Defender Defender V8 Lexus queries





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  1. #1
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    Default Defender V8 Lexus queries

    Hi guys - we are busy completing the V8 Lexus conversion (with the Lexus auto-box) in my 2007 110 and I have a couple of queries:

    1) We are currently getting some pretty poor fuel consumption figures. Anybody out there who has done the conversion and can share some real world figures with me?

    2) Have you changed your diff ratio's and, if so, to what?

    3) I have a bit of a shudder on pull-off, have you experienced this?

    4) What air-filter setup are you running?

    Thanks.

  2. #2
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    Default Re: Defender V8 Lexus queries

    Average fuel consumption = 5km/l

    Have achieved 7.5km/l with light foot and no wind @ 100km/h.

    Pulls uphill @ 100km/h with half throttle, plenty power in reserve.
    It does lack torque, as the motor must be revved more compared to a diesel, and
    when that auto kicks down on an uphill, then it really wants to go.

    You don't really want to go more than 120km/h in a Defender, and with the V8
    uphills are no longer an issue, if i compare it to my 300Tdi.

    Shudder on pull away could be fuel related, more delivery to the pump from what
    i have experienced.

    The TC was stopped for a Disco1 V8's, don't expect a huge difference.

    If you don't drive like a yahoo, i think the diffs should be fine.
    Keep in mind, anything can be broken, if you try hard enough LOL.

    Swambo has a D90 with Lexus, auto, and Spittronix.
    There is now too much wiring, much more than i like in a Defender.
    1997 defender 90 300tdi
    2006 discovery 3 tdv6 S
    2010 polo vivo ( swambo )

    LROC - member since 2007

  3. #3
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    Default Re: Defender V8 Lexus queries

    Shaun, explain your opinion of poor fuel consumption.
    Jakes Louw
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

  4. #4
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    Default Re: Defender V8 Lexus queries

    Diff ratio is 3.54 on all coil sprung defenders and disco's if you have rover long nose Diffs front and back I think like the 90 and disco,you can get 2.78 crown wheel and pinions. the defender has rover long nose front and p38 or salsbary back and you can not get lower then 3.54 for the back or go 35" tires will help
    changing of the transfer case ratio gears from 1.44 to 1.22 and also get a 1.003 are your options
    and in my opinion I would not touch spitronics, you would be better off using the original Lexus ECU or go megasquirt 3

    my defender is running LS1 megasquirt ECU 4l80e auto and LT230 with 1.22 gears which I am changing next year to 1.003 and using 35" tires
    At 120 I want to do 1900 to 2000 RPM at moment doing around 2300
    Last edited by clivemd; 2016/11/10 at 06:06 PM.
    1995 300TDi Defender with VGT Turbo (stolen by my son now )
    2002 Defender with LS1 MS3 ECU, 4L80e, LT230 1.222, Lockers and HD CW&P, 35" with 4" Lift
    2005 Defender TD5

  5. #5
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    Default Re: Defender V8 Lexus queries

    I'd also stick to a front cut if I didn't have a Spitronics boffin close by.
    Jakes Louw
    2012 Jeep Sahara Unlimited 3.6 V6
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  6. #6
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    Default Re: Defender V8 Lexus queries

    Quote Originally Posted by jelo View Post
    I'd also stick to a front cut if I didn't have a Spitronics boffin close by.
    Is spitronics fully sequential or batch fire
    1995 300TDi Defender with VGT Turbo (stolen by my son now )
    2002 Defender with LS1 MS3 ECU, 4L80e, LT230 1.222, Lockers and HD CW&P, 35" with 4" Lift
    2005 Defender TD5

  7. #7
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    Default Re: Defender V8 Lexus queries

    Quote Originally Posted by clivemd View Post
    Is spitronics fully sequential or batch fire
    depends which one you buy

    The new Mercury2 can do sequential, batch sequential (paired cylinders) and standard batch, as well as individual coils.

    http://www.spitronics.com/products/i...wYTVnazE=+MTk1
    Jakes Louw
    2012 Jeep Sahara Unlimited 3.6 V6
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  8. #8
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    Default Re: Defender V8 Lexus queries

    MS3 the LS is run fully sequential,coil on plug and the ECU is controlling the fans and transmission oil cooler fan
    there is so much you can do with MS so happy with it
    1995 300TDi Defender with VGT Turbo (stolen by my son now )
    2002 Defender with LS1 MS3 ECU, 4L80e, LT230 1.222, Lockers and HD CW&P, 35" with 4" Lift
    2005 Defender TD5

  9. #9
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    Default Re: Defender V8 Lexus queries

    AFAIK the Lexus is a revvy motor and prefers the 4,7 ratio....

    max kW is at 6000rpm, max torque is at 4000rpm......no wonder why there's "economy" complaints.

    max economy is in the sweet spot (4000rpm), anywhere else and you may as well open the fuel tank drain plug....

    This was the problem with the Chev 4100. It gave a whopping 116kW at 1600rpm, go above 3000rpm and you're down to 2km/lt.
    Run in the sweet spot and you get 7km/lt.(okay, lets just say 70kph and get it over with)
    Last edited by GaryFrank; 2016/11/10 at 10:02 PM.

  10. #10
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    Default Re: Defender V8 Lexus queries

    the problem with the lexus v8 is it is a performance car engine. they used it in the lexus l2400 sedans. ratios were very close to the defender. difference is the car ran high revs as it cruised at high speed. where as offroad you are driving slow and the engine isn't in it's powerband. so increasing ratios shoud push theengine into higher revs at lower speed putting your vehicles in it's powerband sooner.
    Luke aka Jedi

    1954 Landy Rover Series 1 86"- Rambling Rose
    Best company slogan: Cherrybomb performance exhaust, Disturbing the peace since 1968



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    Default Re: Defender V8 Lexus queries

    I found that on my 110 with the 4.0 vvti lexus the best TC ratio to use is 1.4 and also 31 inch tyres. With the 1.2 ratio the engine struggled and you had to gear down for long uphills. I could however pull 100kmh in second gear hehe. That was nice for the odd robot race but not workable for towing. Fuel consumption was between 5 and 6.5 km per liter.

    You dont need to buy a frontcut anymore. Forget all these aftermarket computers. I have had endless crap with a certain well known and well loved computer. So much so that I removed the Lexus and stuck in a Isuzu. Go to turbotoys and buy the engine prewired with the original Lexus management. 6 wires to connect and you are good to go.

    You cannot compare a Chevy v8 to the Lexus. Its two different animals...
    Defender powered by Isuzu

  12. #12
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    Default Re: Defender V8 Lexus queries

    My Lexus is the 196kW one. Second generation non-VVTI

    I have 3.75 HD Ashcroft diffs- with ATBs- and a 1.21 Disco TC and 33" tyres. I transferred this lot over from my Disco 2 V8 (stock Rover 4.0) which was a lot heavier with less power. If I was doing it again I would keep the diff ratio at 3.54 or similar with the 1.21 TC as this combo could easily pull much higher gearing. I have added a lot of lightness to my 90 by removing all the rear seats etc and converting it to a bakkie, but even before I did that it felt like it could easily pull another gear. Consumption is all about gearing when you have excess power.

    I have it on good authority from someone running crazy power outputs (much bigger numbers than a Lexus) on a Defender in the dunes that 35s will break side shafts but power and torque don't really hurt them.

    I get 400km of mixed driving on 60l. With the Rover 3.9 on Spitronics and auto but with stock ratios I got 300km, so I'm very happy with consumption. Spitronics, tuned on a dyno.

    Shudder on pullaway might be mountings. Try to crowbar the passenger side engine mounting upwards as it is the first one to go.Various ways to strengthen mountings. Mine are boxed so they cannot flex enough to tear at max throttle but still work as normal under moderate load.

    I have a shrouded cone air filter which I have fitted in the fender behind the tail light as I drive sand.

    The Lexus is revvy and the curves are skewed towards the top end. But it is no dog when plodding. If you plot the curves on the same graph as the Rover 3.9. 4.0 and 4.6 motors it beats them everywhere. It just beats them more at the top.
    Last edited by Hagu13; 2016/11/11 at 09:56 AM.
    Rob
    Defender 90 pickup. Lexus V8, Spitronics, 33" KL71, beadlocks, +2" Terrafirma, ATB's, 3.75 CW&P, 1.21 TC.
    Series IIA 88" pickup
    Disco 2 ES TD5
    Disco 1 ES 300TDi
    Subaru impreza WRX
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  14. #13
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    Default Re: Defender V8 Lexus queries

    I've always wanted a LexFender. Maybe one day..........
    Jakes Louw
    2012 Jeep Sahara Unlimited 3.6 V6
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  15. #14
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    Default Re: Defender V8 Lexus queries

    With TC ratio of 1.211 fuel consumption was 6km/l driving for economy and just south of 130km/h (GPS)
    With double axle caravan driven hard but not above 100km/h achieved 5.5km/h. Important to note that I never used top gear (4000km). 3rd Gear ratio 90km/h @ 3000rpm.

    So I changed the TC gear ratio (Ashcroft) to 1.41 and must say the car is much more driveable even without the caravan.
    The Landy with 1.211 was geared for 150km @ 3000rpm.
    A LEXUS LS400 4 speed platkar will do 140km/h @ 3000rpm!!
    With the 1.41 TC my Landy will do 130km/h @ 3000rpm
    Defender 110 SW, Tyres 265/75/16(31.65), Diffs 3.54:1 TC 1.41 (was 1.211)
    Last edited by Wilk; 2016/11/11 at 12:41 PM.

  16. #15
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    Default Re: Defender V8 Lexus queries

    Quote Originally Posted by clivemd View Post
    MS3 the LS is run fully sequential,coil on plug and the ECU is controlling the fans and transmission oil cooler fan
    there is so much you can do with MS so happy with it
    Sorry to Hijack the thread, but where can I obtain MS system in SA, do I have to import?
    '03 Discovery II GS TD5

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    Default Re: Defender V8 Lexus queries

    Quote Originally Posted by Kingswood View Post
    Sorry to Hijack the thread, but where can I obtain MS system in SA, do I have to import?
    You have to import from DIYAutotune.com from the states
    1995 300TDi Defender with VGT Turbo (stolen by my son now )
    2002 Defender with LS1 MS3 ECU, 4L80e, LT230 1.222, Lockers and HD CW&P, 35" with 4" Lift
    2005 Defender TD5

  18. #17
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    Default Re: Defender V8 Lexus queries

    Thanks all for your replies. I'm currently only getting about 3.5 - 4km/l. My mechanic has done the conversion in his Colt and achieves an average of about 10km/l, so we estimated between 6-7km/l for the Defender due to the extra weight, permanent 4x4 and lack of aerodynamics.

    I have the 4.0 VVTi engine coupled with 5-speed Toyota/Lexus and standard ECU/TCU.

    im experiencing the same thing as CarloIsuzu in that I have to gear down for hills to maintain 100-120km/h even on slight inclines. I'm definitely inclined to thing gearing/diff ratios are not playing in my favor. Like Carlo says as well, can easily pull up to 90 in second and 125-140 in third, but 4th and 5th gears are like dogs.

    I should point out she is a heavy girl, on the scale around 2,950kg but I still expected better than 3.5km/l....

  19. #18
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    Default Re: Defender V8 Lexus queries

    Quote Originally Posted by shauncooper View Post
    Thanks all for your replies. I'm currently only getting about 3.5 - 4km/l. My mechanic has done the conversion in his Colt and achieves an average of about 10km/l, so we estimated between 6-7km/l for the Defender due to the extra weight, permanent 4x4 and lack of aerodynamics.

    I have the 4.0 VVTi engine coupled with 5-speed Toyota/Lexus and standard ECU/TCU.

    im experiencing the same thing as CarloIsuzu in that I have to gear down for hills to maintain 100-120km/h even on slight inclines. I'm definitely inclined to thing gearing/diff ratios are not playing in my favor. Like Carlo says as well, can easily pull up to 90 in second and 125-140 in third, but 4th and 5th gears are like dogs.

    I should point out she is a heavy girl, on the scale around 2,950kg but I still expected better than 3.5km/l....
    3 tons? Bloody heck.

    I think you need a set of Ashcroft crown wheel and pinion gears.

    Use their calculator to determine the optimum revs at your target speed.
    Jakes Louw
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

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    Default Re: Defender V8 Lexus queries

    considering the aeordynamics and vehicle weight i suspect your close to correct fuel economy. remember this engine is a hi rev car engine and not a torque motor. which means you have to rev the mootor more to get it to move than a stock v8 defender and the higher the revs the more it drinks. you definitely need to think regearing to bring vehicle into powerband sooner to make up for the low torque. it will still drink but you should improve performance and wear on engine.
    Luke aka Jedi

    1954 Landy Rover Series 1 86"- Rambling Rose
    Best company slogan: Cherrybomb performance exhaust, Disturbing the peace since 1968



  21. #20
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    Default Re: Defender V8 Lexus queries

    Quote Originally Posted by JediNAfrica View Post
    considering the aeordynamics and vehicle weight i suspect your close to correct fuel economy. remember this engine is a hi rev car engine and not a torque motor. which means you have to rev the mootor more to get it to move than a stock v8 defender and the higher the revs the more it drinks. you definitely need to think regearing to bring vehicle into powerband sooner to make up for the low torque. it will still drink but you should improve performance and wear on engine.
    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
    Jakes Louw
    2012 Jeep Sahara Unlimited 3.6 V6
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