Putting a 4.6 in my 97 D90 - Defender Source
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  #1  
Old December 18th, 2010, 10:14 AM
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Baird M. Gehring
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Putting a 4.6 in my 97 D90

So I found a brand new 4.6 Rover short block to swap into my D90. I'll be using my original heads and basically all the good parts off my old engine, got a new 4.6 camshaft, lifters, timing kit, hose kit. I have been told though that the engine will run fine without any modifications but it will run better with a 4.6 chip in the ecu. Can anyone advise me on rechipping my ecu and where I can get a chip for a good price (>$500). Perhaps I can get one out of a salvaged 4.6 P38?

------ Follow up post added December 18th, 2010 11:16 AM ------

less than $500 *
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  #2  
Old December 18th, 2010, 12:43 PM
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You do not need a new ECU. GEMS ECU ('96-99) are the same for both 4.0L and 4.6L motors.

Tell the mechanic that is doing the swap to change the ECU settings from 4.0 to 4.6 in the petrol engine management settings screen with AutoLogic.

Carlos and I did it on my 4.6L
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Old December 18th, 2010, 12:53 PM
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Have Rod Dassler at Rovers down south "fix" your heads you will be much happier with the performance.
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  #4  
Old December 18th, 2010, 01:17 PM
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Jake K.
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Why you're do'n all this you might as well cut the trumpets down. It gets rid of that top end lag/wall you hit when you're get'n on it. 3/4 of an inch....less than that doesn't do much,but more than that seems to mess with the bottom end push. Your ECU will adapt fine, but change over from 4.0 to 4.6 internally with Testbook,Auto logic,Rovacom,ect. Good luck.
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Old December 18th, 2010, 04:54 PM
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Quote:
Originally Posted by rrc.swb View Post
You do not need a new ECU. GEMS ECU ('96-99) are the same for both 4.0L and 4.6L motors.

Tell the mechanic that is doing the swap to change the ECU settings from 4.0 to 4.6 in the petrol engine management settings screen with AutoLogic.

Carlos and I did it on my 4.6L
This is a myth.
The P38 ECUs contain the programs for both 4.0 and 4.6, but the stock NAS 1997 Defender ECU only has a 4.0 program in it. It does not contain a 4.6 set up.
Yes, it still retains the P38s ability to switch back and forth between 4.0 and 4.6 on the Autologic screen, but it does nothing in a 1997 NAS Defender ECU.
You just changed the number on the screen. You did not change any parameters or anything useful.

In working with Mark Adams of Tornado systems here at ECR I have seen the inner workings of the GEMS set up and there ain't nothing for a 4.6 in there, sorry.
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  #6  
Old December 18th, 2010, 05:56 PM
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JORGE ESPINOZA
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I put in the 4.6 chips and my idle went to 600 rpm and I do feel a difference in power . The 90 accelerates alot smoother but I did get an error code for transmission security check . I then started to play with both chip set and now the code is clear . The solution was to change only the bigger of the two chips and the code cleared, LR tech stated that the bigger chip controls the engine and the smaller chip the ancillaries . All this was done at LR dealer using their diagnostic laptop . They set the parameters to 4.6 and concurred with ECR's statement that the chip must be replace . My 90 is quicker and a lot smoother . Just did this upgrade about 3 weeks ago and so far everything is fine .
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Old December 22nd, 2010, 11:13 PM
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Baird M. Gehring
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Still, could I get a 4.6 chip out of a salvaged/junked p38 or something of the like? Don't have big bucks to drop on a brand new little chip. My 4.6 should run fine w/ the 4.0 in there anyways right?
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