DPF Delete / Removal

DPF Delete / Removal

BACKGROUND TO DIESEL PARTICULATE FILTERS (DPF)

DPF Filter Delete/Removal. 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 minimizing 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.

There are two types of regeneration:

  • Active DPF Regeneration Removal Passive DPF Regeneration Removal
  • ACTIVE DPF REGENERATION SYSTEM


When the soot loading in the filter reaches a set limit (about 45%) the ECU will initiate post combustion fuel injection to increase the exhaust temperature and trigger regeneration. If the journey is a bit stop/start or you take your foot off the accelerator while the regeneration is in progress, it may not complete and the warning light will come on to show that the filter is partially blocked.

PASSIVE DPF REGENERATION SYSTEM

Passive regeneration takes place automatically on motorway-type runs when the exhaust temperature is high. Because many cars don’t get this sort of use car manufacturers have to design-in ‘active’ regeneration where the engine management computer (ECU) takes control of the process.

A car which is primarily used for motorway use will generally run at warmer temperatures and therefore produce far less particulate matter than one used in a stop/start city environment. A vehicle used on the motorway is also going to be able to regenerate more often and effectively as it is in the perfect driving environment for the regeneration process to occur.

The operation of the DPF is controlled by the ECU and requires multiple signal feeds from various sensors in order to operate effectively. The most common type of DPF runs two pressure sensors and a varying number of temperature sensors. There is differential pressure sensor mounted in the engine bay which picks up the pressure both before and after the DPF. It is the variance in pressure between these two pick-ups which allows the ECU to calculate the percentage saturation of the DPF. Once the ECU establishes the saturation level it is able to force a regeneration cycle. The progress of the cycle is monitored by the temperature sensors and takes constant feedback from the differential pressure sensor which enables to know when the burn off process is complete..

PASSIVE DPF REGENERATION SYSTEM

A DPF delete removes a vehicle’s DPF and configures the computer system to function without it. While there are an endless number of kits available, there are two main components to any DPF delete: the exhaust and the tuner. The exhaust is used to physically replace the DPF, while the tuner disables the vehicle’s regeneration mode and ensures that no other engine codes come up.

 

PASSIVE DPF REGENERATION SYSTEM

A DPF delete removes a vehicle’s DPF and configures the computer system to function without it. While there are an endless number of kits available, there are two main components to any DPF delete: the exhaust and the tuner. The exhaust is used to physically replace the DPF, while the tuner disables the vehicle’s regeneration mode and ensures that no other engine codes come up. After installing a DPF delete kit, you’ll notice significantly increased horsepower and fuel economy. As an added bonus, you’ll add at least a few extra years onto your vehicle’s life. The team of experts at Turbocharger Services Africa has years of experience dealing with performance parts and installations for a wide assortment of vehicles. Contact our team today to learn more about how a DPF delete can benefit your vehicle.

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