JEEP CHEROKEE 2000

[gsune]

Hi, i´m Gustavo Suñe from Venezuela, i have a jeep cherokee 2000 4.0 D.I.S
i aready buy a Megasquirt V3 MSII and i want to install it in my car.
i´m new in this things and i want your help how to make the wires, plug, tach signal to the cluster, etc.......
can i keep my trigger wheel or i must install a new one in the damper?
Thanks

[jsmcortina]

You will need to do some research. I think that your engine _may_ use the "NGC 36-1+1" wheel pattern that is already supported by the MS2/Extra code. I am not sure. Can you get access to any service manuals for your engine?

James

[Matt Cramer]

It's not an NGC wheel. The Jeep has 3 equally spaced clusters of 4 notches on the crank trigger. I wasn't able to find the spacing between notches, but I did find the note, "The trailing edge of the fourth notch, which causes the pulse, is four degrees before top dead center (TDC) of the corresponding piston." It is combined with a Hall effect sensor spinning at cam speed with a single 180 degree tooth.

[gsune]

this is the flyweel whith the trigger wheel

[Matt Cramer]

Just for clarification: The bumps we see in the middle of the notches and at the right side are behind the trigger wheel, correct? Just wanted to make sure.

[Matt Cramer]

Interestingly, this looks like the Avenger trigger wheel from this thread:

http://www.msefi.com/viewtopic.php?f=89 ... er#p209027

That guy had it easier, though, as he had a distributor.

[jsmcortina]

If you can get details on the angle between the teeth and their postion i.e. plot them on a 360 degree pattern then it would be relatively easy to add a custom wheel decoder to MS2/Extra.
However, this won't be going into 2.1.0 as we are on code freeze. It is likely to make it in the next development stream of code though shortly after we make the 2.1.0 release. (There are some other decoders and bits and pieces we want to add AFTER the 2.1.0 release.)

James

[gsune]

Just for clarification: The bumps we see in the middle of the notches and at the right side are behind the trigger wheel, correct? Just wanted to make sure.

Yess, it is where the starter make spin the engine ( sorry my english)
it doen´t have to be whith the trigger wheel

[gsune]

Hi. i have another question. how can i trigger the megasquirt whith the cam hall sensor? it is 180 degree only. it doesn´t have 6 teeth
thanks a lot

[1LONEJEEPER]

here is one for u..



it is on a 1990 jeep wrangler 4 cylinder 2.5l
at least I think that is the right flywheel...

[UnaClocker]

here is one for u..

it is on a 1990 jeep wrangler 4 cylinder 2.5l
at least I think that is the right flywheel...

Going to need a lot more info than just a picture..

Before that process can start, the following need to be satisfied.
- compatible sensors (hall, opto or standard VR)
- accurate degree timing diagram of crank and cam wheels (see attached template)
- ability, time and commitment to test the code

[1LONEJEEPER]

Before that process can start, the following need to be satisfied.

Ok most of this cant be met

- compatible sensors (hall, opto or standard VR)

I have a standard crank sensor

- accurate degree timing diagram of crank and cam wheels (see attached template)

That is kind of hard when I dont have the trans out of it

- ability, time and commitment to test the code

I'd have the commitment to test but I don't have a ms to test with...

[jsmcortina]

- accurate degree timing diagram of crank and cam wheels (see attached template)

That is kind of hard when I dont have the trans out of it

Without that information it is impossible to write the code.

However, this looks like a fairly easy pattern and you could likely count ring gear teeth to determine the angles.

James

[jsmcortina]

Hi. i have another question. how can i trigger the megasquirt whith the cam hall sensor? it is 180 degree only. it doesn´t have 6 teeth
thanks a lot

The cam sensor alone does not provide enough information.

James

[UnaClocker]

Being a Mopar, this information is probably laid out in great detail in the FSM.. Just an idea..

[porelmundo]

Recently I build a Cherokee and at that time have some problems decoding the remix wheel and I instead to change the CAS to an old CJ4 6 cylinders and overcome all those coding problems until there are some support for this patterns.
I have a few maps if you need them or if you need some help. Me dejas mensage, yo estoy en Puerto Rico.

[jsmcortina]

Have you measured the angles yet?

James

[gsune]

Hi James. thank you very much for your interest in helping me.
I don´t have any idea how to measure it, but i tried whith powerpoint
can you explain to me how can i do this job?
here is the picture

[jsmcortina]

The way the MS2/Extra wheel decoder works, we do need to accurately know the position of the teeth.
If you have the wheel off the engine, then you could run a tape measure around the outside to measure the circumference and then measure the position of the teeth. I am assuming this uses a VR type sensor on the crank, so you only need to measure the position of one edge (really the centre) of each notch. This answer needs to be right to within one degree worst.
We also need to know where the pattern aligns with the engine firing order, but I think Matt's data already tells us that.
Then, we also need to know where the cam sensor/lobe align. You can likely tell this by rotating the engine and reading the angle from the crank damper, but you may have to be creative here.

James

[gsune]

Hi, i think it´s use a hall sensor because it has 3 wires.
and yes, i have to be very creative here. because the cam sensor is closed and i can´t see the position of it