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Old 10-08-2017, 05:59 PM   #1
terryjm1
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Default 98 D1 V8 auto to 300TDI 5 speed conversion

I started this project before I truly understood the time commitment of marriage and a child. As such, it has taken 5 years to get this this point... I started the engine today for the first time but did so with some improvised wiring. After 5 years I just wanted to hear it run.

It is a rebuilt unit from Land Rover Import. It seems to run well, at least idling in the driveway.

For those of you that have done this conversion did you simply use applicable parts of the V8 harness or is it better to integrate the 300TDI harness. Ideally, I hope to find a plug under the glovebox that I can just plug the 300TDI harness into. I know, wishful thinking.

It is important to me to make a clean install no matter the route.
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Old 10-08-2017, 11:10 PM   #2
Leadvagas
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Default Re: 98 D1 V8 auto to 300TDI 5 speed conversion

I have a '95 5spd truck that a friend of mine and I did a 300TDI conversion in. We got the donor motor from a Disco with the 5spd as well. As far as wiring goes, the 300 just needs a starter and a hot with ignition on to open the shut down solenoid and glow plug timer. The wiring in my truck was pretty hacked up to begin with so I rewired for the alternator and starter using late model Ford as my model. I added an electric low pressure pump using the factory fuse for the old fuel pump as the power source, added electric rad fan using the ABS fuse as power and adding a thermostatic controller and manual on switch both through a relay. I have AC and used the factory condenser fans and switch in the coolant neck. I abandoned the following, cruise control (wiring burned up previous to 300), ABS, ECM, factory sound system. I added VDO temp gauge, oil pressure, volt meter, EGT, and manifold pressure gauge. The PO added D2 power seats that I am junking. My dream is to pull a D1 down to the shell and rewire it so that it makes sense and delete about 40% of what they came with. About the only parts of the V8 wiring you can use are, starter, alternator and AC. Most of that should just about hook up to the 300 components.
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Old 10-09-2017, 09:05 AM   #3
German Gruner
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Default Re: 98 D1 V8 auto to 300TDI 5 speed conversion

Hi, as my D1 is a LHD 300TDI, it can be a source of some information, so feel free to ask for pictures or details
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Old 10-09-2017, 01:19 PM   #4
terryjm1
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Default Re: 98 D1 V8 auto to 300TDI 5 speed conversion

Thanks for the replies!
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Old 10-24-2017, 04:09 PM   #5
ankeneering
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Default Re: 98 D1 V8 auto to 300TDI 5 speed conversion

"My dream is to pull a D1 down to the shell and rewire it so that it makes sense and delete about 40% of what they came with."
That's my dream with a p38 including the unobtanium manual transmission.
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Old 10-24-2017, 04:35 PM   #6
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Default Re: 98 D1 V8 auto to 300TDI 5 speed conversion

Quote:
Originally Posted by ankeneering View Post
That's my dream with a p38 including the unobtanium manual transmission.
Not unobtanium.

http://www.paddockspares.com/range-r...d-gearbox.html
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Old 10-24-2017, 07:21 PM   #7
terryjm1
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Default Re: 98 D1 V8 auto to 300TDI 5 speed conversion

UPDATE - I have made some good progress and have discovered I am missing part of the wiring harness from the V8 that sends power to the starter and a couple other things. I believe if I had that I would be wrapped up by now. Just determining it was missing took a lot of time.

However, Will Tillery is going to send me what I need. The guy has everything and his prices are very reasonable.

I have about 90% of the wiring squared away now and it is going to be nice clean looking factory installation.

Good lord these Disco are heavy on the wiring in the most unnecessary ways!! I had no idea when I started this project.
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Old 10-25-2017, 10:08 AM   #8
piper109
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Default Re: 98 D1 V8 auto to 300TDI 5 speed conversion

I did my 1999 Disco 1 SD conversion from V8 to 300tdi with 5 speed manual transmission back in 2010 and I don't remember all the electrical details particularly well. I do remember however that I used the existing V8 wiring and I just figured things out one at a time with a Fluke meter. Everything worked and still does, including a/c and cruise control and it was all fairly simple and uncomplicated. I use a two speed electric fan from a Volvo diesel car and control it with a temp switch from UK in the lower hose, switching on the fan full time in low speed for the a/c, with the stock a/c controls. I do not use the OBD.
I use an oil pressure gauge with 1/8" diameter plastic hose and on Shell Rotella T6, I see 52 psi on startup idle and about 15 psi idle when hot.

I live in the NC mountains and we get down below zero F at times so I ended up replacing the starter power cable with a larger copper section (close to 1/2" diameter) so the voltage drop was not as big in the quite long cable length round the back of the engine from the battery in the V8 front location, to the starter. The original cable would not turn the engine over fast enough in sub zero temps. Bosch starter is original.

I also designed my own adapter plate so I could mount the stock V8 a/c compressor sort of like its mounted on the 300tdi on the top of the timing case but I set it inline with the stock serpentine belt for water pump, alternator etc and I use a longer length Multi-vee belt. The stock 300tdi set up uses a second belt to drive the compressor from the crankshaft pulley but I had trouble getting those parts so I made my own set up. I just had two a/c hoses made as the V8 compressor is now in a different location. It works just fine and has for seven years now with stock wiring.

My original 60 amp italian Marelli alternator that came with the engine died so I use a 100 amp alternator from an early Saturn as it fits well in the same location and parts are easy to get and I fitted the pulley from the Marelli.
Cruise control uses the original vacuum actuator from the V8, adapted for the VE injector pump and works very nicely.

If you are interested in any of my mods, send me a PM. I get mileage in the mid 20's up here in the Blue Ridge. When i occasionally go down to lower parts, I can run in the high 70's on the interstate very comfortably.
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Old 10-25-2017, 07:22 PM   #9
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Default Re: 98 D1 V8 auto to 300TDI 5 speed conversion

Feel free to shoot me an email with any questions, I did this 2 years ago, with the r380 swap. Zack@Roversnorth.com
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Old 10-25-2017, 07:35 PM   #10
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Default Re: 98 D1 V8 auto to 300TDI 5 speed conversion

Here's one for you, Zack: how many hours did it take you to complete this job and what was the total cost of parts/shipping/special labor? If you don't mind sharing, of course.
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Old 10-25-2017, 07:55 PM   #11
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Default Re: 98 D1 V8 auto to 300TDI 5 speed conversion

Oh man! That's hard to say for sure. I did it over the course of maybe 8 months? Just when I was free really. There's almost no way I would have done it without a friend of mine Brandon moving to the area and being a huge help. A lot of the time I was waiting on random little parts to get in that were holding me up. I was replacing almost every part I could, 90% genuine parts, it got pricey. I probably spent around $10k including the engine/trans, which I got for pretty cheap. If I had every part I needed, and knew what I do now, I could probably do it in 2 weeks comfortably, possibly less. I'm not a quick, or skilled mechanic.
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Stu454: You'd have to be a barb-wire-shitting, full-fledged bad motherfucker to effectively use any handgun against a grizzly; especially in a defensive situation.

Save the last round for yourself. It'll be a blessed relief as the bear is wearing your guts as a hat.
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Old 10-26-2017, 09:01 AM   #12
terryjm1
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Default Re: 98 D1 V8 auto to 300TDI 5 speed conversion

I am quite interested in how you made the cruise control work. I have completely eliminated the FI ECU. Will that be a problem with the cruise control?
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Old 10-26-2017, 10:03 AM   #13
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Default Re: 98 D1 V8 auto to 300TDI 5 speed conversion

I really never use cruise control, I didn't bother trying to make it work in the diesel. There is an open spot on the injection pump to add another accelerator cable, which could be utilized for cruise control, or hand throttle.
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Stu454: You'd have to be a barb-wire-shitting, full-fledged bad motherfucker to effectively use any handgun against a grizzly; especially in a defensive situation.

Save the last round for yourself. It'll be a blessed relief as the bear is wearing your guts as a hat.
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Old 10-27-2017, 08:32 AM   #14
piper109
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Default Re: 98 D1 V8 auto to 300TDI 5 speed conversion

The cruise control has its own module and a small dedicated vacuum pump, not ECU controlled. I sent my module off to a specialist company and cleaned the trash out of the vacuum pump. It works well on an arm extension on the VE injector pump just like it did on the V8.
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