Putting a 4.6 V8 into my Disco

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pawksawd

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I've got hold of a rebuilt 4.6 with all the ancillaries, ecu and loom from a P38 HSE and I'm considering how to transplant it into my Disco.

The disco is running LPG so fueling should not be an issue (they use the same kit on P38s). I could convert it to use a dissy but I like the waterproof lost spark system of the 4.6.

OK the question I have is can I use the ecu from the P38?

I have heard that the err6645 ecu expects signals from the alarm system and thus without the rest of the p38 it might not run.
Is this true, and can I get around it without a complex chip change?

Are there any other problems?
 
If its going into your D1,it would help to know if its a UK spec car or whatever.If it is then forget the Gems or Thor EFI and use your 14Cux system,plus you will need the front cover and dizzy off the old engine.And the inlet manifold/injectors etc.
 
Hello,

If you wish to use a distributor you will require the "interim" timing cover from a later rover V8 with a distributor (e.g. TVR) because your new p38a engine has an oil pump that is driven directly of the nose of the crankshaft (much improved) whereas your old engine had a distributor shaft driven oil pump. The timing covers on your engines are not interchangeable.

I should point out that we specialise in distributorless engine managment systems for v8's so am slightly prejudiced...but it must be said that the wasted spark coil pack ignition system is aeons ahead of the old distributor as well as being truly waterproof with decent leads. The extra spark power of the coilpack system is ideal for your lpg setup.

Have you considered replacing the GEMS ecu with a programmable aftermarket alternative? There are many types available now that can be easily wired into your GEMS engine loom to provide fully programmable fuel and ignition timing. This technology is cheaper than ever and an entire programmable ecu is now available for the cost of a decent GEMS diagnostic and remap! These systems simplify the wiring and dispense with the restrictive airflow meter.

Most models now feature twin ignition/ fuel maps for petrol/ lpg operation that are simply activated from the existing lpg solenoid wiring. This can drastically improve lpg performance/ economy.

We have fitted this type of system to our own range rover with a 450 tvr rover v8. The fuel efficiency, throttle response, performance and driveability improvement over the 14cux system and stock dizzy is astounding!

Even if you retain your old 3.9 injection system you could use an ignition only ecu to control your coil pack ignition. The GEMS engine already has an ignition trigger wheel incorporated into the flywheel or flexplate so you would only need an ecu and wiring.

I hope this helps :)
 
drlloyd said:
Hello,

If you wish to use a distributor you will require the "interim" timing cover from a later rover V8 with a distributor (e.g. TVR) because your new p38a engine has an oil pump that is driven directly of the nose of the crankshaft (much improved) whereas your old engine had a distributor shaft driven oil pump. The timing covers on your engines are not interchangeable.

I should point out that we specialise in distributorless engine managment systems for v8's so am slightly prejudiced...but it must be said that the wasted spark coil pack ignition system is aeons ahead of the old distributor as well as being truly waterproof with decent leads. The extra spark power of the coilpack system is ideal for your lpg setup.

Have you considered replacing the GEMS ecu with a programmable aftermarket alternative? There are many types available now that can be easily wired into your GEMS engine loom to provide fully programmable fuel and ignition timing. This technology is cheaper than ever and an entire programmable ecu is now available for the cost of a decent GEMS diagnostic and remap! These systems simplify the wiring and dispense with the restrictive airflow meter.

Most models now feature twin ignition/ fuel maps for petrol/ lpg operation that are simply activated from the existing lpg solenoid wiring. This can drastically improve lpg performance/ economy.

We have fitted this type of system to our own range rover with a 450 tvr rover v8. The fuel efficiency, throttle response, performance and driveability improvement over the 14cux system and stock dizzy is astounding!

Even if you retain your old 3.9 injection system you could use an ignition only ecu to control your coil pack ignition. The GEMS engine already has an ignition trigger wheel incorporated into the flywheel or flexplate so you would only need an ecu and wiring.

I hope this helps :)
Click to expand...

Seems to me that this guy knows what he's talkin' about!:D
 
You need a MegaSquirt and Ford EDIS. As a starter for 10 go to www.extraefi.co.uk then flea bay, work on the premise that your loom is hot-wire then all you need to worry about is what engine sensors are in place on the 4.6 e.g coolant temp, air inlet temp and if you want to retain the existing stepper motor in which case you'll need a MS2 or if you're happy to bin it and use a Bosch valve instead that can be driven for a MS1.

PM me and I'll send you some more links for ideas.
 
With a P38A engine you will already have the distributor-less ignition system (i.e.: coil-packs, etc). You do not need the Ford EDIS system with any of our ECUs. They are all capable of driving the coil-packs directly from the ECU on an 8-cylinder with a wasted spark set-up, see Lloyd Specialist Developments | V4 mappable ECU for Rover V8 - fuel and ignition

These ECUs will also run stepper motor idle control if required. Full technical support is provided with this ECU.

Regards,
 
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