2.0 TSI Possible Boost Leak with Logs

questions and chat about technical results
#1

Hi all.

I own a 2010 A3 sportback TSI 2.0T with stage 2 custom remap, downpipe, boost pipes, S3 intercooler and CTS intake and a GFB DV+.

Ever since i got it remapped i wasn’t happy with the way my logs looked.

N75 is maxed out and seems like boost could be better.

I haven’t pressure tested the system because i can’t find a decent mechanic in my area to do the test.

I did visually inspect all the connections of intake to turbo, turbo to intercooler and intercooler to TB and couldn’t find any leaks at all! I also tested my DV (GFB DV+) and it seems perfectly fine.

I am hoping to get some of the GURUs here to help me out with directions on how to further test / find the issue.

TBH i am suspecting the WG at this point.

Here’s the log : https://www.dropbox.com/s/2pxwcxnlaq86kb4/LOG-01-03F-20F-311-1148-115C-2.CSV?dl=0

#2

Forgot to mention I swapped the n75 for a new one.

#3

Who is doing the custom tuning?

#4

I am from Brazil. It’s a local tuner here. I am not happy with the tune but before going k04 or changing tunes I wanted to figure out the problem first.

#5

I tried to look at the logs and they came up not separated so I’ll have to look at them again. I will tell you how they look.

Until I can look at them what is your major concern. Are you getting codes or a cel. Or do you just think it might be an unsafe tune. Do you have a boost gauge.

#6

Thanks for trying to help out.

Well, the car does drive fine and there is no CEL or DTC to speak of.

Compared to other similarly spec’d cars mine feels a bit underpowered and by looking at the logs I see that teh n75 is maxed out during all wot pulls which doesn’t seem healthy and I see that the requested boost isn’t reached.

Basically, if I hadn’t been that anal about the car I wouldn’t even know I have a problem lol.

Maybe I am wrong and I really don’t, I am not expect at reading vcds logs so I am hoping for some more knowledgeable members to help me out make sense of what’s happening.

Btw, the atmospheric pressure were I live is around 1017 mbar.

#7

I do not have a boost gauge. I use torque to monitor boost usually.

#8

I will look at the logs again trying to load them with a different program. But if your not making your requested boost you should be getting a code for that. Kinda not good that your not seeing a code. Also there is a max limit to what the n75 can run at just so these things don’t happen. No codes and a maxed out n75 might not be a good thing. It might not be an issue either depending on what the logs look like. I’ll look again in a few hours. I will use a different program to open the file. That should help in the data being lined up

#9

thanks man! btw what programs are the out there to open the logs ?

i only know of this : http://vcviewer.com

#10

Or audilogs.com

Run by our very own Mistro

#11

niiiice! what a find!
awesome service, bookmarked and already using it full on! :slight_smile:

#12

Any issues, just make a post and PM Mistro, it’s a little side project of his but he put lots of work into it so I’m sure feedback welcomed

#13

OK looking over your logs and then comparing them to a standard 2.0t performance tune. There is definitely something wrong with your car you should be making way more boost much sooner. Your cat isn’t asking for anything crazy boost wise. I would look at your turbo after one pull I bet is glowing. If your don’t find out where the leak is you could do real damage to your turbo

Have you checked your pcv system

#14

Ok thanks. what do you mean look at the turbo after one pull?

I haven’t checked the pcv no, but I thought I should be seeing a code if a pcv fails.

I’ll also try to swap my dv for a new one, thinking maybe teh solenoid is shot.

#15

Small update, did a oil cap test today and the engine didn’t really care the oil cap is open.

Guess my PCV is shot, going to change it today and update here.

here’s a video of the test i’ve done :

https://www.dropbox.com/sc/039a068mm7drgi7/AAAggx4Zo4wGtTZjVnm5aXmWa

Good call on the PCV. hope it’s that and nothing else.

#16

I think he means it’s hot

#17

Here’s a new log, it looks better pos PCV change.

I do however think i still have something wrong going on looking at my N75 d.c

https://www.dropbox.com/s/yh5k96b85rggemf/LOG-24-10-2014-pos-pcv-cjange.CSV?dl=0

Where can i see a good performing stage 2 2.0T log ?