RRC V8 to 300tdi conversion





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  1. #1
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    Default RRC V8 to 300tdi conversion

    I am considering replacing my 1993 range rover classic V8 with a 300tdi mainly due to its fuel economy of 3-4km/l (careful driving) and emotional attachment to the car itself as its seldom driven of late.

    I would like to still drive the RRC for a couple of more years and prepare it for "overlanding". thus not considering just buying td5(however if cost are excessive in doing the conversion and fuel economy the same I would consider it.

    using a scrapped disco 1 is the engine a straight swap

    would I require swapping the gearbox aswell

    should I consider using the disco 1 harness
    the auto gearbox ( I would rather keep my current autobox)
    going spitronic route- I currently have a dictator fitted ad I think it adding to the fuel economy problem
    Wolverine : 93' Range Rover Classic 3.9L EFI

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    Default Re: RRC V8 to 300tdi conversion

    Quote Originally Posted by whosthejman View Post
    I am considering replacing my 1993 range rover classic V8 with a 300tdi mainly due to its fuel economy of 3-4km/l (careful driving) and emotional attachment to the car itself as its seldom driven of late.

    I would like to still drive the RRC for a couple of more years and prepare it for "overlanding". thus not considering just buying td5(however if cost are excessive in doing the conversion and fuel economy the same I would consider it.

    using a scrapped disco 1 is the engine a straight swap

    would I require swapping the gearbox aswell

    should I consider using the disco 1 harness
    the auto gearbox ( I would rather keep my current autobox)
    going spitronic route- I currently have a dictator fitted ad I think it adding to the fuel economy problem
    1) is the engine a straight swap: no, engine mounts are different, gearbox bellhousing doesn't match
    2) would I require swapping the gearbox aswell : see 1), the gearbox bellhousing differs between 300TDi and RV8
    3) should I consider using the disco 1 harness : no, the 300TDi basically needs 4 wires, all of which the RRC has
    4) the auto gearbox : yes, unless you get a R380 for the 300TDi
    5) Spitronic: WHAT FOR? The 300TDi has NO ECU
    Jakes Louw
    2012 Jeep Sahara Unlimited 3.6 V6
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  3. #3
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    Default Re: RRC V8 to 300tdi conversion

    First prize would be to find a Disco 1 TDi auto.
    Then it's a "straight" swap, with some cutting and welding.
    Also pay attention to the fuel system, as not all components are necessarily compatible between petrol and diesel. Like there should be no fuel pump on the diesel I guess? Line sizes, etc...
    But if you have a donour, I'd scavenge all of this along with the engine and gearbox.
    Also not sure what kind of auto box controls there are, but if any, use these from the Disco as well.

    There were a few RRC fitted with the 300TDi, I only saw one in SA, there a thread on this forum somewhere.

    Overall it sounds doable since neither are highly electronised machines.

    Good luck

    current: 02 Jeep Cherokee 2.8 CRD swap, and a camping trailer
    previous: 97 Pajero LWB 3.5 V6, 99 Pathfinder R50 3.3 V6, 98 Defender 90 300 TDi bakkie


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  5. #4
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    Default Re: RRC V8 to 300tdi conversion

    V8 fuel pump: you can leave that in as a lift pump for the mechanical diesel pump, but I'd put a fuel pressure regulator in of the RRC is EFI.

    Fuel return lines should be installed if not on the V8.

    As FF says, scavenge what you can from the D1.

    Best bet would be to take the RRC body off the chassis and drop it onto the D1 chassis........they are about 99% compatible as the D1 was based on the RRC.
    Jakes Louw
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    Default Re: RRC V8 to 300tdi conversion

    I think I remember being told the the axles on the RRC are better than those of the Defender (not sure where or why).
    Would the Disco's axles be the same as the RRC or the Defender?

    current: 02 Jeep Cherokee 2.8 CRD swap, and a camping trailer
    previous: 97 Pajero LWB 3.5 V6, 99 Pathfinder R50 3.3 V6, 98 Defender 90 300 TDi bakkie


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    Default Re: RRC V8 to 300tdi conversion

    Quote Originally Posted by Forest Fab View Post
    I think I remember being told the the axles on the RRC are better than those of the Defender (not sure where or why).
    Would the Disco's axles be the same as the RRC or the Defender?
    Yes the RRC axles were usually Salisbury rear but I think the early RRC front axle was a thick spline Rover axle.

    I'd inspect both sets and decide, but I'd keep the rear Salisbury.

    Also, the early RRC V8 had the early 4-speed ZF auto box, but the D1 300TDi had the R380 which was and is still is a decent manual box.
    Jakes Louw
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    Default Re: RRC V8 to 300tdi conversion

    Thanks all for the comments

    I am no expert however

    I as looking at the RAVE Manual and another RRC manual

    it came with a 300tdi motor exactly the same as the disco 1 thus I think there should be place for the engine mounts to just bolt into the chassis

    The only difference I see is the gearbox it being the 4 speed ZF gearbox RRC and disco 1 R380 however the RRC also came wit the R380

    however I think it should be able to work with the motor as one does get a disco 1 auto

    Is there some special adaptor plate to mount the ZF box to the tdi engine

    the transfer box is a Borg Warner on the RRC and LT230T on the discovery 1

    reason for using a different harness is the fuelling on my RRC is currently controlled by a dictator system so the current harness is cut
    Last edited by whosthejman; 2017/12/08 at 08:34 PM.
    Wolverine : 93' Range Rover Classic 3.9L EFI

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    Default Re: RRC V8 to 300tdi conversion

    Quote Originally Posted by whosthejman View Post
    however the RRC also came wit the R380
    I believe it was the LT77 box.
    Cheers,
    John Kilfoil

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  11. #9
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    Default Re: RRC V8 to 300tdi conversion

    Quote Originally Posted by JohnnoK View Post
    I believe it was the LT77 box.
    Then the rave manual is wrong
    Wolverine : 93' Range Rover Classic 3.9L EFI

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    Default Re: RRC V8 to 300tdi conversion

    My 81 Classic has a LT95 .... 4fwd, 1 reverse ....
    ... crude but tough and strong.

    Im interested in what you see as main advantages
    a 300tdi RRC will have over 300tDi disco 1...

    Is it the flex or generally tougher, stronger build ... or what ?
    Last edited by BushNomad; 2017/12/09 at 11:02 AM.
    ... Land Rover Owners dont idle long ...

    2002 Defender 130 DC HCPU. : Own the road...Any road
    1981 R-Rvr Classic 2-Dr 3.5L V8... The Greatest Rover.
    1975 Series3 88 PUP... Simply Classic...
    2017 Metalian Mini ... A Home from Home

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  13. #11
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    Default Re: RRC V8 to 300tdi conversion

    Borg Warner only on the P38 Rangie, and that was a left hand drop on the front diff propshaft flange.

    LT77 or LT77S on the RRC.

    I think you need to get underneath your RRC and actually take pics and compare those images to Interweb sources.
    Jakes Louw
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  15. #12
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    Default Re: RRC V8 to 300tdi conversion

    Quote Originally Posted by BushNomad View Post
    My 81 Classic has a LT95 .... 3fwd, 1 reverse ....
    ... crude but tough and strong.
    You've lost a gear

    LT95 is a 4 speed manual

    the 3spd auto was a Torqflite
    Jakes Louw
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    Default Re: RRC V8 to 300tdi conversion

    Yes ! My apologies, Jelo... Corrected now!
    ... Land Rover Owners dont idle long ...

    2002 Defender 130 DC HCPU. : Own the road...Any road
    1981 R-Rvr Classic 2-Dr 3.5L V8... The Greatest Rover.
    1975 Series3 88 PUP... Simply Classic...
    2017 Metalian Mini ... A Home from Home

    * The Monarch of the Glen *http://www.4x4community.co.za/forum/...1&d=1507751251

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  18. #14
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    Default Re: RRC V8 to 300tdi conversion

    Quote Originally Posted by whosthejman View Post
    I am considering replacing my 1993 range rover classic V8 with a 300tdi mainly due to its fuel economy of 3-4km/l (careful driving)
    There is something seriously wrong with the fuelling on your 3.9 EFIMy RRC regularly returned 5-5.5 km/l in town driving and 6.5 @ 125km/h.Car was A/T with allterrain tyres.
    Agree on the drive
    Last edited by DiscoFrans; 2017/12/09 at 11:10 AM.
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  20. #15
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    Default Re: RRC V8 to 300tdi conversion

    Quote Originally Posted by jelo View Post
    Borg Warner only on the P38 Rangie, and that was a left hand drop on the front diff propshaft flange.
    The Borg Warner transfer box with a mechanical high/low range shifter was introduced on the later Classics.
    L322 4.4 2011
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  22. #16
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    Default Re: RRC V8 to 300tdi conversion

    Quote Originally Posted by jelo View Post
    Borg Warner only on the P38 Rangie, and that was a left hand drop on the front diff propshaft flange.

    LT77 or LT77S on the RRC.

    I think you need to get underneath your RRC and actually take pics and compare those images to Interweb sources.
    I will do so and post some pics
    Wolverine : 93' Range Rover Classic 3.9L EFI

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    Default Re: RRC V8 to 300tdi conversion

    Quote Originally Posted by BushNomad View Post
    My 81 Classic has a LT95 .... 4fwd, 1 reverse ....
    ... crude but tough and strong.

    Im interested in what you see as main advantages
    a 300tdi RRC will have over 300tDi disco 1...

    Is it the flex or generally tougher, stronger build ... or what ?
    Fuel economy is the main advantage

    Yesterday a managed to average 4.5 on the open road pulling a moderately loaded trailer

    Nostalgia - i can count on my hand the number of other RRC ive seen simmilar to mine

    Lots of 3 door versions around though.
    Wolverine : 93' Range Rover Classic 3.9L EFI

  24. #18
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    Default Re: RRC V8 to 300tdi conversion

    Quote Originally Posted by DiscoFrans View Post
    There is something seriously wrong with the fuelling on your 3.9 EFIMy RRC regularly returned 5-5.5 km/l in town driving and 6.5 @ 125km/h.Car was A/T with allterrain tyres.
    Agree on the drive
    I agree its not tuned properly it has an aftermarket dictator system installed(bought it like it)
    The system is only running the fueling side of things
    There is no mass airflow sensor (adding to the problem)


    I managed to average 4.5 yesterday on the highway
    Wolverine : 93' Range Rover Classic 3.9L EFI

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    Default Re: RRC V8 to 300tdi conversion

    Before I go the Tdi route I will try to sort the fuelling on the v8.LRwit here on the forum is a guy with a lot of experiance with the Rover v8 fuelling and he is in Centurion.

    The Tdi route will be more expensive(I think) as the chances of getting a good running Tdi engine is not good.Fixing it can be costly.IIRC the Tdi in the RRC uses a different manifold than the D1.The auto Tdi has one injector that is electronic so you will need the ECU as well.

    Lots of things to think about!!

    Good luck!
    2012 RR TDV8 4.4
    2006 TDV6 SE A/T(Sold)
    2013 Bush Lapa Boskriek B142 met CKGR strepe
    2008 FL2 TD4 SE A/T
    1968 Renault 8 Gordini

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    Default Re: RRC V8 to 300tdi conversion

    I would rather sort the fueling issue. The RRC just feel better with the V8, diesel is for Toyotas
    I got a Spitronics fitted by a shop in Strand by the previous owners. On the trip to Sossusvlei we done around 6km/l (tarmac sitting at a good speed in SA, prefer not too mention how fast here) No air con, broken.

    On the Western Cape to Okovango we were just below 5, I fitted a roof rack, jerry cans on roof rack and roof top tent. Fully loaded, top speed came down to 145km/h and with the weight on the roof we were keeping it on 120km/h in South Africa. 5km/l included driving through Kgaligadi KAA gate, Kubu island and air con on full blast all the way.

    This is on a 1988 with LT77 5 speed manual and LT230 transer box (manual diff lock)
    Good choice of vehicle! We are planning a 1 year overlanding trip with ours in 18 months. Gullwing doors on rear windows for kitchen and shower, drawers, water tank, heat exchanger, drawers, etc.

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