 | Home > Puma (Tdci) > Puma EGR strategy? |
 
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| Alive Tuning Member Since: 01 Mar 2010 Location: Louth Posts: 609   
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The EGR system on puma will modulate quite a lot at idle, as it does at part throttle positions when cruising.
Upon acceleration, the EGR should snap shut to help give you as much air as possible for increased engine performance. If you rev the car from idle, you'll see it goes to 0% as it pulls its settings from deeper within the egr maps. I am sure you are aware we can close off the EGR with our remaps, or disable it completely. Regards, Gary. |
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10th Feb 2012 4:35pm |
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| mturri Member Since: 13 Jul 2010 Location: Patagonia Posts: 29  
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Thank you for the insight!
Rgds Matt |
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11th Feb 2012 1:17am |
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| Lorryman100 Member Since: 01 Oct 2010 Location: Here Posts: 2686 |
Have a look at this post I did on the EGR closed upgrade from Alive tuning. Included in the post is some live data videos showing the EGR operating through the rev range and may help you to understand its workings more.
http://www.defender2.net/forum/topic10564....tuning+egr |
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11th Feb 2012 1:54am |
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| mturri Member Since: 13 Jul 2010 Location: Patagonia Posts: 29
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Very helpful indeed! Thanks much! One other thing that caught my attention on the subject Puma was that fuel temp was steady at 35 °C (driving around town with engine at normal op temp), would have expected fuel temp to be noticeable higher and also somewhat sensitive to varying fueling conditions... will start a new thread on this one though. Rgds Matt |
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11th Feb 2012 2:42am |
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| Lorryman100 Member Since: 01 Oct 2010 Location: Here Posts: 2686 |
When you consider the fuel temp readings with the Puma, you may also have to take a few other things into account as well. Firstly there is no separate fuel lift pump on the Puma as the main pump does the lifting from the tank so no rise in temp through the operation of an electric pump. Also the fuel is not in the high pressure side of the fuel system for very long so the heat transfer from a hot engine would be minimal whilst driving. The fuel return to the tank through the fuel cooler may raise the tank temp but the volume of returned fuel may be negligible in relation to raising the temp? What was the ambient air temp during the test? The only time I would expect to see a rise in the fuel temp from the ambient tank temp would be once it entered the HP side of the pump and heat being generated by the pressure and also a little rise from the radiated heat of the engine whilst driving normally. I would expect to see a higher than normal temp once the engine was shut down when at operating temp, then the fuel temp in the rail would rise as well due to the hot engine, and I would only be conscious of this rise because the fuel temp sensor is in the fuel rail. I would be curious of the results if you should look into this in more detail so please post your findings.
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11th Feb 2012 1:03pm |
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