 | Home > Td5 > Standard Max Turbo boost pressure - what is it? |
 
|
|
|
| wslr Member Since: 18 Jul 2010 Location: Wellington, Somerset Posts: 581  
|
215 - 220Kpa is usually what you will see at full manifold pressure if everything is good. If you are testing it though, the vehicle needs to be under load. That is effectively being driven while reading T4's live data (or Dynamic data is you use AutoLogic...).
|
||
19th Dec 2011 11:59am |
|
| Zeus Member Since: 14 Dec 2011 Location: Dumfriesshire, UK Posts: 10
|
Thanks. Mine is running at 200 almost eaxcactly as measured with my Nanocom. I can log the data and then graph it so it is quite clear that the turbo wastegate is opening at bang on 200 and keeping the boost regulated to that figure.
I guess I'll try a turn of the nut on the actuator to see if I can set it 220. Just out of pure interest, what does a disco TD5 run at. I know the ECU has control of the wastegate on the Disco so it must have need of varying the setting on a Disco for some reason. (more performance?) Zeus 2004 110 XS SW |
||
|
19th Dec 2011 12:22pm |
|
| wslr Member Since: 18 Jul 2010 Location: Wellington, Somerset Posts: 581
|
Discovery still do the same. T4 will show the the data on the module unit controlling the Discovery on the live data screen, but both appear to have the same end effect of controlling the manifold pressure.
If you are not getting full boost at the manifold and the Nano is correct, then your first port of call should be checking the fuel system for the 4 bar of pressure required, otherwise if you are only getting say 3.3 bar, you won't really notice any performance issue when driving. If you can check the MAF sensor, the usual check is for 55-60kg/h at idle without loads, and around 190ish at 2000rpm. If it is mapped in any way, you may see the MAF run off the scale once it hits 620ish. Do you want me to PM you with info on making a td5 fuel pressure gauge? |
||
|
19th Dec 2011 12:32pm |
|
| Zeus Member Since: 14 Dec 2011 Location: Dumfriesshire, UK Posts: 10
|
Yes please - I changed the fuel pressure regulator a couple of years ago as it was spotted to be leaking on an MOT. I assume they are non adjustable (I hope so as I just took the new one out of the box and bolted it up) Thanks Zeus 2004 110 XS SW |
||
|
19th Dec 2011 1:13pm |
|
| wslr Member Since: 18 Jul 2010 Location: Wellington, Somerset Posts: 581
|
80% of the time, the fuel pressure regulators leak from new new. The unit is made up of 2 sections, and when the one section is inserted into the main section, the o-ring gets damaged because they don't chamfer the metal. The o-ring gets damaged and the unit leaks. They don't tend to use fuel resistant o-rings either from what I see. They can be rebuilt and a local chap down near Tiverton does this for us. None of these (so far) have leaked.
Here is the main one we use here. We had it made up at a local hydraulic place.  Click image to enlarge Click image to enlarge Click image to enlarge Click image to enlarge You just need to remove the metal pipe and the rubber hose from an old regulator unit. Ours is long because we can fit the gauge through the window of the vehicle so we can read what the fuel pressure is doing under certain driver demand. We also have the SPX tool, but this is not really any use for this sort of thing, just for testing the pressures at the filter head as described in the workshop manual. |
||
|
19th Dec 2011 2:17pm |
|
| Zeus Member Since: 14 Dec 2011 Location: Dumfriesshire, UK Posts: 10
|
Thanks very much.
My new MAF sensor is coming tomorrow so I will be putting that on and having a look at the boost pressure setting. If that still does not give me the desired effect then I will look at making up the fuel pressure gage. Rather annoyingly, I just threw out the box that contained my old leaky regulator and spare hose the other day in a mad tidy-up. Without the old hose it will be harder to make - drat! Zeus. 2004 110 XS SW |
||
|
19th Dec 2011 3:42pm |
|
|
|
| All times are GMT |
< Previous Topic | Next Topic > |
Posting Rules
|
Site Copyright © 2006-2024 Futuranet Ltd & Martin Lewis
