What is the max Boost on 957 Turbo S
#1
Drifting
Thread Starter
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So never really paid attention to my boost gauge in the car.
I noticed on WOT it pegs the gauge at 0,8 bar.
I thought I read that max boost is 1.9 bar on an 06 Turbo S (Can't find specs for my year) which is 0.3 bar higher than a regular Turbo. I assume ~1.0 bar is atmosphere and the gauge measures over that.
So am I reading this right? The max the gauge reads is 1.8 bar or is it 0.8 bar over current atmosphere, which could be 0.957bar for example
?
Or is my boost too high.
Thanks!
From Porsche for 2006, I dont see 2009 specs:
To provide such performance, Porsche engineers revised the engine control system’s throttle map, and installed larger intercoolers that improve volumetric efficiency by lowering the temperature of the air entering the V-8 engine’s intake tract. Thanks to the increase in the system’s cooling efficiency, engineers increased turbo boost pressure by 4.3 psi (0.3 bar) to a maximum of 27.5 psi (1.9 bar).
http://press.porsche.com/news/release.php?id=295
I noticed on WOT it pegs the gauge at 0,8 bar.
I thought I read that max boost is 1.9 bar on an 06 Turbo S (Can't find specs for my year) which is 0.3 bar higher than a regular Turbo. I assume ~1.0 bar is atmosphere and the gauge measures over that.
So am I reading this right? The max the gauge reads is 1.8 bar or is it 0.8 bar over current atmosphere, which could be 0.957bar for example
![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
Or is my boost too high.
Thanks!
From Porsche for 2006, I dont see 2009 specs:
To provide such performance, Porsche engineers revised the engine control system’s throttle map, and installed larger intercoolers that improve volumetric efficiency by lowering the temperature of the air entering the V-8 engine’s intake tract. Thanks to the increase in the system’s cooling efficiency, engineers increased turbo boost pressure by 4.3 psi (0.3 bar) to a maximum of 27.5 psi (1.9 bar).
http://press.porsche.com/news/release.php?id=295
#2
Burning Brakes
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1 bar is not atmosphere. 0 bar is atmosphere. ![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
As for the cause of your issue... I haven't the slightest. In my previous turbo cars it could be any of the following: boost leak, computer holding back boost, faulty gauge, wastegate stuck, blow off valve faulty, and on and on.
![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
As for the cause of your issue... I haven't the slightest. In my previous turbo cars it could be any of the following: boost leak, computer holding back boost, faulty gauge, wastegate stuck, blow off valve faulty, and on and on.
#3
Drifting
Thread Starter
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Hmm, then I don't get this gauge.
![](http://images.thecarconnection.com/lrg/2010-porsche-cayenne-awd-4-door-turbo-s-instrument-cluster_100253143_l.jpg)
Clearly says 0.4 0.8 and bar(well a , instead of a .)
I think my boost is fine, just don't get the readings on this.
![](http://images.thecarconnection.com/lrg/2010-porsche-cayenne-awd-4-door-turbo-s-instrument-cluster_100253143_l.jpg)
Clearly says 0.4 0.8 and bar(well a , instead of a .)
I think my boost is fine, just don't get the readings on this.
#5
Drifting
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
So never really paid attention to my boost gauge in the car.
I noticed on WOT it pegs the gauge at 0,8 bar.
I thought I read that max boost is 1.9 bar on an 06 Turbo S (Can't find specs for my year) which is 0.3 bar higher than a regular Turbo. I assume ~1.0 bar is atmosphere and the gauge measures over that.
So am I reading this right? The max the gauge reads is 1.8 bar or is it 0.8 bar over current atmosphere, which could be 0.957bar for example
?
Or is my boost too high.
Thanks!
From Porsche for 2006, I dont see 2009 specs:
To provide such performance, Porsche engineers revised the engine control system’s throttle map, and installed larger intercoolers that improve volumetric efficiency by lowering the temperature of the air entering the V-8 engine’s intake tract. Thanks to the increase in the system’s cooling efficiency, engineers increased turbo boost pressure by 4.3 psi (0.3 bar) to a maximum of 27.5 psi (1.9 bar).
http://press.porsche.com/news/release.php?id=295
I noticed on WOT it pegs the gauge at 0,8 bar.
I thought I read that max boost is 1.9 bar on an 06 Turbo S (Can't find specs for my year) which is 0.3 bar higher than a regular Turbo. I assume ~1.0 bar is atmosphere and the gauge measures over that.
So am I reading this right? The max the gauge reads is 1.8 bar or is it 0.8 bar over current atmosphere, which could be 0.957bar for example
![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
Or is my boost too high.
Thanks!
From Porsche for 2006, I dont see 2009 specs:
To provide such performance, Porsche engineers revised the engine control system’s throttle map, and installed larger intercoolers that improve volumetric efficiency by lowering the temperature of the air entering the V-8 engine’s intake tract. Thanks to the increase in the system’s cooling efficiency, engineers increased turbo boost pressure by 4.3 psi (0.3 bar) to a maximum of 27.5 psi (1.9 bar).
http://press.porsche.com/news/release.php?id=295
Boost numbers for 955 CTT and CTTS are about 1.6 and 1.9 bar respectively, however I too have not been able to find the numbers for the 957. I know that my 957 TT also pegs FSD on the boost gauge until about 5000 rpm.
#6
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1 bar is atmospheric pressure and presumably the gauge reads pressure over atmospheric while Porsche record their absolute intake pressure in their literature
1 bar is 14.503 psi 1.8 bar is 26.106 psi per googles conversion, it would seem that is the maximum that the factory gauge reads
With the information you have your gauge should go past its maximum.
1 bar is 14.503 psi 1.8 bar is 26.106 psi per googles conversion, it would seem that is the maximum that the factory gauge reads
With the information you have your gauge should go past its maximum.
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#10
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To answer your question, I a, not a mechanic, but at least should have same as the atmospheric pressure which is around 15psi.
If we increase the pressure boost to 1.6 or 1.8, what are the consequences on the V8 naturally aspirated engine?
If we increase the pressure boost to 1.6 or 1.8, what are the consequences on the V8 naturally aspirated engine?
#11
Rennlist Member
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There are no consequences on a naturally aspirated engine. It has no boost, that's why it is naturally aspirated.
#12
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There is no MAP sensor on the naturally aspirated?
honestly speaking, I increased the pressure to 1.6, the car seeems accelerating much easier and downsHifting differently, I can feel a boost in the car.
honestly speaking, I increased the pressure to 1.6, the car seeems accelerating much easier and downsHifting differently, I can feel a boost in the car.
Last edited by imalek; 12-04-2020 at 04:44 PM.