help making sense of stage 3 logs.

**Allaidback** · 11-09-2008 09:26 PM

Sorry guys...I just really don't understand these logs. It seems that the logs are very quick on wot...doesn't seem like it gathers enough info? Let me know. (Awe/giac stage 3 with fueling)

http://spreadsheets.google.com/ccc?k...7jlgBDaA&hl=en

http://spreadsheets.google.com/ccc?k...1r5nuhHHKVouSA

http://spreadsheets.google.com/ccc?k...1r6eRpAziJIeXg

**Allaidback** · 11-10-2008 06:42 AM

are the logs showing up?

**AudiSportB5S4** · 11-10-2008 07:17 AM

yeah they come up when you click the links.. how is the car running ? your logs have gaps in the RPM ranges its hard to really get a good idea of what's going on.... what kind of laptop are you using to log?

**Allaidback** · 11-10-2008 10:14 AM

Thats exactly what I was saying...I've tried 3 computers now and one with the ross-tech cable and they all display the same. When in wot, that's what all my logs look like, lots of gaps. My car is running great with no CEL...just wanted to make sure. I'll call ross-tech today. But from what you can tell is some of the values where they need to be?
*edit* My sample rate is only at 1.6-2.3. That's probably my issue...don't know how to adjust that though?

**AudiSportB5S4** · 11-10-2008 10:32 AM

OK... go into VAG... go into options on the bottom left of the first screen that appears.... in the middle of the screen you'll see "BLK INT" set to like 55 or something. Change that number to 25, its as low as it can go and it will sample MUCH faster. try that.

**Allaidback** · 11-12-2008 07:12 AM

What are you sampling at? I called ross-tech and spoke with andy and he said for a 2000 s4 the sample rate only goes to 3.5. I'm hitting 2.6 now, i've done everything you said and didn't change much. You think if I change the bits per second in the port properties that will make a difference? I'm at 9600right now.

**AudiSportB5S4** · 11-12-2008 07:15 AM

Originally Posted by Allaidback

What are you sampling at? I called ross-tech and spoke with andy and he said for a 2000 s4 the sample rate only goes to 3.5. I'm hitting 2.6 now, i've done everything you said and didn't change much. You think if I change the bits per second in the port properties that will make a difference? I'm at 9600right now.

it could... i just find that yours are extremely slow OK i just checked my numbers they go....

Start Baud 0 // KW2 Display 30 // TST Addr. -1 // Debug level 0

Blk Int 25 // Char Int 1 // KP2 time 25 // CAN timeout 0

what makes a big difference with VAG unfortunately is how many channels you log at once. If you try logging just ONE group/channel, you will see more data. It is the downside of logging with Vag

**AudiSportB5S4** · 11-12-2008 07:17 AM

and do you have the latest updates... Are you running the 805.1 ? You have a genuine cable right?

**Allaidback** · 11-12-2008 11:49 AM

I have the older software because I'm using an ebay cable, I tried it with my friends genuine cable and same thing. I'll post up another log with a single reading and see if it's any better. Thanks for your help.

**AudiSportB5S4** · 11-12-2008 12:00 PM

Originally Posted by Allaidback

I have the older software because I'm using an ebay cable, I tried it with my friends genuine cable and same thing. I'll post up another log with a single reading and see if it's any better. Thanks for your help.

no problem man. post it back up here i ll take a look.

**4RingsCircus** · 11-12-2008 01:06 PM

baud rate will definitely affect data transfer rate, as baud rate is the physical layer's actual transfer rate.

While there are compression methods to cram more data into the stream, you cannot use them here.

You are transferring 9600 BITS of data per second. that is a max of 1200 bytes of data per second. Great for BBS's during the 1990 to 1993 era, but not so much for any meaningful data. You will lose some to overhead. Each data plot would have like 10 to 20 bytes taken up. Remember this is PER SECOND, so that would explain the lack of 1/100 second intervals. If you get 10 samples across the wire per second, 10 samples would be a perfect world example, at 1/10 second per.

Summary:
9600 too low
Set port baud to 115200 on the laptop, and the program. A disparity can cause lost performance of failed communications.

Or:
Buy an actual VAG cable(USB) and use ECU X
EBAY cables were USB, I thought. If this is the case, simply crank the baud rate up in VAG com, and there is no setting on laptop, as it isn't a serial link.

**Allaidback** · 11-12-2008 09:47 PM

Thanx 4ringscircus...spent an hour messing around with it and then saw your post. I did exactly that and i'm logging at a constant 3.3 sample rate, compared to the 1.3 i was working with early. I set the usb baud rate to 921600, but the thing that made the difference was changing the latency timer under BM options to a lower setting. Thanks for the help guys...i'll post the logs later.
*I switched back over to just my brand new n-75 valve from my mbc and my car is only hitting 15si and holding reset the ecu and now 18psi and holding. (giac stage 3) No weird stuff with the boost, just will not spike or hold at the normal 21psi. I pressure testing and didn't find anything, but I figured it might not be a leak sense i'm not loosing any boost, the needle does not move off the 18psi reading to redline, but boost very slowly. With my mbc i was hitting 23psi and holding at 21psi and building boost
a lot faster. Already replaced the n-75...not it. Any suggestions? Obviously my boost log shows i'm not reaching requested boost...what block then should I log?