Amos wrote:

Then why do Landrover use it..... Thet don't put thing in engines, so the owner can block it up 2 weeks latter....

dgardel wrote:

The EGR valve recirculate, in same engine rpm, Temp, and load conditions, controlled part of exhaust gases to the inlet manifold.

In this way the engine run with lower combustion temperature and produce less NOx
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In modern diesel engines, the EGR gas is cooled through a heat exchanger to allow the introduction of a greater mass of recirculated gas. Unlike SI engines, diesels are not limited by the need for a contiguous flamefront; furthermore, since diesels always operate with excess air, they benefit from EGR rates as high as 50% (at idle, where there is otherwise a very large amount of excess air) in controlling NOx emissions.
Since diesel engines are unthrottled, EGR does not lower throttling losses in the way that it does for SI engines (see above). However, exhaust gas (largely carbon dioxide and water vapor) has a higher specific heat than air, and so it still serves to lower peak combustion temperatures. There are trade offs however. Adding EGR to a diesel reduces the specific heat ratio of the combustion gases in the power stroke. This reduces the amount of power that can be extracted by the piston. EGR also tends to reduce the amount of fuel burned in the power stroke. This is evident by the increase in particulate emissions that corresponds to an increase in EGR. Particulate matter (mainly carbon) that is not burned in the power stroke is wasted energy. Stricter regulations on particulate matter(PM) call for further emission controls to be introduced to compensate for the PM emissions introduced by EGR. The most common is particulate filters in the exhaust system that result in reduced fuel efficiency. Since EGR increases the amount of PM that must be dealt with and reduces the exhaust gas temperatures and available oxygen these filters need to function properly to burn off soot, automakers have had to consider injecting fuel and air directly into the exhaust system to keep these filters from plugging up.

EGR deletion
EGR deletion in diesel engines is considered justifiable by a wide range of people, including the environmentally conscious. Although deleting the EGR system results in increased NOx level; hydrocarbon emissions, particulates, carbon monoxide and carbon dioxide are drastically reduced. Furthermore, EGR deletion results in an increase in fuel economy as high as 25%. Exhaust gas recirculated back into the cylinders adds wear-inducing contaminants and causes an increase engine oil acidity, which can result in an inefficient, poorly running engine. The increased level of soot also creates the need for diesel particulate filters to prevent environmental contamination.

BIGFOG wrote:

Bring on the German Bloke!

Red Desert wrote:

software patch

K9F wrote:

from a personal perspective and for anyone with any type of reprogrammed ECUs I would much rather have an engineering solution to the EGR Valve blanking than a software patch that may be incompatable with the remap.

V2NGT wrote:

Hi All ,

I have just added an EGR blanking plate to my Puma ,
Size used was 12 mm so far without issues .
job is a little fiddly due to access even though there are only 3 bolts to remove/replace . Removing the bonnet helps as does using a tapered nail punch to realign the holes .

What wasn't clear to me was the difference a blanking plate would make, it truly is a new engine far quieter and less "agricultural" than before , if any of you are suffering a dead spot/lag when first applying throttle then this will remove virtually all of the hesitant response .

EGR plate was from Bell Auto Services and arrived the next day in a range of sizes , Fantastic

Hi V2NGT,
Your spec, short of the dampers is identical to mine albeit on a 110. I have just got the Tornado exhaust on in the last couple of days. Is yours including a de-cat or cat back? The reason I ask is that Andy of Allisport reported problems with his car after fitting the de-cat and has since removed it and put the original cat back to cure the issue.
Would be interested to hear your side.