however seems really slow and lacking power in 1st maybe 2nd
unfortunately .. in standard tune ( no engine mods what so ever ) they are like that ..
particularly once the egr and intake manifold have gunked up
i got my td4 ( manual gear box ) at 37k miles on clock ..
1st thing i noticed was that low rpm engine response was pathetic to say the least ..
a few things inhibit the response ..
( i.e. given all the engine bits are in good working order )
the egr unit ..
the pre-air filter intake ducting .. and ..
the restrictions on the exhaust caused by the cat and back-box
the thing is .. the driver does not have full control over
how much fuel can be injected on driver-demand ( go pedal )
it's a case of the go-pedal acts as a 'request' ..
and the ecu either gives permission for more fuel .. or doesn't .. depending
on the td4/m47r engine .. airflow over the MAF sensor plays an important part
the quicker the intake air starts to flow .. the sooner the ecu will allow more fuel to be injected
then .. there is the air intake temp. sensor
on older models the a.i.temp measurement is incorporated with maf sensor ..
at some stage lr installed a separate a.i.t sensor just after the intercooler / before the egr ..
basicaly a high a.i.t. means a lower air-mass .. cooler air means a higher air mass ..
( hence the fitting of an 'intercooler' after the turbocharger
( as the compressed air post-turbo is quite hot
ideally for best engine response .. fast cold air on the intake ..
and unrestricted exhaust gas thru the turbo be the way to go ..
even with various mods done ..
it still takes getting to 3rd gear on the manual box .. to get the air moving properly
( no idea about auto gear boxes )
so .. as to various modifications to improve engine response
particularly the lower rpm range ..
get rid of the egr unit ( as mentioned ) and replace it with an egr-delete unit
like this ( pic attached )
added info here:
https://www.landyzone.co.uk/land-rover/where-does-this-go.223312/#post-2536215
and .. clean out the intake manifold ..
do the air-intake mod.
main thread here:
https://www.landyzone.co.uk/land-rover/intercooler-problem-mod.126484/
mine here:
https://www.landyzone.co.uk/land-rover/intercooler-problem-mod.126484/page-2#post-3853325
( in that insulation is desired to inhibit engine bay heat soak ..
( on a sunny 27c deg day .. parked up .. engine off
( a.i.t. temps can reach 50c deg .. result be sloth-like response from engine
( and can take several miles of driving for it to cool down somewhat
even without any fuelling mods like a tuning box or re-map
the a.i. mods works well ..
i've tried it .. turning all fuelling mods 'off' ..
didn't notice a lessening of power until i went for an hopefully quick overtake
fit a straight thru exhaust back box ..
e.g. from MuddyMods
( here: ..
https://www.muddymods.com/products/td4-performance-back-box .. )
this allows the turbo to get moving sooner ..
certainly helps low rpm torque ..
( and as a bonus .. it sounds better .. imho
( obviously depending on owners taste
de-catting the exhaust would also help no doubt
( not done that myself .. can only speculate )
get the ecu re-mapped .. and / or fit a quality tuning module
( the 'synergy' .. aka 'ronbox' is a favourite in these parts
( here: ..
http://www.tuning-diesels.co.uk ..
both will give a stronger engine response .. more bhp ..
include a turbo controller .. like the DGB1 ..
( from the the same makers of the synergy tuning modules )
it actually helps quite a bit with regards to engine response
depending on its setting ..
but .. do the other mods first ..
as cool air movement in .. and de-restricted exhaust gas out are primary requirements
oh .. and .. unless you think you need it ..
remove the foam-surround from off the air-filter ..
it's somewhat restrictive .. and i guess it's there to prevent some objects from
puncturing the paper element ..
more likely to occur when off-road i would have thought ..
any object that would get thru the air-filter and maf housing grate
would most likely damage the turbocharger
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links to most of the above are in my sig. ( bottom of post )
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