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Porsche 911 991.2 boost pressure

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Old 06-02-2019, 08:19 PM
  #16  
Wujohn
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Video is shaky as heck but this shows how easy it is to get above 10 in 3rd. Two of the pulls were at highway speed and the third was from a much slower start; all in sports plus. Funny thing is last night when I was watching it regularly was sitting at 13 and today is sat mostly around 12 psi.

Old 06-04-2019, 03:35 PM
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SeeForce
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Originally Posted by Wujohn
Video is shaky as heck but this shows how easy it is to get above 10 in 3rd. Two of the pulls were at highway speed and the third was from a much slower start; all in sports plus. Funny thing is last night when I was watching it regularly was sitting at 13 and today is sat mostly around 12 psi.

https://www.youtube.com/watch?v=_nZO_0O7WCA
Hmmm. Mine does not go past 10.
Old 06-04-2019, 04:08 PM
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spdracerut
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Originally Posted by SeeForce
Hmmm. Mine does not go past 10.
The boost stays at 10psi until 4k rpms or so. It doesn't go higher until you get up to the top end of the rev range.
Old 06-04-2019, 04:09 PM
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spdracerut
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Originally Posted by Wujohn
Video is shaky as heck but this shows how easy it is to get above 10 in 3rd. Two of the pulls were at highway speed and the third was from a much slower start; all in sports plus. Funny thing is last night when I was watching it regularly was sitting at 13 and today is sat mostly around 12 psi.

https://www.youtube.com/watch?v=_nZO_0O7WCA

The ecu is very good at hitting torque target and making adjustments as necessary. If it's a bit cooler today, it doesn't need as much boost.
Old 06-04-2019, 06:39 PM
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PCA1983
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Originally Posted by Wujohn
I read on RL somewhere that boost pressure is determined by environmental factors like how far off sea level you are. I don't recall what my base gets to but it is certainly above 10 in 3rd. If I have time, I will wring mine out tomorrow and will let you know what I see...just because I want to be helpful
Just to set the record straight, at higher elevations, turbos can maintain full boost at fairly high altitudes, leaving NA cars at reduced power, gasping for air. I have not read anything lately, but remember one Denver owner of a 944T who was amazed at the power it had up to the high mountain passes west of Denver. Muscle cars with big NA V8's are dogs at those elevations.



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