[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.

[suspect]

Originally Posted by ESmotorsports

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.

I don't know much about ethanol blends but you need to get the octane up to try and eliminate the problem. I don't see anything wrong with adding a little ethanol. Are you sure someone hasn't filled it with lower grade fuel by mistake?

https://www.e90post.com/forums/showthread.php?t=1611547

You also have numerous throttle cuts and stft are very negative, I think -30% is the most it can cut. Any rough starting issues? Also why is your IAT so high? What is the outside temperature?

[lookalikehuuh]

Originally Posted by ESmotorsports

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

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

man... there are some definite issues going on here. You have timing corrections galore here. Car is pulling fuel galore, nearly hitting the limits of the STFT which is +/-34% and you are hitting -33.1% here.

I would start by changing out the spark plugs back to the OE Bosch plugs, you don't need colder plugs until you have upgraded turbos AND I have seen issues caused by the colder plugs when not running hybrid turbos. My car also had weird corrections when I had 2 step colder NGKs.

Also where did you source your parts? I wonder if you got knockoff NGK spark plugs... what did you gap the plugs to? Ensure you get them from a reputable source like FCP Euro, Turner Motorsports, Pelican Parts, etc.

I might consider completely removing MHD (not just stage 0) until you resolve this issue since you can definitely cause some major damage to the engine which this is going on.

Where did you fuel up because I also suspect there is something going on with the fuel in your car, there is literally timing corrections on every cylinder throughout the entire run. I personally stick to Shell or Chevron exclusively to reduce the likelihood of low quality fuel. How available is E85 in your area? 3 gallons (which would be about E23-25ish, assuming your E85 is 80% ethanol) of E85 could boost your octane a couple of point which could tell us if fuel quality is your issue.

[ESmotorsports]

Originally Posted by lookalikehuuh

man... there are some definite issues going on here. You have timing corrections galore here. Car is pulling fuel galore, nearly hitting the limits of the STFT which is +/-34% and you are hitting -33.1% here.

I would start by changing out the spark plugs back to the OE Bosch plugs, you don't need colder plugs until you have upgraded turbos AND I have seen issues caused by the colder plugs when not running hybrid turbos. My car also had weird corrections when I had 2 step colder NGKs.

Also where did you source your parts? I wonder if you got knockoff NGK spark plugs... what did you gap the plugs to? Ensure you get them from a reputable source like FCP Euro, Turner Motorsports, Pelican Parts, etc.

I might consider completely removing MHD (not just stage 0) until you resolve this issue since you can definitely cause some major damage to the engine which this is going on.

Where did you fuel up because I also suspect there is something going on with the fuel in your car, there is literally timing corrections on every cylinder throughout the entire run. I personally stick to Shell or Chevron exclusively to reduce the likelihood of low quality fuel. How available is E85 in your area? 3 gallons (which would be about E23-25ish, assuming your E85 is 80% ethanol) of E85 could boost your octane a couple of point which could tell us if fuel quality is your issue.

Thanks for the reply,
The plugs came from FCP and are gapped to .22.
E85 is pretty accessible. 93 is nearly impossible to come by.

[lookalikehuuh]

Originally Posted by ESmotorsports

Thanks for the reply,
The plugs came from FCP and are gapped to .22.
E85 is pretty accessible. 93 is nearly impossible to come by.

What station did you fill up previously?

[ESmotorsports]

A local station named “IB’s”
I had been fueling there because its supposed to be Philips 66 Top Tier

[lookalikehuuh]

Originally Posted by ESmotorsports

A local station named “IB’s”
I had been fueling there because its supposed to be Philips 66 Top Tier

yeah..... for the record Arco is also a "top tier" fuel... it is not a fuel I would ever run in my car.

Anyway when tuned make sure you stick to goo quality fuel sources. I personally prefer shell or chevron, but I have filled up at a Mobil when in a pinch. I avoid all others like the plague.

[ESmotorsports]

Thanks for the advice. I will hunt down some higher quality fuel and see what the result is.

[lowrydr310]

Originally Posted by suspect

You also have numerous throttle cuts and stft are very negative, I think -30% is the most it can cut. Any rough starting issues? Also why is your IAT so high? What is the outside temperature?

Doesn't a negative fuel trim mean that a bank is rich and DME is leaning the mixture out? I'm still thinking injector problems and possibly carbon buildup on the intake valves (at least contributing to the issue). What injectors do you have on the car now? If you remove the engine cover you could use a mirror to identify the injectors. Are you familiar with the numbering?

IATs don't look too bad, 102 to 108, 6 degree increase. I was just looking at my most recent log and the IATs increased 36 degrees from 99 to 135, and there were zero timing corrections. (yeah I should probably get a bigger intercooler)

[ESmotorsports]

The Injectors are all 01’s.
Going to try getting some better quality fuel in the car tomorrow and see how she does. Thinking of adding 101 my current 91 to get 93. Does that seem like a good idea?

[suspect]

Originally Posted by lowrydr310

Doesn't a negative fuel trim mean that a bank is rich and DME is leaning the mixture out? I'm still thinking injector problems and possibly carbon buildup on the intake valves (at least contributing to the issue). What injectors do you have on the car now? If you remove the engine cover you could use a mirror to identify the injectors. Are you familiar with the numbering?

IATs don't look too bad, 102 to 108, 6 degree increase. I was just looking at my most recent log and the IATs increased 36 degrees from 99 to 135, and there were zero timing corrections. (yeah I should probably get a bigger intercooler)

Yes the dme is trying to make mixture leaner and it’s happening on both banks? Could be injectors but I have not seen all six fail at once. Usually a couple fail and you can see differences in AFR between the banks but not here.

[iqraceworks]

Originally Posted by 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

I was getting superknock codes a few year ago....when I was just cruising around at part throttle. Ended up replacing both of my knock sensors on the block.....haven't had an issue since. Not saying that's your issue.....but they are cheap to replace, and it's not crazy uncommon for them to act up.