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  1. #41
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    Default Re: RRC V8 to 300tdi conversion

    I don't think you'd be able to run 35s under a RRC without major surgery anyway.

    An Ashcroft ratio change would indeed be needed, and while you're there, heavy duty CW&P as well as an Ashcroft locker but we're WAY off track...........
    2012 Jeep Sahara Unlimited 3.6 V6
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  2. #42
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    Default Re: RRC V8 to 300tdi conversion

    Dont butcher the RRC, rather sell it and buy a D1 Tdi.
    2006 VW Touareg 4.2 V8 Auto
    2000 Disco 2 GS 4.6 V8 Auto
    2013 Wildebeest Kalfie Boswa 8)
    2002 Audi S6 4.2 V8 quattro

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  3. #43
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    Default Re: RRC V8 to 300tdi conversion

    Quote Originally Posted by TwinDisco View Post
    Dont butcher the RRC, rather sell it and buy a D1 Tdi.
    this is the best option
    2012 Jeep Sahara Unlimited 3.6 V6
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  4. #44
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    Default Re: RRC V8 to 300tdi conversion

    Best is just to have the Dictator sorted and tuned. You can drive very far with the money saved by not doing the conversion.

    If you don`t want to do it, can I have the Dictator for my build?

  5. #45
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    Default Re: RRC V8 to 300tdi conversion

    Quote Originally Posted by TwinDisco View Post
    Dont butcher the RRC, rather sell it and buy a D1 Tdi.
    Its not butchering its changing it to an engine that actually came out in this model of car

    However one didn't see the diesel as often as the RR brand is of higher luxury and if you can afford it you could surely afford the fuel bill that comes with it- applicable in todays market as well just look at the pricing.

    I will NEVER sell my RRC - even though I have contemplated this a number of times(having a love hate relationship) hence the conversion option as its already been modified I feel it has semi lost its patina :

    The day of purchase the car it was modified as follows
    • airbags removed & changed to spring system
    • Dictator system fitted
    • ABR rear diff locker
    • MAS removed cone air filter fitted


    what I have changed
    inside loadbin carpet removed changed to conveyer belt rubber mat
    rear bumper - after somebody drove into me it bent the mild steel bumper a bit
    damages included right rear lens, bumper bent, some small patina scratches.

    front bumper - as per the rear bumper I do not want any more damage to come to the car thus I feel the need to fit
    a "taxi frame blender " to match the rear bumper.(still to fit)

    - I will keep all the parts I remove as when the day comes and I feel i have had enough of the "conversion" I would have the option to change it back

    I have contemplated keeping the RRC the same and buying the D1/2 however the problem then becomes the number of cars one owns. I own currently only 3 but it was 5 a couple of months ago and I prefer to reduce this number however when it comes to a land rover "what is one more project?"
    Wolverine : 93' Range Rover Classic 3.9L EFI

  6. #46
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    Default Re: RRC V8 to 300tdi conversion

    Quote Originally Posted by grips View Post
    With that I agree. My experience with the well over 20 conversions i have done is you so not fix ratios to satisfaction with tyres.

    I would only run 35`s if there is more than 200kw and 500nm available

    I am planning on keeping the RRC standard mags with mybe a increased sidewall height

    I do not think ratios etc. would be a problem as the 300tdi engine came in my model the only thing that is different (and I stand to be corrected) is the transfer box.

    everything else was the same (per the "rave manual" and "another RRC manual")

    however this is a Landover and in the past they when they were changing models they interchanged parts.
    Wolverine : 93' Range Rover Classic 3.9L EFI

  7. #47
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    Default Re: RRC V8 to 300tdi conversion

    Quote Originally Posted by grips View Post
    With that I agree. My experience with the well over 20 conversions i have done is you so not fix ratios to satisfaction with tyres.

    I would only run 35`s if there is more than 200kw and 500nm available
    Not to be argumentative, but it's all about wheel (ground) speed VS engine speed. You can achieve the same overall ratio by changing your gearbox ratios (not doable on an OEM box), your transfer case, diffs ratios and tyres size.
    The only difference with bigger tyres is the added unsprung and rotating weight. But ratio-wise, you can achieve the same. Or am I missing something?

    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


  8. #48
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    Default Re: RRC V8 to 300tdi conversion

    Quote Originally Posted by andre` View Post
    Best is just to have the Dictator sorted and tuned. You can drive very far with the money saved by not doing the conversion.

    If you don`t want to do it, can I have the Dictator for my build?
    sorting out the fueling is my first option however if I buy a secondhand MAS where I think my problem is its +- R1000? (does anybody have one for free)

    it might bring the fuel economy up to say 6l/km

    taking a hypothetical trip of approximately 5000km @ R14.50 per/l for 95 as that what the car likes and best economy is returned on this fuel (please do not debate 93 vs 95), a loaded car, and driving the speed limit as I am currently limited to that in any case

    @4.5l/km = R16111 current
    @ 6l/km? = R12083 dictator sorted out excluding the cash spent on fixing it
    @ 8l/km = R9062 - expected from doing the conversion(is this optimistic?)
    @ 10l/km = R7250 - from defender figures(earlier post)

    cost of secondhand car + any bits required on engine = R30k? I would be doing most of the work myself with the helpful of advise hopefully of forumumites

    Thus number of trips I can achieve on a 30k fuel budget

    @4.5l/km = 1.8 TRIPS - not doing the conversion
    @ 6l/km = 2.4 TRIPS - fixing the dictator - (hopeful of this figure)

    The number of trips I can achieve on the fuel saving (16k- initial fuel spend)

    @ 8l/km = 0.7 TRIPS - on the saving of R7049
    @ 10l/km = 1.2 TRIPS - on the saving of R 8750

    The number of trips I need to do before breaking even on the 30k budget(30k / fuel saving)

    @ 8l/km = 4.2 TRIPS (or 21000km)
    @ 10l/km = 3.4 TRIPS (or 17000km)

    thus to me it makes sense to do the conversion as in the long run one would be saving when doing these longer trips
    Last edited by whosthejman; 2017/12/12 at 02:24 PM. Reason: calculations confusing simplified explanation
    Wolverine : 93' Range Rover Classic 3.9L EFI

  9. #49
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    Default Re: RRC V8 to 300tdi conversion

    Quote Originally Posted by Forest Fab View Post
    Not to be argumentative, but it's all about wheel (ground) speed VS engine speed. You can achieve the same overall ratio by changing your gearbox ratios (not doable on an OEM box), your transfer case, diffs ratios and tyres size.
    The only difference with bigger tyres is the added unsprung and rotating weight. But ratio-wise, you can achieve the same. Or am I missing something?

    Have some fun with this

    http://www.grimmjeeper.com/gears.html
    It is not what you buy its what you build.

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  11. #50
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    Default Re: RRC V8 to 300tdi conversion

    This is the recognised best Land Rover ratio tool:

    http://www.ashcroft-transmissions.co...atio_calc.html
    2012 Jeep Sahara Unlimited 3.6 V6
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  13. #51
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    Default Re: RRC V8 to 300tdi conversion

    Quote Originally Posted by grips View Post
    Thanks, I know how to calculate ratios Hence my previous question

    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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  15. #52
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    Default Re: RRC V8 to 300tdi conversion

    Quote Originally Posted by Forest Fab View Post
    Thanks, I know how to calculate ratios Hence my previous question
    I wanted to be easy on you

    Very few 4x4`s can accommodate 35`s without fender and suspension mods.

    Example 31 Inch tires with 3.9 diff and 0.88 5th will rum at 2770 rpm at 120km/h


    33`s with above ratios will see you at 2606 rmp @ 120. Not a huge saving.


    31`s 3.5 diff with 0.88 5th will give 2489 rpm at 120.

    You need to fit 35`s to equal that.

    Then if you lower the 5th gear ratio to 0.736 with 31`s and 3.9 diff you do 2330 @ 120.

    Now my question how many conversion builds did you do where you did ratio changes. I have done my fair share.
    Even did gear set changes on gearboxes. My latest is a 5th gear mod on a R151 for the Lexus Lux.

    Have ordered a Toyota 2nd and 5th gear set for the V8 76 Cruiser to be done early next year. Tires,diff and transfer ratio changes affects all gear ratios. There are reasons why I prefer overdrive ratios.

    Yes We do have 4x4`s with 35`s. I have done 33 to 35 upgrades but that is on a 4x4 with 230kw and 500nm. I sport 35`s a gear splitter overdrive on my Yank Ranger. Doing 2200rpm at 120 but have a 300kw 600nm 347 v8 to back that up.

    I try to help people to stay away from pitfalls in conversions and builds.
    Last edited by grips; 2017/12/12 at 06:29 PM.
    It is not what you buy its what you build.

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  17. #53
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    Default Re: RRC V8 to 300tdi conversion

    Im driving a D1 300 tdi. If I were you spend a little more and get the extra Disco if you have the space.

    I'm getting around 9.4l/100km.

    If not I would get the RRC to an expert and aim for your 15l/100km odd.

    My car is my daily but I do 50 km a day or less on average. Unless it's your daily driver is it really worth saving R5k on a once so often trip?
    Last edited by MickeyBlue42; 2017/12/12 at 05:35 PM.
    1997 Discovery 1 300tdi - Pussy Galore
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  19. #54
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    Default Re: RRC V8 to 300tdi conversion

    Isnt The Disco 1 chassis practically the same as a RRC chassis (esp latter ones)
    .... and steering ... and suspension etc
    Disco 1 was conceptually an evolved version of earlier Range Rover with modified body
    and furnishings and choice of engines ...

    so if you are moving away from the hungry V8 ...
    why not rather accept and settle for standard purpose-designed Disco 1 TDI ?
    * The Monarch of the Glen *http://www.4x4community.co.za/forum/...1&d=1507751251
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    2002 130 DC HCPU //81 R-Rvr Classic 2-Dr 3.5L V8.
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  21. #55
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    Default Re: RRC V8 to 300tdi conversion

    Quote Originally Posted by BushNomad View Post
    Isnt The Disco 1 chassis practically the same as a RRC chassis (esp latter ones)
    .... and steering ... and suspension etc
    Disco 1 was conceptually an evolved version of earlier Range Rover with modified body
    and furnishings and choice of engines ...

    so if you are moving away from the hungry V8 ...
    why not rather accept and settle for standard purpose-designed Disco 1 TDI ?
    As i have a emotional /sentimental attachment to the car and would rather try improve than replace

    The disco 1 was modeled on the rrc chassie however in my opinion not a better car

    Its a diffrent body on the same chassi
    The engines are exactly the same in both the rrc and disco 1 for the peterol and diesel talking about the efi versions

    Only difference is the disco 1s tranfer case and 7 seater version

    Off topic

    I can easily go out and buy a bakkie and pay a monly premium
    Our current Society is focused on replacements as cars are only built to last a limeted number of years befor you are conned into a finance conned-track

    Landrover was born as a fix it yourself car that a lyman can fix with basic mechanical knowlage and bush tools

    Thus in the true spirit of landrovering i would rather improve than replace
    Last edited by whosthejman; 2017/12/12 at 07:18 PM.
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  22. #56
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    Default Re: RRC V8 to 300tdi conversion

    Quote Originally Posted by MickeyBlue42 View Post
    Im driving a D1 300 tdi. If I were you spend a little more and get the extra Disco if you have the space.

    I'm getting around 9.4l/100km.

    If not I would get the RRC to an expert and aim for your 15l/100km odd.

    My car is my daily but I do 50 km a day or less on average. Unless it's your daily driver is it really worth saving R5k on a once so often trip?
    9.4 is amazing!!

    I would make it my daily drive at that km/l

    I would gladly take that

    Im not aming for 15km/100 i think thats wishfull thinking in any landrover

    If you look at my calculations i would get it back after only doing +- 17000km

    Worth it ? Yes
    Wolverine : 93' Range Rover Classic 3.9L EFI

  23. #57
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    Default Re: RRC V8 to 300tdi conversion

    Quote Originally Posted by grips View Post
    I wanted to be easy on you

    Very few 4x4`s can accommodate 35`s without fender and suspension mods.

    Example 31 Inch tires with 3.9 diff and 0.88 5th will rum at 2770 rpm at 120km/h


    33`s with above ratios will see you at 2606 rmp @ 120. Not a huge saving.


    31`s 3.5 diff with 0.88 5th will give 2489 rpm at 120.

    You need to fit 35`s to equal that.

    Then if you lower the 5th gear ratio to 0.736 with 31`s and 3.9 diff you do 2330 @ 120.

    Now my question how many conversion builds did you do where you did ratio changes. I have done my fair share.
    Even did gear set changes on gearboxes. My latest is a 5th gear mod on a R151 for the Lexus Lux.

    Have ordered a Toyota 2nd and 5th gear set for the V8 76 Cruiser to be done early next year. Tires,diff and transfer ratio changes affects all gear ratios. There are reasons why I prefer overdrive ratios.

    Yes We do have 4x4`s with 35`s. I have done 33 to 35 upgrades but that is on a 4x4 with 230kw and 500nm. I sport 35`s a gear splitter overdrive on my Yank Ranger. Doing 2200rpm at 120 but have a 300kw 600nm 347 v8 to back that up.

    I try to help people to stay away from pitfalls in conversions and builds.
    Thanks for the info i havent looked at it like that and i will definitly consider it. However give the fact that both the rrc and disco 1 are exactly the same car with a diffrent body on top i think things would still remain the same ratio as its the same dif, axels and gearbox in both the cars rrc and disco with both standard wheels and standard tires the only diffrence will be the transfer box(to be confirmed)
    Wolverine : 93' Range Rover Classic 3.9L EFI

  24. #58
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    Default Re: RRC V8 to 300tdi conversion

    I think this forum served its purpose!
    i thank all for the input
    I would like to close this thread

    I am starting a new post

    project ROVERINE (RRC overland preperation) focusing on preparing and repairing the car for a namibian botswana trip and hopefully engine conversion in the new year- after pink foot has arrived
    Wolverine : 93' Range Rover Classic 3.9L EFI

  25. #59
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    Default Re: RRC V8 to 300tdi conversion

    Quote Originally Posted by grips View Post
    I wanted to be easy on you

    Very few 4x4`s can accommodate 35`s without fender and suspension mods.

    Example 31 Inch tires with 3.9 diff and 0.88 5th will rum at 2770 rpm at 120km/h


    33`s with above ratios will see you at 2606 rmp @ 120. Not a huge saving.


    31`s 3.5 diff with 0.88 5th will give 2489 rpm at 120.

    You need to fit 35`s to equal that.

    Then if you lower the 5th gear ratio to 0.736 with 31`s and 3.9 diff you do 2330 @ 120.

    Now my question how many conversion builds did you do where you did ratio changes. I have done my fair share.
    Even did gear set changes on gearboxes. My latest is a 5th gear mod on a R151 for the Lexus Lux.

    Have ordered a Toyota 2nd and 5th gear set for the V8 76 Cruiser to be done early next year. Tires,diff and transfer ratio changes affects all gear ratios. There are reasons why I prefer overdrive ratios.

    Yes We do have 4x4`s with 35`s. I have done 33 to 35 upgrades but that is on a 4x4 with 230kw and 500nm. I sport 35`s a gear splitter overdrive on my Yank Ranger. Doing 2200rpm at 120 but have a 300kw 600nm 347 v8 to back that up.

    I try to help people to stay away from pitfalls in conversions and builds.
    Grips, I think you misunderstood me...
    The point I was trying to make is that tyre size will modify your overall drive train ratio too.
    After re-reading your posts, you seem to say that to achieve the correct RPM in the OP's case, he's need to go to 35"? If so, yes, it creates other challenges. But that wasn't my point.
    And no, I haven't done any substantial conversions, but it doesn't mean or prove anything. After all you've done 20 and you're here to warn of the pitfalls? It took you some time! (tongue in cheek obviously )

    To the OP, I'll follow your other thread, or why not continue here?
    I can understand your motivation and wish you the best of luck.
    Like grips infered, it's never as easy as what you thought, plan to go over budget and past your deadlines

    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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  27. #60
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    Default Re: RRC V8 to 300tdi conversion

    Quote Originally Posted by Forest Fab View Post
    Grips, I think you misunderstood me...
    The point I was trying to make is that tyre size will modify your overall drive train ratio too.
    After re-reading your posts, you seem to say that to achieve the correct RPM in the OP's case, he's need to go to 35"? If so, yes, it creates other challenges. But that wasn't my point.
    And no, I haven't done any substantial conversions, but it doesn't mean or prove anything. After all you've done 20 and you're here to warn of the pitfalls? It took you some time! (tongue in cheek obviously )

    To the OP, I'll follow your other thread, or why not continue here?
    I can understand your motivation and wish you the best of luck.
    Like grips infered, it's never as easy as what you thought, plan to go over budget and past your deadlines
    Ok seems we missed each other. No harm meant. My reference to 35`s were only to show how much tire increase is needed to be affective.

    Believe me it is hard to find the perfect gear ratios for conversions when you start bringing in power and torque calculations. What sometimes seems perfect on paper is not that perfect in practice.

    As I am not a Landy boffin I only tried to alert the OP that a diesel to petrol conversions might have some ratio issues.

    To the OP sorryfor the hi-jack.
    It is not what you buy its what you build.

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