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Updated 6/1/2018Applications: This works for the first generation Chrysler / Dodge / Plymouth Neon (both SOHC and DOHC motors), second generation Diamond Star cars (Mitsubishi Eclipse or Eagle Talon) with the 420A motor, and several other applications of this motor such as the various “cloud cars” (Chrysler Cirrus, Plymouth Breeze, and Dodge Stratus) in both 2.0 and 2.4 liter variations, and 2001-2002 PT Cruisers (later ones use the “second generation Neon” settings). This can also be used for second generation Neons, including the SRT4, with slightly different settings detailed in this write-up.
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This write-up uses the BIP373 coil drivers instead of the HEI modules mentioned in the MS1/Extra documentation. The VB921s around when the original Extra documentation was written would burn up if you tried to get enough dwell out of the coils. BIP373s don’t have this problem.
Using the QuadSpark on a Megasquirt-III V3.0 or V3.57 Board with MS3X
Hardware setup required:This one uses the VR conditioner for input. On a V3.0, jumper TachSelect to VRIN and TSEL to VROUT. On a V3.57, put main board jumper JP1 in the 1-2 location and J1 in the 3-4 location. Install the cam pull-up jumper (JP7) on the MS3X card. External wiring:
TunerStudio settings required:Under Ignition Options / Wheel Decoder:
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Nightscout Autotune
Direct Coil Control Distributorless Ignition on a Megasquirt-II V3.0 or V3.57 Board
Using MS2/Extra firmware, version 2.0.0 or higher
Hardware mods required:If you’re building this from a kit, be sure you add the stepper IAC jumpers. V3.0 input mods:
V3.57 input mods:
Now for constructing the outputs…
External wiring:
TunerStudio settings required:Under Ignition Options:
Under Dwell Settings:
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Direct Coil Control Distributorless Ignition on a Megasquirt-I V3.0 or V3.57 Board
Using MS1/Extra firmware – Does not support second generation Neon!
Hardware mods required:V3.0 input mods:
V3.57 input mods:
Now for constructing the outputs…
External wiring:
TunerStudio settings required:Under Codebase and Output Functions
Under Spark Settings:
Under Dwell Settings:
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Other things the ECU controls
Air Conditioning: MS3 can use its dedicated A/C control code. On other versions, you may control this with a relay.
Alternator control: You’ll need to add an external voltage regulator to control this. A lot of older Mopars use one that you can adapt. The MS3 code incorporates a “high speed field switching” mode that can also control the alternator.
Automatic transmission: The four speed automatic transmission is controlled by the ECU. If you have one of these, you will need to retain the stock ECU for transmission control, or use a MegaShift. Note that the three speed automatic used on SOHC Neons is mechanical. You would just need an on/off output to trigger the lock up torque converter.
Cooling fans: These can be run with a relay control mod or MS3X output.
Fuel pump: Use MegaSquirt pin 37 to control the relay.
Gauges: On the cloud cars, the ECU controls the gauges over a network, so we recommend leaving it in place for gauge control. On the Neon and DSMs, the only ECU controlled gauge is the tachometer. The MS3X’s built in tachometer control can run this. You can modify the ECU for tachometer control if you’re running an MS1 or MS2. See the tach output circuits in the MS1/Extra and MS2/Extra guides.
Travis Scott Without Autotune
Idle speed: First generation Neons use a stepper IAC that you can control with either the MS2 or MS3 stepper IAC outputs. MS1 does not control the factory IAC valve. Second generation Neons replaced the stepper IAC with a PWM type.
Travis Scott Autotune
What to Order
Here’s what we recommend for MS3.
MS330-K MegaSquirt III V3.0 Kit and MS3X expansion card, or MS3X357-C_BL complete MS3 with MS3X
QuadSpark ignition module
JimStim-K JimStim kit or JimStim-C complete JimStim, and StimPower power supply
MSHarness12 12′ wiring harness and MS3X-Harness wiring harness for MS3X board
TuneCable6 serial cable or MS3TuneCable USB tuning cable
If you’re buying an assembled MS2 unit, it will need special mods to work with the ignition, as described above. We can install these for you for an extra charge; please contact us for details.
If you’re building your unit from a kit, here is what we recommend for MS2:
MS230-K MegaSquirt II V3.0 Kit
2 x MK-BIP373 to add coil drivers
MK-RelayCtrl for relay outputs, as needed
MK-PWMIAC if installing on a second generation Neon
JimStim-K JimStim kit
MSHarness 12′ wiring harness (If you are wiring up a kit car from scratch, you could instead use a relay board, relay cable, and 12′ wire bundle, as shown on the kit car on this page)
TuneCable6 serial cable
USB-2920 if your computer doesn’t have an adapter port
If you are doing a parallel installation, we also recommend giving the MS its own coolant and air temperature sensors:
CLTIATwPiggy Closed element CLT sensor
IATwPiggy Open element IAT sensor
We also recommend a wideband oxygen sensor system for tuning.
DIYAutoTune is an MegaSquirt EMS/EFI manufacturing and distribution company.