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Boost pressure actuator bank 1
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XDAndy
 


Member Since: 16 Jan 2018
Location: Gibraltar
Posts: 597

United Kingdom 2011 Discovery 4 3.0 TDV6 XS Auto Nara BronzeDiscovery 4

My first thought was “I got to have a different turbo”!

But then I pulled up some photos.



Take a look at the wiring plug in yours, behind the short hose, and compare it to mine.

Something isn’t right.
  
Post #19510865th Jun 2018 10:15 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13568

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

hi andy

indeed it’s difficult to see where urs is leaking, have loaded the pics side by side to compare them , ref the wiring, can’t clearly see if i’m being totally honest

bet it’s staring me in the face Laughing




   
Post #19511155th Jun 2018 11:36 pm
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XDAndy
 


Member Since: 16 Jan 2018
Location: Gibraltar
Posts: 597

United Kingdom 2011 Discovery 4 3.0 TDV6 XS Auto Nara BronzeDiscovery 4

Think the main difference is the amount of exposure you achieved.

I’ve only gotten the one heat shield off.

Any pointer on how to release the others, without breaking anything, so I can get better access?

Andy
  
Post #19511726th Jun 2018 8:23 am
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13568

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

hi andy

found this link ref the heat shields,

https://www.disco3.co.uk/gallery/albums/us...cement.pdf

with the middle one out of the way u can bend the other out of the way to a certain degree, LH side that goes up and over the strut is a complete pig, bolted to a bracket that’s also attached to the top of the strut

bolts were rusty and snapped, ratchet and extension worked well, have to be careful of the height sensor

think the socket was 10mm

is it the short hose ur trying to get to or unsure till u clean it up , got a picture somewhere of the system to try and make life easier how there all connected

not 100% but wonder if removing the main battery and tray if it’s easier to access that small hose , mine was fine so was left alone.

if u have to remove the inner wheel arch easier getting a small tool to get the clips out and buy some spare ones

indeed see how u go , my wheelarch liner and middle heat shield are still out, so if u need any pics plse feel free to ask , can easily take pics if it helps u in any way Thumbs Up
   
Post #19512456th Jun 2018 2:08 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13568

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

2 x intercooler hose replacement

https://www.disco3.co.uk/forum/topic147683.html

still looking for others i’ve seen

turbo replacement video, helpful as it shows u the pipes etc for ref

https://web.archive.org/web/20150416072251...ntercooler




  

Last edited by gstuart on 10th Nov 2022 7:48 pm. Edited 1 time in total 
Post #19512506th Jun 2018 2:23 pm
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XDAndy
 


Member Since: 16 Jan 2018
Location: Gibraltar
Posts: 597

United Kingdom 2011 Discovery 4 3.0 TDV6 XS Auto Nara BronzeDiscovery 4

Thanks GS!

Appreciate those.

Will look at later, but I’m chatting to a friend who has a mechanical engineering background

Has raised the question of the boost pressure, and is it excessive?


Click image to enlarge


Reading the LR training workbook, it suggested the turbo should be maintaining a constant boost pressure, modulated by MAP.

This is all peaks and troughs.

Does anyone have a graph of their boost pressure or know what the expected values are?
  
Post #19516947th Jun 2018 8:37 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13568

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

hi andy

that’s interesting ref the graph

i did take some readings a little while ago of the map and maf sensor , have put it here for u as a comparison

however just realised its at tick-over so will have have to go for a drive

never done a live data record before so will see how to do it with the iid




converting the MAP Kpa to psi , but that’s @834Rpm so will have to do it at higher revs to compare with ur 15.4 psi Map reading




  

Last edited by gstuart on 7th Jun 2018 10:40 pm. Edited 4 times in total 
Post #19517147th Jun 2018 10:00 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13568

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

i’ve also been reading that


INTAKE AIR TEMPERATURE (BOOST AIR TEMPERATURE) SENSOR
The IAT (intake air temperature) is located in the rear of the intake chamber immediately preceding the electric throttle. The sensor is used to measure the intake air temperature from the turbo in order to calculate the required amount of fuelling.



also the sensor below i believe is also the MAP sensor ???, unless i’m reading it wrong , seeing it’s located in the throttle butterfly body


The Boost Pressure (BP) sensor is located post turbo after the eclectic throttle valve. The sensor provides a voltage signal to the ECM relative to the intake manifold pressure. The BP sensor has a three pin connector which is connected to the ECM and provides a 5V reference supply from the ECM, a signal input to the ECM and a ground for the sensor.
The BP sensor uses diaphragm transducer to measure pressure. The ECM uses the BP sensor signal for the following functions:
� Maintain manifold boost pressure.
� Reduce exhaust smoke emissions when driving at high altitude. � Control of the EGR system.
� Control of the vacuum control module.


“””””If the BP sensor fails, the ECM uses a default pressure of 1013 mbar (14 lbf/in2). “””””””


In the event of a BP sensor failure, the following symptoms may be observed:
� Altitude compensation inoperative (black smoke emitted from the exhaust). � Active boost control inoperative.
Boost control is achieved by the use of a direct drive electric actuator. The actuator is attached to the side of the turbo unit and is connected with the control mechanism via a linkage. The electric actuator works on the torque motor principal and has integrated control module.
The electric actuator moves the control vanes through an 60 degree stroke and has the capability to learn its own maximum stroke positions. The electric actuator is controlled via PWM signals from the ECM
   
Post #19517277th Jun 2018 10:31 pm
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XDAndy
 


Member Since: 16 Jan 2018
Location: Gibraltar
Posts: 597

United Kingdom 2011 Discovery 4 3.0 TDV6 XS Auto Nara BronzeDiscovery 4

Hmmm.

I wonder if the “boost pressure” sensor and “MAP” sensor are the same thing, just called different names by different sources.
  
Post #19517708th Jun 2018 8:02 am
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XDAndy
 


Member Since: 16 Jan 2018
Location: Gibraltar
Posts: 597

United Kingdom 2011 Discovery 4 3.0 TDV6 XS Auto Nara BronzeDiscovery 4

As for live data record, if you look at the screen shot you posted of your live values, the red circle top right is the record button.

Press it and it will record the session.

Once you have saved the session, you can open it later and stillcswitch between graph ornumerical values.
  
Post #19517718th Jun 2018 8:05 am
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10335

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

boost pressure will never be a flat line.

When you first start the car it will be low.

Using lots of throttle will produce pressure and the peak will be limited
  
Post #19518368th Jun 2018 10:53 am
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10335

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

XDAndy wrote:
Hmmm.

I wonder if the “boost pressure” sensor and “MAP” sensor are the same thing, just called different names by different sources.


Yes, it does seam so.
  
Post #19518388th Jun 2018 10:57 am
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XDAndy
 


Member Since: 16 Jan 2018
Location: Gibraltar
Posts: 597

United Kingdom 2011 Discovery 4 3.0 TDV6 XS Auto Nara BronzeDiscovery 4

Pete K wrote:
boost pressure will never be a flat line.

When you first start the car it will be low.

Using lots of throttle will produce pressure and the peak will be limited


Dont suppose anyone has an idea fo what the upper limit should be?

My engineering friend has the feeling that pressures of 32 psi is way too high.

If anyone else with an iid tool can grab some values, I recorded MAP, MAF, throttle position and engine speed.

Would be good to see what people get, especially those with new turbo's.

Andy
  
Post #19518478th Jun 2018 11:54 am
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13568

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

XDAndy wrote:
Hmmm.

I wonder if the “boost pressure” sensor and “MAP” sensor are the same thing, just called different names by different sources.


hi

indeed that’s what i was also wondering , ref the sensors

thks ref the red button on the iid and will be good getting comparisons so we know what the readings should be Thumbs Up
   
Post #19518908th Jun 2018 3:55 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10335

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

Now all you need is someone with a good turbo Rolling with laughter
  
Post #19519248th Jun 2018 5:37 pm
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