Megasquirt ems

I haven't set mine up yet, Hell I haven't even bought the ECM yet but I have done a lot of the research, and bought a few parts. Here's a couple of things that I can tell you.

You can use Megasquirt, and tuning is getting easier all the time, if you spend a little extra and get a wide band O2 sensor, the thing will practically tune itself. Megasquirt now has an Autotune feature, that utilizes a wideband O2 sensor to dynamically tune the motor.

You'll want to go with Megasquirt III which will allow you use the factory coil on plug coils, the factory CKP (crankshaft position sensor) CMP camshaft position sensor. The MS III controller will allow you to do fully sequential fuel injection, and spark. Megasquirt III, can even utilize your factory Knock sensors, though it requires some extra work. The Gen III hemi uses a crank and camshaft tone ring very similar to those used on the Dodge Neon, and thus there have been people Megasquirting Hemis for a while now.

You'll need to replace the drive by wire throttle body with a cable operated throttle body complete with a TPS (throttle position switch) and IAC (Idle Air Control). Mopar Performance has an 80mm throttle body, (the same size as stock) but it is pricey at $500.00. Or you can use an Chevy LS style cable operated throttle body, Fuel Air Spark has an adapter for $68.00 that works with their 92mm cable operated throttle body. I made my own adapter and am using a 85mm POWER throttle body I bought off of ebay for 100.00. Incidently the opening on the 6.1 Hemi Manifold is right at 84-85 mm so an 85mm throttle body seems like a good fit to me.

The above poster is correct, the guys at DIY Autotune have installed megasquirt on a 6.1 or 392 Hemi Challenger. They've promised to do a write up but right now all that is available on their website are a bunch of pics of them doing the wiring.

One last thing, if you build your own box and make your own wiring harness, Megasquirt is the CHEAPEST way to get a modern hemi going. A spark controller, Manifold, and Carb will run you right at $1500.00. I'll have just under a thousand into my megasquirt setup when all is said and done and that includes the following:

Megasquirt ECM
Wiring Harness
Fuel System, including pump, regulator, and filter
Throttle body and sensors

Hope this helps.

Regards,

Joe Dokes