Quote:
Originally Posted by oil pan 4
For every degree (F or C it doesn't matter) you increase intake air temp your EGT see the same increase.
With DPF you need as much EGT as you can get to burn off the soot, I wouldn't be surprized if some diesels fired up their intake heater to help burn off the DPM.
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According to
this site, normal exhaust gas temperatures in a turbodiesel are above 200°C, natural regeneration of the DPF happens at 400°-500°C, while 500°-600°C is needed for forced regen. Many things are done to get EGT that high, among them is warming of the intake air. Euromodder mentioned that a heater in the air filter box may be responsable for the higher temps in his intake he sees during regen.
Some TDs also have an
intercooler bypass valve keep the post-turbo air warm, and sometimes restrict the intake to allow more EGR into the cylinders.
But this is all for DPF regen, not "normal" operation, so emissions in this case are more important than fuel consumption.
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