Cayenne Turbo boost gauge

[poleposition]

When I fully accelerate, kick-down, the turbo gauge shows about 0,4 - 0,5 bar... but it reads up to 0.8.

Does it ever go up to 0.8, or more than 0.5 ? how, when ?

[poleposition]

nobody ? :unsure:

[odix]

Re, "nobody?"

Umm, it is a holiday today in the US...

I have a Cayenne S, no turbo (obviously) but I'll ask my brother-in-law later who has the CTT.

Try launching in first gear (versus second -- move your shifter left into manual mode) from a dead stop on a slight uphill. With the accelerator floored go to redline -- see what your boost is right up to and immediately after the shift into second. You should see maximum boost reflected on the gauge.

Edited December 25, 2009 by odix

[david_yorkshire]

from memory, the highest I've seen it under full acceleration is 0.6 bar; when gear shifts occur, it does peak higher

Maybe it's fuel related - this was with 100RON fuel in the UK ?

[motobando]

Under full acceleration I regularly see 0,7 on mine (05 model). If yours does not hit 0,7 maybe your diverter valves are not working properly? I think 0,7 is the factory max...I could be wrong though.

[zmw]

Under full acceleration I regularly see 0,7 on mine (05 model). If yours does not hit 0,7 maybe your diverter valves are not working properly? I think 0,7 is the factory max...I could be wrong though.

I see about .6 - .65 but never .7 and that is on 93 octane, in cool weather...

Under high load, up hill i'll hit .65 and it comes back down to .6 pretty quickly - I'd like to attach a mechanical gauge as well to see how accurate the electronic dash gauge is...

[fireflyer]

I  see .8 regularly on my 06 CTTS, 93 octane.  104k miles

Edited April 25, 2017 by fireflyer

[lewisweller]

22 minutes ago, fireflyer said:

I  see .8 regularly on my 06 CTTS, 93 octane.  104k miles

Old post but yes E81 power pack and ctts have 0.8bar as opposed to 0.6-0.65bar for ctt. This is the main reason for the 50-70bhp increase the E81 and Ctts have over standard ctt. 

[Mr. Haney]

 I see that many people think that they should see a specific boost level in the Cayenne depending on which version/tune they have.

This is not the case. The Motronic 7.1.1 DME is a torque/load based system in which the DME is always trying to achieve a torque request target. There are boost tables that have preset limits based on what the manufacturer/tuner knows is safe for the engine combo. However, the short answer is that with so many variable on a day to day and region to region basis, boost levels will vary to hit the requested torque in any given situation- to a limit. With that being said, there are many variables that can affect boost pressure aside from requested torque.