[335xiE90]

Originally Posted by whyzee125

There’s an excellent article somewhere about interpreting logs for this platform. Everyone should read it as it’s informative and quite interesting.

Is this it? https://boostmonkey.com/blogs/guides...335i-135i-535i

[whyzee125]

Originally Posted by 335xiE90

Is this it? https://boostmonkey.com/blogs/guides...335i-135i-535i

Yes! That's the one!

[335i_slow_]

Hello I need help! So I was driving and I wanted to pass some cars in a legal matter and when I got a chance on a straight I down shifted to 3rd and stepped on it and when I shifted to fourth and I got a check engine light. I have a tablet with MHD to monitor so I read the codes at that Instant and it gave me a 30FC not a 30FF or 30FE so I checked all vacuum hoses every is good and boost solenoids have less than 15k miles so I’m stumped. I cleared the codes and tried to replicate the same thing and nothing happened but I logged it. Here’s the log.
https://datazap.me/u/335islow/30fc?log=0&data=4-26

Let me know what you guys see that can cause my issue

[LastGray]

I’ve been experiencing symptoms similar to what’s mentioned on this threadhttps://www.e90post.com/forums/showthread.php?t=1972983.

My Data log : https://datazap.me/u/zackie51/mhd-v1...og=0&data=3-16

Problem description : during mid-heavy throttle input there’s a massive jerk/knock/bang as soon as I lift off the throttle. Since mine’s a 6MT I can avoid the jerk by clutching in but I still notice the revs still shooting up even AFTER I lift off. From the logs you can see that it’s not because my foot is still on the throttle while stepping on the clutch, but something seems to keep the RPMs climbing and also maintaining boost.

Other notes : Pull was done in 4th gear because to the best condition to simulate this was during a prolonged heavy load. My mods are a charge pipe with Turbosmart Dualports and a VSRF 5.5” HD intercooler. MHD+ v10 Stage 1+ map. 1M throttle set to 30%. Turning it off makes no difference. Pops and bangs and anti-lag are off. Even at 70% power for the map, it still happens. Totally alleviated once I do a full restore to stock maps (not Stage 0).

This did not happen when I was on the pre MHD+ maps before app v3.00 (similar to the case in the link above) with the exact same settings.

I’d like to know if anyone faced this issue as well and did it get resolved? If yes, please let me know what was done.

[LucaN54]

What u guys think ?
Is all good with the engine?

https://datazap.me/u/lucan54/new-inj...og=0&data=3-21

[BMW Guy]

Can someone review this log: https://datazap.me/u/bmw335in55/log-...ata=2-4-5-7-14

[lookalikehuuh]

Originally Posted by BMW Guy

Can someone review this log: https://datazap.me/u/bmw335in55/log-...ata=2-4-5-7-14

Man you have some serious maintenance to do on your car... you have timing corrections galore, literally multiple per cylinder the entire run. You are a couple of PSI under the target boost pressures too.

When is the last time you did plugs and coils on that car? Either you have destroyed plugs or are using the crappiest quality fuel known to mankind. Make sure you are using high quality premium fuels like Shell or Chevron.

Your boost pressure are also like 2PSI below the target the entire run so there's got to be either a boost leak or something else going on there.

[lookalikehuuh]

Originally Posted by LucaN54

What u guys think ?
Is all good with the engine?

https://datazap.me/u/lucan54/new-inj...og=0&data=3-21

Looks pretty clean to me, ready for stage 1+?

[LucaN54]

Originally Posted by lookalikehuuh

Looks pretty clean to me, ready for stage 1+?

hell yea !!

[BMW Guy]

Thank you for taking a look. Coils and plugs were done 20k miles ago by the previous owner. I have only used Shell V power or Sometimes Mobil but always the 93 Octane. I am in Florida. I've heard running a little below the boost target is sometimes normal but I can look into it. Would you happen to have experience with the VRSF boost pipe I have? The new O-ring VRSF was sent with the pipe fitted very loose. When I contacted support about it, they said it was the right one. The car has no codes besides a shadow code: 2DD0 - Valvetronic system: Control deviation warning threshold exceeded
Should I switch to the 91 Octane map?

[suspect]

Could anyone please take a look at my log and tell me what they think? Got a boost leak. Changed charge pipe, intercooler o rings, vacuum lines, tested DVs, sprayed brake cleaner around intake manifold (no result). Do you think this is boost solenoids or dead turbos? Have WG rattle on deceleration.

https://datazap.me/u/suspect/log-172...&solo=10-11-27

[Sgop335]

Originally Posted by suspect

Could anyone please take a look at my log and tell me what they think? Got a boost leak. Changed charge pipe, intercooler o rings, vacuum lines, tested DVs, sprayed brake cleaner around intake manifold (no result). Do you think this is boost solenoids or dead turbos? Have WG rattle on deceleration.

https://datazap.me/u/suspect/log-172...&solo=10-11-27

Seems like a limp mode or boost deactivation. Wgdc pid and base are same, not normal...

[suspect]

Originally Posted by Sgop335

Seems like a limp mode or boost deactivation. Wgdc pid and base are same, not normal...

There’s no 3100 code and no half power engine light. There is a shadow 30FF code. Do you think wgdc pid and base being same could be because of bad boost solenoids or waste gate rattle on deceleration?

From a little research it looks like part of the calculation for pid value is using air flow. n54 doesn’t have a MAF sensor but a MAP sensor and uses this for speed density calculation. This problem started after ofhg replacement and during that time I took one of the MAP sensors out before the throttle body and cleaned it with contact cleaner. Reckon I broke this MAP sensor? Since the boost is now slow to build too.

Read some more and if it takes too long to reach target then pid times out and only uses base value.

[Sgop335]

Originally Posted by suspect

There’s no 3100 code and no half power engine light. There is a shadow 30FF code. Do you think wgdc pid and base being same could be because of bad boost solenoids or waste gate rattle on deceleration?

From a little research it looks like part of the calculation for pid value is using air flow. n54 doesn’t have a MAF sensor but a MAP sensor and uses this for speed density calculation. This problem started after ofhg replacement and during that time I took one of the MAP sensors out before the throttle body and cleaned it with contact cleaner. Reckon I broke this MAP sensor? Since the boost is now slow to build too.

Read some more and if it takes too long to reach target then pid times out and only uses base value.

looks like Pid timed out, gave up after the second pull.

[whyzee125]

Originally Posted by LastGray

I’ve been experiencing symptoms similar to what’s mentioned on this threadhttps://www.e90post.com/forums/showthread.php?t=1972983.

My Data log : https://datazap.me/u/zackie51/mhd-v1...og=0&data=3-16

Problem description : during mid-heavy throttle input there’s a massive jerk/knock/bang as soon as I lift off the throttle. Since mine’s a 6MT I can avoid the jerk by clutching in but I still notice the revs still shooting up even AFTER I lift off. From the logs you can see that it’s not because my foot is still on the throttle while stepping on the clutch, but something seems to keep the RPMs climbing and also maintaining boost.

Other notes : Pull was done in 4th gear because to the best condition to simulate this was during a prolonged heavy load. My mods are a charge pipe with Turbosmart Dualports and a VSRF 5.5” HD intercooler. MHD+ v10 Stage 1+ map. 1M throttle set to 30%. Turning it off makes no difference. Pops and bangs and anti-lag are off. Even at 70% power for the map, it still happens. Totally alleviated once I do a full restore to stock maps (not Stage 0).

This did not happen when I was on the pre MHD+ maps before app v3.00 (similar to the case in the link above) with the exact same settings.

I’d like to know if anyone faced this issue as well and did it get resolved? If yes, please let me know what was done.

Is it definitely software related and not a mount or bushing knocking due to the additional deflection with the higher power tune?

[vadonchez]

Hi guys

Recently succeed to make my car happy with V10 by choose "MT" in MHD gearbox choice even if my car is a Z4 35IS DCT (Wedge said to me to try different gearbox option and choose the best)

Because I like the V10 stage 2 boost/torque curve I ran it since few hundred kilometers.

Everything works great, no issues but my logs shows a too high WGDC for only stage 2.
I reach 60% WGDC @ 6000rpm when i usualy reach 50% on my previous V10 stage 2 log last year or at the beginning of 2024.(V10 WGDC aren't IAT related like other maps, V10 seem's to be boost target when other are load target, so same boost in winter than in summer just the actual load wich is changing, in simple words car run better in winter than summer where it run the same on V9 map for example)

I checked boost leaks by making a smoke test and Only found small leak on chargepipe/DV connections. That's why i put a MASATA charpipe and now I cans see any boost leak through smoke test.

I checked Vaccuum leak and found any leaks...
I changed Wastegate solenoide and no difference
I tried to check DV by blow some pressure with my mouth and no leaks too.
I checked that wastegate arm can move freely
Spool time seem's ok around 400/500rpm to reach target
Boost is on target exept at high rpm but seem's to be normal (tapering)

Everything seem's to be ok but I still reach about 10% too much compared to normal.

Here are some logs made this morning with full E85 (Z4 has a more robust LPFP and my HPFP pressure seem's to be ok)

https://datazap.me/u/vadonchez/v10-s...0&data=3-22-30

If somebody has an idee please let me know.
My turbos are brand new, i changed them one year ago and made 10000kms since.


Thanks a lot!

[alexsieg]

Can anyone take a look at my weird boost issue I'm having? I'll go slightly over target first but fall off pretty quickly at the higher RPM.

https://datazap.me/u/skyline3499/ove...23&zoom=41-117

[whyzee125]

Originally Posted by vadonchez

Hi guys

Recently succeed to make my car happy with V10 by choose "MT" in MHD gearbox choice even if my car is a Z4 35IS DCT (Wedge said to me to try different gearbox option and choose the best)

Because I like the V10 stage 2 boost/torque curve I ran it since few hundred kilometers.

Everything works great, no issues but my logs shows a too high WGDC for only stage 2.
I reach 60% WGDC @ 6000rpm when i usualy reach 50% on my previous V10 stage 2 log last year or at the beginning of 2024.(V10 WGDC aren't IAT related like other maps, V10 seem's to be boost target when other are load target, so same boost in winter than in summer just the actual load wich is changing, in simple words car run better in winter than summer where it run the same on V9 map for example)

I checked boost leaks by making a smoke test and Only found small leak on chargepipe/DV connections. That's why i put a MASATA charpipe and now I cans see any boost leak through smoke test.

I checked Vaccuum leak and found any leaks...
I changed Wastegate solenoide and no difference
I tried to check DV by blow some pressure with my mouth and no leaks too.
I checked that wastegate arm can move freely
Spool time seem's ok around 400/500rpm to reach target
Boost is on target exept at high rpm but seem's to be normal (tapering)

Everything seem's to be ok but I still reach about 10% too much compared to normal.

Here are some logs made this morning with full E85 (Z4 has a more robust LPFP and my HPFP pressure seem's to be ok)

https://datazap.me/u/vadonchez/v10-s...0&data=3-22-30

If somebody has an idee please let me know.
My turbos are brand new, i changed them one year ago and made 10000kms since.


Thanks a lot!

That log doesn't look bad to me at all. WGDC is so relative that there's not a super clear answer on what's too much. That being said, 60% up top wouldn't scare me. If the car runs well and pulls like it should, send it. If you were at 99% that would be a different story.

[TiAgAu]

Originally Posted by alexsieg

Can anyone take a look at my weird boost issue I'm having? I'll go slightly over target first but fall off pretty quickly at the higher RPM.

https://datazap.me/u/skyline3499/ove...23&zoom=41-117

Looks good! Stock turbos run out of puff 5000rpm+

Check the logs above your post.

[lowrydr310]

Originally Posted by LastGray

I’ve been experiencing symptoms similar to what’s mentioned on this threadhttps://www.e90post.com/forums/showthread.php?t=1972983.
...
Problem description : during mid-heavy throttle input there’s a massive jerk/knock/bang as soon as I lift off the throttle. Since mine’s a 6MT I can avoid the jerk by clutching in but I still notice the revs still shooting up even AFTER I lift off. From the logs you can see that it’s not because my foot is still on the throttle while stepping on the clutch, but something seems to keep the RPMs climbing and also maintaining boost.

I get the same thing, 'mid-heavy throttle' is exactly when it happens. I have an auto transmission and when I left off abruptly in second gear that's when I feel it most, though I wouldn't describe it as a 'bang' more of an aggressive jerk that definitely doesn't feel healthy for the drivetrain. If I take it above 6000 RPMs and let off the throttle it doesn't happen, also doesn't happen in 3rd (or higher) gears.

The post you linked above had a reply that said:

A "jerk", like the car setting back, when letting off throttle at a higher rpm after hard acceleration is pretty normal. Result of engine braking.

That's not correct and is definitely not normal, at least for what I'm experiencing. I know what engine braking feels like even from high RPMs and this feeling is not that. I have MHD v3.20 (Android) V10,0 Map - Stage 1 ACN91, no burbles, stock downpipes.

[Quick335XI]

Hi, just recently moved to a 6466 setup, Pulsar. My motor is built with ported race heads and titanium valve train, and I'm starting to wonder if even this turbo won't handle the motor... can someone take a look? "Which" WGDC column should I be looking at to determine the wgdc%? one column says like 70% and one says like 90% at one point, so I'm not sure... You can tell the boost starts "falling off" really far up high... thanks!

https://datazap.me/u/terryeaton/log-...og=0&data=3-23

[Sgop335]

Originally Posted by Quick335XI

Hi, just recently moved to a 6466 setup, Pulsar. My motor is built with ported race heads and titanium valve train, and I'm starting to wonder if even this turbo won't handle the motor... can someone take a look? "Which" WGDC column should I be looking at to determine the wgdc%? one column says like 70% and one says like 90% at one point, so I'm not sure... You can tell the boost starts "falling off" really far up high... thanks!

https://datazap.me/u/terryeaton/log-...og=0&data=3-23

Looks good, its the wgdc bank % so its up there...