I was experiencing electrical issue with my car and decided it isn't worth my time to troubleshoot the 32 year old computers or wiring. Wanting to keep the car, aftermarket ECU is the only option and Megasquirt / Microsqurit sounded good.
Wanting to keep everything simple, I went with batch firing injectors and waste spark ignition system, so the compact\slightly cheaper Microsquirt would work fine for me. I will only need one crank sensor and a 36-1 wheel welded to my crank since factory turbo HEP is not supported and I never like that HEP sensor anyways.
For reference.
https://en.wikipedia.org/wiki/Chrysl...%26_2.5_engineThe LM used a Motorola 6803U4 processor operating at 1 MHz, with 256 bytes of RAM and either two 8K EPROMs or one 16K EPROM.
From 1988–1989, a SMEC (Single Module Engine Controller) was used. This was a complete redesign of the older system, using modern CAD for board design, and higher density SMD components. The processor was a 68HC11 operating at 2 MHz with 256 bytes of RAM and a 32K EPROM. Functionally, the SMEC was the combination of the earlier Logic and Power modules into one unit. Starting in 1990, a more advanced SBEC (Single Board Engine Controller) was used, which integrated the earlier two board computer into a single board.
MicroSquirt uses 16-bit MC9S12C64 at 24 MHz, ROM is 128 kB, and RAM is 4 kB
https://en.wikipedia.org/wiki/MegaSquirt
My Microssquirt input/outputs are the following.
Inputs are:
crank/hall sensor, shielded from the shielding of a coax cable. Thank you A. J. for the tip. (no need for cam sensor)
coolant temperature sensor (Chrysler sensor)
air temperature sensor (open element Chrysler sensor)
throttle position sensor (Stock Chrysler sensor)
ethanol sensor (GM sensor)
o2 sensor (AEM Uego with 5v output)
manifold absolute pressure sensor (GM 3 bar map)
knock sensor - All MS needs a knock sensor controller. I use lilknockmeter by http://www.insaneimportperformance.com/ which can display light, has headphone output, has on/off digital output, as well as analogue output... :yeah!: Dodge 2.2/2.5 are very noise engines. Stock ECU consider .8V is a knock at 2000rpm, while it consider 4V is a knock at 4000RPM. So I need something that can give me an analogue output.
A/C sense wire - wired to the a/c control so microsquirt can raise idle speed if a/c is on.
Outputs are:
idle control, ford PWN idle valve. Edit: Upgraded to Volvo BOSCH valve.
tachometer
two set of Ignition coil (goes to 420a coil)
two set of injectors (75lbs low impedance injectors with a Volvo injector resistor)
a/c cut off relay wire
fan relay wire - works great.
fuel pump relay wire
Boost control is handle by my HDi electronic boost controller, and I am very happy with that.
Added an external voltage regulator, super easy to do.
Megasquirt has more options I'm sure, but I don't need them, why pay for them?
I have almost $1500 into parts plus shipping
Microsquirt + 8 ft harness $369
36-1 wheel $32.00
Weld 36-1 wheel to crank $100
crank sensor $43
QuadSpark $89.00
MAP sensor connector $8.50
MAT sensor connector $10.00
ECT sensor connector $10.00
TPS sensor connector $10.00
420A wires $20
420A coil $20
Wiring Connector packs $30
USB to serial $15
Misc wires $40
Uninsulated crimp $20
Crimp tool $13
Shrink Wrap $10
Misc bolts $15
Relay $15
Fusebox $25
Fuses $5
E85 sensor + connector $80
lilknockmeter $120
Bosch knock sensor + wire connector and stud. $40
Injector resister $30
wire loop $20
On/off Solenoid valve for idle control $30 (upgraded to a FORD PWM idle valve for wider RPM control). Edit: upgraded to Volvo BOSCH valve for more air flow for my a/c control.
3m tape $6
Tuner Studio + Megaviewer $80
etc...
Separating engine harness with body harness.
Test Mounted.
All needed wires labeled.
Made bracket for crank sensor.
Welded and ready to be worked on.
Painted the crank and reinforced bracket.
Mounted my 420a coil on my distributor, after taking all the moving parts out of the distributor. The distributor mounted like that is due to lack of space. I'd like to change my oil filter without taking the coil out.
Some people have coil on plug, I have coil on distributor
After some long hours, the car started on Microsquirt yesterday.
Top right corner is my ethanol sensor.
I still have a lot to do but just hearing it start again was so nice. Now is clean up and tuning time.
http://minimopar.net/ and factory repair manual will be your best friends. Thank you Russ W. Knize for minimopar!
Micrsosquirt Manual http://www.msextra.com/doc/pdf/html/...dware-3.4.html
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