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| Defender-Stu Member Since: 14 Jun 2012 Location: South West England Posts: 1320  
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Wow that's 1.6 bar and a little high if I'm right as the std boost is about 0.7 bar but could be wrong?
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21st Jan 2013 8:29am |
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| Tim seymour Member Since: 17 Jan 2010 Location: Devonport TAS Posts: 92 
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1.3 bar i thought 18 psi was the go cheers Tim Cess the Taswegian
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21st Jan 2013 8:53am |
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| Regard Member Since: 08 Dec 2011 Location: RSA Posts: 251  
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Mine also have a remap/intercooler/de-cat and my max Boost PSI that I could get was 19PSI.
No error codes though...... |
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21st Jan 2013 12:20pm |
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| Lorryman100 Member Since: 01 Oct 2010 Location: Here Posts: 2686 |
33 -34 psi, 232KPA with a remap and standard intercooler.
 Click image to enlarge Another factor to consider is the ambient air temp and air density, I stay in Scotland where the air is mostly cold and damp even in the summer time 
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21st Jan 2013 3:15pm |
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| Lorryman100 Member Since: 01 Oct 2010 Location: Here Posts: 2686 |
And a OEM reading of 31-32 psi, 218 kPa.
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21st Jan 2013 6:36pm |
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| Regard Member Since: 08 Dec 2011 Location: RSA Posts: 251
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Should you not remember to subtract barometric pressure from your manifold pressure to get actual boost pressure? On both readings you took boost pressure only as the Manifold pressure. IF I understand correctly, manifold pressure is actually boost pressure plus barometric pressure together to give you an absolute manifold pressure? Thus, should your boost pressure not be: 218kPa-99kPa=119kPa. This will equate to 17psi and would sound much more realistic and will fit in exactly with all the readings I've observed before? Admin note: this post has had its images recovered from a money grabbing photo hosting site and reinstated |
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21st Jan 2013 6:56pm |
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| Glynparry25 Member Since: 16 Feb 2009 Location: Miserable Midlands Posts: 3015  
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33PSI!!... now that is impressive, lol. 232Kpa is about 18-19psi in boost terms.
Also remember that urbos aren't an exact science. When I was into modified cars I was running a Garrett GT28RS through a Blitz boost modulator which had real time data logging. I had it set to 1.5bar (21ish psi) but in the data logs I had spikes up to 2bar- but only momentarily (less than 0.5 of a second). Every turbo will do this, and if your ECU notices it there will be a DTA code for it- but 99% of the time it is nothing to worry about- I am sure the ECU will go into limp mode if it was a constant. Glyn   Last edited by Glynparry25 on 21st Jan 2013 7:48pm. Edited 1 time in total |
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21st Jan 2013 7:07pm |
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| Lorryman100 Member Since: 01 Oct 2010 Location: Here Posts: 2686 |
Manifold pressure is just boost pressure + atmospheric pressure located in the manifold at the MAP sensor. To find the true boost from the turbo you need to subtract the atmospheric pressure from the manifold pressure. At sea level this is 14.7 psi so 34 psi - 14.7 psi = 19.3 psi boost pressure, this is a basic interpretation of actual boost without taking into account the actual mass of air entering the engine is directly proportional to the air density, which is proportional to the absolute pressure, and inversely proportional to the absolute temperature. I assumed wrongly that Tim was using his MSV2 and was quoting the manifold absolute pressure recorded in the duratorq live data page.
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21st Jan 2013 7:41pm |
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| Glynparry25 Member Since: 16 Feb 2009 Location: Miserable Midlands Posts: 3015
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Bri, did you eat an encyclopedia for dinner?
Glyn |
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21st Jan 2013 7:56pm |
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| Lorryman100 Member Since: 01 Oct 2010 Location: Here Posts: 2686 |
Nah, I had a curry Glyn.
If you look at the 2.2 EGR version above, the pressure @ the Manifold is 232kPa (33.64 psi). The atmospheric pressure is 96kPa (13.92 psi) which after deducting 96 from 232 leaves 136kPa or 19.72psi and I have just checked the dtc file from the duratorq EMS file from the same session which shows an untested dtc logged for P0234 as well. I commonly get P0234 Over boost and P0299 Under boost as untested dtc's when running with a remap file which don't cause me any concerns.
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21st Jan 2013 8:29pm |
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| bell-auto-services Member Since: 08 Jul 2007 Location: North Yorkshire Posts: 2232 
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Depending on which of the 12 boost maps the engine is running on, in standard form you should not see much more than 230kpa total pressure including atmospheric.
Pete |
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21st Jan 2013 9:15pm |
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| dgardel Member Since: 30 Nov 2008 Location: Veneto (Heart & Head) Posts: 3586 
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Mhmmm I need to check mine....... Discovery 5 td6 HSE Stornoway Gray Outback Engineering Limited Edition
IID Pro MV License |
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21st Jan 2013 11:15pm |
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| Tim seymour Member Since: 17 Jan 2010 Location: Devonport TAS Posts: 92
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[quote="bell-auto-services"]Depending on which of the 12 boost maps the engine is running on, in standard form you should not see much more than 230kpa total pressure including atmospheric.
Thankyou to all this is a great web site you learn so much cheers Tim  Cess the Taswegian |
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22nd Jan 2013 7:16am |
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| Tim seymour Member Since: 17 Jan 2010 Location: Devonport TAS Posts: 92
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[quote="Tim seymour"]
just thinkig of put a decat pipe on my defender would i need to re do the map and would that help with spiking cheers Tim Cess the Taswegian |
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26th Jan 2013 11:35am |
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