[Cyberdemon]

Didn't want to hijack others threads, but could use some help/thoughts.

I have a N55 335i which is completely stock except for a VRSF charge pipe. Installed the Stage 1 maps (both 93 and then 91) and noticed I am hitting about 12psi low in the range and then quickly tapering back down to around 9-10psi.

This is my first time looking through logs so I'm trying to decide what to look at next. I removed and reseated the charge pipe to look for any obvious leaks. I purchased a boost leak tester and will double-check for leaks later in the week, but am not sure if these logs indicate an issue with a leak or possibly a wastegate or something else. The WGDC numbers seem to be a lot lower than what I have seen on other folks logs, but I have read those numbers may be less important depending on the adjustment of the wastegate. There are no codes and didn't notice any stored. I inspected the turbos for any obvious signs of oil leaks or other issues but didn't see anything. Car has 76k on the odometer so not super high mileage. I do suspect the previous owner might have had a JB4 since the clips on the ECU cover are cracked off unless it was removed for something else.

Here are 2 logs as well as one showing stage 0.

Stage 0:
https://datazap.me/u/cyberdemon/log-...og=2&data=3-11

Stage 1 - 91 octane 2-3 pull (Car had a fresh tank of Mobil 93)
https://datazap.me/u/cyberdemon/log-...=1&data=3-4-11

Stage 1 - 91, 2nd gear only.

https://datazap.me/u/cyberdemon/log-...=0&data=3-4-11

Any thoughts are appreciated!

[njang92]

Pretty significant timing corrections throughout the whole pull. 7deg on cyl6 at some places.

You do plugs/coils before flashing?

[Cyberdemon]

Originally Posted by njang92

Pretty significant timing corrections throughout the whole pull. 7deg on cyl6 at some places.

You do plugs/coils before flashing?

Plugs were 15K ago, but I just ordered new coils, plugs and a boost leak tester to see if there's any other leaks.

Will install it all when the heat dies down and see how it goes.

[Cyberdemon]

Originally Posted by njang92

Pretty significant timing corrections throughout the whole pull. 7deg on cyl6 at some places.

You do plugs/coils before flashing?

Replaced the plugs and coils - looks like I got back between 2-3 PSI higher in the range but still a little below target. Weather has been super hot, will let the car adapt for a bit and see if it continues to improve.

[yupetc]

Originally Posted by Cyberdemon

Replaced the plugs and coils - looks like I got back between 2-3 PSI higher in the range but still a little below target. Weather has been super hot, will let the car adapt for a bit and see if it continues to improve.

Not very common, but do check how tight the injectors are sitting in their ports right now. If one can easily be wiggled out, you may have a blow-by leak there. That's what happened to me, not able to hit tuned boost targets and WOT also gives me a fit. I ended up having to re-sleeve a new port to make it tight again. I was lucky to see quite a few of these issues on N54 folks' boost leaks; then found the same on my car. Your data doesn't look that way, but just something to think about if all other possibilities have been explored to no avail.

[Cyberdemon]

Originally Posted by yupetc

Not very common, but do check how tight the injectors are sitting in their ports right now. If one can easily be wiggled out, you may have a blow-by leak there. That's what happened to me, not able to hit tuned boost targets and WOT also gives me a fit. I ended up having to re-sleeve a new port to make it tight again. I was lucky to see quite a few of these issues on N54 folks' boost leaks; then found the same on my car. Your data doesn't look that way, but just something to think about if all other possibilities have been explored to no avail.

Thanks, when removing the old coils they all felt pretty tight. Installing the new ones it seemed impossible to get them in quite as hard. I put the new plugs in to the recommended torque, is it possible something else would prevent them from seating fully? There wasn't an obvious gap between the upper seal and the valve cover, and it does seem to be running OK but wondering if the plugs weren't as tight as needed or something else was up?

Car seemed to be running better with the new coils otherwise. Thinking about moving to the 93 map and seeing how close it gets to the higher target.

[yupetc]

Originally Posted by Cyberdemon

Thanks, when removing the old coils they all felt pretty tight. Installing the new ones it seemed impossible to get them in quite as hard. I put the new plugs in to the recommended torque, is it possible something else would prevent them from seating fully? There wasn't an obvious gap between the upper seal and the valve cover, and it does seem to be running OK but wondering if the plugs weren't as tight as needed or something else was up?

Car seemed to be running better with the new coils otherwise. Thinking about moving to the 93 map and seeing how close it gets to the higher target.

The coils are friction seal, and at times, it'd be hard to push all the way down if it's completely dry. For my case, I've at times rub in a bit of di-electric grease in there. And the way I tell if I got it tight enough is I would try to pull it out by hand and it's almost impossible. That's a tight seal. Usually I'd have to use a 3/8" extension to hook the tab/ring and pivot it out. But yeah, it can seat in not-all-the-way-down, and that'll create some issues.

[Cyberdemon]

Originally Posted by yupetc

The coils are friction seal, and at times, it'd be hard to push all the way down if it's completely dry. For my case, I've at times rub in a bit of di-electric grease in there. And the way I tell if I got it tight enough is I would try to pull it out by hand and it's almost impossible. That's a tight seal. Usually I'd have to use a 3/8" extension to hook the tab/ring and pivot it out. But yeah, it can seat in not-all-the-way-down, and that'll create some issues.

Thanks. I need to pull that area apart again for some other maintenance soon, will check to see if they've tightened up or any are still loose.