4CU --> 14CUX conversion - Defender Source
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  #1  
Old October 9th, 2012, 10:04 AM
neduro
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4CU --> 14CUX conversion

Looking for advice on taking my computer from a 4CU to a 14CUX.

Before I started looking at wiring diagrams and trying to figure out what I have vs. what I'd need, I thought I'd ask here and see if anyone's done it.

Questions of note:
- Will the sensors I have work for the new computer?
From measuring the 2002 stuff vs. what I have, I know the temp sensors, Throttle Position, and MAF all have different ranges depending on age of vehicle...
- What additional inputs are required for the 14CUX? Presumably, it needs more information than my existing computer, and I'd have to sort those inputs.

This thing is not going to get the best of me!
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  #2  
Old October 9th, 2012, 11:46 AM
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What is a 4CU?

Do you mean a 13CU like on an 87 RRC or do you have a "flapper" style ROW injection system?
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Old October 9th, 2012, 12:27 PM
neduro
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Quote:
Originally Posted by evilfij View Post
What is a 4CU?

Do you mean a 13CU like on an 87 RRC or do you have a "flapper" style ROW injection system?
My reading indicates that very early US range rovers had the 4CU, but I don't know that to be true for sure. It definitely was common ROW. It has a flapper style MAF.

I think the parts on my truck originated in an early 80's british rover.
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  #4  
Old October 9th, 2012, 01:41 PM
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I am in the process of using a Td5 main harness and a 14cux engine harness with a made up transmission harness. Most everything you will be changing will be in the engine harness I would think? The computer need very little aside from what is in the engine harness. Do you have a 14cux engine harness, if not you should be able to source a old Discovery harness. PM me your email and I can send you a few wiring diagrams if you don't have them.
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  #5  
Old October 9th, 2012, 01:52 PM
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If you have a flapper, I would just swap everything over from a 14CUX truck, but I have no idea how to do that short of getting a donor RRC or DI and taking everything. I don't know if anyone this side of the pond has done the conversion you are trying to do as all US spec trucks had the "hotwire" 13CU/14CU/14CUX set up.
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  #6  
Old October 9th, 2012, 01:56 PM
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Yep, just pull everything including the harness from the donor and swap over.... With a copy of the wiring schematic, it is quite simple.
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  #7  
Old October 9th, 2012, 02:07 PM
neduro
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What years of RR would have the 14CUX?
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  #8  
Old October 9th, 2012, 03:11 PM
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Mid 93-95, but a 14CU is just as good you just get a soldered in chip. What motor do you have now? It might be easier just to swap a whole running motor at the end of the day. A 4.2 out of an LWB has nice power gains over a 3.9 or a 3.5.
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  #9  
Old October 9th, 2012, 04:41 PM
neduro
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Quote:
Originally Posted by evilfij View Post
Mid 93-95, but a 14CU is just as good you just get a soldered in chip. What motor do you have now? It might be easier just to swap a whole running motor at the end of the day. A 4.2 out of an LWB has nice power gains over a 3.9 or a 3.5.
Just finished swapping in a motor... a 4.0 from a 2002 Disco. It runs exactly the same (+ maybe 10%) as the old 3.5, leading me to believe that the 4CU is the weak link.
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  #10  
Old October 9th, 2012, 04:53 PM
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What front cover did you use the one off the original 3.5? What intake is on it?

You will need O2 sensors and everything, but assuming you have the old front cover, I would look for a 1990-94 rrc and use that stuff.
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  #11  
Old October 9th, 2012, 05:06 PM
neduro
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Here's a picture of the install:



You can also follow my thread about the swap in all its painful, shameful detail:

http://www.defendersource.com/forum/...t.php?p=354629

Basically, I liked the intake manifold from the 2002 a lot more than the old POS that was on it (which is essentially the same one that would be on a 14CUX). So, I spent way too much time carefully fabbing solutions to mount all the sensors/ plumbing I needed onto the new manifold... to discover that my problems did not stem from the old manifold.

I think I'll go drink for a while now. :-)

------ Follow up post added October 9th, 2012 03:12 PM ------

Quote:
Originally Posted by evilfij View Post
What front cover did you use the one off the original 3.5? What intake is on it?
To answer the rest of your question, front cover is from a ~83 3.5, cam is a crowther with dist drive, and intake is the madness above.
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