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  1. #1
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    Default Improving performance of 1hz 4.2d toyota engine

    Would a free flow exhaust and branches help, there is also talk of egr blockoff? Any ideas pse ?

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    Default Re: Improving performance of 1hz 4.2d toyota engine

    The only reliable way of improving a 1HZ's performance is to trade it in on a V8 (said slightly tongue in cheek). Don't waste your money on the rest.

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    Default Re: Improving performance of 1hz 4.2d toyota engine

    Quote Originally Posted by RobH View Post
    The only reliable way of improving a 1HZ's performance is to trade it in on a V8 (said slightly tongue in cheek). Don't waste your money on the rest.
    100%

    Or else buy a 1HD-T engine and put that in.

    The 1HZ is what it is.
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    Default Re: Improving performance of 1hz 4.2d toyota engine

    I strongly doubt the 1HZ has EGR.

    The exhaust won't make much of a difference, maybe sound better. That's it. It's a donkey and should just be left to donkey on.
    2016 BMW 535d

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    Default Re: Improving performance of 1hz 4.2d toyota engine

    If my memory does not fail me one of the last projects Andrew St Pierre White tackled before he emigrated was to turbocharge a Troopy. He had to replace the pistons though, because the standard pistons could not handle boost. He was very happy with the end result.
    *
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    Default Re: Improving performance of 1hz 4.2d toyota engine

    Quote Originally Posted by Poen View Post
    If my memory does not fail me one of the last projects Andrew St Pierre White tackled before he emigrated was to turbocharge a Troopy. He had to replace the pistons though, because the standard pistons could not handle boost. He was very happy with the end result.
    he stole the idea from the Ozzies

    AStPW had very few ideas of his own IMHO.
    Jakes Louw
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    Default Re: Improving performance of 1hz 4.2d toyota engine

    The 1 HZ is a bit of a misunderstood engine by many. Because it can run on just about anything and lasts long if looked after, people think it is just a piece of cast iron. Yes compared to current diesels it is an old design, but it still is not so straight forward to work on.

    Two things on the 1HZ are absolutely critical for performance, valve clearance and pump timing.

    Becasue the valve clearance is set through shimming, not people have the skill and/or time and /or tools and/or parts to set this properly.

    The same goes for the pump timing. Half a degree makes a huge difference on a 1 HZ. It goes without saying that pump and injector calibration is also of the utmost importance.

    One of the specialists in 1HZ is Brandwacht Diesel in Worcester +27 23 342 1664. They have gone as far as developing an adjustable timing gear for the 1 HZ to be absolutely sure about the timing, with one tooth on the belt sometimes being too much. Speak to jan Burger.

    A freeflow exhaust and headers do help.

    An yes the 1HZ has had ab EGR valve for at least the last 5 years

    I have driven 1HZ's that will run up and downhill without touch a gearlever ad they were only well tuned. No turbos or funny changes.
    Last edited by Francois Theron; 2016/11/30 at 10:03 AM.
    There is never a right time to do the wrong thing and never a wrong time to do the right thing!

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    Default Re: Improving performance of 1hz 4.2d toyota engine

    Usually, you buy the 1HZ motor for reliability and not performance. I would consider that the engine was designed for exactly that, reliability. If you modify it to give more power, you reduce reliability and then what was the purpose of starting with a 1HZ ? Buy a race horse in the beginning and dont try to turn a donkey into one.

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    Default Re: Improving performance of 1hz 4.2d toyota engine

    Quote Originally Posted by Francois Theron View Post
    The 1 HZ is a bit of a misunderstood engine by many. Because it can run on just about anything and lasts long if looked after, people think it is just a piece of cast iron. Yes compared to current diesels it is an old design, but it still is not so straight forward to work on.

    Two things on the 1HZ are absolutely critical for performance, valve clearance and pump timing.

    Becasue the valve clearance is set through shimming, not people have the skill and/or time and /or tools and/or parts to set this properly.

    The same goes for the pump timing. Half a degree makes a huge difference on a 1 HZ. It goes without saying that pump and injector calibration is also of the utmost importance.

    One of the specialists in 1HZ is Brandwacht Diesel in Worcester +27 23 342 1664. They have gone as far as developing an adjustable timing gear for the 1 HZ to be absolutely sure about the timing, with one tooth on the belt sometimes being too much. Speak to jan Burger.

    A freeflow exhaust and headers do help.

    An yes the 1HZ has had ab EGR valve for at least the last 5 years

    I have driven 1HZ's that will run up and downhill without touch a gearlever ad they were only well tuned. No turbos or funny changes.
    ...THANKS, very VERY helpful post!!
    "Yes, I have a Bad Habit. I take Tea at Three".........Mick Jagger

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    Default Re: Improving performance of 1hz 4.2d toyota engine

    @Francois Theron, ek et jou PM gestuur oor 'n vragie. Dankbaar.


    Quote Originally Posted by Francois Theron View Post
    The 1 HZ is a bit of a misunderstood engine by many. Because it can run on just about anything and lasts long if looked after, people think it is just a piece of cast iron. Yes compared to current diesels it is an old design, but it still is not so straight forward to work on.

    Two things on the 1HZ are absolutely critical for performance, valve clearance and pump timing.

    Becasue the valve clearance is set through shimming, not people have the skill and/or time and /or tools and/or parts to set this properly.

    The same goes for the pump timing. Half a degree makes a huge difference on a 1 HZ. It goes without saying that pump and injector calibration is also of the utmost importance.

    One of the specialists in 1HZ is Brandwacht Diesel in Worcester +27 23 342 1664. They have gone as far as developing an adjustable timing gear for the 1 HZ to be absolutely sure about the timing, with one tooth on the belt sometimes being too much. Speak to jan Burger.

    A freeflow exhaust and headers do help.

    An yes the 1HZ has had ab EGR valve for at least the last 5 years

    I have driven 1HZ's that will run up and downhill without touch a gearlever ad they were only well tuned. No turbos or funny changes.
    A challenge for those who go. A dream for those who stay behind. " Thierry Sabine




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    Default Re: Improving performance of 1hz 4.2d toyota engine

    Quote Originally Posted by RobH View Post
    The only reliable way of improving a 1HZ's performance is to trade it in on a V8 (said slightly tongue in cheek). Don't waste your money on the rest.
    OR fit a FTE motor.

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    Default Re: Improving performance of 1hz 4.2d toyota engine

    Think we became spoiled with hp and torque. Have owned my share of G60 Patrol pick ups with the original P engine which power were
    107Kw and 270Nm. Same with the FJ45 I have owned @ 101kW and 271Nm. Have done lots of 4x4 and hunting trips in them. We had a G60 tow truck. Recovered heavy trucks with it on numerous occasions. They were on par with the 1HZ @ 96kW 279Nm. That were the norm those days.

    In person I do not think a 1HZ is that bad. If don`t try to drive it like a race car it is actually nice. You never force a 1HZ you leave it at its lazy nature and it will surprise you . Being a normally aspirated diesel it is important to have it in top tune like Francois suggested.

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  18. #13
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    Default Re: Improving performance of 1hz 4.2d toyota engine

    Quote Originally Posted by nhoro View Post
    Usually, you buy the 1HZ motor for reliability and not performance. I would consider that the engine was designed for exactly that, reliability. If you modify it to give more power, you reduce reliability and then what was the purpose of starting with a 1HZ ? Buy a race horse in the beginning and dont try to turn a donkey into one.
    I don't quite agree.

    When you optimize that 1HZ to run on the right specs, you will extend life expectancy, as well as power and have better fuel efficiency.

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    Default Re: Improving performance of 1hz 4.2d toyota engine

    Quote Originally Posted by Francois Theron View Post
    The 1 HZ is a bit of a misunderstood engine by many. Because it can run on just about anything and lasts long if looked after, people think it is just a piece of cast iron. Yes compared to current diesels it is an old design, but it still is not so straight forward to work on.

    Two things on the 1HZ are absolutely critical for performance, valve clearance and pump timing.

    Becasue the valve clearance is set through shimming, not people have the skill and/or time and /or tools and/or parts to set this properly.

    The same goes for the pump timing. Half a degree makes a huge difference on a 1 HZ. It goes without saying that pump and injector calibration is also of the utmost importance.

    One of the specialists in 1HZ is Brandwacht Diesel in Worcester +27 23 342 1664. They have gone as far as developing an adjustable timing gear for the 1 HZ to be absolutely sure about the timing, with one tooth on the belt sometimes being too much. Speak to jan Burger.

    A freeflow exhaust and headers do help.

    An yes the 1HZ has had ab EGR valve for at least the last 5 years

    I have driven 1HZ's that will run up and downhill without touch a gearlever ad they were only well tuned. No turbos or funny changes.
    Any suggestions of a shop in Windhoek that has this attention to detail? My 1HZ has been waiting out covid there and when we get on the road I was going to have her thoroughly gone over. I was planning on going to Etzold, they have been good for us for a minor thing in the past, https://are-etzold.com.

    Thank you to who dredged up this old thread, and this gem of a piece of information.
    Blog of our African travels: stuckinlowgear.com

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  22. #15
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    Default Re: Improving performance of 1hz 4.2d toyota engine

    Hacker Field Services used to be quite good but that was years ago
    There is never a right time to do the wrong thing and never a wrong time to do the right thing!

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  24. #16
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    Default Re: Improving performance of 1hz 4.2d toyota engine

    There are shops in Windhoek that works on cruisers.

    Etzold, Olympia Auto Repairs , and Safari Engineering. I think with either one you will be sorted, and a better option then the agents, if you ask me.

    I have towed a 3 ton many kilos with a 1Hz, of course in 4th. But yes, is like driving a truck, you cant put it in 5th and sit back.
    Johan Kriel

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  26. #17
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    Default Re: Improving performance of 1hz 4.2d toyota engine

    I had one and towing my big trailer with having a RTT on top it almost got so bad you could get out and pull it faster. I then had a turbo and intercooler installed. Make it somewhat more drivable. The fuel consumption has buying shares in an oil company. My Mazda2.5 tdi tows the same trailer with ease and at virtually half the fuel consumption. Admittedly the 1HZ is a donkey as previous threads reiterated and unless you strip it and modify internals you might get it to be livelier but still no racehorse. The cost would also not justify it. In stock form yes it will take you round the world with no hassles but I doubt you'll do it in 80 days.

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