pcmhacking.net

This is a 1987 Jeep YJ with a 2.5L 4 cylinder engine. The first pic is where I was mocking up the late model port injection manifold in place of the throttle body injection. It also has a set of headman headers.

My plan is to run it on a 0411 with a V8 tune. I'm going to be turning off all the DTCs for those cylinders that are not used.

The first issue is the crankshaft reluctor.

I made one and mounted it on the front of the 4.0L six cyl Jeep engine in my 1988 MJ truck. I'm running it on a P59 using a V6 Bin. It runs so good I'm going to build a new engine to replace the one in it that has over 300,000 miles on it.

But I want to mount the CPS on this engine in the factory location. So after some measuring I've decided I can modify the flywheel to be the CPS reluctor.
I've laid out the flywheel to duplicate the V8 4X trigger wheel, 30deg on 90deg off (or maybe that's 30deg off 90deg on?). So I'll be cutting the shaded areas away as these are the off signal from the CPS. The first issue I've ran into is the old Jeep signal pattern leaves a gap where there should metal. So I'll have to warm up my welding skills, then have the flywheel rebalanced. I've got a 0411 with a 5.3L manual tune in it that I think I'm going to try. When I get the flywheel modified I'll up date the post.

I have a few questions for ya'll.
As you know from the title of the thread I'm going to run my 2.5L jeep on a 0411.
I have been setting it up to run on low res 4x crank trigger. But I have a 24x reluctor I can make a mount for on the balancer and plenty of room to build a sensor mount.
My first question is:

Do you think the 24x is worth doing?

What are the advantages of the 24x over the 4x?

If I use the 24x can I use coil near plug?

I have a 2000 1500 truck harness and computer I picked up at the u-pull it the other day. The OS is 09381344.
I have a 12212156 BIN and matching XDF I can load.

Hi all,

In order to run CnP ignition you would HAVE to run the PCM with a 24x reluctor.

The later 60 degree V6 engines have a 24x unit in the Balancer with a sensor bolted to the timing cover.

It might give you a starting point for yours as I believe that they are internally balanced.

Mike

24x is coil near plug only, 4x is distributor only

Ok so 24x it is. I want to run coil near plug. Now I've got to find or build a reluctor. I think I want to build it. I've got to build a mount for it anyway. It'll probably be easier to design them together.
I've been looking at 24x reluctors and they are not neutral balanced or will be hard to mount or both.


So does it have to have the double pattern? Or can that be modified to just one pattern? I was reading somewhere that with the right crank position sensor you can run a single pattern.

Correct, the OEM sensor will need the dual wheel, aftermarket will work with the single. Most suppliers of the timing wheels will also sell sensors.

Keep up the work and please keep us updated
This is an exciting one for sure

I had my own laser cut and it was cheap. I made it 7” in diameter and it worked great with a Cherry Hall effect sensor. They are hard to find right now

How do you align it to TDC #1 cylinder?
In other words "where is 0 deg" on the pattern?
I'm going to mount it on the balancer so how do I align it?

Cincinnatus wrote:

reluctor.jpg

So the crank position sensor aligns with the alignment hole in the reluctor?
Damn, that sounds too easy. LOL

Thanks