Alan29
Active member
- Joined
- Jun 23, 2019
- Location
- Jax Adjacent, FL
Occasionally folks have introduced noise on signal wires coming in to the ms with proximity to outputs (esp high voltage outputs like coils), so I'd suggest you try and separate the outputs from the inputs as best possible in the loom.
Makes complete sense. Do you favor one type of shielding technique over another? I'm reading people using everything from foil, foil tape, gutted coax, etc to add shielding. I'm not sure I can keep them completely separate as I'm likely having them come through the same spot in the firewall at the passenger side...although I may consider going to driver side for the input sensors since I also have the kjet harness split over there and thats where most of those sensors reside in the engine bay anyways.
What Wideband O2 sensor are you using? Does it provide separate sensor and power (heater) ground wires? If not, you probably [?] want to wire WB02 ground to a MicroSquirt power ground at the MicroSquirt.
I'm not sure what's the best setup for +12v injector power and +12v MS power. I'd think that connecting these together near the injectors would be best?
The CAS uses hall sensor outputs, not VR, and thus has better noise immunity.
Going back to adding a factory 60-2 flywheel/flexplate vs. CAS, the issue you'll run into with a B21 block is the mounting of the CPS bracket. The B230 blocks have 2 drilled and tapped bump-outs in the bellhousing for the CPS bracket. The early B21 blocks do not have the bump-outs, but my 84.5 GLT B21FT block did have un-drilled bump-outs. Without the bump-outs, you'll need to make a custom CPS bracket -- it took me way too may hours to do this for a rebuilt '82 block (drill press, hacksaw, and metal file).
I'm planning on the Spartan 2 since I really don't need/want a display that goes with most the other ones. It also seems to get good feedback from users here as a no frills reliable WB that isn't a ton of money.
My plan for the 12V source for all is pretty much following the MS manual by getting it from the stock fuel pump relay harness. I'll of course make sure I'm getting proper voltage there, but I don't forsee it being an issue as that seems to be the popular source for the kjet to MS folks here. I'll have the 12v and 12v key on go to a terminal block where they will split to the two relays (main and FP). Pursuant to the MS schematic, everything that needs a 12v source for the install coming off a fused lead from the FP relay aside from the CAS which, from what I understand, needs to be triggered with a key on 12v source but not the FP relay since the MS won't trigger the FP until it gets a CAS signal. CAS would get its 12v from the main relay via fuse.
Yikes...I think I would have ended up the CAS route anyways even if I was aware of the flywheel swap with CPS option. Guess one could argue the end result is simpler/cleaner than the CAS, but the road to get there is more than I'd want to mess with for sure.
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