Toyota 4.2D SAC Conversion





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  1. #1
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    Lightbulb Toyota 4.2D SAC Conversion

    Hi All,
    I'm looking for some advice/feedback. I have a Landcruiser 76 4.2D (45000km) and I'm considering the SAC Turbo/Intercooler conversion.
    I don't want to race, just be able to overtake with confidence and cruise comfortably at the speed limit without sucking too much extra fuel.
    Can anyone who has this conversion done give me some feedback on whether they think it was worth doing, what sort of improvement in drivability, and most importantly any problems experienced.

    All help and advice will be appreciated.

    Mike Meyer

  2. #2
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    Please not you will stuff up a very very reliable engine for life. You cannot make a Donkey run the July horse race even if you wipe it's ass with terps , it will drop dead before the race is over.
    Rather repower with a 24 valve 1HDFT 4.2diesel engine, factory fitted turbo or the 4.5 EFI petrol engine, also the most reliable engines out of the Toyota stable.
    The easiest is to trade for the V8 Cruiser 76.
    But wait and hear what the experts say.
    Cruiser 76 EFI 4.5 FullTime 4x4
    Cruiser 78 4.2 Diesel
    Cruiser 79 4.2 Diesel Full Time 4x4

  3. #3
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    Experts?

    Look at Jan's signature.
    LC 78 Troopie 1HD-FTE
    Uniglide
    +27 zero eight 2 four 95 9252

  4. #4
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    Jan wie is die ander experts?
    Johan Kriel

    LC's and Echo Chobe

  5. #5
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    Quote Originally Posted by JLK View Post
    Jan wie is die ander experts?
    Daar is baie Wannabees. Insluitende SAC...
    LC 78 Troopie 1HD-FTE
    Uniglide
    +27 zero eight 2 four 95 9252

  6. #6

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    1HZ bottom end is strong enough, but the pre-combustion head is not up to forced induction. I spoke to the main man at SAC PE, and even he said, if you are chasing reliability too, do not do the turbo or their head porting modification.
    We all have stories of good and bad ones....
    4x4 mate of mine did the most expensive turbo conversion on a low km 1HZ. Water to air intercooler, new all aluminium larger radiator, 3" exhaust, upgraded fan, new water pump.... and after the 3rd dyno tune, to tune for "reliability" (modest exhaust temps) instead of just power, she went bang in a big way.

    On my 1HZ I did a 6-2-1 branch with 2.5" free-flow, valve clearance, re-build injectors and a dyno tune with injector pump adjustment (modest exhaust temp).
    The result was a more free reving motor (no flat spots), gained maybe 1/2 a gear and improved economy. Good injectors are the best thing for the donkey motor.
    Patrol TB48
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  7. #7
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  8. #8
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    Ek is bevrees daar is geen manier om die R151 rattekas te versterk nie maar kan 'n modifikasie doen om sy lewe te verleng met 'n 1HZ dis al. Genoeg krag en hy is vlenters voor breakfast.
    Cruiser 76 EFI 4.5 FullTime 4x4
    Cruiser 78 4.2 Diesel
    Cruiser 79 4.2 Diesel Full Time 4x4

  9. #9
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    Don't do it Mike. Put that "jeuk" down And.Walk.Away.


    2011 Toyota Land Cruiser 76 S/W

  10. #10
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    Default Toyota 4.2D SAC Conversion

    I would never do anything to a Land Cruiser 70 series that HenriS & Black Jan say you should not do...

  11. #11
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    The pistons in the 1HZ are also too thin to take boost.

    My advice is to fit a 76 mm freeflow pipe and leave the donkey to do what it does best. Otherwise fit the 1HDFT. Or buy a V8 diesel Croozer. (What Swart Jan said)
    2016 BMW 535d

  12. #12
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    Quote Originally Posted by Henris View Post
    Daar is baie Wannabees. Insluitende SAC...
    that sounds a bit harsh.

  13. #13
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    Big big bad idea. Does not work plus that gearbox will not last. Just enjoy the 1HZ as it is, look at the flowers as you drive past and drive without the worry of collecting speed fines.

    Its only a problem in SA once you are over the borders topspeed is very low on the list of important stuff. Reliability, now that is what you should be looking for and you cannot beat a 1HZ for that.
    2012 Troopy
    Swambo Nissan Hardbody 3.0td 4x4

  14. #14

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    Quote Originally Posted by Riaanvdw View Post
    The pistons in the 1HZ are also too thin to take boost.

    My advice is to fit a 76 mm freeflow pipe and leave the donkey to do what it does best. Otherwise fit the 1HDFT. Or buy a V8 diesel Croozer. (What Swart Jan said)
    If the exhaust pipe diameter is too large, the flow velocity will fall and you loose some of the benefit you gained. 63 mm is believed to be the sweet-spot on the 1HZ
    Factory turbo Cruisers benefit from a 76 mm

    I have read a few reports (one of them was on this forum) about people dumping the mechanical fan, and some the fan and water pump, to replace it with electric fan/fans and EWP. They claim a usable increase in power, as the it takes less power to generate more Amps than the mechanical power loss. Also better cooling at lower speeds, and reduced heat-soak.
    It is just what I read, and no 1st hand experience. In theory I agree, but reliability of the replacement parts might be questionable...?
    Patrol TB48
    Patrol TD42T
    Ex-4x4-partners:
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  15. #15
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    Kiri, I am sure those mods would work, but the viscous is pretty efficient. Besides it will only kick in when the engine starts to labour. On the open road, it shold not even kick in.

    That EWP, I would not trust. Just something that will come back to bite you when you least expect it.

    On the exhaust, I would agree.
    LC 78 Troopie 1HD-FTE
    Uniglide
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  16. #16
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    SAC conversions have single handedly killed more 1HZ motors than any other cause.
    Think about it...
    To argue with a person that has renounced the use of reason is like administering medicine to the dead. ~ Thomas Paine

  17. #17
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    Thanks Guys,
    That sounds like a pretty convincing NO.

    Regards
    Mike

  18. #18
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    In my mind the only thing you must open the bonnit of a Cruiser with a 1HZ for, is to service it, keep it bog standard.

  19. #19
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    Wat stel julle mense voor? Ek het n 2010 diesel cruiser gekoop met SAC turbo op. Cruiser km is nou 135000. Ek het sover geen probleme nie ( het 30000 km gedoen by my ) Moet ek turbo laat afhaal of so aangaan. My v6 cruiser doen al die sleepwerk so die diesel loop net op plaas. So vir interressantheid op die ooppad teen 135km gem is die v6 cruiser ligter op brandstof. My petrol cruiser gee dan 6.2 km op n liter Diesel gee dan 5.8 km op n liter. Op plaas is petrol gem 5.5 km per liter en diesel 6.8 km per liter
    Molteno Boer
    Disco 5 2018
    Land Cruiser V 6 2012. Isuzu Club cab 4x4 2015

  20. #20
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    As jy n intercooler het en die EGT meet sal dit dalk beter gaan, maar op die plaas is die 1Hz net so koning, maak hom std. Hy het genoeg krag tot in sy 3e, en 4e, en op die plaas kom jy nie maklik daar nie.
    Johan Kriel

    LC's and Echo Chobe

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