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View Full Version : New to Logging and could use some help reading them.


MrFett
10-10-2019, 07:39 AM
My Car:

2015 S4
APR Dual Pulley
APR TCU Tune
APR Open Air Intake
Snow Performance Stage 1
Merc HX
JHM Test Pipes / JHM Catted Down Pipes / AWE Touring

Last night I grabbed three logs, the first one was without meth and the following two were with it on.
Note: I was spinning all 4 tires out of the box with about a 2 second 60 foot. It was cold and damp last night and I felt the DSG shift to 3rd pretty quick cause of the slippage.

Anyway, I don't know enough about logs to see what is going on with my loss in trap speeds (Around 110mph) last night. I dont know if its a fueling/heat/other issue and im getting sick of being slower than my single pulley times. Anyway if you all need more info let me know, ill attach the three logs. Thanks in advance.

EDIT:

Better uploaded logs:

https://datazap.me/u/mrfett/log-1570719457?log=0&data=0
https://datazap.me/u/mrfett/log-1570719457?log=1&data=3
https://datazap.me/u/mrfett/log-1570719457?log=2&data=3



Sorry, I didn't know where else to upload these in a pinch.
JoeAWD
10-10-2019, 07:48 AM
Try uploading them to https://datazap.me/
MrFett
10-10-2019, 08:00 AM
Try uploading them to https://datazap.me/


Thanks so much, here they are:

https://datazap.me/u/mrfett/log-1570719457?log=0&data=0
https://datazap.me/u/mrfett/log-1570719457?log=1&data=3
https://datazap.me/u/mrfett/log-1570719457?log=2&data=3
JoeAWD
10-10-2019, 09:57 AM
What are you logging with?
Rodizzle
10-10-2019, 09:58 AM
So unfortunately you could only log so much with a VCDS .

Your KNK was all over the place in that first log , meth definitely cleaned it up !! [emoji1417]

For logging fuel I’d use the following :

Give me a 1 thru 3 gear pull and a 3rd gear pull

Engine speed
Actual fuel rail pressure
Fuel pump: activation
Fuel pump: actual fuel pressure
Fuel rail pressure: specified
STFT 1
STFT 2
actual: bank1Lambda probes
actual: bank2
RFP_AV




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JoeAWD
10-10-2019, 10:06 AM
Your sampling is really bad, which is why I asked how you are making logs. Like 10 samples for a 1/4 pass is bad.

What I can see is your IAT are thru the roof at the end of your run (180f/80c) and you are getting some knock. I bet your bypass is opening cause of the high IAT.
Monkeyshok
10-10-2019, 04:20 PM
Your sampling is really bad, which is why I asked how you are making logs. Like 10 samples for a 1/4 pass is bad.

What I can see is your IAT are thru the roof at the end of your run (180f/80c) and you are getting some knock. I bet your bypass is opening cause of the high IAT.

I think MrFrett forgot to click on the turbo button before starting his vcds logs (turbo mode is limited to 10 variables and I see 12 in his logs). Its possible he didn't click the group UDS button as well in which case these logs could be pretty skewed. I have forgotten to hit group UDS a few times and noticed that the time stamps for each data point do not match up when looking at the data in excel.