On an unmodified car with working EGR, the EGR is closed when you "make use of all the low down torque"...So i really dont understand how that should make a difference? Same goes for shifting into high much earlier, as EGR only opens on light/partial loads?
Totally agree about the health-state of engine when blanked, but is there any change of way engine runs, (Simulator must alter the signal for amount of air going to the ECU ), comparing to this simulator mounted & just blankingplate(s)....I know EML-light will come on, but car will still run with full power.
Yes, if the EGR system is all working correctly and the fuel mapping is balanced and within spec, then fitting an EGR blanking plate should not make any difference. However this is an economical solution that may fix many diesel cars that have a stutter. My car had a new EGR fitted and within 5,000km, the stutter was back. No matter what I tried, I couldn't get rid of it. Personally, I think that the parameters to inputs in the fuel map are set to tight and that the car cannot "learn" or correct itself to avoid the stutter. I admit that I don't fully understand how the inputs to the ECU all work and are balanced etc, but what I do know is that the EGR simulator and full blanking plate has cured the stutter in my car 100%.
Previously the stutter would appear between light and moderate throttle. So previously if you drove very lightly, no stutter. If you pushed the car hard, no stutter. But that light to moderate throttle position that is used so often would cause lot's of stuttering. EG. Accelerating away from round about, moderate throttle while accelerating in traffic, and cruising in 6th gear at lower revs. So I think the stutter is when the EGR is at partial open. Not fully closed or fully open. Unfortunately, I think that the EGR partial opening scenario happens quite often. So fixing this issue makes the car so much more pleasant to drive. If you are after a horsepower or torque increase, then I would expect the EGR simulator would make very little or no difference. But what it does do is allow you to use what is already there in a progressive way.
I do not know, but this is how I suspect that the EGR simulator works. The ECU is expecting a pre-dertimined additional volume of air based on the % EGR opening. The MAF sensor measures the volume of air coming from the air box and the MAP sensors measure manifold pressure after the EGR addition. If the ECU gets and imbalance between what it is expecting as a MAP reading based on various inputs and the theoretical volume of air from the EGR, I think this is what causes the stutter. So I suspect that what the EGR simulator does is adjust the volume of air signal from the MAF sensor by what it would normally expect from the EGR input, thereby eliminating the imbalance. I may have the logic totally wrong, however I suspect that I'm not far away. Maybe there is someone else on the forum who does actually know how the sensors and EGR system all links together, but what I do know that it has fixed the stutter in my car.
It may not fix everyones stutter issues as there maybe other forces at play, but all I can offer is that it worked for me.