991.1 Turbo S boost pressure only 0.6 bar at WOT
10-19-2018, 07:53 PM
#1
991.1 Turbo S boost pressure only 0.6 bar at WOT
Hi All. I recently purchased a 991.1 Turbo S (a late 2013 model) Hi All. I recently purchased a 991.1 Turbo S (a late 2013 model with only 11,000 miles on the clock).
I wanted to ask what it the boost pressure when WOT? 9 times out of 10 I only see a maximum of 0.6 bar of boost when WOT in all three modes - normal, sport and sport + modes. That's 0.6 bar of boost when WOT throughout the rev range (most of the pulls I have done are from 3500RPM all the way to the red line in 3rd, 4th and 5th gears). Sometimes my turbo boost reading is displayed in orange which indicates the over boost function is activated but the boost doesn't surpass 0.5 bar of boost for the whole duration that I am WOT whilst it is orange.
The very few times that I have seen 1.0-1.2 bar of boost is from low speeds the majority of the time when in 1st and 2nd gear. But 9 times out of 10 I don't get past 0.6 bar of boost and the car feels much slower than when it slingshots forward at 1-1.2 bar. I have probably launched the car 30 times in a couple of weeks. I have a Dragy device and the best 62-124MPH (100-200KMH) time I can get is only 8.5 seconds.
As I understand I should experience between 0.9-1.0 bar of boost throughout the rev range.
Do I have a turbo boost issue? Any ideas what it could be?
Thank you in advance.
I wanted to ask what it the boost pressure when WOT? 9 times out of 10 I only see a maximum of 0.6 bar of boost when WOT in all three modes - normal, sport and sport + modes. That's 0.6 bar of boost when WOT throughout the rev range (most of the pulls I have done are from 3500RPM all the way to the red line in 3rd, 4th and 5th gears). Sometimes my turbo boost reading is displayed in orange which indicates the over boost function is activated but the boost doesn't surpass 0.5 bar of boost for the whole duration that I am WOT whilst it is orange.
The very few times that I have seen 1.0-1.2 bar of boost is from low speeds the majority of the time when in 1st and 2nd gear. But 9 times out of 10 I don't get past 0.6 bar of boost and the car feels much slower than when it slingshots forward at 1-1.2 bar. I have probably launched the car 30 times in a couple of weeks. I have a Dragy device and the best 62-124MPH (100-200KMH) time I can get is only 8.5 seconds.
As I understand I should experience between 0.9-1.0 bar of boost throughout the rev range.
Do I have a turbo boost issue? Any ideas what it could be?
Thank you in advance.
10-19-2018, 11:46 PM
#3
Instructor
Probably either a boost leak, or a malfunctioning waste gate. I had a boost leak on a BMW once, you could hear it.
Take it to the dealer, or a Porsche specialist. It can be fixed.
Take it to the dealer, or a Porsche specialist. It can be fixed.
10-19-2018, 11:48 PM
#4
Instructor
Either a boost leak, or a malfunctioning waste gate. If a boost leak, you should hear it after it builds a few pounds of pressure.
Take it to a dealer or Porsche specialist.
Take it to a dealer or Porsche specialist.
10-20-2018, 02:48 AM
#6
10-20-2018, 02:49 AM
#7
Yes that's what I thought initially but we haven't seen more than 15°C ambient temperature in the time I've driven it - in fact more like 10°C so I don't think it's weather/heat soak related. Thank you for your suggestion!
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10-25-2018, 09:10 AM
#8
Just an update - good news - just got a call from my local OPC to say that they have completed their diagnostics and have ordered a replacement turbo actuator which should resolve my boost issue 😁. Thank you for all of your help.
10-26-2018, 08:09 PM
#9
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