Low boost / Throttle Closure

[sparky_phantom]

I have been having issues for a few weeks now with low boost issue. I am running Stage 1 Aggressive with Cobb V3 on my 2011 BMW 135i with DCT. The logs that I have done are all over the place but all low numbers in the 10 psi range. I am not sure what the issue is yet and I am trying to figure this out. I have thought of a boost leak, but wouldn't the psi be all over the place or would it just be like my graph? I feel like I am running stock to barely above stock. Before I got the car it already had stage 2 BMW performance kit installed.


First pull in 3rd gear: Traction Control was on with Sport Mode off
http://datazap.me/u/sparkyphantom/3r...=0&data=4-6-16

Second pull in 3rd gear: Traction Control off with Sport Mode off
http://datazap.me/u/sparkyphantom/3r...=0&data=4-6-16

Third pull in 3rd gear: Traction Control off with Sport Mode on
http://datazap.me/u/sparkyphantom/3r...=0&data=4-6-16

[mike@x-ph.com]

Originally Posted by sparky_phantom

I have been having issues for a few weeks now with low boost issue. I am running Stage 1 Aggressive with Cobb V3 on my 2011 BMW 135i with DCT. The logs that I have done are all over the place but all low numbers in the 10 psi range. I am not sure what the issue is yet and I am trying to figure this out. I have thought of a boost leak, but wouldn't the psi be all over the place or would it just be like my graph? I feel like I am running stock to barely above stock. Before I got the car it already had stage 2 BMW performance kit installed.


First pull in 3rd gear: Traction Control was on with Sport Mode off
http://datazap.me/u/sparkyphantom/3r...=0&data=4-6-16

Second pull in 3rd gear: Traction Control off with Sport Mode off
http://datazap.me/u/sparkyphantom/3r...=0&data=4-6-16

Third pull in 3rd gear: Traction Control off with Sport Mode on
http://datazap.me/u/sparkyphantom/3r...=0&data=4-6-16

I can view your 2 last logs

[sparky_phantom]

Originally Posted by mike@x-ph.com

I can view your 2 last logs

Thank you. Also charge pipe is installed and everything. Plan to write a review in the near future, I just was hoping that the charge pipe would fix my boost issue. Not sure what is going on right now.

[mike@x-ph.com]

Originally Posted by sparky_phantom

Thank you. Also charge pipe is installed and everything. Plan to write a review in the near future, I just was hoping that the charge pipe would fix my boost issue. Not sure what is going on right now.

Sorry i miss typed my first reply, i meant i can't view the last 2 logs

[sparky_phantom]

Originally Posted by mike@x-ph.com

Sorry i miss typed my first reply, i meant i can't view the last 2 logs

Are the links working now?

[sparky_phantom]

Does anyone know what the issue maybe? I am trying to narrow it down.

[mike@x-ph.com]

Originally Posted by sparky_phantom

Does anyone know what the issue maybe? I am trying to narrow it down.

1- reset your datalogging parameters
2- boost is going up to 11 psi and tapering down to 9 at redline. Thats about 3 psi over stock. Dont have the Cobb exact boost target for each stage but i think 3 psi is very close to stage 1 .
3- the second run does not have any throttle closure only the thrid, which could be cause by overboost.

[sparky_phantom]

Originally Posted by mike@x-ph.com

1- reset your datalogging parameters
2- boost is going up to 11 psi and tapering down to 9 at redline. Thats about 3 psi over stock. Dont have the Cobb exact boost target for each stage but i think 3 psi is very close to stage 1 .
3- the second run does not have any throttle closure only the thrid, which could be cause by overboost.

From what I can tell with stage 1 aggressive I think it's suppose to be about 14 something and tamper down to 12.4. Correct I am wrong on that. I keep getting mixed information. Some same my stock boost is 10 and others 8.5 so I have no idea. I have ppk2 as well prior to Cobb.

[mike@x-ph.com]

Originally Posted by sparky_phantom

From what I can tell with stage 1 aggressive I think it's suppose to be about 14 something and tamper down to 12.4. Correct I am wrong on that. I keep getting mixed information. Some same my stock boost is 10 and others 8.5 so I have no idea. I have ppk2 as well prior to Cobb.

stock boost is anywhere from 7 to 10 . Whether you have PPK or does not matter as Cobb will completely rewrite the ECU map.
Here is my advice to you.
Reset your datalogging parameters
do a pull with stock and another one with stage 1
Traction control 100% off + sport mode.

[sparky_phantom]

Originally Posted by mike@x-ph.com

Your stock boost is anywhere from 7 to 10 . Whether you have PPK or does not matter as Cobb will completely rewrite the ECU map.
Here is my advice to you.
Reset your datalogging parameters
do a pull with stock and another one with stage 1
Traction control 100% off + sport mode.

That is another issue I can go back to stock, but can not log in stock. I have to uninstall Cobb. What do you mean by reset parameters, how do I do that?

[mike@x-ph.com]

Originally Posted by sparky_phantom

That is another issue I can go back to stock, but can not log in stock. I have to uninstall Cobb. What do you mean by reset parameters, how do I do that?

It is in the setting under datalog. Read the small manual that came with the cobb for instructions on how to reset it
Dont expect much difference in power (if any)since you already have the PPK until you get catlesss downpipes and switch to stage 2

[sparky_phantom]

Originally Posted by mike@x-ph.com

It is in the setting under datalog. Read the small manual that came with the cobb for instructions on how to reset it
Dont expect much difference in power (if any)since you already have the PPK until you get catlesss downpipes and switch to stage 2

Okay thank you for your help. Will give that a go. Downpipes will be next on the list.