[ESmotorsports]

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]

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]

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

[ESmotorsports]

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]

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

[suspect]

In my opinion you have some bad fuel.

[ESmotorsports]

Originally Posted by suspect

In my opinion you have some bad fuel.

Should I start trying e85 blend?
Or should I hunt down 93?

I have read lots of good things about e85 blends. I just dont want damage my injectors or fuel pumps.

[lowrydr310]

The most you can run without exceeding the capacity of your HPFP is E40 and that's assuming a perfectly healthy fuel pump and injectors. I would suggest not trying any high ethanol tunes yet until you sort this out. Even with 91 octane on stage 0 you should not see timing corrections like that.

I'm on a mobile phone and can't see all the datazap log data easily, but nothing looks too bad. Wonder what's causing those timing corrections. Have you had a walnut blast done?

I have similar timing corrections even on a tank of 101 octane with Stage 0 MHD, though I have some big differences between bank 1 and bank 2 fuel trims that I'm trying to sort out. I had a walnut blast done by a reputable shop, well I paid for it at least. I had the manifold off a few weeks after and I didn't get a good look at my intake valves but they were still very black and very wet. Makes me wonder if they didn't do a walnut blast but just sprayed some solvent cleaner on them.

[335i54n]

thats not a very good log, need a steady wot gear pull but with your superknock issue, kinda tough. looks a little lean with major timing corrections. as always i would baseline compression test it 1st. what are your injector index? i would pull your plug and check color

[ESmotorsports]

Originally Posted by 335i54n

thats not a very good log, need a steady wot gear pull but with your superknock issue, kinda tough. looks a little lean with major timing corrections. as always i would baseline compression test it 1st. what are your injector index? i would pull your plug and check color

What do I need to do differently to improve the logs?

[ESmotorsports]

Originally Posted by lowrydr310

The most you can run without exceeding the capacity of your HPFP is E40 and that's assuming a perfectly healthy fuel pump and injectors. I would suggest not trying any high ethanol tunes yet until you sort this out. Even with 91 octane on stage 0 you should not see timing corrections like that.

I'm on a mobile phone and can't see all the datazap log data easily, but nothing looks too bad. Wonder what's causing those timing corrections. Have you had a walnut blast done?

I have similar timing corrections even on a tank of 101 octane with Stage 0 MHD, though I have some big differences between bank 1 and bank 2 fuel trims that I'm trying to sort out. I had a walnut blast done by a reputable shop, well I paid for it at least. I had the manifold off a few weeks after and I didn't get a good look at my intake valves but they were still very black and very wet. Makes me wonder if they didn't do a walnut blast but just sprayed some solvent cleaner on them.

The cars never had any intake valve cleaning. It’s at 41,000 miles. So that is next on my list for sure.