Has anyone replaced a S1 Disco 3.5 or 3.9 with the newer 4litre S2 Disco motor with the Bosch injection. Firstly are the physicals the same such as engine mounts, bell housing connection, exhaust, radiator hoses, ...
Secondly does the ECU need changing and are the wiring connectors the same on the ECU or would the wiring loom require modifying and are items such as the air flow meter, coil, inlet / outlet purge valves, fuel tank pressure sensor, instrument cluster. ... the same or require replacing / modifying.
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Replacing a 3.9 with a 4 litre in a Disco
Moderator: Micka
Physically it should be the same. The D2 4.0l does not have a distributor but if you are buying a complete moto that should not matter.
I would imagine you would have to buy the complete loom and computer, or an aftermarket computer as there were a lot of differences in sensors etc between the 3.9 and 4.0 litre
I would imagine you would have to buy the complete loom and computer, or an aftermarket computer as there were a lot of differences in sensors etc between the 3.9 and 4.0 litre
Thanks,
Adam
Adam
I have put a Thor manifold on my car so am aware of some of the issues.
The "Thor" injection runs at a higher pressure with a non return system. You could get around this by using your old 14CUX. However your Disco rail will not fit the Thor, but a Range Rover 92 rail will fit. However you have to cut and grind the back of the manifold quite a bit to fit the fuel pressure regulator.
2 I doubt whether the sensor suite would be compatable. While you could use the "Thor " fuel pump and the rail etc, as long as you just move across all the loom etc, the actual engine sensors should be OK. where you would have trouble would be VSS ( vehicle Speed sensor), and the control and feedback for the transmission if it is from an auto. Also , the ECM, talks to the BECM regarding the alarm etc.
Each ECM is coded to its speedo and alarm so will not work in another car.
Maybe these are able to be overcome, but I think it will cost a lot. The Brits say to get a new Defender ECM with The alarm disabled, as this does not have as many sensors.
The thermostat is completely different and in the bottom hose. Check that the radiator hoses are in the same place on the radiator.
I think the cheapest and easiest although probably not purest approach is to use the front off your engine with its distributor, use your 14CUX ,adapt the "Thor" manifold. You will lose the new style oil pump and the EDIS ignition.
You will also need a unichip to retune the mixtures to the "Thor " manifold, or go to an aftermarket system.
Engine mounts., exhaust are the same. Radiator hose layout is different with thermostat in lower hose. So if you want to revert to the old system, you have to have a thermostat housing mount machined in the front of the manifold.
All Rover blocks are backwards compatable. Ie you can hang all the old bits on a new block eg heasds, timing case , manifolds, engine mounts,flywheel/flexplate etc. ( although there is a dowel on the crank end which has to be cut off, and you have to fit a spacer if using the old front.)
Regards Philip A
The "Thor" injection runs at a higher pressure with a non return system. You could get around this by using your old 14CUX. However your Disco rail will not fit the Thor, but a Range Rover 92 rail will fit. However you have to cut and grind the back of the manifold quite a bit to fit the fuel pressure regulator.
2 I doubt whether the sensor suite would be compatable. While you could use the "Thor " fuel pump and the rail etc, as long as you just move across all the loom etc, the actual engine sensors should be OK. where you would have trouble would be VSS ( vehicle Speed sensor), and the control and feedback for the transmission if it is from an auto. Also , the ECM, talks to the BECM regarding the alarm etc.
Each ECM is coded to its speedo and alarm so will not work in another car.
Maybe these are able to be overcome, but I think it will cost a lot. The Brits say to get a new Defender ECM with The alarm disabled, as this does not have as many sensors.
The thermostat is completely different and in the bottom hose. Check that the radiator hoses are in the same place on the radiator.
I think the cheapest and easiest although probably not purest approach is to use the front off your engine with its distributor, use your 14CUX ,adapt the "Thor" manifold. You will lose the new style oil pump and the EDIS ignition.
You will also need a unichip to retune the mixtures to the "Thor " manifold, or go to an aftermarket system.
Engine mounts., exhaust are the same. Radiator hose layout is different with thermostat in lower hose. So if you want to revert to the old system, you have to have a thermostat housing mount machined in the front of the manifold.
All Rover blocks are backwards compatable. Ie you can hang all the old bits on a new block eg heasds, timing case , manifolds, engine mounts,flywheel/flexplate etc. ( although there is a dowel on the crank end which has to be cut off, and you have to fit a spacer if using the old front.)
Regards Philip A
Thanks for that effort. Seems like the gearbox and alarm coding of the speedo - instrumentation has me tricked. Changing the fuel pump / lines is OK. The wiring loom is a bit scary, but OK, having swapped a body shell on a S2 Disco before. I will have another look at the wiring diagram and associated info. Thanks again, Bundalene.
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