Megasquirt on a 1988 Dodge W100

[apehead]

Hello, I've been doing some reading on the system, and I would like to purchase and install one on my truck, because the stock ECU tables don't take kindly to any sort of engine modification. I've taken a look at the mega manual, but I still have a couple of questions:

If you choose a MAF, or a MAP/MAF combo system, do you still tune the tables, or is the MAF more hands-off? Would I have to re-tune the system after an engine change (new heads, hotter cam, etc.) with a MAF system?

Has anyone installed MegaSquirt with Chrysler sensors or ignitions? They aren't really mentioned in the manual.

- Jack

[Matt Cramer]

MAF will still need a bit of tuning, particularly with the spark table. The fuel side will adjust a bit more for different mods.

I've heard that the TBI setups had a four tooth trigger wheel in the distributor, with the stock ECU triggering off both the leading and trailing edges. This is a bit of an oddball if that claim is true. Using the Lean Burn / ESC distributor from a few years earlier, though, is pretty easy. See this link for details:

http://www.DIYAutoTune.com/tech_article ... engine.htm

[apehead]

There is a trigger wheel in the distributor? What does it do?

[Matt Cramer]

It's what turns the Hall effect sensor on and off. Tells the computer what the engine RPM is and when to fire the spark.

[apehead]

So you think the timing wheel in this distributor has 16 teeth, as opposed to just the normal eight (for a V8). If I disassembled it, is that what I'd be looking for?

[Matt Cramer]

I've heard they have four teeth instead of eight.

[apehead]

That is strange... So just get an old fashioned eight tooth distributor and call it good for MegaSquirt?

[Matt Cramer]

Yep, that's a pretty straightforward thing to set up. If you want to get fancy you could put a 36-1 trigger wheel on the crank.

[Flo]

I installed an EDIS-system on my 318 LA. So put the 36-1 wheel on the crank pulley. I can send you the drawings if you like.
But I am using a Volkswagen-sensor for the VR-sensor (I am situated in Germany).
Currently not running Megasquirt yet, only Megajolt and a carb. In the process of getting injected.