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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Cobb Stage 1 + Down Pipe



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      12-24-2012, 08:15 PM   #1
ronny214
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Cobb Stage 1 + Down Pipe

Okay guys, so I have my new Cobb AP and I finally got the Aggressive map loaded on! I also have an AR 4" down pipe sitting in my closet waiting to go on the car as soon as I finish up some warranty work.

The only thing is that one of the guys over at Cobb recommended I not put the down pipe on my car if I'm running the Stage 1 maps. He suggested waiting until they have a map out made for down pipes.

I really want to put this on the car, but not if it causes issues. I do not see what issues could possibly be created, but would love to have some opinions before I go bolting it on.
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      12-24-2012, 09:16 PM   #2
fasteddie222
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I think the only issue you might have is the cel light can go off in your car because I dont think COBB deletes the code for aftermarket downpipes yet for the n55 if im not mistaken.
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      12-24-2012, 09:53 PM   #3
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The CEL will stay on your dash & the tune is not dialed in to maximize the gains of a catless DP. Ironically enough, you'd see more results with the current maps available with an aftermarket FMIC
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      12-24-2012, 09:54 PM   #4
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Quote:
Originally Posted by fasteddie222 View Post
I think the only issue you might have is the cel light can go off in your car because I dont think COBB deletes the code for aftermarket downpipes yet for the n55 if im not mistaken.
Mine threw a DP code today and it cleared the code without a problem though i didn't install any maps because my ECU isn't supported yet
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      12-24-2012, 10:51 PM   #5
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I would assume its for the lack of wastegate control with no cats where you could over boost. I tune Mazdaspeeds and I know that if you don't run the right maps with them the car loves to overboost and just run havoc. But theres a shit load of other reasons not to run the carless without the map because of fuel issues, timing, and shit whatever else.
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      12-27-2012, 11:31 AM   #6
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Originally Posted by I35it View Post
I would assume its for the lack of wastegate control with no cats where you could over boost. I tune Mazdaspeeds and I know that if you don't run the right maps with them the car loves to overboost and just run havoc. But theres a shit load of other reasons not to run the carless without the map because of fuel issues, timing, and shit whatever else.
Yes, overboost was the reason they mentioned when I was up at Cobb picking up the AP.
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      12-28-2012, 09:22 AM   #7
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Quote:
Originally Posted by ronny214 View Post
Yes, overboost was the reason they mentioned when I was up at Cobb picking up the AP.
Yea overboosting in these motors just seems like a horrible idea and with no cat and no tune would just make that turbo scream.
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      12-28-2012, 10:01 AM   #8
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Originally Posted by I35it View Post
Yea overboosting in these motors just seems like a horrible idea and with no cat and no tune would just make that turbo scream.
Guess my downpipe is gonna sit in the closet until cobb blesses us with a Stage 2 set of tunes Should've bought a FMIC first
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      12-28-2012, 10:06 AM   #9
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Quote:
Originally Posted by ronny214 View Post
Guess my downpipe is gonna sit in the closet until cobb blesses us with a Stage 2 set of tunes Should've bought a FMIC first
I would hope it wouldnt take to long for it to come out. I have my DP also sitting in my closet, been there for a while.
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      12-29-2012, 11:30 AM   #10
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Is over boost really an issue with our turbos on moderate boost levels? Could this also be an issue with a stock car + downpipe as the only mod?
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      12-30-2012, 01:05 AM   #11
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Maybe a stupid question for when Stage 2 is available.

So it's my understanding that we have to run (what will likely be) stage 2 to take advantage of DP and delete any codes due to catless. So what happens when we uninstall COBB for dealership visits? Will the car have CEL codes or anything?
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      12-30-2012, 05:17 AM   #12
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Quote:
Originally Posted by drallafi
Maybe a stupid question for when Stage 2 is available.

So it's my understanding that we have to run (what will likely be) stage 2 to take advantage of DP and delete any codes due to catless. So what happens when we uninstall COBB for dealership visits? Will the car have CEL codes or anything?
Yes, your ses light will go back on when you uninstall it
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