MSD BTM Help

[VWBMW]

Hi,

I'm trying to install an MSD BTM on my boosted '84 318i... here's the way I have it hooked up:
- white wire from BTM to signal wire from ignition module
- orange wire from BTM to coil - (replaces signal wire from ign. mod)
- red wire from BTM to coil +
- black wire from BTM to ground
Car will not run with this hook-up... ignition pulse is present when checking at coil -.

[johnfuston]

A friend of mine just went through the same thing. I'll send a link to a him in hopes that he will post a reply here. Rgds... - John

[AllanD]

Hi just installed a twin MSD 6 BTM systems on my Twin turbo 850i and ran into the same issues as you. More than likely you need MSD part # 8910, tach adapter. This amplifies the ignition signal so that it becomes usable by the motronics unit again otherwise the MSD 6 BTM pulls down the signal to the point that the engine mgmt system cannot detect it. A addtional things, the white wire is the correct wire to use for the trigger and should be connected to the original negative coil wire, the red wire goes to the orginal coil positive wire. Orange wire goes to ignition coil positive and black wire goes to ignition coil negative. I hope this helps/97 540i sport 6 speed
92 850i 6 speed
85 655CSI 6 speed

[VWBMW]

Are you sure about the orange & black wires? It clearly states that they go to coil - and ground!

[johnfuston]

- John

1992 BMW 850iA Twin Turbo - Black/Silver. H&R's, Bilsteins, K-Bars, Conforti Chips. Oodles and Gobs of HP and Torque.......

[VWBMW]

Thanks that would be great!

What confused me in the beginning was that on the stock coil, the green wire is + and the 2 black wires are -. I had to look up the wiring diagram to make sure.

[VWBMW]

I have the Universal MSD BTM #5462.

[AllanD]

Yes there are 2 Black wires, the heavy black goes to ground. The black wire, paired with the orange wire in a separate insulated sleeve goes to the ignition coil negative.97 540i sport 6 speed
92 850i 6 speed
85 655CSI 6 speed

[AllanD]

This unit requires a separate MSD 6 box, right.97 540i sport 6 speed
92 850i 6 speed
85 655CSI 6 speed

[VWBMW]

[VWBMW]

Boost Timing Master... it works with stock ignition module & coil. No added MSD box (6 BTM) is required. I received some great info from a fellow who installed the same unit, will follow his instructions next weekend. Will post results then.

[VWBMW]

MSD Tach adaptor #8910 needed to be spliced in before the BTM so that the stock ECU & Ignition module get a good coil signal.

BTM works great, I can feel the timing being changed if I turn the dial from 3 to 0 while at a steady 5psi boost.

Just have to build my MegaSquirt and get larger injectors so that I can crank up the boost.

Thanks again!