When does turbo reach full boost

Hi all,, recently noticed my freelander taking longer to come on full boost, well i'm 99% sure it seemed to hit full boost around the 2k mark but now its 3k, very sluggish taking off but when on 3k or after their's full power, but its a pain having to rev it out all the time.

Is this a common problem/fault. If so, anyone know how to fix it?


Many thanks

full boost .. ? .. plus 14/16 psi ? ( 28/30 psi m.a.p. ) or thereabouts ..

i think somewhere between 3k and 3.5k rpm .. if you have your foot buried in it ..
( i could be wrong .. too busy watching the road at those rpm
( to pay much attention as to how the turbo pressure rises
whatever rpm .. 1500 and above .. how much psi depends so much on go-pedal movement
.. 'n engine load ..

i could maybe/possibly vid the rpm/turbo pressure in real time digital readout
4th gear full go-pedal .. after i get my filter 'n pump changed next week

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very sluggish taking off but when on 3k or after their's full power

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could easily be a degraded maf sensor ..
below 2500 rpm the ecu won't inject much fuel If the maf sensor signal values are too low

rover ron's tuning website :
Tuning-diesels for low cost diesel tuning.

td4 engine faults :
ROVER 75 MGZT ENGINE FAULT FINDING

about the 'maf' sensor :
Maf sensor problems.

freelander td4 mpg :
http://www.landyzone.co.uk/lz/f9/mpg-my-td4-results-181789.html

about the td4 engine ( bmw m47r ) :
m47r_diesel.pdf (5 MB)
( does not include info. re. the variable vane type turbo )

regarding the Air Intake Temperature sensor :
http://www.landyzone.co.uk/lz/f9/black-smoke-224520.html

about common rail fuel systems ( as on the 'td4' m47r engine ) :
http://www.yildiz.edu.tr/~oisin/Dersler/Dersnotlari/0653611/dinjection.pdf

Mine hits full boost around 2k.

Yeah pretty sure mine was hitting full boost at 2k aswell.

But now its 3k and i know there's no leaks or anything cause it does go on full boost and piles of power but it's just taking longer to reach it.

Is this the maf then?

Noticed a big difference in it one day. Was driving it early in the day and parked up for an hour or so, then when i got back into it i thought oh sh1t turbo is gone but noticed full boost then at 3k so knew it wasn't turbo.

To eliminate the MAF sensor disconnect it & take it for a run, engine management light will come on but performance will be restored if it is a MAF fault. To be honest it does sound like a MAF fault sluggish at take off up to 3,000 rpm are typical symptoms of a faulty MAF

matacaibo said:

To eliminate the MAF sensor disconnect it & take it for a run, engine management light will come on but performance will be restored if it is a MAF fault. To be honest it does sound like a MAF fault sluggish at take off up to 3,000 rpm are typical symptoms of a faulty MAF

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I'll try this tomorrow and hopefully that's all it is. Should be anyway though cause it was fine when i parked it in and then taking it out again it had the fault. Defo not turbo because there's full boost and defo full power after 3k.

Thanks for the replies and i'll report back tomorrow of the findings.

Have another issue too and from what i'm reading its a typical problem with the freelander, is shake/wobble under acceleration, gear stick wobbles side to side. When i let foot off there's no wobble or shake at all. Was underneath yesterday and everything seemed tight