N54 “Superknock”

ESmotorsports · Yesterday, 07:24 PM

Hello! I want to start off prefacing, I am an N54 newbie. So I apologize for any stupid questions.
But I recently bought a 335i n54 and I did the classic intakes, CP, FMIC, stage 1+ MHD. 91 OCT
I also installed new Endor coils and 1 step colder plugs.

Today I installed catless Downpipes and flashed MHD 2+ 91 OCT
Car sounds great and runs great.
The issue i am having is, at WOT around 5-6k the revs stutter ever so slightly and MHD is showing a “super knock” shadow code.
I cleared the code and tested multiple times. And the super knock code moves seemingly randomly between cylinders. First time it was cyl 5. Then cyl 6 and cyl 2.
I flashed back to Stage 1+ it’s having the same issue. Superknock shadow code for cyl 1 this time.

If I drive the car sporty, but dont go WOT to 6.5k, the car doesnt throw the Superknock code. Even when revving the car out to 6.5k at 70% throttle does not cause the code. It’s only happening WOT and high rpms.

The car drives amazing, and I dont hear or feel any misfiring. Just the minor stutter in the revs and the codes so I just dont understand what’s going on

lowrydr310 · Yesterday, 10:19 PM

Flash "Stage 0" (no tune but MHD stays installed, easy and fast) then do a proper log and post the file here. We need to see your fuel pressure.

It could also be injectors, or maybe something simple as carbon build up.

lookalikehuuh · Today, 02:21 PM

Have you grabbed a log to see what your timing corrections look like? Also what fuel are you using?

ESmotorsports · Today, 02:49 PM

Quote:

Originally Posted by lowrydr310

Flash "Stage 0" (no tune but MHD stays installed, easy and fast) then do a proper log and post the file here. We need to see your fuel pressure.

It could also be injectors, or maybe something simple as carbon build up.

Thabks for the reply. Here is the request Stage 0 Log.

https://datazap.me/u/es335/stage-0?log=0&data=3-21

ESmotorsports · Today, 02:51 PM

Quote:

Originally Posted by lookalikehuuh

Have you grabbed a log to see what your timing corrections look like? Also what fuel are you using?

I am using 91 because we dont get 93 where I live.

https://datazap.me/u/es335/stage-0?log=0&data=3-21

Yesterday, 07:24 PM	#1
ESmotorsports New Member 0 Rep 6 Posts Drives: e92 335i Join Date: Jun 2024 Location: Oklahoma iTrader: (0)	N54 “Superknock” Hello! I want to start off prefacing, I am an N54 newbie. So I apologize for any stupid questions. But I recently bought a 335i n54 and I did the classic intakes, CP, FMIC, stage 1+ MHD. 91 OCT I also installed new Endor coils and 1 step colder plugs. Today I installed catless Downpipes and flashed MHD 2+ 91 OCT Car sounds great and runs great. The issue i am having is, at WOT around 5-6k the revs stutter ever so slightly and MHD is showing a “super knock” shadow code. I cleared the code and tested multiple times. And the super knock code moves seemingly randomly between cylinders. First time it was cyl 5. Then cyl 6 and cyl 2. I flashed back to Stage 1+ it’s having the same issue. Superknock shadow code for cyl 1 this time. If I drive the car sporty, but dont go WOT to 6.5k, the car doesnt throw the Superknock code. Even when revving the car out to 6.5k at 70% throttle does not cause the code. It’s only happening WOT and high rpms. The car drives amazing, and I dont hear or feel any misfiring. Just the minor stutter in the revs and the codes so I just dont understand what’s going on
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Yesterday, 10:19 PM	#2
lowrydr310 Robot 1897 Rep 2,331 Posts Drives: 2006 330i, 2007 E93 335i Join Date: Apr 2013 Location: Souhtrne Califniora iTrader: (0)	Flash "Stage 0" (no tune but MHD stays installed, easy and fast) then do a proper log and post the file here. We need to see your fuel pressure. It could also be injectors, or maybe something simple as carbon build up.
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Today, 02:21 PM	#3
lookalikehuuh Major 924 Rep 1,443 Posts Drives: 2006 330i, 2007 335i Join Date: Sep 2014 Location: San Diego, CA iTrader: (0)	Have you grabbed a log to see what your timing corrections look like? Also what fuel are you using?
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