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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > Tune with DPF only



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      06-17-2020, 02:34 AM   #1
Blackdog76
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Tune with DPF only

Looking around for a tuner that can turn off EGR, and delete SCR DEF so I can run a DPF back exhaust. Iím in California and was considering a full exhaust but decided against it because of the smell and noise. Then I was considering gutting the DPF except for the cat but I still need an intact DPF to pass emissions testing. I also donít really want to take the DPF on and off because itís a real bitch. Iíve spoken to all the tuners on here and nobody has a clear answer for what Iím looking for. BRR doesnít do partial deletes. Malone said they can do a 2.5 tune but at my own risk. Not going with a JBD again so please donít even mention it. Any thoughts?
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      06-17-2020, 11:31 AM   #2
e90Noobie
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I've done a lot of research on these cars and I still have yet to see someone else retain only the DPF. Seems to be that the only two options are deleting only the EGR or a full system delete. Either way you will still fail emissions testing because with any of the three systems tuned out the readiness monitors will always show as NOT READY.

I suggest you find a way to pass emissions and delete the whole system. Man up about the "noise and smell" and think of it as POWER
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      06-18-2020, 04:18 AM   #3
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Quote:
Originally Posted by e90Noobie View Post
I've done a lot of research on these cars and I still have yet to see someone else retain only the DPF. Seems to be that the only two options are deleting only the EGR or a full system delete. Either way you will still fail emissions testing because with any of the three systems tuned out the readiness monitors will always show as NOT READY.

I suggest you find a way to pass emissions and delete the whole system. Man up about the "noise and smell" and think of it as POWER
Iíll work on my manhood but the whole point of leaving the dpf in place and going with a tune is being able to swap everything after it with ease, to go back to stock.
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      06-18-2020, 12:55 PM   #4
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Well if the urea in the DEF system is just sitting stagnant for two years at a time it will probably crystallize.
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      06-18-2020, 05:06 PM   #5
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Tuning a 335D with a DPF in place is an exercise in futility. I'm not saying it can't be done, but the service life on that DPF will be cut by anywhere from 50 to 90%, depending on how hot you go.
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      06-18-2020, 06:16 PM   #6
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Quote:
Originally Posted by Nadir Point View Post
Tuning a 335D with a DPF in place is an exercise in futility. I'm not saying it can't be done, but the service life on that DPF will be cut by anywhere from 50 to 90%, depending on how hot you go.
This ^

Just delete it... you won't regret it. You'll probably have an easier time finding a buyer with it deleted vs not deleted too
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2011 335d deleted and tuned by B.R.R.
2011 X5 35d stock for now...
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      06-20-2020, 05:05 AM   #7
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In the USA you guys usually do a bunch ok miles on autobahn, I don’t see a problem to tune the car with the dpf on. If the tune is correctly done you will get same amount or less ash than stock into your dpf.

I don’t know exactly how do they test the smog in the USA but it should be ok Removing dpf if you keep the rest of the exhaust stock.

If the tuner knows how to, the readiness can appear ready.

Another trick is to drill 2 inch holes into the dpf internal ceramic.

Hope It helps.
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      06-25-2020, 06:58 PM   #8
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Quote:
Originally Posted by Drews2k View Post
In the USA you guys usually do a bunch ok miles on autobahn, I donít see a problem to tune the car with the dpf on. If the tune is correctly done you will get same amount or less ash than stock into your dpf.

I donít know exactly how do they test the smog in the USA but it should be ok Removing dpf if you keep the rest of the exhaust stock.

If the tuner knows how to, the readiness can appear ready.

Another trick is to drill 2 inch holes into the dpf internal ceramic.

Hope It helps.

I removed the EGR and had it tuned out and I have soot in my tail pipes now. Who knows what the hell is going on.
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      06-26-2020, 10:06 PM   #9
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Find a county where you can renew registration sans smog. In other words do a full delete and get a catted exhaust.
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