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DPF Delete/Reprogramme

BACKGROUND TO DIESEL PARTICULATE FILTERS (DPF)

The exhaust emissions standards for new cars have effectively required fitment of a DPF in the exhaust of diesel cars since 2009 when the 'Euro 5' standard came into force. In fact, many cars registered before 2009 will have had one fitted too in anticipation of the change in standards. Standards aim to deliver an 80% reduction in diesel particulate (soot) emissions but as owners are finding out with great expense, the technology is not without its problems.

HOW DO THEY WORK?

The DPF looks similar to a traditional exhaust silencer, but is mounted close to the engine. Inside is a complex honeycomb ceramic structure designed to filter the exhaust gases while minimising flow reduction (which would otherwise limit performance). By forcing the exhaust gases through the walls between the channels of the DPF, the particulate matter is deposited on the walls, so reducing the amount of air pollution. Once the DPF reaches a certain level of ‘Saturation’ it performs a regeneration cycle to burn off the particulate matter inside the filter.

DPF TYPES

ACTIVE DPF REGENERATION SYSTEM

PASSIVE DPF REGENERATION SYSTEM

COMMON CAUSES FOR DPF FAILURE

There are a multitude of reasons a DPF can fail, the most common are highlighted below:

  • High mileage and compacted with fine soot.
  • Failed sensors preventing DPF regeneration.
  • Lack of additive in fuel (where fitted) causing incomplete burn off.
  • Engine issues i.e. leaking injector, valve stem oil seals, worn piston rings.
  • DPF unable to regenerate due to driving conditions i.e. City centre.
  • Poor performance tuning.
  • Driving in too low of a gear on a motorway disallowing the regeneration to commence.

CONTACTS

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P.O BOX 9081 - 00300 Nairobi, Kenya.

Call us on +254 732 888 000 or +254 732 888 001

Email: info@turbo-services.com

          turbopratt@gmail.com

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