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  1. zd30 fault code 46# intake air abnormal

    Nissan Patrol GU/GR Y61
    Hi, you can also get an "excessive MAF reading" if the earth/ground is no longer connected to the MAF sensor. In that case, since there is no more ground reference, the ECU can see a very high tension when idle for example, and generate that code. I got that when I was implementing my new VNT...
  2. Idles high after I drive it

    3 Litre ZD30 DI Engine
    That is an interesting story. Yes the ECU is the one controlling the idle, and it corrects/controls the IP fuel injection to get the 750RPM. I don't understand why an ECU would suddenly need an 'idle reset', unless a sensor is dying, or mis-functioning, or misleading the ECU. Or possibly the IP...
  3. Idles high after I drive it

    3 Litre ZD30 DI Engine
    All was said by Ross. A simple question, though. When you press the heat switch when motor is cold, does the RPM goes to 1200 ? If you now put first gear on, what happens ? Same questions when hot. When "truly" idle, it is the ECU which monitors/controls the RPM and make the IP to inject the...
  4. One Dawes and Two needle VNT Control for ZD30

    Nissan Patrol GU/GR Y61
    The different bumps above are due to my driving to make sure I would catch the 3.55V 'killed limp'. I don"t have a flat and a long enough straight road 'handy' where I live. Below is another catch with gears one to five, but there is a turn at some point in time and I could not leave enough...
  5. One Dawes and Two needle VNT Control for ZD30

    Nissan Patrol GU/GR Y61
    I'll measure it for you when I find the time. If you have a CRD, I am sure you can find OBD software which gives you to all 'accessible' parameters. I have many for my MEGANE RS, and the Renault 'clip' software in particular for that car. I also use Nissan data scan 1 for my OBD2-Consult 2000...
  6. One Dawes and Two needle VNT Control for ZD30

    Nissan Patrol GU/GR Y61
    last but not least, I don"t see any reason why, with having the VNT turbo working as it should ( ie VARIABLE nose turbo), the EGTs would go up. What is clear, is that if you open the vanes sooner, you'll get a bigger flow of air ( a diesel works with an excess of air), and the ECU will get to...
  7. One Dawes and Two needle VNT Control for ZD30

    Nissan Patrol GU/GR Y61
    short answer : no idea. long one : In my country, out of 6000 PATROLS, almost nobody checks EGT. What we are paranoid about is boost value / MAF - Air flow, injectors preventive replacement every 100 000km (1600bar pressure - if they go wrong, they crack the pistons) as well as glow plugs. And...
  8. One Dawes and Two needle VNT Control for ZD30

    Nissan Patrol GU/GR Y61
    Hi, What gave me the idea to unscrew to improve in altitude was the fact ( and you can check it with your ECUtalk tracking the VACSOL pwm value sent by the ECU), that the pwm value sent to the Vacsol by the ECU varies with Altitude at idle (max vanes closure) BUT the limiting screw prevents...
  9. One Dawes and Two needle VNT Control for ZD30

    Nissan Patrol GU/GR Y61
    Not very surprising, but with no overboost and no drop in boost linked to EGR blocked, nor too high a boost with my 3" exhaust. And lots of air in. Much more than before. I left it to the ECU to decide the volume of fuel which I assume it does using its maps which depend upon its reading of MAF...
  10. One Dawes and Two needle VNT Control for ZD30

    Nissan Patrol GU/GR Y61
    I did not say inefficient. I am sure you have reached the best arrangement ever for your Patrol configuration. And the REMAP does, I imagine, provide the right level of fueling vs MAF - RPM - TPS. Nobody does REMAPs here for this old ECU with soldered PROMs. So I had to find another way, to get...
  11. One Dawes and Two needle VNT Control for ZD30

    Nissan Patrol GU/GR Y61
    t That is an excellent question. No idea. I'll have to find somebody with a dyno I can trust in my region, even if originally, it was not my objective. objective N01 was to get a properly controlled smooth and continuous rise in boost with TPS/REvs, maximising the MAF value. objective N02 was...
  12. One Dawes and Two needle VNT Control for ZD30

    Nissan Patrol GU/GR Y61
    At the moment, I have around 12 psi on a flat motorway at 130km/h. And I have 5-6 psi at 80km/h and 8-10 at 110km/h But this is with my Electronics and Sw. I was getting similar values previously with the three valves. With the three valves, there is no need to compromise on spool-up and boost...
  13. One Dawes and Two needle VNT Control for ZD30

    Nissan Patrol GU/GR Y61
    I have no doubt about your knowledge and tests Ross. I am attaching here a capture of MAP - MAF - RPM done this morning on my old lady to demonstrate what I am trying to explain with Boost (MAP) vs Air flow (MAF). My Patrol is stock standard except EGR blocked, 3" stainless steel exhaust WITH...
  14. One Dawes and Two needle VNT Control for ZD30

    Nissan Patrol GU/GR Y61
    what matters is MAF voltage, and therefore air flow. I don’t understand why you are all paranoid with boost. And by the way, that race to high boost is detrimental to engine performance. only air flow plus fuel make the beast run. With that arrangement you can set and tune as you wish.
  15. One Dawes and Two needle VNT Control for ZD30

    Nissan Patrol GU/GR Y61
    one dawes valve. two needles. = three « valves » in total.
  16. Engine cutting out

    3 Litre ZD30 DI Engine
    probably because the clogging was not 'uniform' nor flat inside the fuel filter ? may be.
  17. One Dawes and Two needle VNT Control for ZD30

    Nissan Patrol GU/GR Y61
    If you want to test a far better arrangement leaving behind the limitations you just mentioned try this : 1/ PUT A NEEDLE BEHIND THE DAWES ( ie in serie with). MAKE THE DAWES TO OPEN MUCH MUCH EARLIER ( ie unscrew it almost to max, so that it opens as soon as some positive pressure is seen by...
  18. Engine cutting out

    3 Litre ZD30 DI Engine
    Hello, very often, in a cold weather ( 2°C or less...) the fuel filter can get clogged if it contains water. Fuel + water + cold = what a frog like me would call "parafine". It happened three times to me in the mountains overnight in winter. I now replace my fuel filter every year BEFORE going...
  19. Stuttering after filling tank

    3 Litre ZD30 DI Engine
    Hello, I have seen that elsewhere. There is a valve which allows air to come in the tank when the level of diesel goes down. It keeps a minimum depressure in the tank. If that valve is stuck, then when your tank is full, the depresure quickly goes up as the fuel is being used. Try to open the...
  20. EGR Volume Capacity

    3 Litre ZD30 DI Engine
    What I usually does, is to fix anything which looks wrong first. And then I wonder about any problem left. You seem to have indentified an unusual noise. Look for it and fix it to start with.
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