March 3, 2017

DPF & EGR Deletes




EGR Valve Delete/RemovalThe EGR valve (Exhaust Gas Recirculation) is an emission control device designed to reduce NOx emissions to help towards the ever more stringent Euro Emission Regulations. Celtic Tuning EGR Delete and EGR bypass software is designed to remove the functionality of the EGR valve to ensure it removes the running issues associated with these devices.



  • The EGR Valve creates a loop back from the exhaust manifold to the intake manifold to recirculate burnt gases.
  • The EGR valve has a solenoid which controls the valve which in turn is controlled by the ECU.
  • The ECU operates the solenoid by using a duty request cycle in order to open the valve and recirculate the burnt gases.
  • The Manifold Absolute Pressure sensor is then used to record the amount of additional gas which subsequently feeds back to the ECU as a control measure.



As the EGR valve is constantly working with burnt exhaust gases they naturally have high soot content. This soot in the gases causes a build-up of carbon deposits around the valve operation area which in turn causes the valve to have a tendency to stick in various positions. For full engine performance the EGR valve is closed which creates a closed loop environment for the turbo system which allows it to pressurise. A problematic EGR can create an open loop environment for the turbo as it provides a feedback straight to the intake manifold and as a result can cause boost issues along with huge reductions in power and also fuel economy!



Take a look at the Dynamometer chart, it is for a Peugeot 308 1.6 HDI 110bhp Euro 4 variant. The Run 1 is before the blanking plate was fitted and Run 2 is after fitment and just the EGR turned off so no MIL lights will appear on the dash. 

You can see that peak figures have increased by 13bhp and 25lbft which is a huge loss in performance. If you look at 3,000rpm you can see losses at their highest of approximately 22bhp and 40lbft.


tick Restored Engine Power
tick Restored MPG
tick Cleaner emissions as faulty EGR’s create much higher soot deposits
tick Can prevent DPF failure as the soot is caught in the DPF trap
tick Can prevent EGR replacement which can cost hundreds of pounds
tick Still 100% MOT compliant

Having your EGR Delete software can save you money in repairs and in fuel costs. Celtic Tuning are at the forefront of EGR Removal and EGR Bypass software and can correctly remove the functionality from the software of most ECU types. Some companies will simply turn off the codes associated with it being unplugged but this is not the correct way. The EGR valve needs properly disabling to ensure it is not trying to recirculate exhausts gases whilst still physically working in the engine.


The Areas we cover:

Celtic Tuning- Kent Authorised Dealer, covering all areas in the South East of England including: Gillingham, Rainham, Strood, Gravesend, Rochester, Dartford, Maidstone, Sevenoaks, Sittingbourne, Faversham, Canterbury, Ashford and the Medway Towns.