[minulache]

Hi guys,

I just installed MHD stage 1 on my N55 PWG but it seems it doesn't meet the boost target. Is this a possible boost leak?
Everything looks alright, except the STFT and boost under target which leads me to believe that there is a boost leak but my question is, shouldn't WGDC be 100% because it should be closed to meet the boost when a boost leak occurs or it's not a rule of thumb?
Attached the log.

https://datazap.me/u/minulache/stage...og=0&data=4-16

Many thanks for the help!

[thejeremyman9]

That amount of deviation does seem like a leak, yes.

WGDC doesnt read on a 0-100% scale for PWG like you would think. Even when you are "maxing" the turbo it wont read 100%. EWG is a bit different and does read more intuitively on a 0-100% scale but even for EWG it wont always shoot to 100% if you have a leak

[minulache]

Tried today to smoke test but I am smoking from the inlet pipe on the turbo, so that is not the cause of the boost leak...I cannot seem to get it to pressurize so I could actually see from where it's coming from. Any ideas from where to smoke test the N55?

View post on imgur.com

View post on imgur.com

[thejeremyman9]

I describe how to pressure test in this thread, there are various places you need to cap off when you try to pressurize from the inlet foward.

https://f30.bimmerpost.com/forums/sh....php?t=1621695

Also smoke alone might not work, you need pressure.

[minulache]

The problem is I don’t have an F30, I have an E92 (sorry, forgot to mention that) so I do not have that bung on the CP

[thejeremyman9]

I would check how the E92 is pressure tested then, i am not familiar enough with the differences to say

[minulache]

Update time. I replaced all the gaskets, no more leaks detected after the turbo but still same result on Stg 1: https://datazap.me/u/minulache/log-1...og=0&data=4-16

I also put Stage 1+ for curiosity on the car, and the boost seems a bit better, but still under target and negative STFT:https://datazap.me/u/minulache/log-1-2nd

Any other ideas...?

[thejeremyman9]

Have you looked at other peoples logs with your same vehicle/setup/tune to see how much deviation is normal?

[minulache]

I would say that based on the deviation that I see at other people this is normal for PWG cars. But the STFT is not really, I only saw on a few cars. I also put the logs into Virtual Dyno and the result is not that good.
Only 10whp stock vs stage 1+...

View post on imgur.com

[thejeremyman9]

Originally Posted by minulache

I would say that based on the deviation that I see at other people this is normal for PWG cars. But the STFT is not really, I only saw on a few cars. I also put the logs into Virtual Dyno and the result is not that good.
Only 10whp stock vs stage 1+...

View post on imgur.com

VD is a nice tool but you need very consistent logging conditions. As in the same road (no +/- grade), very similar ambient conditions, ideally the same tank of fuel to avoid timing differences, etc. You can do two runs back to back on the same tune and see +/- that much power just from inconsistent timing.

https://f30.bimmerpost.com/forums/sh....php?t=1710794

[minulache]

Thank you very much. Today I changed the gaskets from the intercooler and from the turbo outlet to intercooler and now it's holding boost as it should for a PWG, so problem solved

[minulache]

So, I noticed that now my boost is very good after all the changes BUT my WGDC hits 100%... any idea what I should look for? I think it's clear that there is no boost leak given the boost pressure now. Maybe the pressure converter or boost solenoid?

https://datazap.me/u/minulache/0906-...og=0&data=4-17

[thejeremyman9]

I suggest looking at other E series logs to see if thats normal. Your STFTs also go down to -22% which is quite a bit of correction.

[minulache]

Hi Jeremy, looked before also posting here and it is not normal. My next option is to try with a new pressure converter/boost solenoid. Other than that, I am a bit lost, not gonna lie.
Checked also the vacuum lines and they are all good.

[thejeremyman9]

Originally Posted by minulache

Hi Jeremy, looked before also posting here and it is not normal. My next option is to try with a new pressure converter/boost solenoid. Other than that, I am a bit lost, not gonna lie.
Checked also the vacuum lines and they are all good.

I believe F3x PWGs have some issues with those but you probably wont get much specific advice here for an E series TBH