How to Megasquirt your 3G Hemi

72BBSwinger said

Is there any reason you could'nt use the factory map sensor? Still kicking around WTH im gonna use but I have an 04 Truck harness and has the wrong coil plugs and cam sensor plug for my 6.1. Im also curious if the MS3 Pro needs coil drivers? I still cant swallow going the OEM route then needing an email tune.

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MS3 comes with a Map sensor already on the board, but there are additional unused inputs that could be configured to use the factory map sensor. It would take a bit of reading and you'd probably have to calibrate the sensor, not hard to do. MS3 and I believe MS2 allows for two MAP sensors. This is useful for someone who runs Pikes Peak. Normally when you start the car the MAP sensor takes a reading before there is any manifold vacuum and uses this initial reading for atmospheric pressure. This works fine as long as you stay relatively close to the same altitude. By having two MAP sensors you can place one so that it simply measures atmospheric pressure, this allows the computer to register changes in atmospheric pressure and thus change fuel enrichment depending upon changes in altitude. Like I said unless you're running Pikes Peak it is probably not needed.

Yes, you need coil drivers. Unlike Chevy LS motors the coils on the Hemi are "dumb" i.e. they don't have built in drivers. You'll need to use something like two of these:

http://www.diyautotune.com/catalog/quadspark-four-channel-ignition-module-p-481.html

Regards,

Joe Dokes