[GearHead335i]

Originally Posted by HB E90

Get those bad boys installed and check all the lines while your at it. Then you'll be pushing some serious boost. I'm sure the WG's are at least part of the problem. Post back after please.

Will do thank you!

[GearHead335i]

Originally Posted by Saif2018

Worst case, yeah yours can be done for, if they don't stay shut the turbos can't build boost properly, That was the case for me before I had them uprated.

Heres a good guide to follow, if you tried everything else, and it's still off target, it's likely your wastegates aren't holding boost properly,

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

Yeah I am pretty sure it’s the wastegates, how do my WGDC look?

[lookalikehuuh]

Originally Posted by LA_BOOSTED

Interesting -- Timing pulls decreased with ~E30 on exact same map (MHD V9, 91Oct map Stage 1+), and IATs improved:

https://datazap.me/u/chris-ernst/mhd...-9-10-11-14-20

The same map, with 91oct:
https://datazap.me/u/chris-ernst/mhd...-9-10-11-13-20

Your in Los Angeles right? It could be that those timing corrections are because you loaded 91oct map instead of the ACN91 map. Arizona/California/Nevada (ACN) 91 is lower quality than other states so MHD includes a tune specifically for it that targets lower boost. Also for me in San Diego I tend to see less corrections on Shell or Chevron compared to other fuels. Shell tends to give me the least corrections but I'm sure mileage may vary depending on quality of each gas station.

[Saif2018]

Originally Posted by Quinnhogue7

Yeah I am pretty sure it’s the wastegates, how do my WGDC look?

Duty cycle looks a bit high, but if your wastegates rattling like crazy, I'd get uprated turbos fitted. Don't bother stripping turbo's and fitting uprated wastegates, waste of money. Just get those stage 2 turbos fitted, you will need a custom tune for it.

[LA_BOOSTED]

Originally Posted by lookalikehuuh

Your in Los Angeles right? It could be that those timing corrections are because you loaded 91oct map instead of the ACN91 map. Arizona/California/Nevada (ACN) 91 is lower quality than other states so MHD includes a tune specifically for it that targets lower boost. Also for me in San Diego I tend to see less corrections on Shell or Chevron compared to other fuels. Shell tends to give me the least corrections but I'm sure mileage may vary depending on quality of each gas station.

Ahhhhh wow! Good catch. Yes, in Los Angeles, and didn't realized the difference between 91Oct map and ACN 91.... Will swap maps back! Thank you for pointing this out!

[lookalikehuuh]

Originally Posted by LA_BOOSTED

Ahhhhh wow! Good catch. Yes, in Los Angeles, and didn't realized the difference between 91Oct map and ACN 91.... Will swap maps back! Thank you for pointing this out!

Oooorrrr... you could just run a E30 or E50 map and not worry about it. But before you do that change or upgrade your low pressure fuel pump It looks like the 91 tune alone is already pushing it to its limit.

I personally did a DIY Walbro 450 upgrade that I bought from summit racing, it was cheaper and much higher flow than just replacing with a standard OEM pump.

[alexpereap]

Hello guys,

Have a bmw 135i N55 engine, just flashed MHD stage 2+ and made some logs, can you help me with your feedback ?

https://datazap.me/u/alexpereap/stag...4-5-9-10-21-39
https://datazap.me/u/alexpereap/stag...4-5-9-10-21-39

I see the current boost after 4000rpm starts to drop and it's far from hitting the target boost. Also I see wgdc% is quite high, I wonder if both behaviors are normal due to my high altitude, (Live in Bogota: 8016ft, 10.91 psi ambient pressure). The WOT was made with DSC fully off.

Could it be a boost leak ? (don't think so as it hits 20psi at some point)
Maybe worn boost solenoid ?

Thanks in advance!

Hardware on car
- BMS air intake
- Catless downpipe
- Wagner Evo 1 FMIC
- 6 Eldor new coil packs
- 6 new ngk 2 step colder spark plugs

[Quick335XI]

I noticed the boost target is a bit off in this log; and seems to do that in another log too. Is 4psi alot of variance?

How does this log look also?

https://datazap.me/u/terryeaton/log-...og=0&data=3-21

[Saif2018]

Originally Posted by Quick335XI

I noticed the boost target is a bit off in this log; and seems to do that in another log too. Is 4psi alot of variance?

How does this log look also?

https://datazap.me/u/terryeaton/log-...og=0&data=3-21

Yes 4 psi is a lot off target, it should be close to target,

Probably a boost leak, check and replace vacumn lines, cannisters for cracks

Also worth checking charge pipe connections and diverter valves, IC hoses etc.

[Quick335XI]

Originally Posted by Saif2018

Yes 4 psi is a lot off target, it should be close to target,

Probably a boost leak, check and replace vacumn lines, cannisters for cracks

Also worth checking charge pipe connections and diverter valves, IC hoses etc.

How does this look - I'm assuming the large negative STFT means I'm now running rich? https://datazap.me/u/terryeaton/log-...og=0&data=3-20

How would detonation show up in a log btw?

[Saif2018]

Originally Posted by Quick335XI

How does this look - I'm assuming the large negative STFT means I'm now running rich? https://datazap.me/u/terryeaton/log-...og=0&data=3-20

How would detonation show up in a log btw?

No WGDC or LTFT?

Much better, boost and target are close, just over 1 psi

Yes it looks like its running a little rich, but it leans out higher up the rev range.

Your HPFP is consistently over 3k,

Have you asked your tuner to have a look?

[Quick335XI]

Originally Posted by Saif2018

No WGDC or LTFT?

Much better, boost and target are close, just over 1 psi

Yes it looks like its running a little rich, but it leans out higher up the rev range.

Your HPFP is consistently over 3k,

Have you asked your tuner to have a look?

Yes we're in the final stages of tuning, for some reason the boost hits a peak of around 29 or so which is great, but then we're trying to figure out why after that it falls off around 5k by about 3psi until i let out of the gas; it seems like it should stay close to 29 the whole time, that's what the target is. I had it checked for vaccum leaks recently they said it look good and the lines were updated not long ago and strong.

[Dave92N54]

Well, i've just about had it with N54T. I know they're not very friendly to non JB4 users but wow I often just get ignored. I am just about at my wits end with this issue. I have been chasing cold start misfires pretty much since August.

For starters, all injectors are now index 12, less than 10k on them, bank 1 less than 5k. NGK 97968s gapped at .022, new delphi coils, new valve cover + gasket, and I recently did a valve cleaning. I will admit, I was not able to get them spotless as my compressor is weak but they are significantly cleaner. I will be making another pass with a better compressor hopefully when it warms up. I have also reset adaptations twice now. I have also replaced every vacuum line I could find other than what goes to the wastegates. Unfortunately in this log I did not log WGDC but in all other logs they look fine.

I am fairly certain this issue is presenting itself (when warm, as the misfires only happen when cold) in the form of my AFRs and fuel trims, which lead me to believe it's a vacuum leak, however that would show itself as a boost leak, would it not? I hit boost target, if not a little above. I have two logs which i'll attach below, one is a 3rd gear pull into 4th with some decel, the other is idle directly after a cold start (rail pressure still high from cold start).

Logs here:
3rd gear pull: https://datazap.me/u/e92dave/3rd-gea...&data=3-23

idle: https://datazap.me/u/e92dave/high-st...&data=3-23

3rd gear pull was taken last night, i'm not worried about the timing corrections during the pull but you can see after the shift I get absolutely reamed by them. This was not happening until saturday when I pulled the plugs after sitting overnight, just to confirm no leaky injectors. Gaps were still good and I torqued them to the spec of 17lb-ft. Idle was taken this morning. Car is bone stock, not even a tune. I refuse to move on to tuning until i'm satisfied with this. Based on what i've seen in those logs, i'm somewhat leaning to 02s, as you can see what happens during shift/decel when the afrs should lean out. Does anyone else agree with this? I am still relatively new to data logging/troubleshooting issues like this. I really want to begin modding this car haha.

Edit: I forgot to mention, I'm very concerned with the stfts. I know they're not exactly cause for concern in the pull, since they're not maxed out and appear to be working but during the idle log I would consider that very high for idle. I have also wondered, could an issue/air leak in my pcv system show itself this way? Since I don't have any real issue with boost, i'm wondering if it's related to the actual PCV valve (which I have a new VTT valve), since from what I understand that valve is closed during boost, which would show itself more during idle. Just an idea. I appreciate any feedback.

Update: did some forum searching, after driving home today and immediately after shutting the car off I pulled the hose from the brake booster from the hose to the vacuum pump, I heard nothing. This would indicate a vacuum leak, right? I guess it's time for a smoke test.

[arek96]

Hey! Do you think there is any room for improvement?
https://datazap.me/u/in54nee92/log-1...solo=7-9-21-29

2008 335i fbo
inlets/outlets
stock rebuilded turbo (modified compressor and tubine wheel)
custom tune shell 100RON
bucketless walbro 450
xhp stage 3
2step colder spark plugs NGK
3.5 tmap

[Saif2018]

Originally Posted by arek96

Hey! Do you think there is any room for improvement?
https://datazap.me/u/in54nee92/log-1...solo=7-9-21-29

2008 335i fbo
inlets/outlets
stock rebuilded turbo (modified compressor and tubine wheel)
custom tune shell 100RON
bucketless walbro 450
xhp stage 3
2step colder spark plugs NGK
3.5 tmap

With E85 you can, but would recommend you don't push any further unless you plan on fitting stage 2 turbos, or don't care about having some degree of reliability.

Your WGDC is healthy/(low which is a good thing) and your pushing about 20 psi on pump gas.

[EvanP246]

Hi everyone. Here is my first OTS E30 log, tell me what you think.

https://datazap.me/u/evanp246/mhd-e3...0-11&zoom=3-72

My Car is a 2012 DCT N55 e92 (UK Market)
I have full bolt ons:

CSF intercooler
VRSF catless downpipe
VRSF Charge pipe
BMS Intake

Our pump fuel here in Barbados is about the same as ACN91 and I am using Fuse Racing Fuel E85. My mix is about a 3/4 tank of pump with the rest topped off with E.

Car feels strong, observed slight wheel spin in the damp in 4th during the pull.

Here is a pic of the car:

[Saif2018]

Originally Posted by EvanP246

Hi everyone. Here is my first OTS E30 log, tell me what you think.

https://datazap.me/u/evanp246/mhd-e3...0-11&zoom=3-72

My Car is a 2012 DCT N55 e92 (UK Market)
I have full bolt ons:

CSF intercooler
VRSF catless downpipe
VRSF Charge pipe
BMS Intake

Our pump fuel here in Barbados is about the same as ACN91 and I am using Fuse Racing Fuel E85. My mix is about a 3/4 tank of pump with the rest topped off with E.

Car feels strong, observed slight wheel spin in the damp in 4th during the pull.

Here is a pic of the car:

Attachment 2509630

If I'm reading this right, your boost psi takes a nose dive from about 4.5k rpm onwards and your WGDC hits 100% from 4.5k onwards as well, that's not good,

Your off boost target by about 4psi up top,

You need to log LPFP (fuel low pressure sensor) as well.

[EvanP246]

Originally Posted by Saif2018

If I'm reading this right, your boost psi takes a nose dive from about 4.5k rpm onwards and your WGDC hits 100% from 4.5k onwards as well, that's not good,

Your off boost target by about 4psi up top,

You need to log LPFP (fuel low pressure sensor) as well.

Thanks for your feedback. I suspect that my boost solenoid may be on the way out. (PWG car with 73000 miles).

How do I get my lpfp to log? I do not see a provision for it? This is an N55.

[Saif2018]

Originally Posted by EvanP246

Thanks for your feedback. I suspect that my boost solenoid may be on the way out. (PWG car with 73000 miles).

How do I get my lpfp to log? I do not see a provision for it? This is an N55.

N55, ok that explains why you couldn't log it.

Not sure how it can be read to be honest. Your HPFP seems good, so I would assume (going on a guess here) your LPFP should be ok, as I would expect a failing LPFP to drag HPFP down too.

It is likely you have a boost leak,

I would check and replace vacumn lines, check bov/diverter valve connections, charge pipe, IC connectiona to rule them out first, then boost solenoids, would also get the wastegate actuator rod checked, could be leaking boost as well.

[JunkyardDogg]

I flashed v8 Stage 1+ map tonight and went out to do some data logs. Cruising to the highway felt fine (30-40mph). I get on the highway, shift into 3rd, and start my log. I floor it and get some wheel hop and I feel the car struggling to maintain traction but I continue accelerating and shift to 4th at 6K rpm and immediately after I notice my car is stuttering/shaking under any acceleration! I was scared I wasn't gonna make it home. SES light came on. The more gas I give, the more it shakes. I even feel the gas pedal vibrating.

https://datazap.me/u/junkyarddogg/lo...og=0&data=3-20

[studio54]

Originally Posted by JunkyardDogg

I flashed v8 Stage 1+ map tonight and went out to do some data logs. Cruising to the highway felt fine (30-40mph). I get on the highway, shift into 3rd, and start my log. I floor it and get some wheel hop and I feel the car struggling to maintain traction but I continue accelerating and shift to 4th at 6K rpm and immediately after I notice my car is stuttering/shaking under any acceleration! I was scared I wasn't gonna make it home. SES light came on. The more gas I give, the more it shakes. I even feel the gas pedal vibrating.

https://datazap.me/u/junkyarddogg/lo...og=0&data=3-20

It happened to me in the past, shaking with orange engine light came on, it was misfire when i check it the DME code, but i stopped my car on the side, and started it again and it was smooth again.
Next time, if it does that, try to stop on the side if possible, stop engine, remove key, and restart engine

[JunkyardDogg]

Originally Posted by studio54

It happened to me in the past, shaking with orange engine light came on, it was misfire when i check it the DME code, but i stopped my car on the side, and started it again and it was smooth again.
Next time, if it does that, try to stop on the side if possible, stop engine, remove key, and restart engine

Yeah I freaked out since it was the first time. I was worried if I stopped the car i'd be stranded. Good to know!