Hi all.

Just coded down my EGR valve using VAG COM on my Fabia VRS.... changed it so the setting now reads 350 mg/stroke rather than 250.

I went for a drive and it seemed to eliminate the "stutter" you get with a dragon box at around 1800rpm in 2nd gear when accelerating, also seems less smoky and a bit smoother drive.

Are there any downsides to doing this apart from it kicking out more NOx?

not that I've heard of...

Bas

surely 350mg per stroke is more than 250mg so you are putting more in or have i missed something?

I think you've missed something

01 - Engine]

[Login - 11] and enter 12233 as the access code

[Adaptation] and go to block 3.

Give the accelerator pedal a quick "blip" to ensure that the EGR remains turned on for the next minute while you perform the following steps.

Note that the display shows a default adaptation value of 32768 and shows approximately 250 +/- 20 mg/stroke of air intake volume.

If all is well, enter 33768 as the new adaptation value, and select "test". Note that the displayed air intake volume changes, usually to about 370 mg/stroke. The specification limit is 370 mg/stroke, so if you want to remain within OEM shop manual specifications for emission control reasons, you might have to enter a number slightly smaller than 33768. (If you don't care about road-legal NOx emission limits then leave it at 33768. [Depending on the usage cycle, NOx at this setting can be increased by as much as 40%]) If all is well and you have a setting that you are happy with which results in an intake air volume of 370 mg/stroke or just a hair less, enter [save]. The values aren't exactly the same, but when you enter the value 33768, the ECU will automatically adapt it. In my case it was something like 33628. 370mg/stroke is what your looking for.

The only downside that I know of is that temperatures in the cylinder will be higher...

Chris