[octalon7]

Been happy with the performance? Did you have any issues with SES codes before the tune? Injector, SCR, etc. How about after the tune?

I've been told some tunes will basically resolve the random SES codes. Not sure if that's because the software is coded that way, it's a result of swapping a DDE or reprogramming it, or maybe just not true.

[dmanb2b]

The tune should only tune out SCR or EGR related codes. I would not wan't to run a tune that doesn't show injector codes, maf related codes, etc.

[octalon7]

Originally Posted by dmanb2b

The tune should only tune out SCR or EGR related codes. I would not wan't to run a tune that doesn't show injector codes, maf related codes, etc.

Makes sense, was moreso thinking if the tunes are adjusting fuel injection values that maybe some of the seemingly bogus injector related codes might not show up any more.

[Thecastle]

The car shouldn't be throwing an SES code unless something is actually wrong. If your experiencing SES's you have something not working as it should.

Regardless, there is a JBD piggy back that is inexpensive and will add power. With the added bonus of being very easy to add and remove, and emissions compliant. In addition its after market warranty/extended warranty friendly.

Then you have your DDE tunes, which are not as easily reversible, but you could have two DDE's and swap between a stock tune and stage 1/2 tune as needed. I have such a setup but have never gone back to stock. Not even 1x.

[octalon7]

There are several threads here where some of us are in hunting game to find "what is wrong". My car in particular exhibits no operating issues yet is throwing codes even after following a typical diagnosis path. At this point just starting to wonder if it is the DDE. Which prompted this post to see if anyone who had similar issues and swapped to a tuned DDE with stock emissions still saw similar codes.

[Kengineer]

I understand people wanting to keep their emissions stock for various reasons. I have kids and want to hand this planet off to them in somewhat decent shape. I also ride bicycles and know what it's like when a diesel without a DPF or CAT blast you with diesel fumes.

The thing is with our cars, keeping the EGR is not good for the long term reliability of the vehicle as anyone who has personally done a carbon intake cleaning on an M57 knows too well. I don't think I can over state how much happier my car was after I disconnected its ass from its mouth (i.e. deleted the EGR).

If you're going to spend the $$ on a tune I would HIGHLY recommend ditching the EGR.

[Persian Whisperjet]

Is there any downside -- other than a small power and mileage penalty -- to replacing the EGR with a racepipe, hogging out the SCR catalyst, and leaving the DPF intact, along with the appropriate tune? I just got a second car and the fine lady who will be driving it is none too pleased with the stench that emanates from the Whisperjet. The alternative would be one of Matt's catted downpipes, but I'm guessing the smell reduction will be greater with the DPF in place (and no soot).

[apexit4]

Originally Posted by Persian Whisperjet

Is there any downside -- other than a small power and mileage penalty -- to replacing the EGR with a racepipe, hogging out the SCR catalyst, and leaving the DPF intact, along with the appropriate tune? I just got a second car and the fine lady who will be driving it is none too pleased with the stench that emanates from the Whisperjet. The alternative would be one of Matt's catted downpipes, but I'm guessing the smell reduction will be greater with the DPF in place (and no soot).

No downsides as far as I am aware of. Two things to note though:

1) Most tunes for the 335D actually increase gas mileage. You shouldn't be seeing a penalty.
2) Regarding the EGR, if you get a tune that eliminates the EGR then there is no "real" need to get a race pipe since it's functionality has been edited out of the software. You can run the tune and keep the EGR parts installed. IIRC, the race pipe cleans up the air flow into the intake, which has a positive effect on gas mileage and power delivery. You should be able to run without it though.

[octalon7]

My state does have emissions testing (albeit it's electronic, not sniffer), so I've always felt it would be good to keep the equipment in place.

Still doing some thread searching, but the EGR replacements or block off plates, all require some sort of tune, correct?

[robnitro]

If not tuned, blocking egr will give you a code and you will fail obd readiness for inspection. There is an electronic way of deleting which al so throws a code but causes no issues with other things like power or regen and is easily reversible.

[octalon7]

Originally Posted by robnitro

If not tuned, blocking egr will give you a code and you will fail obd readiness for inspection. There is an electronic way of deleting which al so throws a code but causes no issues with other things like power or regen and is easily reversible.

Thank you, so can't quite do anything there unless the codes are also tuned out.

[335dlci]

And if you're tuned. You probably won't pass OBD in most states......

[octalon7]

Originally Posted by 335dlci

And if you're tuned. You probably won't pass OBD in most states......

I've heard differently.

[apexit4]

Originally Posted by octalon7

I've heard differently.

I have heard differently as well. Although my state doesn't do emissions for diesels, it was my understanding that these types of tunes usually are smart enough to pass emissions. I can't imagine the tuners would willfully design the tune and not take into consideration whether they would pass emissions.

[dmanb2b]

Originally Posted by apexit4

I have heard differently as well. Although my state doesn't do emissions for diesels, it was my understanding that these types of tunes usually are smart enough to pass emissions. I can't imagine the tuners would willfully design the tune and not take into consideration whether they would pass emissions.

some won't pass, some charge extra for readiness and some do not

[apexit4]

Originally Posted by dmanb2b

some won't pass, some charge extra for readiness and some do not

Hmm, that's quite interesting. Do you have any links to the ones that charge extra for these things?

[dmanb2b]

Originally Posted by apexit4

Hmm, that's quite interesting. Do you have any links to the ones that charge extra for these things?

Nope and I highly doubt anyone would list that on a website, have to speak with tuner directly.