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991.1 Turbo S boost pressure only 0.6 bar at WOT

991.1 Turbo S boost pressure only 0.6 bar at WOT

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Old 10-19-2018, 06:01 PM
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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.
 
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Old 10-20-2018, 07:54 AM
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Hello,

You have a big boost leak.

I suggest to check all intercooler hose clamps, ypipe clams, throttlebody clamps first.

If they are all good, you can look for Diverter valves to see if they have leak or their vacuum source is on.
 
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Old 10-20-2018, 10:29 AM
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Originally Posted by [email protected] View Post
Hello,

You have a big boost leak.

I suggest to check all intercooler hose clamps, ypipe clams, throttlebody clamps first.

If they are all good, you can look for Diverter valves to see if they have leak or their vacuum source is on.
Thank you Emre, I will book my car into my local Porsche dealer and tell them that I have a boost leak. I assume they'll be able to do a full boost test using their computer so hopefully it should flag up any boost leaks?
 
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Old 10-20-2018, 09:04 PM
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Let me know if I can help bud!
 
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Old 10-21-2018, 02:46 PM
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Originally Posted by [email protected] View Post
Let me know if I can help bud!
Thank you Sam 😉
 
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Old 10-21-2018, 04:41 PM
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They cant exactly see where its coming from just by looking at pc.

However it may be VTG actuator fault. Sometimes VTG rod pops out and cause low boost problem.

Since its a big loss in boost, it should be something obvious, like a VTG actuator rod, or a clamp loose or broken.
 
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Old 10-21-2018, 07:43 PM
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Originally Posted by [email protected] View Post
They cant exactly see where its coming from just by looking at pc.

However it may be VTG actuator fault. Sometimes VTG rod pops out and cause low boost problem.

Since its a big loss in boost, it should be something obvious, like a VTG actuator rod, or a clamp loose or broken.
had that happen to me, it was a busted actuator. replaced, reprogrammed, back in business .
 
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Old 10-25-2018, 07:10 AM
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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.
 
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Old 10-25-2018, 07:41 AM
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Originally Posted by Deadspool View Post
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.
Good luck and thanks for the update!
 
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