4.2 RRC LWB Chip into D90, things you should know - Defender Source
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  #1  
Old June 21st, 2008, 09:34 PM
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4.2 RRC LWB Chip into D90, things you should know

I finally got around to putting that 4.2 14CUX ECU into the D90 and what do you know, it works. What you want to do is swap the boxes, not the chip. The chip itself is soldered onto the board and it has this bluish coating over the entire thing. It would be a pain in the ass to unsolder every single connection on the chip just to swap it to the new ECU. You will have to swap the bottom half of the boxes because the brackets to mount the ECUs are different. The 14CUX label is luckily located on the top half to let people know what ECU you have. I have not installed my 4.6 block yet but I do truly believe that the truck is faster and more powerful even with the 4.0 in my 90. The hardest part of the job was unbolting the factory AC pack and moving it aside carefully.
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  #2  
Old June 21st, 2008, 10:34 PM
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This was for your 94, right?
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  #3  
Old June 21st, 2008, 10:59 PM
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If you eventually get the 4.6 I'm assuming the ECU for the 4.2 will work?

Does anyone know if it is worth upgrading with the "Tornado" chip?

Is the "Tornado" chip with the 3.9 ECU better than "regular chip" with the 4.2 ECU?
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  #4  
Old June 22nd, 2008, 08:24 PM
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??????

All NAS 90s (94-95) and NAS 110s have a 14CUX ECU.
This ECU has a removeable chip (just pulls out). Remove the Green plastic cover theat says "Lucas" and then pull the chip and insert the new chip (be that a Tornado or a 4.2 chip). I've done dozens and dozens and have never seen anything but an older RR Classic that had a fixed chip.
Only the very early 14CU and earlier systems had a fixed chip and none of those came stock in a NAS Defender.

Tornado chip alone is worth just under 1 second 0-60 and much improved mid range and low end throttle responce, but is really only needed when other changes like cam and injectors are made. Not for most here though, as it is pricey, especially with the crap exchange rate.

A 1997 GEMS car responds better to just a chip, but still pricey for the small gains you get.
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  #5  
Old June 23rd, 2008, 12:25 AM
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don't want to hijack but here is my question....

if I have a 4.6 conversion on my 95 NAS D90 which combination is "best"....

original 14CUX made for the 3.9 WITH a Tornado chip

OR

14CUX from a 4.2 RR Classic (no Tornado chip)

I am assuming the Tornado chip in the "older ECU" is better but don't know....
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Old June 23rd, 2008, 05:02 AM
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Scott yes this is for my 94 D90 but I installed a 4.0 5 years ago. Mike, I just opened up my ECU cover and this is what I see. The Lucas box / cover is there except it is not green but black. I flipped the board over and whatever is underneath that cover, it is not comming off because there arms are all solderd to the board. The cover itself does not want to come off either. I swear I am staring right at it and I have only had 2 drinks tonight and that was several hours ago. I can take a pic if you want to take a better look. It is indeed an NAS 94 D90.


PS, I already have a 4.6 block I just haven't gotten around to installing it because I already dumped money on that 4.0.
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  #7  
Old June 23rd, 2008, 05:56 AM
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Quote:
Originally Posted by ECR
??????

Only the very early 14CU and earlier systems had a fixed chip and none of those came stock in a NAS Defender.

.
Isn't he refering (original post re-read required) to the ECU out of the 4.2 LWB?.....which shouldn't be a fixed chip either, unless someone had swapped in an older 14CU and put the CUX cover back on......
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  #8  
Old June 23rd, 2008, 06:22 AM
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Neil,
Yes, the cover for the chip can be black too, thats just an older one.
The socket for the chip is fixed to the board, but the chip itself pulls out of the socket.
The "Lucas" cover is glued on, it takes some effort to get it off but what you need to change is underneath it. You can swap ECUs if you like, no issue at all, but sort of like Matt said, the 4.2 LWB ECU does not have a fixed chip either. You are just looking at the wrong thing.
In the 4.6 we just did last week there is a picture of an ECU with the Lucas box off and a new chip installed, that might help some when you compare to your ECU. Swapping your ECU is fine, but just wanted to clarify to others that the 14CUX does not have a fixed chip and you can swap chip with ease.
Here is the link:
http://www.eastcoastrover.com/130phase3.html
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  #9  
Old June 23rd, 2008, 12:50 PM
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Thanks for clarifying Mike, I guess there is more underneath that cover that I have not seen yet obviously. The black cover will move side to side but for some reason or another will not come off. I was scared to take it off last night after reading your post because it seemed like the board started to bend a bit and I didn't want to crack it. More importantly, I am glad there are no issues with simply swapping the ECU's as that obviously makes the job a lot easier. So far there have been no issues yet and its been two days, no codes, stutter etc. I even noticed better mid and high range too. I guess I now have this 3.9 box I can tinker around with if I ever plunk down some coinage for a tornado chip. Thanks Mike and everyone for the clarification.

Neil
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Old June 23rd, 2008, 02:41 PM
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Just swap the boxes, but you can swap the chips too.

I am sure the tornado is better, but the 4.2 chip works great as well.
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Old June 25th, 2008, 06:21 AM
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The 4.2 chip is a nice slight upgrade if swapping into a 4.0 or for a stock 3.9, but not really up to the task for a healthy 4.6. It'll run lean and 4.6's don't like that....at all. The Tornado chip, long term is a smart investment, and well worth the money.
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  #12  
Old June 25th, 2008, 12:08 PM
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Quote:
Originally Posted by junkyddog11
The 4.2 chip is a nice slight upgrade if swapping into a 4.0 or for a stock 3.9, but not really up to the task for a healthy 4.6. It'll run lean and 4.6's don't like that....at all. The Tornado chip, long term is a smart investment, and well worth the money.
Not trying to dissent here but Ron has mentioned previously that a 4.2 chip serves a 4.6 quite nicely. I wish we could run some kind of independent test or have someone who has done this set up long term chime in with their results.
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  #13  
Old June 25th, 2008, 12:20 PM
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A 4.2 chip in a stock 4.6 will work "OK". The program differences are very very very very minor. You won't be seeing big gains. You may think you are, but the numbers don't back it up. I've dyno'd just about every chip combo out there and some day I'll write it all up for the web site.
The 4.2 is usually done because it is cheap and will work OK.
Matt is right, when you get into changing injectors and doing cam or head work you'll want to upgrade to something better.
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  #14  
Old June 25th, 2008, 12:36 PM
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Thanks for the clarification Mike, I look forward to that write up. I was planning on using the stock 4.2 cam on the 4.6 as its set up for distributor use and was hoping the 4.2 chip would be adequate for this combination. I'd like to eventually upgrade to a tornado chip as well.

Neil
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