Defender Defender V8 Lexus queries - Page 2





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  1. #21
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    Default Re: Defender V8 Lexus queries

    Quote Originally Posted by jelo View Post
    OK Assuming the following:

    5 Speed Transmission Ratios (A650E)
    First = 3.357
    Second=2.150
    Third= 1.424
    Fourth= 1
    Fifth= 0.753

    Cruising speed = 120km/h

    1.4 Transfer case

    Standard 235/85-16 tyres @ 32 inches

    Standard 3.54 diffs

    That means you are only into your torque peak @ 160km/h in 5th, @ 120km/h in 4th, @90km/h in 3rd, @ 60km/h in 2nd, and @ 35km/h in 1st

    So you can barely run into 5th gear.

    4.7 : 1 diff ratios will in fact be close to perfect: 3900rpm in 5th @ 120km/h, and you'll hit the 6000rpm rev limit at 160km/h.

    Ashcroft does have a selection of heavy duty CW&P options.

    http://www.ashcroft-transmissions.co...g-pinions.html
    Gary above also says he thinks the 4.7 is better than the 3.54's
    Luke aka Jedi

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  3. #22
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    Default Re: Defender V8 Lexus queries

    Quote Originally Posted by JediNAfrica View Post
    Gary above also says he thinks the 4.7 is better than the 3.54's
    That's because Gary and I are clever
    2012 Jeep Sahara Unlimited 3.6 V6
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  5. #23
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    Default Re: Defender V8 Lexus queries

    Can we get the Ashcroft CW&P in South Africa or do I have to import?

  6. #24
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    Default Re: Defender V8 Lexus queries

    I should also mention I'm currently running 265/75R16's and somebody has suggested I go to a lower profile like 65 or 70 which may help - is there much merit in this?

  7. #25
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    Default Re: Defender V8 Lexus queries

    Quote Originally Posted by shauncooper View Post
    I should also mention I'm currently running 265/75R16's and somebody has suggested I go to a lower profile like 65 or 70 which may help - is there much merit in this?
    265/75-16 = 31.6 inches diam, 99.4 inch circimference

    Smaller than the stock which is 235/85-16

    To get a MEANINGFULL difference in revs (and that means a 30% decrease), you'd need to run 20 inch diameter tyres...........

    255/55-16 is still 26.4 inches..............83 inches circumference

    How stupid will THAT look?
    2012 Jeep Sahara Unlimited 3.6 V6
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  8. #26
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    Default Re: Defender V8 Lexus queries

    Ok thanks. So looks like my only feasible option is to try find some 4.7:1 diffs - any suggestions on where to get locally if Ashcroft is not available in SA?

  9. #27
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    Default Re: Defender V8 Lexus queries

    Quote Originally Posted by shauncooper View Post
    Ok thanks. So looks like my only feasible option is to try find some 4.7:1 diffs - any suggestions on where to get locally if Ashcroft is not available in SA?
    All Series Landies came with 4.7 in the Rover diffs

    Some Series 3 rear axles were Salisbury with 4.7 ratios

    You should be able to buy heavy duty items from any of the spares suppliers.
    2012 Jeep Sahara Unlimited 3.6 V6
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  10. #28
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    Default Re: Defender V8 Lexus queries

    With my old Pajero LWB lexus with Spitronics, with trailer and four kids, I got 7.5km/l going to Seweweekspoort last week, 4x4 and all. Cruising speed 95-110, revving 2400-2900rpm. Having researched the LS400 forums extensively, they seem to get best mileage at 65mph/104kph doing 2400rpm. My best to date was 9.3km/l doing 90-95kph (unladen), in town I get 5-6km/l. Verify that your Lambda sensor is working fine, this can mess your fuel computing around, especially on oem ecu.

    As for air filters, nice big donaldson should do the job, but ensure your housing is big enough, can breathe properly, and provide enough air.

    No idea on diff ratios for the Defender, but 2400-2600 should be ideal for cruising. If required, I drop a gear or two to overtake. I trust you can get it sorted easily enough!

    youtube clips

    Gen 2 2.8TDi, running with a Lexus heart since 290000kms
    - developed a drinking problem since - V8 inception 2014/03/28
    - looking up after some driver rehabilitation and fine tuning (5.5-8.7km/l) 2015/08/14
    - keep the wheels on the ground at all times - 2014/12/04
    - body maintenance completed -
    2015/02/19
    ------------------------------------------------------------------------------

  11. #29
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    Default Re: Defender V8 Lexus queries

    Quote Originally Posted by larry007 View Post
    With my old Pajero LWB lexus with Spitronics, with trailer and four kids, I got 7.5km/l going to Seweweekspoort last week, 4x4 and all. Cruising speed 95-110, revving 2400-2900rpm. Having researched the LS400 forums extensively, they seem to get best mileage at 65mph/104kph doing 2400rpm. My best to date was 9.3km/l doing 90-95kph (unladen), in town I get 5-6km/l. Verify that your Lambda sensor is working fine, this can mess your fuel computing around, especially on oem ecu.

    As for air filters, nice big donaldson should do the job, but ensure your housing is big enough, can breathe properly, and provide enough air.

    No idea on diff ratios for the Defender, but 2400-2600 should be ideal for cruising. If required, I drop a gear or two to overtake. I trust you can get it sorted easily enough!

    Larry I tend to agree with you. This is where we plan to be with my sons Hilux 2400 to 2600rpm at 120.

    I have spend many hours calculating ratios for the Lexus converssion.

    Before I would do a ratio change I rather would have cams cut to 4x4 profiles on the Lexus. This move the torque peak to a lower band.

    Both my 347 and 302 Rangers do 2200rpm @120. The 302 average around 6.5km/[email protected] on the open road.
    It is not what you buy its what you build.

  12. #30
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    Default Re: Defender V8 Lexus queries

    Quote Originally Posted by grips View Post
    Larry I tend to agree with you. This is where we plan to be with my sons Hilux 2400 to 2600rpm at 120.

    I have spend many hours calculating ratios for the Lexus converssion.

    Before I would do a ratio change I rather would have cams cut to 4x4 profiles on the Lexus. This move the torque peak to a lower band.

    Both my 347 and 302 Rangers do 2200rpm @120. The 302 average around 6.5km/[email protected] on the open road.
    Mr V8... Doing those cams will surely address the performance under 3000rpm. Everyone on this forum should up to date that the lexus is lazy under 3000rpm, I can attest to that. Not that I will attempt it, but I would like to know the outcome thereof.

    Having said that, the motor still surprises when doing slow stuff, like idling over rocks. I was obviously concerned about the 4x4 capabilities of the Lexus, but in turn I am pleasantly surprised and happy with it, it merely idles through - better than I could have hoped for!

    I suspect that cam will make a difference when pulling a laden trailer and you are stuck behind a truck uphill, easily cruising along, but then want to overtake. I have often found 4th at 80 (2800) doesn't have the oompth, and then drop it to 3rd to ensure a safe and quick overtake - with acceleration so glorious one forgets about the trailer... and this is with a baby v8 compared to yours...

    youtube clips

    Gen 2 2.8TDi, running with a Lexus heart since 290000kms
    - developed a drinking problem since - V8 inception 2014/03/28
    - looking up after some driver rehabilitation and fine tuning (5.5-8.7km/l) 2015/08/14
    - keep the wheels on the ground at all times - 2014/12/04
    - body maintenance completed -
    2015/02/19
    ------------------------------------------------------------------------------

  13. #31
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    Post Re: Defender V8 Lexus queries

    I run the R380 vs Lexus AE650 on the http://www.grimmjeeper.com/gears.html ratio calculator.

    Ratio of above mentioned boxes really close.

    Agree with Hagu13 if a Rover v8 can run those ratio`s a Lexus should do better.

    Me think the Lexus in this conversion is out of tune.
    It is not what you buy its what you build.

  14. #32
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    Default Re: Defender V8 Lexus queries

    Quote Originally Posted by jelo View Post
    I've always wanted a LexFender. Maybe one day..........
    Me too! 130 D.C. with steel rims, 33 inch tyres and a Lexus V8 / auto box is right near the top of the list.

    Want it to build it up myself though (I'd need a LOT of help haha)
    Andrew

    2010 Mazda BT-50 3.0 CRDi

  15. #33
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    Default Re: Defender V8 Lexus queries

    Quote Originally Posted by jelo View Post
    That's because Gary and I are clever
    Ja...that we be, the only difference is that you are still nice enough to explain the technicalities to them moegoes.....

    I just say what needs to be said....basta.

  16. #34
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    Default Re: Defender V8 Lexus queries

    Quote Originally Posted by GaryFrank View Post
    Ja...that we be, the only difference is that you are still nice enough to explain the technicalities to them moegoes.....

    I just say what needs to be said....basta.
    Sorry man this moegoe should not have never posted here.

    Think I have done more conversions than most of the posters here.

    It is fine this Moegoe will keep his mouth shut
    Last edited by grips; 2016/11/14 at 09:25 PM.
    It is not what you buy its what you build.

  17. #35
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    Default Re: Defender V8 Lexus queries

    I am willing to challenge any poster in this thread. Will buy a 110 Land Rover Defender and do a Lexus 1uz conversion. Will leave the diff`s with 3.54 ratios. Will do my mods and we can pit them against each other, economy and performance.

    Give me at least 24 months and we can arrange a forum shoot out.
    It is not what you buy its what you build.

  18. #36
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    Default Re: Defender V8 Lexus queries

    May I join ? ... as spectator of course
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  19. #37
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    Default Re: Defender V8 Lexus queries

    http://www.4x4community.co.za/forum/...t=#post3373094

    see post #63.......

    The OP was asking questions based on his findings.....we just answered based on our Lexus conversions and findings......

    Now tell me whats wrong with my 6,5lt GMC V8 diesel before I pop it into the 101
    Last edited by GaryFrank; 2016/11/14 at 10:18 PM.

  20. #38
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  21. #39
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    Default Re: Defender V8 Lexus queries

    Quote Originally Posted by grips View Post
    I am willing to challenge any poster in this thread. Will buy a 110 Land Rover Defender and do a Lexus 1uz conversion. Will leave the diff`s with 3.54 ratios. Will do my mods and we can pit them against each other, economy and performance.

    Give me at least 24 months and we can arrange a forum shoot out.
    Challenge accepted.....you do a Defender and I'll do the Longnose
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    Last edited by GaryFrank; 2016/11/14 at 10:22 PM.

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  23. #40
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    Default Re: Defender V8 Lexus queries

    Quote Originally Posted by Gaitshi Gubib View Post
    May I join ? ... as spectator of course
    AT your age ?.....pervert
    Last edited by GaryFrank; 2016/11/14 at 10:31 PM.

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