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Got my MPI engine on the stand today and stripped it down so i can get my engine back together.

I also dug out the 4.0L HO TB I have been saving for the swap. here is the TBI setup next to the 2.5L and 4.0L,apperently my 2.5L has been suffering from asthma.

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Good luck! I'm rooting for you. I'll probably end up stealing a bunch of your ideas, by the way.

 

I've been thinking of going MPFI for the sake of forced induction, but then I stumbled upon some stroker builds that seem like they would work as NA builds. I'm honestly torn.

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Its more of a Renix vs. HO problem. The TBI doesnt really matter, I currently have a 4.0l Renix cluster in the truck.

 

I am planning to run the Renix senders for the dash and I will also plumb in any senders/sensors that the MPI requires,so some sensors may get doubled up.

 

As for the speedometer, the early MPI Wranglers up to about 93 used a pass through speed sensor with a cable speedometer. So I will have the speed sensor for the computer but can keep the stock guage.

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Here is the VSS

 

 

You need an adapter to adapt it to the stock speedometer cable,the renix jeeps with cruise control have a speed sensor behind the guages that uses the correct adapter, you could probably get one from a speedometer shop but the stock ones are easy to find at the junk yard.

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I did a bit of research on the swap, there is almost no information on swapping MPI onto a 2.5l but there is lots of info on swapping the 4.0l injection onto a 4.2l which is a very similar swap.

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Havent had much time to play with the MJ lately,today i was able to reseal the oil pan and replace the rear main seal then move onto the inertia ring set up.


I got out the bathroom scale and compared weights,the inertia ring add roughly 9.5 lbs to the flywheel.

i installed my adapter pilot bushing,this will allow me to go from the 2.5L flywheel to a 93 and up AX15.

here's the old pilot next to the new one.

and installed

Everything was going smoothly till i bolted it on,the guy who made the ring made it to have 0.015-0.030" clearance with the engine block. apperantly his block was cast a little different then mine so there is a clearence issue.

should be an easy fix though.

I also got the engine most of the way back together and got most of the engine wiring installed,now i need to start putting the vehicle and engine harnesses together. hopefully i can get it to fire up soon.

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  • 2 weeks later...

Havent touched the MJ since my last post so today I decided to tackle the inertia ring issue. For anyone wondering laying under an engine block and clearancing it with a diegrinder is not a good time.

 

I ended up taking off more then I originally thought but it fits fine, I also installed the new Centerforce clutch disc and the pressure plate.

Now I can bolt up the trans and install the CPS.

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  • 3 weeks later...

I have been getting ready for NAXJA's NWfest so not alot of progress on the MJ. I took my daily driver XJ but didnt wheel it, I had an awesome time but really wished the MJ had been ready.

 

Today I spent a little time in the garage and got the AX15 mounted up.

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Its a 93 AX15 that I converted to external slave, I used a Dakota bellhousing with a centerforce clutch disc and an Advanced Adapters pilot bushing to adapt it to my 2.5l.

 

 

EDIT:

 

96-98 2.5l AX15 Dakota bellhousing, I've been told that the 99-02 2.5l Dakota NV1500 bellhousing also bolts up,main difference is that it uses a bellhousing mounted starter instead of the block mounted starter.

 

You need a Centerforce clutch disc #383824 or a disc from a 1984 Camaro 2.5l 4spd if you can find it.(must be 4spd,5spd will not work).

 

If you have a 92 or newer AX15 you can use Advanced Adapters pilot bushing #716167,for 89-91 AX15 you would probably need to have one made.

Also if you use a 89-93 AX15 you will need to convert it to external slave.

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  • mnkyboy changed the title to Mnkyboys 89 Comanche project

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