[erzenble]

I am DESPERATE to have my car fixed. I have had it for a year and logs still look terrible. I will paypal 30$ to whoever can diagnose.

The car is a 2011 335i N55 running MHD stage 1 91 oct map, on 92 octane gas.

PROBLEMS:
The car is pulling timing almost every time i WOT and boost is always under target. Both problems also happen with stock map. Also the throttle is jerky especially in low gears.

WHAT I HAVE TRIED:
Running 95 oct gas and didn't fix timing corrections.
All new bmw plugs and coil packs.
Checked for codes and had none.
Pressure tested for boost leaks and had none.
Changed vac lines.
New boost solenoid.

I have checked vacuum at idle and got 8 inhg. At 8inhg the wgdc was at 35pcnt. It went up to 25 inhg for a second when i gave it throttle. Im not sure what its supposed to be at.

I also applied vacuum to the wastegate actuator with a vac pump and up to 4 inhg the actuator arm didn't move. Then it moved in from 4inhg up untill 8inhg and stopped. Im confused, if the wastegate is fully closed at 8inhg wouldnt it always be closed? My WGDC almost never goes below 35pcnt.

LOGS:
Here is a log i took today with some short WOT going to work: https://datazap.me/u/erzenble/wot-go...og=0&data=3-11

3rd gear logs: https://datazap.me/u/erzenble/log-af...43&tmax=100.04
https://datazap.me/u/erzenble/95-oct...22-23-24-25-26

Log with 3rd gear pull then WOT in 4th on freeway horrible corrections:
https://datazap.me/u/erzenble/92-oct...03&tmax=212.78

If anyone could help me go from here i would be grateful!

[SnapCoupe]

You have some serious jumps in IAT on those logs. 30+ degrees F increase over one pull is pretty significant. In the 4th gear WOT pull you can see a lot of fluctuations in boost and WGDC.

Do you have any non-tune related symptoms? (long cranks, idle issues, etc)

[turbohugh]

That's very low vacuum. I had similar issues when my valve cover was cracked.
You may need to replace it and get a walnut blast.

Also high IAT and missing boost target may be a sign of boost leaks . How did you do a boost leak test? You will have to pressurize the system to about 8 psi to be sure it's solid. Are you injecting smoke during the test ?

[erzenble]

Originally Posted by SnapCoupe

You have some serious jumps in IAT on those logs. 30+ degrees F increase over one pull is pretty significant. In the 4th gear WOT pull you can see a lot of fluctuations in boost and WGDC.

Do you have any non-tune related symptoms? (long cranks, idle issues, etc)

I do have long crank times. Idle is smooth.

[erzenble]

Originally Posted by turbohugh

That's very low vacuum. I had similar issues when my valve cover was cracked.
You may need to replace it and get a walnut blast.

Also high IAT and missing boost target may be a sign of boost leaks . How did you do a boost leak test? You will have to pressurize the system to about 8 psi to be sure it's solid. Are you injecting smoke during the test ?

What was your vacuum at idle? Did you also test down at the end of the wastegate hose? Ive been wondering if there was a crack. I looked around for cracks but didnt see one though. Was yours visable?

I pressurized to 10 psi at the end of the inlet with the tester everyone uses. Any higher and it blows my inlet pipe out the hole. There were no leaks besides a small amount comes out the oil cap. Didnt use smoke no.

[erzenble]

So I just checked how much vacuum I have right at the canister in the valve covers and got 26inhg. From what I read that is normal.
I could have gotten a faulty boost solenoid from fcp euro.
Can anyone confirm how much vacuum they have post boost solenoid at idle? And what there wgdc is at idle also?

[julian1999]

If you are having long cranks I ran into this problem with my car. My car is tuned with MHD so I’m able to check codes with and I was getting shadow codes with no check engine light for rail pressure and high pressure fuel pump don’t know the exact code because it’s been some time since I fixed it. I would also get timing corrections for not having enough fuel. I you have a scanner try to see how much rail pressure you have dead cold.

[erzenble]

Originally Posted by julian1999

If you are having long cranks I ran into this problem with my car. My car is tuned with MHD so I’m able to check codes with and I was getting shadow codes with no check engine light for rail pressure and high pressure fuel pump don’t know the exact code because it’s been some time since I fixed it. I would also get timing corrections for not having enough fuel. I you have a scanner try to see how much rail pressure you have dead cold.

Ya I am running MHD also if you read the first post. Not getting any shadow codes and at WOT my rail pressure looks good. Was your rail pressure dropping pretty low at WOT?

[SnapCoupe]

Originally Posted by erzenble

I do have long crank times. Idle is smooth.

Look into the fuel pressure regulator. If you are getting any fuel-related shadow codes, long cranks, and odd drivability issues, replacing it should help. I had a noticeable "lag" and quite a bit of hesitation in certain WOT situations before replacing mine, and since the drivability has been 10 time better. Also the car fires up almost instantly every time.

[erzenble]

Originally Posted by SnapCoupe

Look into the fuel pressure regulator. If you are getting any fuel-related shadow codes, long cranks, and odd drivability issues, replacing it should help. I had a noticeable "lag" and quite a bit of hesitation in certain WOT situations before replacing mine, and since the drivability has been 10 time better. Also the car fires up almost instantly every time.

I'll look into getting one thanks.

[turbohugh]

Originally Posted by erzenble

I'll look into getting one thanks.

What about those vacuum accumulation canisters ? They've been know to crack and leak .

[bbnks2]

Originally Posted by erzenble

I'll look into getting one thanks.

Your logs don't look all that bad to me...

Rail pressure is fine. I don't see any crazy IAT rise. 30f rise across a 3rd gear pull looks like you're on stock inter-cooler? Corrections are at low RPM before IAT's rise so there is no ill effect there. Boost is right on target. Timing corrections are minimal 1-3*... except for the one log... you didn't log "gear" so I can't tell what pull it was... I am guessing it was a 4th gear pull? You only drove up to 3800rpms so it's hard to tell anything by that log... You might've had some knock on boost onset but the corrections are almost completely gone by 3800rpm when you stopped the log... Look at the 3rd gear log as well. Corrections are at boost onset and are completely cleared up by 3k rpms. Tune might need 1-2* pulled out of it at 2,500-3500rpm to prevent the corrections. Or, try better fuel. grab some octane booster or 1-2gallons of E85.

Have you been changing your fuel or tune a lot? It looks like your car is still adapting. Did you just recently flash back to MHD stage 1 from stock? LTFT is +5% but STFT is -10% across a pull. Should learn back close to 0% over the next few days... do some more driving and get fresh logs (make sure to select the gear pid). Grab an idle log and a 3rd or 4th gear log from 3000rpm to 6500rpm or so. Do 2 or 3 while giving adequate time to drive at steady speed to cool off in-between.

As for the waste-gate, it should be fully closed by 5.9in-Hg. Might need to tighten that up a bit. Our waste-gate is opposite of most cars. It is always OPEN and vacuum pulls it shut. This prevents an over-boost situation in the event that the waste-gate actuator fails. I am not saying you have any issue but this might be something to adjust a bit if you bother tearing back into it again. WGDC doesn't look all that abnormal to me.

You said in your original post that you ran "95 oct gas." Where do you even get that? I don't know of any pump in the States that dispenses 95aki. That sounds like the "ron" rating which is only equivalent to 91aki (which is what the tune calls for).

[erzenble]

Originally Posted by bbnks2

Your logs don't look all that bad to me...

Rail pressure is fine. I don't see any crazy IAT rise. 30f rise across a 3rd gear pull looks like you're on stock inter-cooler? Corrections are at low RPM before IAT's rise so there is no ill effect there. Boost is right on target. Timing corrections are minimal 1-3*... except for the one log... you didn't log "gear" so I can't tell what pull it was... I am guessing it was a 4th gear pull? You only drove up to 3800rpms so it's hard to tell anything by that log... You might've had some knock on boost onset but the corrections are almost completely gone by 3800rpm when you stopped the log... Look at the 3rd gear log as well. Corrections are at boost onset and are completely cleared up by 3k rpms. Tune might need 1-2* pulled out of it at 2,500-3500rpm to prevent the corrections. Or, try better fuel. grab some octane booster or 1-2gallons of E85.

Have you been changing your fuel or tune a lot? It looks like your car is still adapting. Did you just recently flash back to MHD stage 1 from stock? LTFT is +5% but STFT is -10% across a pull. Should learn back close to 0% over the next few days... do some more driving and get fresh logs (make sure to select the gear pid). Grab an idle log and a 3rd or 4th gear log from 3000rpm to 6500rpm or so. Do 2 or 3 while giving adequate time to drive at steady speed to cool off in-between.

As for the waste-gate, it should be fully closed by 5.9in-Hg. Might need to tighten that up a bit. Our waste-gate is opposite of most cars. It is always OPEN and vacuum pulls it shut. This prevents an over-boost situation in the event that the waste-gate actuator fails. I am not saying you have any issue but this might be something to adjust a bit if you bother tearing back into it again. WGDC doesn't look all that abnormal to me.

You said in your original post that you ran "95 oct gas." Where do you even get that? I don't know of any pump in the States that dispenses 95aki. That sounds like the "ron" rating which is only equivalent to 91aki (which is what the tune calls for).

Hey bbnks thanks for replying. So corrections are usually through out the whole run and most the time up to -6-8 deg pulled. From what I have read and others have told me that if 3 cylinders are all pulling timing during a WOT run thats very bad.
My boost doesn't look close to normal to me. It usually peaks right away at low rpm then immediately drops 2-4 psi for most the run. Sometimes it comes back to target but immediately drops again.
The runs are all labeled what gear I was in. But yes the 4th gear log was the one with really bad corrections. Those corrections are pretty scary to me.
I should have specified my bad, when I said 95 Oct its because I had 92 Oct pump plus octane booster which said it raises octane by 3 numbers. Im only running a 91 Oct tune. I feel like I should have very few corrections. I dont wanna blow this motor.

So the tune hasn't been changed for months. Still on MHD stage 1 .. 91 oct
My LTFT are always around 6. Or sometimes 9. For a bit.
I was actually going to adjust the wastegate today but ran out of time. I think that could be the reason boost is all over the place.
So you dont think my wgdc looks abnormal? From logs I have compared too they all go 100 pcnt wgdc for a good while then taper down to 50-60 wgdc till redline.
I will get you guys some fresh runs tomorrow morning.

Also I appreciate your detailed reply.. If we can figure this out I'll definitely throw that cash your way.

[bbnks2]

Originally Posted by erzenble

So corrections are usually through out the whole run and most the time up to -6-8 deg pulled. From what I have read and others have told me that if 3 cylinders are all pulling timing during a WOT run thats very bad.

Yeah I wouldn't call that good lol. I am only look at the two logs you posted and telling you what I see. I see the corrections are at boost onset and then clear up. First thing I would do is go WOT a little later like 3000 rpm and see if avoiding that area of the map helps prevent them from popping up...

Originally Posted by erzenble

My boost doesn't look close to normal to me. It usually peaks right away at low rpm then immediately drops 2-4 psi for most the run. Sometimes it comes back to target but immediately drops again.

Originally Posted by erzenble

So you dont think my wgdc looks abnormal? From logs I have compared too they all go 100 pcnt wgdc for a good while then taper down to 50-60 wgdc till redline.

Can you link to the log you are referencing? Put a "flag" at the spot you're talking about. I don't see anything like this in the logs you posted. Maybe you are referencing logs from before you replaced your boost solenoid?

gear: 3rd
rpm: 5306
Boost target: 14.3
Boost: 14.5
WGDC: 67 %

https://datazap.me/u/erzenble/92-oct...03&tmax=212.78

Looks normal. When comparing to other logs, please ensure you are comparing the same gear and RPM. WGDC at 6300rpm will not be the same as at 4500rpm. The stage 1 91aki logs I found quick all look similar to yours. Make sure you are comparing to a v1.54 log too. I actually see quite a few people holding less boost than you are. Some are down to 10psi at that RPM.

Originally Posted by erzenble

I will get you guys some fresh runs tomorrow morning.

That would be helpful. The trims being out of whack is odd but maybe related to the octane booster? Your injectors don't appear to be leaking based on the log... Vacuum leaks generally present as LEAN conditions causing fuel trims to go POSITIVE (adding fuel). Chasing your tail looking for a vacuum leak I think. Lets see where trims settle to after spending a few days driving around the car and doing a few more pulls. Might want to clean the MAF in the intake?

Edit: Stock cats in place? I looked at a few more logs and it seems people with stock cats still in place also have negative fuel trims at WOT. Not -30 %, but still, negative fuel trims seems to be a trend with the stage 1 map.

https://datazap.me/u/jwallace410/new...-32-33&mark=63

some more logs posted here to compare to:
https://www.e90post.com/forums/showthread.php?t=1423660

[erzenble]

Originally Posted by bbnks2

Yeah I wouldn't call that good lol. I am only look at the two logs you posted and telling you what I see. I see the corrections are at boost onset and then clear up. First thing I would do is go WOT a little later like 3000 rpm and see if avoiding that area of the map helps prevent them from popping up...





Can you link to the log you are referencing? Put a "flag" at the spot you're talking about. I don't see anything like this in the logs you posted. Maybe you are referencing logs from before you replaced your boost solenoid?

gear: 3rd
rpm: 5306
Boost target: 14.3
Boost: 14.5
WGDC: 67 %

https://datazap.me/u/erzenble/92-oct...03&tmax=212.78

Looks normal. When comparing to other logs, please ensure you are comparing the same gear and RPM. WGDC at 6300rpm will not be the same as at 4500rpm. The stage 1 91aki logs I found quick all look similar to yours. Make sure you are comparing to a v1.54 log too. I actually see quite a few people holding less boost than you are. Some are down to 10psi at that RPM.



That would be helpful. The trims being out of whack is odd but maybe related to the octane booster? Your injectors don't appear to be leaking based on the log... Vacuum leaks generally present as LEAN conditions causing fuel trims to go POSITIVE (adding fuel). Chasing your tail looking for a vacuum leak I think. Lets see where trims settle to after spending a few days driving around the car and doing a few more pulls. Might want to clean the MAF in the intake?

Edit: Stock cats in place? I looked at a few more logs and it seems people with stock cats still in place also have negative fuel trims at WOT. Not -30 %, but still, negative fuel trims seems to be a trend with the stage 1 map.

https://datazap.me/u/jwallace410/new...-32-33&mark=63

some more logs posted here to compare to:
https://www.e90post.com/forums/showthread.php?t=1423660

Hey finally grabbed some logs, been bad weather here. So im definitely getting corrections through the whole RPM range. The 5 runs i logged had horrible corrections and IATs were lower then before too. Im not sure what to even try to fix that. Should i try running even more octane booster? I feel like 92 oct plus booster should run fine on a 91 oct map ya know? Maybe i should try another map? could try the 93 oct map or map 0.

You are right im holding boost at high RPMs very well but that's not really what im concerned about. Its the big dip in boost i get early on. I can feel the loss in power mid RPMs. I actually just noticed that the drop in boost always happens in the same RPM range, right at 4300 RPMs. It over boosts then Drops 2-3 PSI right at 4300. Then climbs back up to target before lowering once more which is normal at high RPMs. Ill put a flag where it dips down to 11 psi in the logs. Yes im on stock cats, DP and intercooler. I have cleaned the MAF, and boost sensor recently FYI.

I feel like this is a waste-gate issue. It seems like the DME cant accurately keep boost at target so it over/under compensates every run. I was comparing some of those other logs and ya your right my STFT is maxing out at -30 by the end of the run while others are at -10 at the most. I wonder whats causing the extra fuel? I was also looking at WGDC and mine goes much higher then most, adjusting the waste-gate could fix that tho i'm thinking. Also i was gonna ask you, Have you ever checked a waste-gate with a vac pump? when i checked mine the waste-gate wouldn't move for the first 4 INHG of vacuum. That doesn't seem right to me.

A Shadow code popped up recently. code 2DD0 Valvetronic system: control deviation warning threshold exceeded. From what i read its nothing to be worried about but i wanted to mention it. Im going to clear it and see if it comes back.

https://datazap.me/u/erzenble/92-oct...26-27&mark=296

https://datazap.me/u/erzenble/92-oct...26-27&mark=158

https://datazap.me/u/erzenble/92-oct...26-27&mark=119

https://datazap.me/u/erzenble/92-oct...26-27&mark=404

https://datazap.me/u/erzenble/92-oct...26-27&mark=129

[bbnks2]

Originally Posted by erzenble

So im definitely getting corrections through the whole RPM range. The 5 runs i logged had horrible corrections and IATs were lower then before too. Im not sure what to even try to fix that. Should i try running even more octane booster? I feel like 92 oct plus booster should run fine on a 91 oct map ya know? Maybe i should try another map? could try the 93 oct map or map 0.

I doubt octane booster is doing anything. Do you have ethanol near you? Try adding 1-2 gallons instead of the octane booster. You do have quite a bit of corrections but it's honestly nothing tooo crazy. Small 1-3* corrections are fairly normal. One log does look pretty bad though.

Originally Posted by erzenble

You are right im holding boost at high RPMs very well but that's not really what im concerned about. Its the big dip in boost i get early on.

This is the tune. There is nothing wrong there. Probably has to do with VANOS or the transition from "spool mode." I think TwistedTuning has been away the past month but if you e-mail you can possibly get a few tweaks to the rpm range there. My custom tune does the same thing and I am waiting on a revision.

Originally Posted by erzenble

Yes im on stock cats, DP and intercooler. I have cleaned the MAF, and boost sensor recently FYI.

I was comparing some of those other logs and ya your right my STFT is maxing out at -30 by the end of the run while others are at -10 at the most. I wonder whats causing the extra fuel?

Again, injectors and rail pressure look fine but -30 trims is a bit excessive in comparison to other peoples logs. Do you have any logs of before adding the octane booster? Not sure how that affects trims... never used the stuff. Have you considered going catless down-pipes? You might be much happier with the way the logs look after the restriction and heat of the cats is removed. Cat could be clogged?

Originally Posted by erzenble

I feel like this is a waste-gate issue. It seems like the DME cant accurately keep boost at target so it over/under compensates every run. I was also looking at WGDC and mine goes much higher then most, adjusting the waste-gate could fix that tho i'm thinking. Also i was gonna ask you, Have you ever checked a waste-gate with a vac pump? when i checked mine the waste-gate wouldn't move for the first 4 INHG of vacuum. That doesn't seem right to me.

I don't see any signs of a waste-gate issue or "overcompensation." You would see WGDC oscillating. Your WGDC is smooth and it isn't far off others... maybe 6-7% difference but again some of the logs out there are cat-less dps. You're holding decent boost at 6,000+.

Yes, I have put a vacuum on several turbos now with a hand pump. The waste-gate doesn't move until about 4inHg+ and then is completely closed by 5.9inHg. Seems like a narrow window but that's correct operation.

Originally Posted by erzenble

A Shadow code popped up recently. code 2DD0 Valvetronic system: control deviation warning threshold exceeded. From what i read its nothing to be worried about but i wanted to mention it. Im going to clear it and see if it comes back.

This could become an issue to keep an eye on. Beginning of valvetronic motor failure. Pretty common for them to burn out and the car to get stuck at minimum valve lift.

[erzenble]

Originally Posted by bbnks2

I doubt octane booster is doing anything. Do you have ethanol near you? Try adding 1-2 gallons instead of the octane booster. You do have quite a bit of corrections but it's honestly nothing tooo crazy. Small 1-3* corrections are fairly normal. One log does look pretty bad though.



This is the tune. There is nothing wrong there. Probably has to do with VANOS or the transition from "spool mode." I think TwistedTuning has been away the past month but if you e-mail you can possibly get a few tweaks to the rpm range there. My custom tune does the same thing and I am waiting on a revision.



Again, injectors and rail pressure look fine but -30 trims is a bit excessive in comparison to other peoples logs. Do you have any logs of before adding the octane booster? Not sure how that affects trims... never used the stuff. Have you considered going catless down-pipes? You might be much happier with the way the logs look after the restriction and heat of the cats is removed. Cat could be clogged?



I don't see any signs of a waste-gate issue or "overcompensation." You would see WGDC oscillating. Your WGDC is smooth and it isn't far off others... maybe 6-7% difference but again some of the logs out there are cat-less dps. You're holding decent boost at 6,000+.

Yes, I have put a vacuum on several turbos now with a hand pump. The waste-gate doesn't move until about 4inHg+ and then is completely closed by 5.9inHg. Seems like a narrow window but that's correct operation.



This could become an issue to keep an eye on. Beginning of valvetronic motor failure. Pretty common for them to burn out and the car to get stuck at minimum valve lift.

So my car has been feeling really powerful. smoked a charger today on the freeway lol.
No i don't have ethanol anywhere near here unfortunately . i know there's some expensive race fuel available pretty close might try to get some of that. I know someone that runs really high leaded race fuel, do you know if 1 or 2 gallons of leaded would hurt anything? If i end up running that and still get corrections there's gotta be a problem i would think.

So the boost dip is in the tune huh? If you say so i beleive you. The car does pull strong right now.

The 5 logs i posted the other day were on a fresh tank of 92. No booster. I don't think i'm going to try oct booster anymore, it turned my plugs orange when i pulled them. Cleaned them up good though.
Ya know i have been wondering if my cats are partially clogged. What would cause that? Raw fuel hitting them? I would like some DP's. What does that do for the logs? Wouldn't effect corrections would it?

It's good to know that's normal waste-gate operation. Kinda weird how it goes open to closed from 4-6 INHG.

Do you think its safe to run the tune im on with the logs im getting? every time i floor it i worry. There doesn't seem to be a good cheap fueling option close to me unfortunately. Would be lame if i have to stay running stock MAP.

Hey i appreciate your help. If you shoot me your paypal info ill transfer you that $30.

[bbnks2]

Originally Posted by erzenble

So my car has been feeling really powerful. smoked a charger today on the freeway lol.

Well that's a good thing, right?

Originally Posted by erzenble

No i don't have ethanol anywhere near here unfortunately . i know there's some expensive race fuel available pretty close might try to get some of that. I know someone that runs really high leaded race fuel, do you know if 1 or 2 gallons of leaded would hurt anything?

No idea, but it sure wouldn't bee good for the catalytic converter and either is constantly using octane booster.

Originally Posted by erzenble

So the boost dip is in the tune huh? If you say so i beleive you. The car does pull strong right now.

Yes, based on your logs (WGDC and Boost), I would say it's just the tune and nothing to worry about mechanically.

Originally Posted by erzenble

The 5 logs i posted the other day were on a fresh tank of 92. No booster. I don't think i'm going to try oct booster anymore, it turned my plugs orange when i pulled them. Cleaned them up good though.

Ya know i have been wondering if my cats are partially clogged. What would cause that? Raw fuel hitting them?

see above.

Originally Posted by erzenble

I would like some DP's. What does that do for the logs? Wouldn't effect corrections would it?

It might... catless downpipe = less restriction and heat. So, less wgdc for the same boost. Hi-flow catted downpipes are always an option for oem+ type cars.

Originally Posted by erzenble

It's good to know that's normal waste-gate operation. Kinda weird how it goes open to closed from 4-6 INHG.

it is what it is lol

Originally Posted by erzenble

Do you think its safe to run the tune im on with the logs im getting? every time i floor it i worry. There doesn't seem to be a good cheap fueling option close to me unfortunately. Would be lame if i have to stay running stock MAP.

Like I said earlier, try to go WOT later in the rpm band. Try like 3,300 rpm+ instead of going WOT at 2600rpm... that might help in that key low rpm problem area where you see a bunch of corrections pop up. Maybe get a custom tune done. Twisted Tuning is affordable and can tweak a 91aki map just for your car.

Originally Posted by erzenble

Hey I appreciate your help. If you shoot me your paypal info i'll transfer you that $30.

Not necessary at all.