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Old 04-03-2021, 01:37 PM   #1
TimS
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Default bosch to megasquirt tach input

I'm trying to put a MS2 on a 1984 240 kjet turbo, IC, but don't want to get into ignition control( right now). Can I just go right from the coil or do i tap into the trigger wires from the dist.?
If I use the wires from the dist. do I just tap into each wire and back to the computer
at VR1 and Vr2, with it still connected to the bosch black box?

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Old 04-03-2021, 01:52 PM   #2
bobxyz
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Normally, for fuel-only, you tap off the coil negative "-" tab. You need to build the MS2 Coil Negative circuits.

I don't know how Bosch Breakerless connects the 2 VR signals from the distributor. If it grounds one of the signals, you might be able to tap off the other VR wire to MS. (MS expects one of the 2 VR wires to be grounded.)
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Old 04-03-2021, 07:34 PM   #3
TimS
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it is actually a microsquirt, so its ready for both. The manual says the same thing about the - side of the coil, but i mentions not to do if its a CDI unit. I'm not sure if that's the same as what a Bosch system is. I was hoping someone would say that they've run MS like that.
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Old 04-04-2021, 10:25 PM   #4
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MicroSquirt is easy - connect the Opto +/- wires to the 2 tabs on the coil -/+ (they cross Opto+ to - tab).

CDI is the same thing as an add-on MSD red high-voltage multi-spark ignition box, not the factory Bosch Breakerless ignition.

Once you want to go beyond Fuel Only, you'll need a LH2.2 distributor, or will need to modify the Turbo K-Jet distributor to lock down the vacuum and centrifugal advance mechanisms.
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Old 04-04-2021, 11:42 PM   #5
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I think You can also trigger the MS off the tach output of the power stage.?
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