Hello, I have just acquired a Disco 2 td5 auto off my friend. It has a bell auto services installed vgt turbo, boost box, decat, egr remove, full stainless turbo back, bigger intercooler and I cant believe how awful it is. I have nanocom on it and am looking around. I live at sea level and the Ambient Air pressure sensing is showing approx 890kpa, I also have a large hill behind my house and it is adjusting by about 10 kpa across 400 feet. Expecting 1013kpa at sea level, would this create a massive lag at low rpm? No pull until well over 2k rpm .Is there anyone on here that may be able to clear this up? Cheers!
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Sounds like the vnt isn't closing down at low rpm to give boost. You should have a vacuum signal at the vnt actuator on idle. Unless this is some sorta weird conversion that uses a different actuator system.
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Thanks for the reply, the actuator line is direct to the steel compessor output pipe, I will check the idle state and report back.Comment
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When i looked at the actuator yesterday i was trying to put pressure in! Live and learn
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Also I have not seen it move on idle or revving/blipping at standstll so far, the actuator is quite hard to move manuallyComment
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If the actuator line is from the compressor outlet then it's been converted to a pressure vnt system. I have never seen these work right. Try shortening the actuator rod.
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By the look there is about 12mm of thread left of adjustment. I will try that and get back in a little bit, Thanks .Comment
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Also check if you can see a limit screw on the turbo. The actuator system should pull the control lever up onto that screw when at idle. Also try adjusting that screw shorter to close the vnt down more. If it's too open it will be laggy too closed causes a large exhaust back pressure which you feel release as soon as the actuator opens slightly.
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I will get a picture, cheers.Comment
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I have a '00 Disco TD5 manual & whilst mine is standard aside from an EGR delete, they tend to be very very slow until the revs pick up when taking off from stand still. Others I've driven have tended to be much the same...Comment
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I have heard that they are slow on the startup and pull away, I have driven a few but his seems wrong considering it is supposed be 180 hp and 430NM, it's bloody rubbish in town!Comment
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In your first picture you can just see the rusty limit adjustment screw that the lever should be sitting up against when it's at idle. It looks well off in the pictures but it's hard to see due to the angle.
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Hello it is backed off quite far, leaving 4-5 mm screwed out below.The pipe attached to the input pipe has slight vacuum whilst idling. It is still pi$$ing it down so tomorrow is another day for adjusting the rod .
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So have I got this, the actuator defaults to lift the rod at idle (no pressure), and the actuator pushes downward once the turbine is generating pressure, adjusting the internal geometry. The stop is protruding only about 3mm down currently, with a good 12-13mm spare on the thread. You mentioned large exhaust back pressure if the stop is in too short a position? Would that pressure stop it from spinning up the turbine initially?Comment
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