Solved - The Case of the Missing Boost

[spooltime]

While my CTTS was in the shop for the "Dash Gone Wild" repair, the very astute tech noted during a test drive that the boost gauge was only reaching 0.4 bar under full throttle, instead of the maximum of 0.8 bar it should have been attaining. A change-over valve and timed valve later, the missing boost is back. Major difference in power, and I was already impressed with what it had before the repair. Now, it just amazing. Check your boost gauge and make sure your engine is achieving it's rated boost.

Edited May 26, 2013 by spooltime

[feralc]

I have never seen 0.8 bar, only 0.6 (maybe 0.7 for just an instant) while upshifting (I compared it with a friends Cayenne and same thing), what is that change over valve process and how much is it?

[mcbit500]

I believe 2006 CTT and CTTS are capable of a maximum boost pressures of 1.6 bar and 1.9 bar respectively with the gauge reading only the portion above atmospheric pressure.

[feralc]

I believe 2006 CTT and CTTS are capable of a maximum boost pressures of 1.6 bar and 1.9 bar respectively with the gauge reading only the portion above atmospheric pressure.

So to understand you, if you are at sea level and the reading is 0.6 that means your boost is 1.6?? 1 Bar from the atmosphere and 0.6 from the turbos, BUT if you are at 1,000 meters above sea level, the reading will be less because the atmospheric pressure will be less?? So the turbos can't produce more than 0.6 bar? Edited May 26, 2013 by feralc

[hahnmgh63]

The Boost gauge reads net pressure above Sealevel. Absolute would be adding 1.0 bar approximately to whatever the guage reading is. Porsche used to advertise that their Turbo vehicles would sustain maximum boost up to approximately 5000' of elevation before starting to drop off. Not sure if this is still true or higher? Anyone from upper elevations chime in? Denver, SLC?