991.2 Carrera Cobb Tuning issue
#1
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hey guys,
so ive ran into a little problem and I’m looking for help..
I ordered the Cobb Tune AP for my 2017 911 Carrera. I had in on the car for roughly 3 weeks with no issues. Then all of a sudden I noticed a lack of power with both stage 1 maps and the factory tune. I sent data logs to Aaron at Cobb Tuning and he also stated it was slightly degraded in power overall. Anybody with these tunes knows it’s night and day difference in power between factory and tuned. So, at this point I uninstalled the tune, and brought it in to Porsche to diagnose, now keep in mind even uninstalled I was only reaching around 8-9 psi boost where factory is around 13psi. They diagnosed it, and later told me it was ready to be picked up, I found out that they replaced the ECU under warranty stating that it had a faulty circuit and they also noticed it was reflashed but did not care. During the drive home from Porsche, it was reaching full factory boost so I figured everything was fixed...
I called up Cobb and sent the new ECU out to get unlocked again, I reinstalled the new ECU and flashed the stage 1 91 octane map, long behold it’s only reaching around 15 psi, spools faster but doesn’t overall feel much faster than factory tune, so what’s your guys thoughts? What should I look for next? I believe there is a weak link in the turbo/intercooler system. Is anyone else having issues? I can’t be the only one out there experiencing any type of issue
thanks guys!![surrender](https://rennlist.com/forums/graemlins/surrender.gif)
so ive ran into a little problem and I’m looking for help..
I ordered the Cobb Tune AP for my 2017 911 Carrera. I had in on the car for roughly 3 weeks with no issues. Then all of a sudden I noticed a lack of power with both stage 1 maps and the factory tune. I sent data logs to Aaron at Cobb Tuning and he also stated it was slightly degraded in power overall. Anybody with these tunes knows it’s night and day difference in power between factory and tuned. So, at this point I uninstalled the tune, and brought it in to Porsche to diagnose, now keep in mind even uninstalled I was only reaching around 8-9 psi boost where factory is around 13psi. They diagnosed it, and later told me it was ready to be picked up, I found out that they replaced the ECU under warranty stating that it had a faulty circuit and they also noticed it was reflashed but did not care. During the drive home from Porsche, it was reaching full factory boost so I figured everything was fixed...
I called up Cobb and sent the new ECU out to get unlocked again, I reinstalled the new ECU and flashed the stage 1 91 octane map, long behold it’s only reaching around 15 psi, spools faster but doesn’t overall feel much faster than factory tune, so what’s your guys thoughts? What should I look for next? I believe there is a weak link in the turbo/intercooler system. Is anyone else having issues? I can’t be the only one out there experiencing any type of issue
thanks guys!
![surrender](https://rennlist.com/forums/graemlins/surrender.gif)
#2
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I'd honestly uninstall everything and sell. Seems like it's not working out for your car. How can you have this problem again just to come to the dealer and say "oh hey yeah I need another ECU hurr durr".
Maybe try a different tuning company. As much as I like Cobb, I must say their customer service for the Carrera market is the worst I've seen. Every other 911 and every other platform gets better treatment.
My accessport constantly spits out strange CELS and they go away. The scantool doesnt work most of the time and it never clears codes. When I ask Cobb i hear crickets.
Maybe try a different tuning company. As much as I like Cobb, I must say their customer service for the Carrera market is the worst I've seen. Every other 911 and every other platform gets better treatment.
My accessport constantly spits out strange CELS and they go away. The scantool doesnt work most of the time and it never clears codes. When I ask Cobb i hear crickets.
#3
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I guess another tuning company could be better and sometimes the grass is greener. I can’t complain with the customer service I’ve had so far with Cobb, Aaron has been extremely helpful but I think this is beyond an ECU/Tune issue. I believe it is an actual failed component but I do not have any check engine lights which leads me to either turbo, intercooler, piping or one of the various lines throughout the system either faulty or leaking. A simple boost leak test could show a lot but what I’m stumped by is the fact that it was running low boost on the way to the dealer, then after they replaced the ECU it was acting perfectly normal. Now with the flash it’s spooling faster but not nearly sending the boost it did before any of this happened.
#4
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I have the Cobb tune in my TTS along with the PDK update. Love the tune and found Cobb very responsive to questions and issues. No CELS no issues.
Sorry to hear you are having these issues. If the tune is working properly your car should feel much quicker.
Sorry to hear you are having these issues. If the tune is working properly your car should feel much quicker.
#5
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I'm inclined to believe it's a boost leak. Stock boost level, everything was okay. Then with the increased boost level of the tune, perhaps caused a leak.
#6
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well that’s what I was thinking too.. but why would it act like a boost leak with the stock ECU, then when Porsche replaced the ecu it went back to normal 13 psi boost?
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#8
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so it acted fine on the way home after the ecu was swapped out. I sent the ecu out to cobb to be unlocked again and when I reflashed it, it is not hitting target boost or anywhere close for that matter. More boost from the tune. Correct me if I’m wrong but I believe target boost is around 24 psi with stage 1? Right now I’m barely reaching 15psi
#9
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so it acted fine on the way home after the ecu was swapped out. I sent the ecu out to cobb to be unlocked again and when I reflashed it, it is not hitting target boost or anywhere close for that matter. More boost from the tune. Correct me if I’m wrong but I believe target boost is around 24 psi with stage 1? Right now I’m barely reaching 15psi
You can toggle back to the stock tune and datalog that to comfirm that the datalogger is reading correctly. ( datalogger is reading absolute pressure so substrate 14.7 psi from it to get boost).
#10
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so it acted fine on the way home after the ecu was swapped out. I sent the ecu out to cobb to be unlocked again and when I reflashed it, it is not hitting target boost or anywhere close for that matter. More boost from the tune. Correct me if I’m wrong but I believe target boost is around 24 psi with stage 1? Right now I’m barely reaching 15psi
Can you find a gas station that has 95 or 100 octane? Do straight 100/95 or a mixture with 91 so you can get 93. Flash the 93 map and see what happens.
You don't seem to have any boost leak symptoms other than loss of power.
CEL?
Bad MPG?
Poor Idling?
Smoke?
Any of those?
#11
#13
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no smoke, no rough idle, I was running Mobil 93 with 2 gallons 100 octane. Mpg was low but I thought that was just the tune ~16mpg average.