My JeepLex conversion





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  1. #1
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    Default My JeepLex conversion

    First of all ...I do not know how to thank everybody that got involved with the raising of the funds to do this conversion. I will never be able to express in words how thankful me and my family are for what this COMMUNITY has done for us. THANK YOU!

    In the next month or two or three i will document the full extend of the conversion from a Diesel engine to the Lexus as well as all costs involved.
    Labour will be done by myself.

    This is the list of items that need to be done. If you feel i left something out then please shout.

    1. Lexus VVTI V8 Motor and gearbox Pre wired with original management system, complete with fuse box and OBD2 port R18150-00 Pd. Expect it later this week.

    2. 6 bar external Fuel pump R2000-00

    3. Gearbox to transfer-case adapter. CNC machined, Lazer aligned R7000-00

    4. Engine mountings E30 Bmw 320 mounts to be slightly converted

    5. I will be using a lot of the jeeps sensors in order to keep the functionality of the Jeeps cluster. Temp sensor, oil sensor etc.

    6.Radiator. I will keep the Jeeps Radiator as it is really big and should be more than enough to keep the V8 cool.

    7. The Lexus motor comes with a pump for the hydraulic fan that is standard on the jeep, so i will use that.

    8. Power steering ...will use pump on Lexus motor and just plum it in.

    9. I will keep the standard ECU in the jeep so there will be no functionality lost.

    10.Sump....The standard sump will not work, so i will fabricate a new sump with a rear bowl. I will also have to reroute and modify the oil pick up.
    I have already send the CAD drawings for the sumps base-plate to an engineering firm to cut it from 8mm mild steel. Once i receive the engine i will start with fabrication of the sump. Cost of Base-plate R350-00.

    11.Full service on the Gearbox and the V8 engine to be done including seals and timing belt.

    12. Exhaust.....will get quote . Might build custom headers......will see as soon as the engine arrives and i test fit it.

    13. Diffs. The gearing on the Lexus Autobox and the Nag1 gearbox in the Jeep is very close so the difs will stay standard. .
    This is the ratios......
    Transmission ratios Lexus 5 speed auto
    1 st 3,357
    2 nd 2,180
    3 rd 1,424
    4 th 1,000

    5 th 0,753

    Reverse gear 3,431


    Daimler-Benz 5G-Tronic W5A580
    Transmission type:
    automatic
    Number of gears:
    5
    Gear ratios (overall):
    I 3.588 (12.74)
    II 2.186 (7.76)
    III 1.405 (4.99)
    IV 1 (3.55)
    V 0.831 (2.95)

    R 3.167


    Sakkie van Staden
    Silver de Lange.2003 WJ Jeep..NOW powered by a 4L VVTI V8 Defy motor Forum Rebuild thread

    2004 Jeep Grand Cherokee 2.7 CRD Diesel power....4 inch Home build Long arm lift
    Past
    Jeep 3.1 Wj..AKA Turbo Esel (RIP)
    Man made it....Man Fix it.....
    I'm going to use all my tools, my God-given ability, and make the best life I can with it.
    LeBron James

  2. #2
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    Default

    Sakkie, from our conversations I can only add the following:

    Prop Shaft(s)


    What does the costing of your list above add up to ? According to my total in this post of the other fred, we are currently on R25k plus loose change.
    Last edited by ThysleRoux; 2015/12/07 at 12:34 PM.

  3. #3
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    Quote Originally Posted by ThysleRoux View Post
    Sakkie, from our conversations I can only add the following:

    Prop Shaft(s)


    What does the costing of your list above add up to ? According to my total in this post of the other fred, we are currently on R25k plus loose change.
    Thys acording to the engineering shop my props will remain the same. So i hold thumbs on that one.

    With all the parts so far the costs is R30k.
    Sakkie van Staden
    Silver de Lange.2003 WJ Jeep..NOW powered by a 4L VVTI V8 Defy motor Forum Rebuild thread

    2004 Jeep Grand Cherokee 2.7 CRD Diesel power....4 inch Home build Long arm lift
    Past
    Jeep 3.1 Wj..AKA Turbo Esel (RIP)
    Man made it....Man Fix it.....
    I'm going to use all my tools, my God-given ability, and make the best life I can with it.
    LeBron James

  4. #4
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    Default

    yup, I'd guess some propshafts might need to be made up depending on how the motor fits in the bay.

    big service for the new motor...

    plumbing items - Rad hoses, oil hoses, oil cooler hoses etc

  5. #5
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    Quote Originally Posted by Apocalypse View Post
    yup, I'd guess some propshafts might need to be made up depending on how the motor fits in the bay.

    big service for the new motor...

    plumbing items - Rad hoses, oil hoses, oil cooler hoses etc
    Very True Alex. Will only know for sure once the engine is test fitted.
    Thankfully i have a spare front and rear propshaft in perfect condition that i wanted to use when i would have lifted the Jeep.
    Sakkie van Staden
    Silver de Lange.2003 WJ Jeep..NOW powered by a 4L VVTI V8 Defy motor Forum Rebuild thread

    2004 Jeep Grand Cherokee 2.7 CRD Diesel power....4 inch Home build Long arm lift
    Past
    Jeep 3.1 Wj..AKA Turbo Esel (RIP)
    Man made it....Man Fix it.....
    I'm going to use all my tools, my God-given ability, and make the best life I can with it.
    LeBron James

  6. #6
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    Quote Originally Posted by Sakkie7 View Post
    Thys acording to the engineering shop my props will remain the same. So i hold thumbs on that one.

    With all the parts so far the costs is R30k.
    So my target of R35k in the other thread is about right, if you do not run into to many unforeseen issues.

    The offer to swing a spanner or 2 or pass on the beer, still stands, btw.

  7. #7
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  8. #8
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    don't forget the large bottle of cheap whiskey to consecrate this unholy union

  9. #9
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    Quote Originally Posted by ThysleRoux View Post

    The offer to swing a spanner or 2 or pass on the beer, still stands, btw.
    Yip, let us know when this happens. Always need a good excuse to leave civilization for a day trip into Sodom and Gomorrah.

    Last edited by Oppers; 2015/12/07 at 01:00 PM.
    Work. It's a wealthy man's privilege, and a poor man' fate....

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    "Boerbok" - 98 Jeep XJ 4lit auto
    "Gloria" - 04 Ranger D/C 4lit auto

  10. #10
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    Quote Originally Posted by Apocalypse View Post
    don't forget the large bottle of cheap whiskey to consecrate this unholy union
    Ja nee.....Like you said...there is a special place reserved for guys like us who do these unholy mods
    Sakkie van Staden
    Silver de Lange.2003 WJ Jeep..NOW powered by a 4L VVTI V8 Defy motor Forum Rebuild thread

    2004 Jeep Grand Cherokee 2.7 CRD Diesel power....4 inch Home build Long arm lift
    Past
    Jeep 3.1 Wj..AKA Turbo Esel (RIP)
    Man made it....Man Fix it.....
    I'm going to use all my tools, my God-given ability, and make the best life I can with it.
    LeBron James

  11. #11
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    Quote Originally Posted by Apocalypse View Post
    don't forget the large bottle of cheap whiskey 2SO to consecrate this unholy union
    Phixed !!
    Last edited by ThysleRoux; 2015/12/07 at 01:10 PM.

  12. #12
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    Sakkie I have found that car engine mounts seldom last on a 4x4.


    I have demolished standard 302 truck mounts ( the one`s with a re-enforced bolt going through it ) . You make considerable more torque in low range than in a car.


    I build my own semis solid mounts, yes a little more vibration is carried over but they are indestructible.


    The Lexus tends to overheat, don't just assume that radiator is big enough, it all depends on the cooling capacity of the radiator. You get big two cores being outperformed by small 4 cores.


    Successful Conversions is 80% planning and 20% doing. Rather spend time on research than re-doing things or solving problems once the vehicle is running.
    Attached Images Attached Images  
    Last edited by grips; 2015/12/07 at 01:31 PM.
    It is not what you buy its what you build.

  13. #13
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    Can't you with the same amount of trouble to make the 320 mounts fit, make the original engine mounts fit ?

  14. #14
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    With your decision to use the even higher geared Lexus Auto box vs. the already "Diesel" Biased ratios of the Jeep Drivetrain, are you not afraid the Lexus is going to rev to low ?

  15. #15
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    Looks like you got the 3UZ engine, not the 1UZ? Chances are that you current radiator will not do. The 2.7 jeep was good for 130 odd kw, the lexus is in the region of 200kw. That is a lot of extra potential heat for the current cooling system to handle.

    Someone else used a 4L bmw radiator (from a 540 or 740) on their conversion to avoid the overheating problem.

    Looking forward to the pictures and good luck.
    I thought I was wrong, but I was mistaken.

  16. #16
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    Sakkie, that thermostat housing is prone to break, somebody had an alloy or steel version that they were selling, it's worth looking at.

    And then as a precaution, have the starter motor pulled apart and checked because pulling that out if it fails means inlet manifold and injection fuel rail out.
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

  17. #17
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    Quote Originally Posted by Tanrack View Post
    Looks like you got the 3UZ engine, not the 1UZ? Chances are that you current radiator will not do. The 2.7 jeep was good for 130 odd kw, the lexus is in the region of 200kw. That is a lot of extra potential heat for the current cooling system to handle.

    Someone else used a 4L bmw radiator (from a 540 or 740) on their conversion to avoid the overheating problem.

    Looking forward to the pictures and good luck.

    I have only see one Lexus conversion not overheating in high ambient temp environments while doing dune driving and it had a custom build rad.


    I know most people go for the BMW rad but remember cars are not design
    to go slow for very long periods like a 4x4. Car rads are designed around lots of airflow at speed.
    It is not what you buy its what you build.

  18. #18
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    Quote Originally Posted by Tanrack View Post
    Looks like you got the 3UZ engine, not the 1UZ? Chances are that you current radiator will not do. The 2.7 jeep was good for 130 odd kw, the lexus is in the region of 200kw. That is a lot of extra potential heat for the current cooling system to handle.

    Someone else used a 4L bmw radiator (from a 540 or 740) on their conversion to avoid the overheating problem.

    Looking forward to the pictures and good luck.
    No you got two versions of the 1UZ, either non-VVTi or VVTi.
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

  19. #19
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  20. #20
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    Quote Originally Posted by MariusFourie View Post
    You can never have a cooling system too big for a big V8.



    It is not what you buy its what you build.

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