 | Home > Puma (Tdci) > DPF Regen VERY often |
 
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| Ianh Member Since: 17 Sep 2018 Location: Essex Posts: 2087  
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Just thinking on the temperatures created at the inlet to the DPF during active regeneration. Being 600 degrees C , and noting the turbo is between the exhaust manifold and the DPF, I expect that greater than 600 C now hits the turbo.
All that heat is then transferred to the air coming from the air intake at the turbo, which then heads to the intercooler. Therefore during active regeneration the intercooler on a 2.2 is dealing with air at least 100 degrees c above what a it would experience from a 2.4, yet the same intercooler is used. Having recently fitted a BAS intercooler and silicon hoses I have found a noticeable better engine performance, noting I have not as yet modified my air intake. Now I thought that must be a placebo effect, or maybe because I replaced a failing std intercooler. But I’m now thinking it’s because the BAS intercooler handles that extra 100 c much better and therefore performance is actually is better. Food for thought for 2.2 owners, especially in hot climates. |
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22nd Apr 2022 1:03pm |
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| jpboost Member Since: 13 Apr 2021 Location: Gatwick Posts: 377 
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I understood that the increased temperatures are within the DPF itself? I agree that anything (very) hot in the engine bay impacts the inlet path to a certain extent, but I'm not sure I follow the logic that this will lead to significant increased in inlet temps. The turbo doesn't transmit all it's 'hot side' heat into the inlet charge.
Doesn't the DPF regen only occur when in a low load, steady state? At this point you would expect IAT's to be low, and the intercooler function to be much less needed. It would be interesting to monitor IATs during a regen cycle and then compare them to the IATs when driving hard. I suspect the intercooling is much more of a concern when working the turbo than in any other scenario. The exhaust and turbo on both 2.4 and 2.2 will be at times be right up there at similar temperatures anyway. I don't know enough about the Puma lump to know what typical EGTs are for these under load, but I would expect them to be up in the 500-600C range. I'm sure someone who knows more than I do will be able to confirm. |
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22nd Apr 2022 4:16pm |
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| Ianh Member Since: 17 Sep 2018 Location: Essex Posts: 2087
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Thanks jpboost. From reading the details on how this operates on the first page of this topic my understanding is the increased temperatures are initially in the cylinder to create the right temperature exhaust gases. If they do not reach the 600c at the DPF inlet additional fuel is injected to create a reaction in the cat to get the temperature to 600C. So the exhaust gas’s in the turbo will be 600 C sometimes, and a bit lower others. This will be the case for circa 20 minutes every 250 miles, or less miles if more slower shorter journeys take place. I.e urban driving.
I agree that not all that temp in the turbo will be transmitted to the intake charge. However a proportion of the heat will be transmitted and if that’s a constant it’s relative to the turbo temperature and therefore it will transmit more heat in a 2.2 than in a 2.4 as the 2.4 does not have to raise exhaust gases to this temp. Hence I’m deducting the intercooler on the 2.2 is having to deal with hotter air from the 2.2 than from the 2.4 during active regeneration. All this is me just thinking it through based on reading how the process works on page one of the topic, then wondering if having a higher performing BAS intercooler provides additional noticeable benefits to a 2.2 during active regeneration. I expect someone like Pete bell at BAS would know  |
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23rd Apr 2022 11:40am |
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