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Boost logs in VCDS

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Old 07-10-2012, 08:35 AM
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Here's a V2 beta 3rd gear pull log of boost for the APR tune:



In the past, I made 14psi at redline. With the V2, I make 14 psi at ~3k rpm... Bypass valve stays relatively closed. As per my podi boost gauge, I consistently hit 16psi (thanks to the "cool" weather here - high of 77F today LOL)
Old 07-10-2012, 09:28 AM
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Originally Posted by PsYkHoTiK
Here's a V2 beta 3rd gear pull log of boost for the APR tune:



In the past, I made 14psi at redline. With the V2, I make 14 psi at ~3k rpm... Bypass valve stays relatively closed. As per my podi boost gauge, I consistently hit 16psi (thanks to the "cool" weather here - high of 77F today LOL)

Is that graph:
18 - Engine Speed vs 345 - Intake Manifold Pressure Absolute, 608 - Charged Air Pressure Specified, and 621 - Bypass valve % ??

Nice info! I will try and make the same graphs this week. I made one on Sunday for a 3rd gear pull using charged air pressure specified in hPa to ~6500rpm but I didn't convert to PSI.
When I tried to 1800 hectopascal = 26.106792791 psi


Last edited by FatalBert; 07-10-2012 at 09:46 AM.
Old 07-10-2012, 10:09 AM
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Originally Posted by FatalBert
Is that graph:
18 - Engine Speed vs 345 - Intake Manifold Pressure Absolute, 608 - Charged Air Pressure Specified, and 621 - Bypass valve % ??

Nice info! I will try and make the same graphs this week. I made one on Sunday for a 3rd gear pull using charged air pressure specified in hPa to ~6500rpm but I didn't convert to PSI.
When I tried to 1800 hectopascal = 26.106792791 psi

You need to subtract 1000 from the 1800 and then multiply by 0.014503774 so your number in psi was 11.60
Old 07-10-2012, 10:53 AM
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Yup, need to subtract the atmospheric pressure.

And I believe those were the blocks used to create the graph.
Old 07-10-2012, 01:16 PM
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Originally Posted by primetime
You need to subtract 1000 from the 1800 and then multiply by 0.014503774 so your number in psi was 11.60
Originally Posted by PsYkHoTiK
Yup, need to subtract the atmospheric pressure.

And I believe those were the blocks used to create the graph.
Thanks guys.

So my logs definitely look stock then (I'm assuming).

I will be collecting a few more this weekend of my 3rd gear pulls.
Old 07-12-2012, 08:42 PM
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Don't forget this thread Fat. Lots of info here.

http://www.audizine.com/forum/showthread.php/474796-B8-S4-log-thread-Post-your-VCDS-logs-here
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