Vagcom block 115 logs

[QuA]

I was wondering if anyone has some logs of their block 115's. Specified and actual boost?

RPM Engine Specified Boost
2320 33.1 860
4720 116.5 1850
5000 147.4 1820
5040 151.9 1820
6000 132.3 1790
6560 121.1 1810
4800 154.1 1840
5200 146.6 1820
5560 139.1 1820
5880 135.3 1810
6160 127.8 1800
5400 139.1 1790
4720 154.9 1850
4800 145.1 1840
4960 140.6 1840
5120 140.6 1820
5240 142.1 1820
5360 142.1 1820
5520 141.4 1820
5640 141.4 1820
5720 138.3 1810
5840 135.3 1810
5960 133.1 1790
6080 133.1 1770
6160 128.6 1730
6240 127.1 1650
6320 126.3 1550
6160 129.3 1500
4760 135.3 1850
4800 152.6 1850

Is this showing under a 1bar of specified boost?

Thanks,

QuA

[Stonewall]

Re: Vagcom block 115 logs

Boost should be in mbar so yes you are showing over 1 bar other then when you are at 2320 RPM.

[QuA]

Re: Vagcom block 115 logs

Boost should be in mbar so yes you are showing over 1 bar other then when you are at 2320 RPM.

Yes im showing under a 1bar at 2300rpm but I thought you subtract 900-1000mbar for the atmo. changes.

Then the boost #'s dont look so hot. Correct me if im wrong.

[Stonewall]

Re: Vagcom block 115 logs

Then the boost #'s dont look so hot. Correct me if im wrong.

I can't help you on that one as I am jsut a diesel lover I am sure one of the 1.8T gurus would be able to tell you ie Kor

[Boy Racer]

Re: Vagcom block 115 logs

Try to hold it in gear from 2000 up. The only data you have is higher rpm where the requested boost drops off.

And yes, look for the atmos sensor in vag com and subtract that figure for your boost.

[1.8Trip]

Re: Vagcom block 115 logs

Mike, take a look at your other log - the one with the 3rd gear run. and yeah, you're supposed to correct for gauge vs. absolute pressure by subtracting the atmospheric pressure. Atmospheric pressure is usually 1000mbar and less at our altitude, but 1000mbar is a nice round number to work with.

[1.8Trip]

Re: Vagcom block 115 logs

Here's a quick graph I did using your 3rd gear run:



Something weird happened at 3300 rpm. It may have been you shifting into 3rd. I dunno...

[Boy Racer]

Re: Vagcom block 115 logs

Mike, take a look at your other log - the one with the 3rd gear run. and yeah, you're supposed to correct for gauge vs. absolute pressure by subtracting the atmospheric pressure. Atmospheric pressure is usually 1000mbar and less at our altitude, but 1000mbar is a nice round number to work with.

Agreed, nice and round but about .15 bar off which may be of significance here. Generally the off boost requested value is the same as the atmos sensor, so in this case is 860mBar. I am willing to bet that with the correct number and at around 3500 rpm, you will have a corrected boost of 1.1 bar.

[1.8Trip]

Re: Vagcom block 115 logs

Ok, here is your graph with Simon's 860mbar value plugged in:

... Generally the off boost requested value is the same as the atmos sensor, so in this case is 860mBar...

I didn't know that. That's really good info.

[Boy Racer]

Re: Vagcom block 115 logs

man, quick fire excel guy

a good way of comparing different chips, files etc. Providing they are each adjusted to their own atmos reading is to do a scatter plot of one group then add each other series with it's own rpm data as further x categories. It will pile all of the data points for each car/ program/ run on the same graph. You should take away points under full load though.

I did this for Qua's origional and the new file and all relavant points were higher. But there were only lower rpm points from his earlier program and this is where I can see that if he shows lower rpm points it should show some magic 1.1 bar hits!

[Boy Racer]

Re: Vagcom block 115 logs

Ok, here is your graph with Simon's 860mbar value plugged in:

I didn't know that. That's really good info.

It stands to reason when you think about it.....it is requesting the turbo not to do anything.. ie boost level = to atmos

[Kor]

Re: Vagcom block 115 logs

I have read (and according to my own experience) that if actual exceeds requested by either 1. a large amount or 2. over an extended period, you will trigger so called soft-limp, which (I think) is venting through the DV. There are other conditions that I believe can trigger it as well, such as too-rapid boost onset.

You should be okay with what I see in these graphs, but in case you are fiddling with getting more boost, or in case you do hit limp, here is my gathered wisdom.

I think (again from my experience) that #1 is about 2psi, so hitting 18+psi for more than a very short time will probably do it (on occasion). Obviously its okay over a short time, otherwise boost spikes would trigger it.

Also, in 5th it may take you longer to go from about 3700 to 5000 rpms, and even with this data it may be long enough to trigger condition #2. You are close and should be okay, but if you sustain any more boost, the MAP may inform the ECU of an overboost condition when you are driving. Definitely try 5th gear pulls from 3,000 to 5000+ rpms when testing your boost levels.

Just repeating some of my own experiences to keep in mind if you DO hit limp mode.

Possible fixes include fooling the MAP sensor and/or re-routing the DV feed. It might also be possible to use a program that just requests 20psi of boost at all times, then use a MBC instead of the N75 all the time to set your boost. Not sure if any company would be willing to make you this, since if you did use the N75, you would be running with open wastegate.

[QuA]

Re: Vagcom block 115 logs

Thanks for all the help Neil. Damn your quick. hehe.

My actual numbers really suck. After 5000rpms my car really just gives out.

Yikes.

QuA

[QuA]

Re: Vagcom block 115 logs

heh,

Maybe my initial spike is too much causing my timing to be all wacked. But the requested levels still seem low and actual looks hideous.

QuA

I have read (and according to my own experience) that if actual exceeds requested by either 1. a large amount or 2. over an extended period, you will trigger so called soft-limp, which (I think) is venting through the DV. There are other conditions that I believe can trigger it as well, such as too-rapid boost onset.

You should be okay with what I see in these graphs, but in case you are fiddling with getting more boost, or in case you do hit limp, here is my gathered wisdom.

I think (again from my experience) that #1 is about 2psi, so hitting 18+psi for more than a very short time will probably do it (on occasion). Obviously its okay over a short time, otherwise boost spikes would trigger it.

Also, in 5th it may take you longer to go from about 3700 to 5000 rpms, and even with this data it may be long enough to trigger condition #2. You are close and should be okay, but if you sustain any more boost, the MAP may inform the ECU of an overboost condition when you are driving. Definitely try 5th gear pulls from 3,000 to 5000+ rpms when testing your boost levels.

Just repeating some of my own experiences to keep in mind if you DO hit limp mode.

Possible fixes include fooling the MAP sensor and/or re-routing the DV feed. It might also be possible to use a program that just requests 20psi of boost at all times, then use a MBC instead of the N75 all the time to set your boost. Not sure if any company would be willing to make you this, since if you did use the N75, you would be running with open wastegate.

[QuA]

Re: Vagcom block 115 logs

Hey simon,

If the specified boost was asking for more would this curve my actual boost higher? Or is there something else I need to do to get my actual boost after 4500rpm's to follow the specified boost more?

The graph with the corrected 860mbar shows a spec spike of 14ish and then around 13 throughout the band.

QuA

man, quick fire excel guy

a good way of comparing different chips, files etc. Providing they are each adjusted to their own atmos reading is to do a scatter plot of one group then add each other series with it's own rpm data as further x categories. It will pile all of the data points for each car/ program/ run on the same graph. You should take away points under full load though.

I did this for Qua's origional and the new file and all relavant points were higher. But there were only lower rpm points from his earlier program and this is where I can see that if he shows lower rpm points it should show some magic 1.1 bar hits!