo

    El Gato Diablo Senior Hellcat Member

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    That's the way I was told and many are running that way
     
  8. purpcat

    purpcat Hellcat Member

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    Ok cool, did you ever figure out your pressure drop issue? I don't want to run into the same issue
     
  9. El Gato Diablo

    El Gato Diablo Senior Hellcat Member

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    I spoke to Tim Barth and I seem to be the only one with the issue I'm going to recheck all my connections maybe my factory fuel pressure sensor is going bad and giving a false reading to the fuel pressure module Not sure what the issue is reaching for the stars at this point
     
  10. lexluther

    lexluther Hellcat Member

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    How does the BAP pressure switch get tapped in and where?
     
  11. El Gato Diablo

    El Gato Diablo Senior Hellcat Member

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    Top supercharger lid is the easiest. I did mine behind the boost bypass valve so it can't be seen but most install it on the side or rear of lid.
     

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