1.8 BPT MegasquirtII No Tach/CAS - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-27-2015, 10:22 PM   #1
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Join Date: Oct 2015
Posts: 2
Total Cats: 0
Default 1.8 BPT MegasquirtII No Tach/CAS

Hello all, I'm a total noob to this megasquirt thing. I'm trying to feel my way through the setup in my B2600.

So here's my setup:

Miata 1.8 Intake
Aftermarket Miata 1.8 turbo manifold
CT-26 Turbo
OEM Coolant Temp Sensor
OEM Distributor with new cap
1.8 EGT Ignitor
1.8 EGT Ignition Coil
OEM BPT Injectors/fuel rail
MegaSquirt-II Engine Management System w/PCB3 - Assembled Unit

Ok so i'll start by stating i originally was just going to use the OEM BPT ECU. I got it wired up and it was not putting out signal to the Injectors. At the time i could spray starter fluid in the intake and it would fire and run as long as I kept spraying. My mechanic buddy suggested i pull all the oe harness and switch to a megasquirt II.

I pulled all the wiring and started fresh by going straight to sensors and leaving them with pigtails. I ran new wires from all the sensors to the MS. I started by downloading a basic 1.8 Escort GT map and loading it. Currently the Coolant temp, TPS work great. I can't seem to figure out how to get Tach/CPS to work which I assume is why there's no spark. I am only using 3 wires off the DIZZY wiring;
Yellow / Blue = G signal not connected
Pink / Black = NE Signal going to pin 24 on MSII
White / Red = +12V
Black / Lt Grn = Sensor GND

On Tuner Studio the RPMs are not there at all. I guess my questions are these, am i wired correctly to the dizzy? Next what are the correct settings on the ignition tab?

Side note, the Injectors are working great now.


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Old 10-28-2015, 12:09 PM   #2
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Join Date: Oct 2015
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heres a pic of her

Matt @ DIYautotune emailed me back and suggested i get a 400-600 ohm resistor and put it on the NE signal and 12v ign wire to get tach going. He was spot on. So now i have RPM reading on the Tuner Studio. I still have no spark though. The ignitor is reading 1.8v when key is on or cranking. I attached my DMM to the 12v and ground of it.

Green/white: connected to 12v ignition
Yellow/Blue: connected to ignition coil (other wire on coil is blue and goes to ign 12v)
black orange: connected to pin 36 of ms brown wire

is this correct on the ignitor and coil? is that a proper reading on ignitor?
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1.8 BPT MegasquirtII No Tach/CAS-80-12063361_10102197025829787_5273105647203218663_n_d3ab5bd7c1d95e655c42e45d7ebbfbe097de84bf.jpg  

Last edited by David Phillips; 10-28-2015 at 05:36 PM.
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