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      04-08-2013, 09:39 AM   #1
blaster3500
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Cobb Help

I just switched from my g5 jb4 to cobb last night. On the jb4 the car ran great but everyone raves about cobb so I figured I would try it. I have cpe downpipes and an er charge pipe with hyperboost diverters. Not sure what is happening with the cobb. I am running stage 2 sport v401 I have no timing corrections in my log but the car is very jumpy. It almost feels like clutch slip. I am new to the cobb graphing but my boost seems very inconstant.

http://s4.photobucket.com/user/blast...1fbcd.jpg.html
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      04-08-2013, 10:02 AM   #2
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Can you attach the log(either as a CSV or ZIP)?
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      04-08-2013, 10:04 AM   #3
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      04-08-2013, 10:25 AM   #4
blaster3500
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Hopefully this works. Sorry for the short pulls. The first two are on v301 but I did not realize that only a few options were selected to log. The 3rd log is v401 with more parameters.
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File Type: zip Cobb Logs.zip (37.7 KB, 12 views)
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      04-08-2013, 11:48 AM   #5
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Quote:
Originally Posted by blaster3500 View Post
Hopefully this works. Sorry for the short pulls. The first two are on v301 but I did not realize that only a few options were selected to log. The 3rd log is v401 with more parameters.
Grab a log of a 2nd or(preferably) 3rd geard pull.
also, check this out
http://www.e90post.com/forums/showthread.php?t=696472
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      04-08-2013, 12:19 PM   #6
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Both are short pulls. I honestly don't want to do a pull to redline the way it is. Something is not right ans you can clearly feel the surges in boost its not missing but more like clutch slip off and on
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      04-08-2013, 12:37 PM   #7
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Quote:
Originally Posted by blaster3500 View Post
Both are short pulls. I honestly don't want to do a pull to redline the way it is. Something is not right ans you can clearly feel the surges in boost its not missing but more like clutch slip off and on
You've definitely got some serious overboosting going on there. Honestly, it's some of the worst throttle closures i've seen. What ROM version do you have?
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      04-08-2013, 01:16 PM   #8
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I8AOS I updated the cobb to the newest firmware before the install. The car ran perfect with the jb4 and stock. I am going to email cobb and see if they have any input. It is a little disappointing but hopefully I will get it figured out.
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      04-08-2013, 01:41 PM   #9
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Quote:
Originally Posted by blaster3500 View Post
I8AOS I updated the cobb to the newest firmware before the install. The car ran perfect with the jb4 and stock. I am going to email cobb and see if they have any input. It is a little disappointing but hopefully I will get it figured out.
If you want, you can give this map a try. I pulled quite a bit of duty cycle out of the base table to see if it helps with the overboosting. If you want to try it, just open your version of ATR and open the map. Then just save it and it will assign it with your serial # so you can load it on the AP.
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File Type: zip blaster3500.zip (7.1 KB, 13 views)
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      04-08-2013, 02:08 PM   #10
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I appreciate you doing that. Is the map pretty safe to run? I am going to load stage 1 drive and see where that gets me. I'll post up some more logs tonight and download ATR. Thanks again
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      04-08-2013, 02:14 PM   #11
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Quote:
Originally Posted by blaster3500 View Post
I appreciate you doing that. Is the map pretty safe to run? I am going to load stage 1 drive and see where that gets me. I'll post up some more logs tonight and download ATR. Thanks again
It's the exact same as stage 2 sport linear throttle, I just made a couple small changes to see if it helps with the over boosting. It's perfectly safe to run.

Be sure you have DSC completely disabled when logging.
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      04-08-2013, 03:06 PM   #12
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Ok I'll load it up before I head home from work. I'll post some logs tonight. Thanks again
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      04-08-2013, 04:35 PM   #13
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I had to go make a deposit so I did a quick 2nd gear pull on stage 1 drive v401. Same thing. Here is a log. Ill post a log in a couple of hours with your new map
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File Type: zip stage1LTdrive401.zip (5.5 KB, 12 views)
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      04-08-2013, 04:45 PM   #14
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Still getting a lot of overboosting.
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      04-08-2013, 04:47 PM   #15
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Oh yeah. I can feel it in just that 2nd gear pull. What would cause this? I didnt realize I had to wait to download ATR so it maybe tomorrow before I can try the map
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      04-08-2013, 04:53 PM   #16
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The DME follows waste gate tables that have been designed to hit a certain boost level without having to rely heavily on the PID tables. When there is too much WGDC it will cause overboosting and the DME will react by closing the throttle plate. This will cause driveability issues.
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      04-08-2013, 04:56 PM   #17
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Could this be caused by out of adjustment wastegates? I took it to the dealer a couple months ago and I know there are not supposed to adjust them but they said they made a few changes when I complained about wastegate rattle. Sorry I am new to this platform and am trying to take in as much as possible
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      04-08-2013, 05:05 PM   #18
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That sounds like a definite possibility. It sounds like you've got "tight" wastegates.
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      04-08-2013, 05:09 PM   #19
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I will check them tonight. I should have adjusted them when I installed my downpipes. I still have some rattle and had no problems on the JB4 so I am not so sure. Once again thanks for the help.
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      04-08-2013, 05:45 PM   #20
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The new map seemed to do the trip. Maybe I should just go ahead and get a protune. I just want to make sure I like it over the jb4. I got a little timing pull I guess I will try a different gas station for my next fillup. Here is the log. Thanks a ton!
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File Type: zip datalog7.zip (4.0 KB, 9 views)
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      04-08-2013, 06:08 PM   #21
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Yeah, that's a step in the right direction. There is still some over boosting but not enough for the DME to step in.

A PROtune is a good idea, especially in your unfortunate case where the dealer half-assed a fix instead of replacing the turbos like they should have.
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      04-08-2013, 06:13 PM   #22
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Quote:
Originally Posted by blaster3500 View Post
The new map seemed to do the trip. Maybe I should just go ahead and get a protune. I just want to make sure I like it over the jb4. I got a little timing pull I guess I will try a different gas station for my next fillup. Here is the log. Thanks a ton!
Quote:
Originally Posted by Ænema View Post
Yeah, that's a step in the right direction. There is still some over boosting but not enough for the DME to step in.

A PROtune is a good idea, especially in your unfortunate case where the dealer half-assed a fix instead of replacing the turbos like they should have.
Protune becomes even better if you happen to have E85 around where you live
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