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Bosch BIP373 Coil Driver Mod Kit

5 out of 5 based on 6 customer ratings
(6 customer reviews)

$10.00

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Description

The power transistor that Bosch uses in their own ECUs is now available to you! This is a ‘mod kit’ for installing a BIP373 in a Megasquirt, or replacing an older or damaged VB921 with the much improved BIP373. This kit includes a Bosch BIP373, mica insulator, mounting hardware, and a 330 ohm resistor (used for MS1/Extra and MS2/Extra mods).

These are almost a drop-in replacement for the (long ago discontinued) VB921, except that they must be installed with a mica insulator as they have a metal backed case. Other than that, they work with exactly the same circuits as the VB921. We have a page that goes into more detail about these transistors here. These have held up very well in our tests, even when we’ve deliberately tried to break them. But like a VB921, they still provide current limiting to protect the other components of your ignition circuit.

We’ve tested these with MS1/Extra, MS2 standard code, and MS2/Extra.

Note: For the DIYPNP, use part number DP_BIP373-K.

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6 reviews for Bosch BIP373 Coil Driver Mod Kit

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Where do I install the transistor in the MegaSquirt?

  • You can mount them to an extra heat sink above or below the main heat sink, or bolt them to either the case lid or endplate.

Can I use them with an MS3X?

  • The MS3X spark outputs are hard wired directly to the DB37, and a case with an MS3X inside is already fairly crowded. We recommend using an external ignition module with the MS3X like our QuadSpark four channel module instead. You can, however, install a single BIP373 on the main board for one channel direct coil control.

Questions & Answers

    I have a ms1 v3. Do I just pull the old one out and solder this in with the insulator?
  1. 0 votes
    Q I have a ms1 v3. Do I just pull the old one out and solder this in with the insulator?
    Asked by Tp
    Answered by the admin

    That's correct, as long as the resistor you're using with the old coil driver is in the 330 ohm range.

  2. Hi I have a 1987 Jeep stroked 4.0 turbocharged and I am use 2000 Jeep 4.0 coil pack rail a dumb coil packs can that damage your No, just setup as waste spark. Being logic or dumb doesnt change the order they fire. And its your choice on the bips or quadspark. If you already tried hooking the Ms3x card up too the coils, you probably fried the ignition buffer driver on the card in the ms3x? The engine hasn’t been started with this setup
  3. 0 votes
    Q Hi I have a 1987 Jeep stroked 4.0 turbocharged and I am use 2000 Jeep 4.0 coil pack rail a dumb c...... Read more
    Asked by Kyle
    Answered by the admin

    The spark outputs are easy to check - set the spark output to Going Low with nothing connected, and you should have 5 volts on the spark outputs. Then change it back to Going High and confirm the voltage drops to zero.

    The QuadSpark module uses BIP373 coil drivers. We've just packaged them in a sealed case with a heat sink.

  4. Forgive me for needing spoon-fed but these kits will drive a coil directly with no need for an ignitor built in or otherwise, right?
  5. 0 votes
    Q Forgive me for needing spoon-fed but these kits will drive a coil directly with no need for an ig...... Read more
    Asked by Tom Slater
    Answered by the admin

    Correct. The BIP373 is an ignitor on a chip.

  6. So just like the quadspark I'd use the ms3x board to control them?
  7. 0 votes
    Q So just like the quadspark I'd use the ms3x board to control them?
    Asked by Tim
    Answered by the admin

    These could be installed internally to an MS3 using the LED outputs or in an external box, driven off the MS3X outputs.

    Answered by the admin

    That is one option. The other one is installing them internally as if you had an MS2.

  8. Hey i have the MS2 to run coil on plug do i need 3 of these or 4 four them thanks
  9. 0 votes
    Q Hey i have the MS2 to run coil on plug do i need 3 of these or 4 four them thanks
    Asked by jono
    Answered by the admin You will need a total of four BIP373s. These are currently not included with the MS2 V3.0 or V3.57 and sold separately as not all applications use them.
  10. Do I need to use the provided resistor if I'm using these for the ms3 pro? This is for a bmw s52 with stock coils. One driver per coil.
  11. 0 votes
    Q Do I need to use the provided resistor if I'm using these for the ms3 pro? This is for a bmw s52 ...... Read more
    Asked by Jon
    Answered by the admin

    With an MS3Pro, we recommend using a 100 ohm resistor inline. That is how the QuadSpark is built.

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