BELOW IS AN EXPLANATION OF THE EXHAUST RECIRCULATION (EGR) SYSTEM.
So, why do we have it?
The EGR System is A simple and problematic emissions reducing device specifically introduced to reduce NOx emission. When the combustion gasses heats up excessively, nitrous oxide NOx is produced.
To reduce the production of NOx, the engine's combustion temperatures needs to be reduced and the EGR system allows recirculated exhaust gas back into the inlet side of the engine. This is a continuous process and the EGR valve remains open on cruise and all the way up to just before wide open throttle. At wide open throttle (WOT) emissions are not tested and so manufacturers close the valve and allow a full shot of fresh air to allow the engine to develop max power.
Some EGR applications can have the mapping of the valve changed to reduce the actuation, but most simply choose to the valve at WOT.
Blocking the EGR system gives us two main benefits.
1) Blocking the EGR will certainly stop the soot from the exhaust clogging up the inlet manifold.
2) When blocking the EGR port you are redirecting the exhaust gases back out via the turbo, (where it was meant to go). The turbo now has more pressure turning the blades and the turbo will spool quicker. Most people will even be able to feel this by the "seat of their pants" dyno. ie you will feel a marginal increase in performance and that's a good thing. Variable Vane Turbo Charges are also OK with blanking the EGR.
EGR systems ARE NOT in place to help keep the engine from getting hot. This is a myth. The reduction of combustion temps is PURELY an emissions system. This is proven from the fact that at WOT, when the engine would need to most cooling, the EGR system is CLOSED.
Yes, the engine is producing more NOx emissions however the reduced throttle position (because of EGR blanking) means you will be using less diesel and producing less soot or particulate matter (PM).
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EGR Blanking Plate for Toyota D4D's
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