12-17-2020, 06:57 PM | #1 |
Captain
580
Rep 844
Posts |
exhaust notes doesn't sound right anymore
-bm3 stage 2 acn 91
-fabspeed 200 cell hjs downpipe (throws code now but turned off monitoring) -fi catback exhaust -vrsf 5" fmic + chargepipe -ngk colder plugs (replaced before summer due to engine chocking and burbles sound better after) ___________________________________________ Car doesn't sound as loud and solid and sharp as before. The burbles aren't as crispy and doesn't pop right. During cold start it isn't as loud and the engine note doesn't sound as crispy. I've used 100 octane mix before and full 100 octane with proper mapping. Also used e85 1 gallon mix and e30 map as well. Also with 200 cell cat gone bad throwing code will long term use of it being coded off cause any issues? Is maybe my cat being clogged causing these issues? I've done some bm3 datalogging and everything seems fine. Car isn't as enjoyable to drive anymore and would like someone knowledgeable to help please. Last edited by D CHOI; 12-22-2020 at 07:10 AM.. |
12-18-2020, 08:59 AM | #3 | |
Brigadier General
10904
Rep 4,537
Posts
Drives: 2015 328d xDrive
Join Date: Aug 2010
Location: NoVA
|
Quote:
https://f87.bimmerpost.com/forums/sh...5#post27017165 |
|
Appreciate
2
NYC Bimmer259.50 D CHOI580.00 |
12-18-2020, 02:54 PM | #5 |
Captain
580
Rep 844
Posts |
Thanks guys I will take a look at my cat and probably go catless because I've always thought the sound wasn't loud enough. Then swap back stock for smog. The bm3 turn off cat monitoring will not pass smog as that needs to be on.
This is my 2nd fabspeed dp as they warranty my 1st one. They don't seem to last a year for me and throws code...maybe because the way I drive with aggressive burbles and pops all the time. Also maybe some mix of e85 in the tank hurts the cat too? |
Appreciate
0
|
12-18-2020, 02:59 PM | #6 | |
Lieutenant Colonel
1717
Rep 1,899
Posts |
Quote:
|
|
Appreciate
4
|
12-18-2020, 07:59 PM | #9 |
Captain
580
Rep 844
Posts |
|
Appreciate
1
nioh_lbbm21716.50 |
12-19-2020, 01:00 PM | #10 |
Lieutenant Colonel
1717
Rep 1,899
Posts |
For what it's worth for anyone that comes across this thread,
I flashed back to stock tune recently to compare the REAL OEM burbles to BM3's supposed "oem" burble setting, and BM3's is still pretty aggressive. Don't think it'll be that safe in the long run. |
Appreciate
0
|
12-19-2020, 03:11 PM | #11 | |
Captain
580
Rep 844
Posts |
Quote:
OEM feels like a estimated copy of it. |
|
Appreciate
0
|
12-20-2020, 10:19 AM | #12 |
Captain
580
Rep 844
Posts |
hmm was wondering if maybe my ignition coils are bad and can cause this issue?
I didn't realize we have to replace them that soon especially for modded and I'm around 40k miles currently. |
Appreciate
0
|
12-21-2020, 01:26 PM | #13 |
Brigadier General
10904
Rep 4,537
Posts
Drives: 2015 328d xDrive
Join Date: Aug 2010
Location: NoVA
|
I think it's more likely your cat. I'd pull it and take a look before starting to replace things at random. If you're replacing your coils or plugs anyway then it obv wouldn't hurt to try and see if that makes a difference, but if you're just chasing this sound issue and don't have any drivability issues start with the cat and then go from there.
|
Appreciate
3
|
12-21-2020, 05:39 PM | #14 | |
Lieutenant
537
Rep 560
Posts |
Quote:
|
|
Appreciate
0
|
12-21-2020, 10:46 PM | #15 |
Private
46
Rep 38
Posts |
I am running this exact setup now. No codes.
Regarding sound. Here is a point of reference. Cold start with stock tune on 93. FWIW, I found the burbles with the BM3 stage 2 93 tune to be too aggressive (popping all the time), even with aggression set to 1, and have since disabled them completely. While it sounds like the DP is the issue. Is it possible your solenoid is not opening up the valves on the exhaust? They should fail open without the vacuum/tank but maybe it is a mechanical issue with the solenoid valve itself and you are stuck in a closed position. Last edited by cpow99; 12-21-2020 at 10:46 PM.. Reason: spelling |
Appreciate
1
D CHOI580.00 |
12-21-2020, 10:54 PM | #16 |
Private First Class
14
Rep 83
Posts |
A very easy way to check if the downpipe is the problem is to disconnect the exhaust just after the downpipe, give it few revs and see if the sound is loud or not.
|
Appreciate
0
|
12-22-2020, 07:03 AM | #17 | |
Captain
580
Rep 844
Posts |
Quote:
The only issue is now for smog I would have to swap back the stock cat. Bm3 turning cat monitoring off doesn't allow smog to be passed since cat monitoring needs to be on. Or unless I get a custom tune to bypass the perimeters. |
|
Appreciate
0
|
12-22-2020, 07:05 AM | #18 | |
Captain
580
Rep 844
Posts |
Quote:
|
|
Appreciate
0
|
12-22-2020, 01:31 PM | #20 | |
Private
46
Rep 38
Posts |
Quote:
FI customer service was great and would recommend. |
|
Appreciate
1
VisualEcho6625.50 |
12-23-2020, 01:25 AM | #21 |
Captain
580
Rep 844
Posts |
I was actually considering Remus too but ultimately went with FI because you can hear the turbo spool down more and the pops and bangs are more pronounced. But can't go wrong with either one.
|
Appreciate
0
|
12-23-2020, 01:29 AM | #22 | ||
Captain
580
Rep 844
Posts |
Quote:
|
||
Appreciate
1
cpow9946.00 |
Post Reply |
Bookmarks |
Thread Tools | Search this Thread |
|
|