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Hi just wondering if anybody could help me. I have the 620ti engine mounted up to my zs, i have used a 420 engine loom. which ecu do i use? the 620 ecu or the 420 ecu? also what other things will i need? any help would be great thanks, ste
 

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I would guess you use the 620 ecu as the 420 wont know how to fuel for posative pressure!

What other things you need depend on what you have now, is it mounted on engine mounts (all of them) with a functioning cooling system?
 

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all the cooling system is done, its on on all the mounts the rad and intercooler are mounted. ive plugged the 420 loom in, the only problem i see with using the 620 ecu is that it has 2 plugs on and the 420 loom just has the one
 

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I very much doubt the 420 loom is enough, it wont be connected to the pressure solenoid so you wont make full boost, I think the 620Ti has a fuel pressure or temperature sensor aswell that the 420 does not, in fact its probably got a few extra connectors to manage the turbo pressure and fueling, the 420 loom and ECU will kill the engine in minutes few.
 

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I would guess you use the 620 ecu as the 420 wont know how to fuel for posative pressure!

What other things you need depend on what you have now, is it mounted on engine mounts (all of them) with a functioning cooling system?
The 620 ECU! You will need to modify the loom of the 620 to fit the ZS or modify the loom of the 420 to have all the connection sof the 620.
 

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so far everything off the 420 loom has plugged into the engine. the only thing that isnt there is the smaller of the 2 plugs for the ecu.
 

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so far everything off the 420 loom has plugged into the engine. the only thing that isnt there is the smaller of the 2 plugs for the ecu.
It wont run properly on the 420 ecu, it will fuel and spark incorrectly and will register boost as manifold vacuum colapse, it sounds like you are a little out of your depth.
 

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You need the correct ecu, otherwise it will det its tities off
 

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Discussion Starter #11
i bought the turbo ecu off ebay, the one without the immobiliser in it. the only problem i have is the turbo ecu has 2 plugs an my 420 loom has one plug. how would i wire in the second plug?
 

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i was planning a similar transplant asked a few people and the best bet is probably a 620 ecu but still might cause wiring problems, i did a transplant with my 96 primera i swapped the standard 2ltr wit a nissan bluebird 2.0 turbo the engines were more or less the same minus air con but the wiring loom was difrent jus snipped the clip off the ecu and rewired it with the old conectors ran lyk a dream maybe you could do that witthe 620 ecu swap the connectors wit the zs
 

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Either ask AA autosport to make up a oom or find somewone else to do it, then use the 620ti ECU. You must have the boost control solenoid connected aswell or oyu will only make a tiny amount of boost.

There is a bloke on the metropower website who could make up the loom, dont know if he is on rovertech or .org but he has posted about making T16 looms in the past, he specialises in rover wiring mainly Metro VVC conversions.
 

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It would be easy if Rover had used the same colour wires on all their looms as you'd be able to splice the loom.

If you can get hold of the wiring diagrams for both you should be able to work out the colours, it's what I had to do for my maestro when I rewired the loom for the vitesse lump I had fitted by a so called expert.

This link may help as it tells you some of the bits from the wiring - http://home.btconnect.com/talkingcars/maestromods/electrics/T16engineloom.htm

Alternativly you could study the sensors on the 2 engines and see what colour wire goes to what sensor.

If you do splice the loom use proper terminals or solder them, don't scotch lock or worse -



and twist them togeather.

BTW this control unit was completly redundant after the conversion yet the so called expert left it in place.
 
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