Originally Posted by WedgePerformance

Did you replace the HP Rail sensor?

I did not.

[Sgop335]

Originally Posted by FCobra94

New log I took this morning after a handful of WOT runs over the last couple days (traction control was half off this time):
http://www.datazap.me/u/fcobra94/log...28&zoom=91-122

AFRs go all whack-a-doo from 2900-3250 RPM, each bank being off by a full point; this seems to be the result of STFT1 flatlining for that period of time.

WedgePerformance: could this be an Open loop/Closed loop thing?

Not really sure what else it could be since everything is brand new (HPFP, LPFP, LPFP sensor, injectors, primary O2 sensors, etc.).

I also reset all three fuel adaptations 3 days ago when I saw this same issue creep up then; I thought it was a fluke given that I just so happened to change Ethanol content from E65 to E60, but apparently not.

Everything is new, what can i fault?
Its not that bad at all, but has this map been better for the afr issues you point?
If not, then could be banks 1&2 not the same (afr and or scalar)?
If log parameters are avail, log torque limit so no guessing for traction etc.

[drunkentrader]

Hey, so I kinda suck at this.. but i managed to run a 3rd gear log from 2k rpms to close to redline.. problem is i didnt floor it(did not disable transmission kickdown) so it looks like i was at 75% to 85% throttle. there was too much traffic on the hwy so i took it to a side road where I was obviously a little hesitant to hoon down a 45 mph street winding out 3rd gear.

anyways, if you all could give some feedback that'd be great!

2009 335i Auto. 55k miles. New plugs, new/rebuilt bank(cyl 1-3) of index 8 injectors, fresh walnut blast and a couple recent coils replaced.

MHD stage 1 95 octane, running E25. All stock parts aside from charge pipe.


Thanks!

Loggy(yeah, i button mashed a bit on the display settings):

http://www.datazap.me/u/drunkentrade...=28&mark=61-49

Originally Posted by WedgePerformance

Did you replace the HP Rail sensor?

Originally Posted by Sgop335

Its not that bad at all, but has this map been better for the afr issues you point?

Thank you for the support gents!

Here's another log from this morning, unfortunately not looking any better and it seems both banks are effected today:
http://www.datazap.me/u/fcobra94/log...8&zoom=192-233

Sgop335: Geez, you're absolutely right; after going back and checking previous logs, this seems to have been happening more often than not on most of my logs ever since May.

So basically as I progressed from MHD Stage 1+, Stage 2+, E40, and now E60, STFT seems to flatline within the same RPM range of ~2k to ~3k (unfortunately I have no saved Cobb map datalogs to reference/compare). Flatlining seems to be consistent both before and after refreshing the majority of my fuel system components as well:

March: HPFP + LPFP sensor + Stage 2 LPFP
May: moved from Cobb to MHD Stage 1+
August: Index 12 injectors
September: downpipes + primary O2 sensors -> MHD Stage 2+
October: replaced EKPM w/ used unit -> MHD E40 -> MHD E60

90% of the time it seems that only STFT1 is flatlining @ -12 from ~2k to ~3k RPM, then goes back to normal from 3k RPM on.

The rest of the time it can happen with either or both STFT1 & STFT2 between 3k-4k RPM. Both STFT1 & STFT2 have ALWAYS gone back to normal at/above 4k RPM.

I also don't seem to be seeing any of these issues immediately after resetting adaptations within MHD; the flatlining only seems to creep in as time goes on.

Having said that, I'm not sure if this is something that a custom tune would fix or what..??

[Anend_E90]

335xi - MHD Stage1+ 93oct
FMIC, CP+BOV, DCI

I just had a walnut blast done, post shift timing corrections are all I see - but I'm no expert

http://www.datazap.me/u/rhamm/log-14...10-11-12-13-24

[WedgePerformance]

Originally Posted by FCobra94

Thank you for the support gents!

Here's another log from this morning, unfortunately not looking any better and it seems both banks are effected today:
http://www.datazap.me/u/fcobra94/log...8&zoom=192-233

Sgop335: Geez, you're absolutely right; after going back and checking previous logs, this seems to have been happening more often than not on most of my logs ever since May.

So basically as I progressed from MHD Stage 1+, Stage 2+, E40, and now E60, STFT seems to flatline within the same RPM range of ~2k to ~3k (unfortunately I have no saved Cobb map datalogs to reference/compare). Flatlining seems to be consistent both before and after refreshing the majority of my fuel system components as well:

March: HPFP + LPFP sensor + Stage 2 LPFP
May: moved from Cobb to MHD Stage 1+
August: Index 12 injectors
September: downpipes + primary O2 sensors -> MHD Stage 2+
October: replaced EKPM w/ used unit -> MHD E40 -> MHD E60

90% of the time it seems that only STFT1 is flatlining @ -12 from ~2k to ~3k RPM, then goes back to normal from 3k RPM on.

The rest of the time it can happen with either or both STFT1 & STFT2 between 3k-4k RPM. Both STFT1 & STFT2 have ALWAYS gone back to normal at/above 4k RPM.

I also don't seem to be seeing any of these issues immediately after resetting adaptations within MHD; the flatlining only seems to creep in as time goes on.

Having said that, I'm not sure if this is something that a custom tune would fix or what..??

Shoot me an email request for the BMW Coding tools. WedgePerformance@gmail.com

You can do a full adaptation reset with INPA. Not sure if that will help, but you can also look at 02 sensor voltage real-time to see if one is way off. The rear sensors play a big role in trimming control and biasing trims. Might just have an issue with the rear sensors sense we don't do anything with them for catless and it can cause some issues from what I have seen. Would be nice if we could just disable them both.

[86merc]

Hi guys,

I did some work to fix why my boost was lower than my target boost. Tested the wastegates, boost solenoids, check tubing and so on. One connection at the FMIC was leaking a little. One of the boost solenoids was leaking down slowly under vacuum. I replaced both solenoids to make sure the car was in good working order. Seems to look better on the logs too.

I replaced my battery as well. My mechanic buddy helped out since that has to be coded to the car. He said he also reset the fuel maps. Boost looks much better than it was. If you guys can check it out and confirm everything else looks good I would appreciate it. Thank you again in advance!


2009 335xi w/ DCI, VRFS stepped 5" intercooler & upgraded discharge tube, 93 octane, and MHD stage 1+ tune. The temp was probably around 55-60 degree F. I bought the 5" intercooler used. Looking at the AIT in this log, I may upgrade to a 7" version come spring/summer.


http://www.datazap.me/u/86merc/log-1...&data=3-4-5-22

Again, thank you for the help guys.

[CoffeeBean]

Originally Posted by YoungBlood

E85 is only E70ish around here. I mix 50/50 and it comes out to e40 or a hair under usually fwiw.

Which tune and mods for you? Is there any disadvantage to going with a higher ethanol mix? You wind up with a higher octane the more you put in right?

Here is another pull I did today and there's definitely a difference. Still timing pulled in cyl2, but not nearly as bad (worse after shifting to 4th). Failing or leaking injector there?

http://datazap.me/u/rossburns/log-14...7-8-9-10-11-21

Can someone explain my STFT values? I'm not sure what they should be, but I think they're very low..?

[Thewind727]

Originally Posted by RossTheBoss

Which tune and mods for you? Is there any disadvantage to going with a higher ethanol mix? You wind up with a higher octane the more you put in right?

Here is another pull I did today and there's definitely a difference. Still timing pulled in cyl2, but not nearly as bad (worse after shifting to 4th). Failing or leaking injector there?

http://datazap.me/u/rossburns/log-14...7-8-9-10-11-21

Can someone explain my STFT values? I'm not sure what they should be, but I think they're very low..?

from my short experience with this car and MHD your lpfp is not keeping up and is probably causing the rest of the system to go wrong, my lpfp is brand new and cant quite handle running e85, once that pressure drops below 55ish it seems like other things like timing and stft start going downhill

[FPsN54]

So I've been having this strange RPM dip/surge around the 2k range. Decided to take a quick log this morning to catch it.

There's a drop at 2037rpms and a hard jerk at 2296rpms. Looks like there's some timing corrections going on around that time. Can someone help me figure out what is causing this? Thanks!

BTW, I will be replacing plugs and coil packs along with an oil change this coming weekend.

Mods are 7" VRSF intercooler and MHD stage 1+

http://datazap.me/u/fpsn54/log-14790...14-16-24-25-26

EDIT: Went out to grab another log now that traffic on the hwy has died down. Dropped into 3rd gear and went WOT. Right away car started stumbling and threw a CEL.

Pulled codes and found:
Misfire detection cylinder 3 in 2 Firing order 0029CF
Misfire detection cylinder 1 in 1 Firing order 0029CD
Misfire detection error summation 0029CC

Originally Posted by FPsN54

So I've been having this strange RPM dip/surge around the 2k range. Decided to take a quick log this morning to catch it.

There's a drop at 2037rpms and a hard jerk at 2296rpms. Looks like there's some timing corrections going on around that time. Can someone help me figure out what is causing this? Thanks!

BTW, I will be replacing plugs and coil packs along with an oil change this coming weekend.

Mods are 7" VRSF intercooler and MHD stage 1+

http://datazap.me/u/fpsn54/log-14790...14-16-24-25-26

Looks like boost overshoot which leads to heavy throttle closure..??

[JustDriveIt]

Originally Posted by FPsN54

So I've been having this strange RPM dip/surge around the 2k range. Decided to take a quick log this morning to catch it.

There's a drop at 2037rpms and a hard jerk at 2296rpms. Looks like there's some timing corrections going on around that time. Can someone help me figure out what is causing this? Thanks!

BTW, I will be replacing plugs and coil packs along with an oil change this coming weekend.

Mods are 7" VRSF intercooler and MHD stage 1+

http://datazap.me/u/fpsn54/log-14790...14-16-24-25-26

EDIT: Went out to grab another log now that traffic on the hwy has died down. Dropped into 3rd gear and went WOT. Right away car started stumbling and threw a CEL.

Pulled codes and found:
Misfire detection cylinder 3 in 2 Firing order 0029CF
Misfire detection cylinder 1 in 1 Firing order 0029CD
Misfire detection error summation 0029CC

From the log, Your throttle closure is fine and normal with the boost being slightly above normal and it correcting out with throttle modulation.

Lots of corrections at high RPM and WOT in cylinder 2 which is very concerning.

STFTs are lower than they should be.


From the codes looks like those timing corrections came to bite you.

First thing I would do is go ahead and change your coils and plugs. If you can't do all 6, at least do cylinder 1, 2, and 3.

[86merc]

My boost is on target now. Could you guys take a look to see if there are any issues or things that need to be addressed?

Thanks you

http://www.datazap.me/u/86merc/log-1...=2-3-4-5-22-25

Originally Posted by WedgePerformance

Shoot me an email request for the BMW Coding tools. WedgePerformance@gmail.com

You can do a full adaptation reset with INPA. Not sure if that will help, but you can also look at 02 sensor voltage real-time to see if one is way off. The rear sensors play a big role in trimming control and biasing trims. Might just have an issue with the rear sensors sense we don't do anything with them for catless and it can cause some issues from what I have seen. Would be nice if we could just disable them both.

Thanks for the offer Wedge!!

I actually ran through INPA last night and did a full adaptation reset. Did a couple of pulls this morning and came up with the same result unfortunately:
http://www.datazap.me/u/fcobra94/log...-28&zoom=46-74
http://www.datazap.me/u/fcobra94/log...8&zoom=192-226

I took a vid of the O2 sensor voltage real-time and both rear sensors behave in the exact same manner, with each taking turns bouncing back and forth from ~0.84 to ~0.08 at idle (screenshots attached).

Not sure how I missed this thread while researching my issue previously, but Jake hit paydirt in regards to this -12% STFT phenomenon:
www . boost addict . com/showthread.php?74363-STFT-Sticking-at-12-at-WOT&p=700574#post700574

Your thoughts on this by chance? Have you had to adjust fuel scalars in the past to dial out STFT issues?

[CoffeeBean]

Originally Posted by 86merc

My boost is on target now. Could you guys take a look to see if there are any issues or things that need to be addressed?

Thanks you

http://www.datazap.me/u/86merc/log-1...=2-3-4-5-22-25

Looks really good. What are your mods?

[WedgePerformance]

Originally Posted by FCobra94

Thanks for the offer Wedge!!

I actually ran through INPA last night and did a full adaptation reset. Did a couple of pulls this morning and came up with the same result unfortunately:
http://www.datazap.me/u/fcobra94/log...-28&zoom=46-74
http://www.datazap.me/u/fcobra94/log...8&zoom=192-226

I took a vid of the O2 sensor voltage real-time and both rear sensors behave in the exact same manner, with each taking turns bouncing back and forth from ~0.84 to ~0.08 at idle (screenshots attached).

Not sure how I missed this thread while researching my issue previously, but Jake hit paydirt in regards to this -12% STFT phenomenon:
www . boost addict . com/showthread.php?74363-STFT-Sticking-at-12-at-WOT&p=700574#post700574

Your thoughts on this by chance? Have you had to adjust fuel scalars in the past to dial out STFT issues?

I agree the -12 is annoying, but doesn't cause as much issue as flatline zero trims cause, which is a big issue on some cars. Some cars go rich when this happens and some go lean. Hopefully Jake and Martial can figure out what causes this and disable it from crashing.

So, when I see this issue, I lean out the trims and run a bit richer AFRs. Also, if you see oscillation in the HPFP, you need to increase fuel pressure request on the HPFP.

Originally Posted by WedgePerformance

I agree the -12 is annoying, but doesn't cause as much issue as flatline zero trims cause, which is a big issue on some cars. Some cars go rich when this happens and some go lean. Hopefully Jake and Martial can figure out what causes this and disable it from crashing.

So, when I see this issue, I lean out the trims and run a bit richer AFRs. Also, if you see oscillation in the HPFP, you need to increase fuel pressure request on the HPFP.

Interesting perspective Wedge, thanks for the insight! Agreed though; at least AFR goes rich in my case as opposed to lean.

Jake and others have found the answer by reducing the fuel scalar in the 2000-3000rpm/75-100 load regions, which fixed this same issue in every instance (screenshot attached); it appears that you take a different approach.

It's interesting that, all else being equal (tune, mods, maintenance, etc.), cars either have this issue or they don't; there seems to be no in between.

Curious to see if MHD Tuning has any thoughts on the topic.

Thanks again!

[86merc]

Originally Posted by RossTheBoss

Looks really good. What are your mods?

Great.

2009 335xi w/ DCI, VRFS stepped 5" stepped intercooler & upgraded up tube, VRFS charge pipe, Turbo Smart BOV, 93 octane, and MHD stage 1+ tune.

Thanks for the help.

[Sgop335]

Originally Posted by FCobra94

Interesting perspective Wedge, thanks for the insight! Agreed though; at least AFR goes rich in my case as opposed to lean.

Jake and others have found the answer by reducing the fuel scalar in the 2000-3000rpm/75-100 load regions, which fixed this same issue in every instance (screenshot attached); it appears that you take a different approach.

It's interesting that, all else being equal (tune, mods, maintenance, etc.), cars either have this issue or they don't; there seems to be no in between.

Curious to see if MHD Tuning has any thoughts on the topic.

Thanks again!

Interesting, Wonder how that works given your load is not in that range. I lean out the entire low load range <120 or so slightly.
Edit, yep i see it flatlining starting at load 92.

[slanteyez]

I am pretty sure you problems are coming from a malfunctioning IAT sensor.

Originally Posted by FCobra94

New log I took this morning after a handful of WOT runs over the last couple days (traction control was half off this time):
http://www.datazap.me/u/fcobra94/log...28&zoom=91-122

AFRs go all whack-a-doo from 2900-3250 RPM, each bank being off by a full point; this seems to be the result of STFT1 flatlining for that period of time.

WedgePerformance: could this be an Open loop/Closed loop thing?

Not really sure what else it could be since everything is brand new (HPFP, LPFP, LPFP sensor, injectors, primary O2 sensors, etc.).

I also reset all three fuel adaptations 3 days ago when I saw this same issue creep up then; I thought it was a fluke given that I just so happened to change Ethanol content from E65 to E60, but apparently not.

Originally Posted by slanteyez

I am pretty sure you problems are coming from a malfunctioning IAT sensor.

Have you experienced similar issues?

[slanteyez]

Originally Posted by FCobra94

Have you experienced similar issues?

Yes on my DSM on speed density. Our 335is are also using speed density. IAT needs to be working properly to calculate Mass Airflow. If you look at your logs since August you can tell your IAT sensor is malfunctioning which is probably causing all those weird AFRs and fuel trims. Surprised no one as caught that yet.