[Spoolsport]

Originally Posted by Saif2018

What way does it feel awful?

I'll list all symptoms in detail man. It's been like this for as long as I can remember

- Slow turbo spool. Massive amount of lag. Car sounds and feels like it's bogging down. It feels like I have a potato stuck in my exhaust blocking flow. It's hard to explain. I don't have any cats so that's ruled out.

- Wastegate rattle like crazy

- Exhaust sounds absolutely awful once I reach 3krpm

- Running mega rich. Strong smell from exhaust. Awful fuel economy!

- car will fall flat on its face when accelerating from 3rd gear. Power delivery feels naturally aspirated at times.

I've been to 12 damn mechanics! They all agree my car performs like crap yet they have no idea how to Fix it.

Could it be bad fuel in my area?

I have a smoke test booked next week at a dyno place. If they can't pinpoint what's wrong then I'm selling the car.

[Saif2018]

Originally Posted by Spoolsport

I'll list all symptoms in detail man. It's been like this for as long as I can remember

- Slow turbo spool. Massive amount of lag. Car sounds and feels like it's bogging down. It feels like I have a potato stuck in my exhaust blocking flow. It's hard to explain. I don't have any cats so that's ruled out.

- Wastegate rattle like crazy

- Exhaust sounds absolutely awful once I reach 3krpm

- Running mega rich. Strong smell from exhaust. Awful fuel economy!

- car will fall flat on its face when accelerating from 3rd gear. Power delivery feels naturally aspirated at times.

I've been to 12 damn mechanics! They all agree my car performs like crap yet they have no idea how to Fix it.

Could it be bad fuel in my area?

I have a smoke test booked next week at a dyno place. If they can't pinpoint what's wrong then I'm selling the car.

If the wastegates aren't closing properly when you go WOT it could be what's causing the lag, doesn't look like it from your log though, tightened the rods to see if it helps?

Have you thoroughly checked your exhaust system, downpipes for leaks?

Log cylinder 1 timing, also this is on v10 map, how does it run on v7 and v9 maps?

[jadams161]

So still battling a boost oscillation. I flashed back to mhd stock Stg 0 map.. The boost is up and down when I go wot. I keep checking things for a vacuum leak or boost leak. No codes. I'm at a loss. Just did boost solenoids and vacuum lines.. What am I missing??
https://datazap.me/u/jmadams/mhd-sto...og=0&data=3-18

[Saif2018]

Originally Posted by jadams161

So still battling a boost oscillation. I flashed back to mhd stock Stg 0 map.. The boost is up and down when I go wot. I keep checking things for a vacuum leak or boost leak. No codes. I'm at a loss. Just did boost solenoids and vacuum lines.. What am I missing??
https://datazap.me/u/jmadams/mhd-sto...og=0&data=3-18

20psi on stage 0, I don't think so mate lol.

Where is the boost oscillating?

That minor overboosting at WOT is normal, your tuner can probably tune it out. When you are Not WOT, boost will oscillate, that's normal, you won't be on boost target, slightly overboosting on shifting is normal too.

Log timing corrections on all cylinders, you only need timing crk for cylinder 1.

[feuer]

How can I post cvs file? Is telling me that isn’t supported.

[Spoolsport]

Originally Posted by Saif2018

If the wastegates aren't closing properly when you go WOT it could be what's causing the lag, doesn't look like it from your log though, tightened the rods to see if it helps?

Have you thoroughly checked your exhaust system, downpipes for leaks?

Log cylinder 1 timing, also this is on v10 map, how does it run on v7 and v9 maps?

Hi man. It runs just as bad on V7

I've pulled another log tonight and my STFT are almost maxing out! Would that be an 02 sensor issue?

https://datazap.me/u/boosty/log-1656...=11&mark=71-63

[Saif2018]

Originally Posted by Spoolsport

Hi man. It runs just as bad on V7

I've pulled another log tonight and my STFT are almost maxing out! Would that be an 02 sensor issue?

https://datazap.me/u/boosty/log-1656...=11&mark=71-63

Could be O2 related, but your AFR's aren't shooting up to 234 straight away after you go off throttle, Injectors could be leaking.

Pull the plugs and see if any smell of fuel or wet. Would be a good idea to visually check all the injectors as well whilst your at it.

[Spoolsport]

Originally Posted by Saif2018

Could be O2 related, but your AFR's aren't shooting up to 234 straight away after you go off throttle, Injectors could be leaking.

Pull the plugs and see if any smell of fuel or wet. Would be a good idea to visually check all the injectors as well whilst your at it.

Thanks man! So just a question, if my injectors were leaking would that cause massive loss of bottom end power and affect turbo spool?

[Saif2018]

Originally Posted by Spoolsport

Thanks man! So just a question, if my injectors were leaking would that cause massive loss of bottom end power and affect turbo spool?

Leaking injectors can cause rough running and drivability but, It's probably your wastegates, or some sort of a boost leak causing the loss of power.

Have a read through this link...

https://bmwtuning.co/bmw-n54-30ff-en...-repair-guide/

[lux_tv]

Hi all,

replaced injector in cylinder 1 ask spark plug had fuel on it- still having issues with rough idle. Will idle ok at cold start overnight- once warm it goes bad. No hesitation under load and no codes:

Idle: https://datazap.me/u/lukeacjm/idle-0?log=0&data=3-20

small runs: https://datazap.me/u/lukeacjm/small-...og=0&data=3-20

could it be bad pre-cat o2 sensors?

[Saif2018]

Originally Posted by lux_tv

Hi all,

replaced injector in cylinder 1 ask spark plug had fuel on it- still having issues with rough idle. Will idle ok at cold start overnight- once warm it goes bad. No hesitation under load and no codes:

Idle: https://datazap.me/u/lukeacjm/idle-0?log=0&data=3-20

small runs: https://datazap.me/u/lukeacjm/small-...og=0&data=3-20

could it be bad pre-cat o2 sensors?

Did you pull all the plugs and check for smell of any fuel or wet plugs?

Looks like your Injectors are still leaking, especially bank 1 as it's taking ages to shoot up to 234 after you lift off. STFT's are also maxing out.

[Noreezm]

Hi everyone, Just recently tuned my car to MHD stage 2+. I have just replaced the spark plugs, coils and injectors with index 12's. I also just got the primary o2 sensors replaced. I have all the proper supporting mods but sometimes my car misfires when it's cold. I'm at a loss here
https://datazap.me/u/ultrazapdos/mis...og=0&data=3-20

[dpaul]

Originally Posted by lux_tv

Hi all,

replaced injector in cylinder 1 ask spark plug had fuel on it- still having issues with rough idle. Will idle ok at cold start overnight- once warm it goes bad. No hesitation under load and no codes:

Idle: https://datazap.me/u/lukeacjm/idle-0?log=0&data=3-20

small runs: https://datazap.me/u/lukeacjm/small-...og=0&data=3-20

could it be bad pre-cat o2 sensors?

I'm surprised you don't experience "hesitation under load" because there are massive hrottle closures during every one of your brief WOT periods.

There is something wrong on bank 1 - as Saif2018 points out, the O2 values fail to rapidly return to 234 on accelerator pedal liftoff. That could be due to a lazy/dying O2 sensor or a leaky injector. You've already determined that cyl 1 had leaking injector and replaced that. So maybe others are bad as well on that bank. Warm start rough idle is not a classic leaky injector symptom but ok, one size does not fit all.

But the trim behaviors are hard to explain in terms of a leaky injector. To begin with AFAIK, elevated (positive) fuel trims indicate that the DME is ADDING fuel - not what you want to do with a leaking injector which is obviously already adding more fuel. OK, there are other injector failure modes besides leaking.

Furthermore, the LTFTs are very elevated at idle and decline with throttle and rpm. That's the classic behavior of in intake leak (not an injector leak). But your STFTs display exactly the opposite behavior, perhaps STFT compensating for the abnormal LTFTs under load.

For me, it's hard to put all this together. You might want to start by resetting O2 and idle adaptation (or all adaptations) and see what that does to the fuel trims before making any conclusions.

[TiAgAu]

Originally Posted by Noreezm

Hi everyone, Just recently tuned my car to MHD stage 2+. I have just replaced the spark plugs, coils and injectors with index 12's. I also just got the primary o2 sensors replaced. I have all the proper supporting mods but sometimes my car misfires when it's cold. I'm at a loss here
https://datazap.me/u/ultrazapdos/mis...og=0&data=3-20

Fuel pressure low is reading 0. Could be the sensor. Are you getting any codes?

[Noreezm]

Originally Posted by GovernUrMental

Fuel pressure low is reading 0. Could be the sensor. Are you getting any codes?

I have a 29F3 Code for the fuel pressure sensor, but I've had that code on since I've had the car.

[studio54]

Originally Posted by dpaul

I'm surprised you don't experience "hesitation under load" because there are massive hrottle closures during every one of your brief WOT periods.

There is something wrong on bank 1 - as Saif2018 points out, the O2 values fail to rapidly return to 234 on accelerator pedal liftoff. That could be due to a lazy/dying O2 sensor or a leaky injector. You've already determined that cyl 1 had leaking injector and replaced that. So maybe others are bad as well on that bank. Warm start rough idle is not a classic leaky injector symptom but ok, one size does not fit all.

But the trim behaviors are hard to explain in terms of a leaky injector. To begin with AFAIK, elevated (positive) fuel trims indicate that the DME is ADDING fuel - not what you want to do with a leaking injector which is obviously already adding more fuel. OK, there are other injector failure modes besides leaking.

Furthermore, the LTFTs are very elevated at idle and decline with throttle and rpm. That's the classic behavior of in intake leak (not an injector leak). But your STFTs display exactly the opposite behavior, perhaps STFT compensating for the abnormal LTFTs under load.

For me, it's hard to put all this together. You might want to start by resetting O2 and idle adaptation (or all adaptations) and see what that does to the fuel trims before making any conclusions.

I agree with this, either any int/exh leak before O2 sensors, either bad o2 sensors that mess calculations. Then DME detects it's lean, and adds up fuel to compensate (positives high LTFT values beyond reasonable limits).

[razvanf]

Hi guys,

N54 on Stage 1, no mods. Sometimes it's not making the requested boost (only 9-10psi instead of 13.5), it's happening randomly. When it happens WGDC doesn't jump up at WOT and stays slightly lower than normal, what do you think it could be? See the part after timestamp 248 in this log:

https://datazap.me/u/razvanfatu/log1...data=3-4-21-28

Once, I got a 30FC (charge air pressure too low) error code while doing a 60-100mph run in 6th gear on the motorway, but otherwise it runs fine.

[Saif2018]

Originally Posted by razvanf

Hi guys,

N54 on Stage 1, no mods. Sometimes it's not making the requested boost (only 9-10psi instead of 13.5), it's happening randomly. When it happens WGDC doesn't jump up at WOT and stays slightly lower than normal, what do you think it could be? See the part after timestamp 248 in this log:

https://datazap.me/u/razvanfatu/log1...data=3-4-21-28

Once, I got a 30FC (charge air pressure too low) error code while doing a 60-100mph run in 6th gear on the motorway, but otherwise it runs fine.

Can you do a 3rd gear log, that Datalog is quite messy, your going on and off the throttle, difficult to tell.

3rd gear log, DSC fully off, from 2500rpm to just over 6000rpm, Wide open throttle, (don't ease off) , shift into 4th, then back off

Goes without saying, do it in a safe place and time. Don't do it in the wet, in traffic or in cold conditions, with bad tyres etc.

[gordonab]

The car stumbles before shifts when under load. It looks like its shifting to Neutral (0) between shifts but I'm not sure if this is the cars way of compensating for another issue. The car is fully stock except for charge pipe/BOV. There are no CEL or codes.

https://datazap.me/u/gordonab/2008-n...?log=0&data=16

[Phoenixg]

when my alternator was on its way out, my car began to act up, and subsequently also felt slower. Stage 2+ ... monitoring on gauges and saw the following:
3rd - 9psi
4th/5th/6th 14psi

Boost target is 18.5/19 psi ... Update app today and retune the car. 3rd now gives me 14.5psi but wont give me 18.5 psi target ... used to feel so much faster.

No codes, so I guess im asking where should I start looking? Boost solenoids? Someone was mentioning my wastegates might be the issue.

I will post a log this evening when I get the chance as well

[geor21]

Hey guys, does this log look ok for 335i? Mhd stage 2+, Hybrid turbos,fmic,downpipes,stage 2 lpfp,n20 3.5b tmap sensor. https://datazap.me/u/geor21/log-1657...log=0&data=3-4

[witty]

this is my log if someone wants to let me know if it is a boost leak

https://datazap.me/u/tochez/log-1657...a=3-4-11-19-20