Vehicle & Technical > Defender

Two ECU's???

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William:
I thought the standard td5 factory spec was 138bhp?

diesel_jim:
122bhp for a defender.

think the disco's are slightly more.

garybrun:

--- Quote from: "diesel_jim" ---For the cost of it (about £200 from bearmach) why not invest in a nanocom unit?

that way you can upload your standard 115bhp map for MoT time, then re-load the 250bhp map for play time, plus you get the added advantage of being able to keep a useful eye on your engines health.

not done it myself yet (about to buy a nanocom) but apparently it takes about 10 minutes to upload the different maps. and IIRC the nanocom unit can store 10 in its memory.
--- End quote ---

Ill call J Fearn and see if it will work.
The cool thing though is just to be able to switch from one to the other instantly.

diesel_jim:
There was a thread about this on LR4x4 a while back.

Porny, who works for LR engine design team and is a whizz on Td5's reckons that the ECU's won't like being "powered up" mid flow kind of thing, and it would probably make them cough and stutter in a big way.

the concensus was that if it was possibe to run two ECU's, you'd have to piggyback each wire, and have a relay changeover system for the main power cables/fuel pump feed etc.

don't know how it would work though. both ECU's obviously would need to be programmed with the alarm codes and injector codes. i dont know if the alarm ECU needs to turn the engine ECU "on" before the engine has actually started, if not, you could "flick the switch" and possibly need to bump start the engine (as you'd be moving?) to fire it up again.

one way to find out... buy a hand full of relays, a spare ECU and give it a go!  :lol:

Porny:
In theory it could be done....

But the igntion would have to be off when the change was made etc etc.... and I doubt it would be worth the hassle.  (although I might look into this in a bit more detail  :wink: )
I'm sure JF has done this before in some of his race cars, so might be worth asking him.

Personnally I'd just have two ECU's - both coded to the car, so just a case of unplugging one, and plugging the other one in when needed.  As standard it is only 3 bolts and two plugs - and it wouldn't be hard to work out a quick release mounting.

As you've mentioned having two chips...  would I correct in thinking your Defender is pre 2002??
In which case, using a Nanocom to swap between files wouldn't work.... as your ECU would be a none flashable type.


Ian

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