Member Since: 21 Oct 2016
Location: kent
Posts: 13635
may i also ask a daft question please and trying to understand the system better
does the actuator arm move according to revs or speed please
drove on a motorway today and was fine as i kept it just under 60mph and below 2,500 revs so just got me thinking if limp mode activates by revs or speed , or is it the case the actuator arm won’t move until you’ve reached a min speed if that makes sense
once again apologises for the daft question
many thks so much in advance
13th Apr 2018 7:50 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10363
Good question. Not sure but I think it moves due to boost pressure and how down the throttle Pedal is.
If you drive very lightly on the throttle it shouldn't move much and thus not throw errors
13th Apr 2018 8:52 pm
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 13635
hi pete
thks as that makes a lot of sense , reason i say that because , as i was coming back over the QE2. bridge i was doing around 50 mph , i could hear the gearbox was just about to drop a gear
i lifted off the acc pedal and then gently back on again to prevent the gearbox dropping a gear and raising the revs which in turn i was worried of it going into limp mode
done a 100 x mile round trip today and didn’t throw up the limp mode fault once by just lifting off and back on again
which indeed then got me thinking ref the relation of speed and revs of the turbos limp mode error
been looking at what type of turbo it is, looks like a variable vain turbo ????
just like to learn a lot more to get a better understanding
yeh i know need to get out more
thks again
13th Apr 2018 9:29 pm
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 13635
found an interesting link seeing the inside of the turbos, didn’t realise u can buy seperate parts , but indeed if it came to it would get one complete and all set up correctly , just wished to share the link
Member Since: 15 Jan 2016
Location: GL
Posts: 10363
Those links aren't the bit that requires replacement.
Try searching nozzle 2.7
I couldn't get the turbo apart though even heating it up.
With the amout of time to fit it though not worth it
Last edited by Pete K on 13th Apr 2018 11:12 pm. Edited 1 time in total
13th Apr 2018 11:05 pm
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 13635
found this video and wondering if the experts would be so kind please if u consider this a basic description of how the turbo works in the D3 please
many thks
13th Apr 2018 11:06 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10363
Yeap that's like the LR one. Except no vacuume pipe. Electric actuator instead.
But that rod is getting stuck at certain points or maximum.
At maximum boost those vanes move So the exhaust goes straight out and not over the fan.
Therefore the fan /compressor doesn't get any faster.
And this doesn't force any more air into the engine on the inlet side.
13th Apr 2018 11:21 pm
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 13635
thks pete
have learnt a lot and indeed now getting a better understanding ref the over boosting errors
so am i right to assume then the ecu monitors readings from the MAF sensor and then adjusts the turbo vanes accordingly , or not as simple as that , ie takes a collective readings from the multitude of engine sensors
very grateful once again and at least the video may be educational for others concerning turbos
13th Apr 2018 11:59 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10363
I don't fully understand these new VVT turbo's myself.
They do all sorts of cleaver things.
But basically when you use lots of throttle and are pushed back into your seat, this is when the turbo is at peak performance and when the ecu will be trying to operate the VVT (at maximum) to prevent further turbo speed. If the boost doesn't drop this is when the ecu panics and massively cuts engine power.
Turbo also spools up when in a high gear and using lots of throttle (over take) hence why another poster was using command shift to use more of the engine revs rather than turbo boost
14th Apr 2018 10:39 am
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 13635
thks pete
just a few days ago didn’t realise at first u can buy the vnt assembly and cartridge for these turbos
ref the VVT plate and further reading i can now see what those turbo cleaners are used for , thought it was just the blades but see it’s to remove the carbon from the VVT plates allowing them to move
shame the turbo casing couldn’t be easily taken apart in situ and a new cartridge and VNT plate installed to save the nightmare of removing the entire turbo
intrigues me how the turbo cleaner u put into ur fuel tank is able to decarbonise on the VNT plate vs the tins of spray thats slowly put down the air intake
like u say really clever stuff and at least i now have a very basic concept , he says
looking at costs , see for a borg and warner exchange is around £300 , outright £800
feel a lot happier now it isn’t the eye watering 2.5k
14th Apr 2018 1:03 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10363
yeap that's the one.
A year ago you could buy the VVT unit on ebay for D3 but can't see them now
14th Apr 2018 3:55 pm
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 13635
Member Since: 15 Jan 2016
Location: GL
Posts: 10363
thanks. useful to know.
14th Apr 2018 6:02 pm
Oswiperus D3 Decade
Member Since: 02 Apr 2010
Location: Chelmsford, Essex
Posts: 1590
Assuming your actuator rod is free (and it has to be free I.e. Offering almost no resistance when you move it) then i doubt there is anything wrong with the turbo itself, it will more than likely be the actuator but you can't fit a new one as apparently it is calibrated to the turbo.
As Pete k says, it's boost related not revs, well it was on mine and a I still managed to tow with it but wouldn't let it lug up a hill, I would drop as many gears as I needed to (normally 1 or 2 gears more than it would normally do by itself) so I was using higher revs but not working it hard, used it like that for a fair while until I plucked up enough courage to change the turbo.Stu
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14th Apr 2018 6:04 pm
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 13635
hi oswiperus
thks, was trying to get a better knowledge first before i start to delve into accessing the turbo
indeed fingers crossed it may just be a sticking actuator or maybe the small split hose
did buy a set of the 3 x silicone intercooler hoses along with some T bolt stainless steel clamps
as i will be replacing the passenger side strut anyway i can then carry on further for access to the turbo and see what the score is
gained a far better understanding now , did also add the turbo software update to motor the actuator arm over , i also bought a tin of ceramic grease in advance
reminds me i must buy a selection of small wire brushes off ebay
also thinking i should be able to get a far better look once i remove the old turbo intercooler hoses and if possible trying to see if theres a lot of carbon build up , as the front strut , panels , heat shileds etc will all be out of the way
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