[SatchNL]

Originally Posted by SatchNL

Thanks for the replies! After checking all vacuumlines and replacing the boost solenoids I think I have found the boost leak. The rear turbo wastegate is stuck open. If I disconnect vacuum to rear turbo nothing changes in the powerloss. If I disconnect vacuum to front turbo with rear turbo connected I have 0 boost. The actuator also does not move when I disconnect/connect the vacuum with engine running while I hear the vacuum change. By hand the rod is also hard to move. I will check tomorrow with a vacuumtester if I can get the rear wastegate to move freely again. Hopefully I can replace just the actuator without removing the turbo.

I got the wastegate flapper moving again with some WD40 and copper grease. The actuator is fine. Lets hope its stays moving freely. It's nice to have full boost again.

[oZades]

https://datazap.me/u/ozades/log-1686...49-52-43-32-31

I’m getting a misfire on WOT but no codes. Plugs have 5k miles. I tested the injectors and 5 are good but number 6 is leaking. I am also getting lots of timing corrections which I’ve never gotten on this e40 tune

[iqraceworks]

Just curious what everyone things of this log. It's a 3rd gear pull from my custom E40 tune that I've been running for a couple of years with no issue. Make great power, ran several high 10-second 1/4 mile passes on it last year.

This is also the same tune I was running a few months again when something happened in Cylinder #4....really low compression now, probably a broken ringland.

Anything in this tune stand out that might have contributed to the issue with the cylinder?

I'm guessing it was just bad luck, a weak cast piston, or an injector that could have leaned out for a split second.

https://datazap.me/u/iqraceworks/v4-...og=0&data=3-20

[AWD Addict]

Hey guys. This is my first MHD datalog, so hopefully I did it right. I can feel the car pulling timing on full throttle pulls. I've had some other issues that have prompted the following recent work:

1) New index 12 injectors
2) New HPFP, LPFP
3) New plugs

Car is stage 2+ with a 5.5" IC, catless DPs and charge pipe.

Being a novice, I can obviously see some substantial timing pulls by cyl. Boost looks okay, so I'm guessing I've got a fuelling issue (still, despite the recent fuel system work). Why is my throttle position so different than my accelerator position %?

Can you guys help me diagnose what to look at next?

https://datazap.me/u/awdaddict/awdad...?log=0&data=20

Is it normal for my lpfp to be varying so wildly? Also, looking at iq's log in the post above, his :rail pressure hits 3000 twice. Mine never gets above 2660. I'm not sure what fuel pump mods he's made, so perhaps that's not an unusual comparison.

[selander]

https://datazap.me/u/mattiasselander...=10-20&solo=10

My log with n55 stage 1 95ron bone stock car.

If I'm going to start modifying the car a bit, what are the most important parameters to keep track of. Fairly new with this modifying cars. Iat is good to hold down so a fmic is ordered.

[BizFizz]

I took this long after I bought the car. It's setup with a single turbo and only hitting 10PSI of the 18PSI target. The timing also goes to -3. Is this caused by not hitting the boost target?

I found out that the MAC solenoid installed on the car is missing the wires that go from the solenoid to the OEM boost solenoid connector. Is this what is causing all of my problems? TIA, Log is posted and I can take more if needed.

https://datazap.me/u/bizfizz/log-169...=0&data=3-5-20

[AWD Addict]

Originally Posted by AWD Addict

Hey guys. This is my first MHD datalog, so hopefully I did it right. I can feel the car pulling timing on full throttle pulls. I've had some other issues that have prompted the following recent work:

1) New index 12 injectors
2) New HPFP, LPFP
3) New plugs

Car is stage 2+ with a 5.5" IC, catless DPs and charge pipe.

Being a novice, I can obviously see some substantial timing pulls by cyl. Boost looks okay, so I'm guessing I've got a fuelling issue (still, despite the recent fuel system work). Why is my throttle position so different than my accelerator position %?

Can you guys help me diagnose what to look at next?

https://datazap.me/u/awdaddict/awdad...?log=0&data=20

Is it normal for my lpfp to be varying so wildly? Also, looking at iq's log in the post above, his :rail pressure hits 3000 twice. Mine never gets above 2660. I'm not sure what fuel pump mods he's made, so perhaps that's not an unusual comparison.

So I switched maps to the 91 octane, and the timing pulls are far fewer and less severe. Still there though. I haven't logged yet (too many cars on the road for a pull), but I will.

Either way, that to me seems to support this a fueling matter. I'm using Sunoco 93, so I doubt it's the gas. Even if the gas isn't perfect, I feel like 6-7degree timing corrections is still way too much.

Does anything stand out on that log fuelling wise that could intimate what my underlying issue is?

[Sgop335]

Originally Posted by AWD Addict

So I switched maps to the 91 octane, and the timing pulls are far fewer and less severe. Still there though. I haven't logged yet (too many cars on the road for a pull), but I will.

Either way, that to me seems to support this a fueling matter. I'm using Sunoco 93, so I doubt it's the gas. Even if the gas isn't perfect, I feel like 6-7degree timing corrections is still way too much.

Does anything stand out on that log fuelling wise that could intimate what my underlying issue is?

your afrs look ok, fuel pressures look ok. Iats are getting hotter which can be improved.
Is any e85 available?
Timing corrections can also be caused due to a hot plug

[AWD Addict]

Super helpful. Thanks for posting.

It was a pretty hot day, and the car had some heat soak not long before the pull. I'll definitely look into that. As for the hot plug, they'd all have to be hot based on that log, right? I feel like that's some wildly unlikely bad luck.

I guess I'm just surprised at how much correction is being applied on 93 octane, which that map is allegedly tuned for (assuming that there are no other fuel system issues anyways).

[Sgop335]

Originally Posted by AWD Addict

Super helpful. Thanks for posting.

It was a pretty hot day, and the car had some heat soak not long before the pull. I'll definitely look into that. As for the hot plug, they'd all have to be hot based on that log, right? I feel like that's some wildly unlikely bad luck.

I guess I'm just surprised at how much correction is being applied on 93 octane, which that map is allegedly tuned for (assuming that there are no other fuel system issues anyways).

Hot plugs mean heat range of the plug. What plugs are in there? If its the colder ngk then ok, oem bosch could be hot for your boost.
If there are any misfires you experience, ( not visible in log) that would be a gap and coil thing.
93 oct maps are susceptible to corrections esp. at high boost and high iats. E85 helps that. Octane boosters like klotz could help.
If a specific cylinder (s) is having timing corrections then arguably it can have an injector issue and running lean. It will not show on a collective bank basis, but spark plug color is a good indicator. Doesnt seem to be above.

Log also shows Overboosting resulting in throttle closures.
Also, stfts are quite negative may be fuel adap reset could help

[lookalikehuuh]

Originally Posted by AWD Addict

Super helpful. Thanks for posting.

It was a pretty hot day, and the car had some heat soak not long before the pull. I'll definitely look into that. As for the hot plug, they'd all have to be hot based on that log, right? I feel like that's some wildly unlikely bad luck.

I guess I'm just surprised at how much correction is being applied on 93 octane, which that map is allegedly tuned for (assuming that there are no other fuel system issues anyways).

I would suggest try running that fuel down pretty low and go fill up with Shell or Chevron fuel and try a log again. I have no experience with Sonoco since its not a common brand out here in california, but Shell and Chevron have always given me the least issues with timing corrections. Which spark plugs did you use?

[AWD Addict]

Originally Posted by Sgop335

Hot plugs mean heat range of the plug. What plugs are in there? If its the colder ngk then ok, oem bosch could be hot for your boost.
If there are any misfires you experience, ( not visible in log) that would be a gap and coil thing.
93 oct maps are susceptible to corrections esp. at high boost and high iats. E85 helps that. Octane boosters like klotz could help.
If a specific cylinder (s) is having timing corrections then arguably it can have an injector issue and running lean. It will not show on a collective bank basis, but spark plug color is a good indicator. Doesnt seem to be above.

Log also shows Overboosting resulting in throttle closures.
Also, stfts are quite negative may be fuel adap reset could help

Ah. I misunderstood you. I'm running the stock bosch plugs, so I'll definitely consider one step colder plugs next service. I never really thought that would have any meaningful impact at this level of tuning.

I'll definitely look at the stfts and adaptations. Good suggestions there too.

[lowrydr310]

Originally Posted by lookalikehuuh

I would suggest try running that fuel down pretty low and go fill up with Shell or Chevron fuel and try a log again. I have no experience with Sonoco since its not a common brand out here in california, but Shell and Chevron have always given me the least issues with timing corrections. Which spark plugs did you use?

Sunoco is very high quality fuel, especially their 93 octane. In fact I had a local station that had 94 octane which I used to run back in my old turbo DSM days.

[AWD Addict]

Originally Posted by lowrydr310

Sunoco is very high quality fuel, especially their 93 octane. In fact I had a local station that had 94 octane which I used to run back in my old turbo DSM days.

That's what I thought. Their old 94 was killer in my tuned WRX days. I'll post up the logs on the same tank and 91 tune this weekend.

[NotHarryField]

Hi all,

Please may someone take a look over my logs? Specifically it's my boost psi vs boost target psi which is why I'm reaching out;

https://datazap.me/u/notharryfield/l...ta=3-24&solo=3
https://datazap.me/u/notharryfield/l...og=1&data=3-24

My setup;
2007 335i (N54), 64k miles
Stage 2 MHD (93 OCT map, V10)
VRSF downpipes
VRSF DCI's
Rest of car stock other than charge pipe

My boost psi seems to be strange, I've seen others with boost leaks but it is more consistent and obvious than what my logs show - it seems to get to the right boost level and then go up / down and taper off to redline. I replaced my boost solenoids last week but it did not help.

I did some logs a few months ago with the exact same config which did not have this fluctuation / taper but annoyingly it was on my old phone I no longer have - does it just look like a boost leak?

Massively appreciate any advice and happy to add any info if needed.

Cheers!

[oZades]

https://datazap.me/u/ozades/log-1690...?log=0&data=21

I'm getting some crazy afrs for bank 2, hitting over 30. I am getting o2 sensor codes for both banks even after replacing the primaries. The engine also sounds really weird, like a rumbling sound on idle almost like a dirt bike.

Anything in this log that can point me in the right direction?

[AidanN335iDCT]

https://datazap.me/u/aidan335dct/2nd...og=0&data=3-21

335i N54 DCT
MHD Stage 1+ 95RON tune, running 97 oct e5 fuel
VSRF charge pipe, DCI, 5.5" FMIC

[The_E92_Fan]

Originally Posted by oZades

https://datazap.me/u/ozades/log-1690...?log=0&data=21

I'm getting some crazy afrs for bank 2, hitting over 30. I am getting o2 sensor codes for both banks even after replacing the primaries. The engine also sounds really weird, like a rumbling sound on idle almost like a dirt bike.

Anything in this log that can point me in the right direction?

Could be a vacuum leak? Test the vacuum off the manifold or get a readout of boost at idle through MHD and report back.

[oZades]

Originally Posted by The_E92_Fan

Could be a vacuum leak? Test the vacuum off the manifold or get a readout of boost at idle through MHD and report back.

MHD is reading -8.3 on idle

[Kieran411]

Hey hopefully someone can check these logs. Not good with understanding the tuning and setpoint side of things. E93 335i RHD Auto 6HP
Pretty much had China 19ts and Bank 2 siezed.
Fit some FCP stock mitsubishi turbos and have encountered Compressor surge at 3psi and up.
logs underboost and overboost after a while.
Catless DPs, Silicone inlets, upgraded intercooler and piping. 98RON
Have flashed it with MHD 20minute remove on a new phone, stage 0 and stage 2+.
i have gone through everything mechanical and it all looks ok. smoke, pressure test. compression etc.
I've fit known good throttle body, Boost solenoids, MAP and Intake sensor. with no change.

https://datazap.me/u/kieran411/savvge-2?log=0&data=3-21
https://datazap.me/u/kieran411/savvge?log=0&data=3-21
one log is stage 2+ and the other is stage 0

Thanks

[TiAgAu]

Originally Posted by Kieran411

Hey hopefully someone can check these logs. Not good with understanding the tuning and setpoint side of things. E93 335i RHD Auto 6HP
Pretty much had China 19ts and Bank 2 siezed.
Fit some FCP stock mitsubishi turbos and have encountered Compressor surge at 3psi and up.
logs underboost and overboost after a while.
Catless DPs, Silicone inlets, upgraded intercooler and piping. 98RON
Have flashed it with MHD 20minute remove on a new phone, stage 0 and stage 2+.
i have gone through everything mechanical and it all looks ok. smoke, pressure test. compression etc.
I've fit known good throttle body, Boost solenoids, MAP and Intake sensor. with no change.

https://datazap.me/u/kieran411/savvge-2?log=0&data=3-21
https://datazap.me/u/kieran411/savvge?log=0&data=3-21
one log is stage 2+ and the other is stage 0

Thanks

What issue are you having exactly? Logs are not the best tbh. Your hardly over 30-40% accel pedal. You need to enable auto log in MHD, you need to go 3rd gear WOT from 2500rpm to 6000rpm

Choose Metric units for Aussies

[Kieran411]

Originally Posted by TiAgAu

What issue are you having exactly? Logs are not the best tbh. Your hardly over 30-40% accel pedal. You need to enable auto log in MHD, you need to go 3rd gear WOT from 2500rpm to 6000rpm

Choose Metric units for Aussies

Here is a short video.
https://youtube.com/shorts/A1MOySA9Hfg?feature=share

when I'm accelerating from as low down as 3-4psi the vehicle starts surging.
In the log https://datazap.me/u/kieran411/savvg...ta=2-3-4-13-21
Around 120-135 seconds is the compressor surge as above in the video.
On and off it can sometimes hit a boost target of 18psi and others it will target 18 but make 8psi.

I have pressurised the intercooler system up to 20psi with no leaks.
Smoke tested everything.
Removed BOVs and blocked
Removed intake manifold and inspected ports/valves. were ok
Swapped Map, IAT sensor, throttle body, boost solenoids, DME/cas from a stock 335i.
Vacuum supply is ok.
Compression is 160psi across all 6
spark plugs and coils are ok. (doesn't log fault nor does it pre-detonate or misfire under load)
Removed the exhaust system and road tested.

I'm thinking one of the new turbos from FCP have a manufacturing defect.
At idle/ light rev up to 2000rpm you can hear a turbo spooling.

I'll put the car together and record further.