Do I understand MJLJ correctly?

[4600cc]

I finally ordered all the parts, and I'll have everything put together as soon as parts arrive. The way I understand MJLJ is that it can advance timing based on rpm. There are 10 rpm ranges you can specify, be it 1000 rpm increments, or less. When small rpm increments are used, MJLJ will cover smaller engine rpm range. So far correct?

I will be using MJLJ on Ford 4.6L engine, it has a 6,000 rpm safe rev range. So basically my MJLJ will advance or retard based on 1,500 rpm increments. Is this one correct?

I wonder if MJLJ could be modified either hardware or software to control timing advance every 100 rpm or every 50 rpm for 800 rpm to 6,000 rpm rev range??



Also, about the configurable outputs. I have a manifold valve on my variable resonance intake manifold, it needs 12 volts to open, can one of those outputs handle it? What other stuff can those programmable outputs do? (other than shift light)



And another thing; where can I get that MJLJ sticker for the box? Is background white or transperant?


AL

[tailharder]

you have 10 rpm-numbers that you can specify. As the MJLJ holds the advance of the last rpm-number it found in the look-up table till it sees a new rpm-number that has the ignition advance specified I would say that you don't necessarily need even spaced increments.
For example:

rpm range: 500 880 1200 2000 3000 3500 4000 4500 5000 6000

I don't understand why you state 1500rpm increments for your 6000 rpm engine? That would yield 4 (or 5) rpm-numbers like 0 1500 3000 4500 6000, what's with the other 5 or 6 rpm-number you can specify?

[4600cc]

Ok, I mistyped there. 500 rpm increments starting at 1,000 rpm and going to 5,500. In any case, what I wanted to know is whether MJLJ has only 10 possible rpm ranges, and not "more" ranges based on 100 or 50 rpm increments. (that be 1,000 to 10,000 rpm in 100 rpm increments, 100 rpm ranges).. In any case, by looking at the tuning program I probably knew the answer, just making sure.

So what about the programmable outputs? What else, other than driving a manifold valve, I could do with them?

Another thing, this is perhaps the most important. The rev limeter. There is a wire on the harness, named rev limiter, that goes to PCM? If I don't connect it to ECC-IV or other PCM, will my engine rev past the limiter and blow? Or will MJLJ just not fire past the rev limiter rpm setting, and that wire going to PCM is to cut the fuel by half?

I honestly can't wait until I get all the parts!

[edowner]

From what I understand ECC-IV is the wrong EDIS module to have.

[brentp]

The "rev limit" output is intended to cut power to the coil- the EDIS system has no built in rev limit feature per-se. That's the only way I could think of implementing it. It's basically an RPM switch. So is the shift light, for that matter.

However, I think the EDIS module itself has an upper limit- I think it's a bit beyond 8000 RPM... Not sure exactly, though.

Now - to implement the rev limit feature you need to feed the rev limit output to a solid-state relay or power transistor which will cut the power to the coil. *Note that I haven't tested this before*.

For the other programmable outputs, you can do whatever you want with them- I have one control an intercooler fan and another one controls a intercooler sprayer.

Brent