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Old 04-05-2014, 07:15 PM   #1
stikboy
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Default Big problems with Cobb Stage 2 logs

Hey Guys,

I just got done doing some data logging on my car and I saw a bunch of issues in the feedback knock and fine knock learning. Last time I data logged in October, I didn't have any issues, but now something is definitely messed up. Can any of you advise what the problem might be or what I should do? I especially would love to hear from Cobb on this one.

Here are the specs for the data logging
52F
800 ft above sea level
Stock intake, Cobb downpipe, SPT exhaust.
Running a Cobb Stage 2 93 OTS for about 40-50 miles since last reflash.
All runs were in 3rd gear.

https://drive.google.com/file/d/0B7_...it?usp=sharing
https://drive.google.com/file/d/0B7_...it?usp=sharing
https://drive.google.com/file/d/0B7_...it?usp=sharing

Thanks in advance Guys!
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Last edited by stikboy; 04-05-2014 at 07:30 PM.
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Old 04-06-2014, 01:49 AM   #2
snoopy_sti
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What map version are you using? Try the new Beta versions.
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Old 04-06-2014, 12:45 PM   #3
stikboy
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Quote:
Originally Posted by snoopy8818 View Post
What map version are you using? Try the new Beta versions.
I am running Stage 2 93 v300, but was wondering if going down the 91 would fix the issue? Last year I never had a knock issue so I am wondering if I have bad gas in the tank... Anyway, looking at the beta maps, they seem to address the boost creep problem that I didn't have, but I also see that they address some knock concerns. I am away from my car for the next week so unless Cobb has any additional ideas, I will try the beta maps when I get back.
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Old 04-06-2014, 01:03 PM   #4
mikeydrives1
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Its possible that its bad gas. Its knock that occurs once your already in boost for 2 of the logs, and as your building boost in that 3rd log , and yes you have a little bit of a spike to 17, it corrects to 16, then moves back to 17psi. The timing is down near 11 or 12 degrees, which isnt overly aggressive IMO, but theres a chance that maybe the fuel mixture is leaning out, or its bad fuel. Try switching to the 91 octane map and see if that alleviates this.

You should invest in a wideband sensor though, its a very handy and useful monitor in the car.
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Old 04-06-2014, 01:17 PM   #5
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You mike also check for loose bolts/nuts/heat shields. They can trigger the knock sensor as well. Any chance that you recently installed anything on your car?
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Old 04-06-2014, 01:22 PM   #6
stikboy
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Quote:
Originally Posted by mikeydrives1 View Post
Its possible that its bad gas. Its knock that occurs once your already in boost for 2 of the logs, and as your building boost in that 3rd log , and yes you have a little bit of a spike to 17, it corrects to 16, then moves back to 17psi. The timing is down near 11 or 12 degrees, which isnt overly aggressive IMO, but theres a chance that maybe the fuel mixture is leaning out, or its bad fuel. Try switching to the 91 octane map and see if that alleviates this.

You should invest in a wideband sensor though, its a very handy and useful monitor in the car.
Thanks for the info. Next time I am with my car, I will try the 91 v300 OTS and also the 93/91 v331 to see which one works best. If it ends up being bad gas, I will have to drive like my grandma for a little while to get it out of there.

Quick dumb question, is the wideband sensor something that stays on the car or comes and goes with me like the AP? Sorry, I'm too smart with some of these things yet.
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Old 04-06-2014, 01:25 PM   #7
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Quote:
Originally Posted by nmlittlebigman View Post
You mike also check for loose bolts/nuts/heat shields. They can trigger the knock sensor as well. Any chance that you recently installed anything on your car?
Actually, I haven't had anything installed recently, but I did install the Cobb DP in October. I logged after that and all was well, but things can shake loose. What nuts/bolts/heat shields should I look at? Turbo heat shield and all attaching bolts in the area? Also, how do these items cause the knock sensor to whack out? I never heard of this before.
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Old 04-06-2014, 02:09 PM   #8
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Try the new map see what that does. It probably is bad gas or something loose but I think the new maps would better prevent you from leaning out.

http://forums.nasioc.com/forums/show....php?t=2603401
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Old 04-06-2014, 02:32 PM   #9
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Quote:
Originally Posted by snoopy8818 View Post
Try the new map see what that does. It probably is bad gas or something loose but I think the new maps would better prevent you from leaning out.

http://forums.nasioc.com/forums/show....php?t=2603401
Thanks.
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Old 04-06-2014, 05:24 PM   #10
stikboy
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Okay, so this whole issue was annoying me so badly that I decided to head home for a few hours to try out the beta maps. Here are what they looked like:

1st runs
2011 WRX
37,000 miles
Mods - Cobb AP, Cobb DP, SPT exhaust, GS lightweight pulley
800 ft above sea level, level ground, 60 F
Stage 2 93 v331

https://drive.google.com/file/d/0B7_...it?usp=sharing
https://drive.google.com/file/d/0B7_...it?usp=sharing

Everything looked great in these except that I was under boosting by 2-2.5 PSI so I switched to the HWG maps.

2nd runs
2011 WRX
37,000 miles
Mods - Cobb AP, Cobb DP, SPT exhaust, GS lightweight pulley
800 ft above sea level, level ground, 60 F
Stage 2 93 v331 HWG

https://drive.google.com/file/d/0B7_...it?usp=sharing
https://drive.google.com/file/d/0B7_...it?usp=sharing

Still under boosting by 1.5 PSI, but I am not having any knock issues. When I get some time, I might go back to Stage 2 91 v300 as I do not remember having any issues with that map and it gives me 17.5 PSI of boost. As long as it is done safely, I would be willing to take the additional PSI.

If anyone has additional thoughts, please let me know. I appreciate all of your input thus far.

Thanks!

Last edited by stikboy; 04-06-2014 at 11:06 PM.
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Old 04-06-2014, 06:33 PM   #11
Lost_In_Oz
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The link to new logs is not working...
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Old 04-06-2014, 11:06 PM   #12
stikboy
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Just fixed it. Sorry...
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Old 04-07-2014, 01:01 AM   #13
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If these maps are like the Beta STI ones it does not let the learned AF D range apply during WOT pulls so your fueling is not effected by what was learned in closed loop. Thats one of the advantages. Cobb stopped that a few revisions ago with the STI maps. I have gotten much better response with the updated STI ones.
You might want to copy over the WGDC from the old map to the new one in ATR and see if you get closer to target boost that way.
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Old 04-07-2014, 01:22 AM   #14
stikboy
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I might do that, but I was also debating on getting a protune sooner than later. I have gotten some good advice today so it will be interesting to see what Cobb's team has to say about this in the next day or so. Either way, I am better off than where I was last night.
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Old 04-08-2014, 04:19 PM   #15
stikboy
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Bump for a comment from Cobb?
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Old 04-09-2014, 10:26 PM   #16
stikboy
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Bueller? Bueller?? Bueller??

*sigh*

If I wasn't on a mobile app I would "sad banana"...
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Old 04-10-2014, 02:04 PM   #17
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The latest logs look great other than the slight under boost. I would check the car out for any potential boost leaks just to make sure everything is sealed up properly. If you can, look into getting a pressure/smoke test as that will quickly point out any issues. Potential areas for concern on the 09+ WRXs would be the TMIC to throttle body connection, BPV, and plastic end tanks on the TMIC.

Once you are confident everything is sealed up, we have a few options on raising your boost levels. Using Accesstuner Race (free download here) you could copy and paste the wastegate duty cycles (WGDC) from the older v300 maps into a new v331 map to create your own custom version. I would recommend leaving the high RPM WGDCs from the v331 maps though as we found the car responded well to the reduction in exhaust back pressure. The other option would be to use the current v331 map and bump up the WGDCs in the areas where your TD Boost Error is greater than 1.0.

I'd be happy to help you with either of the above options if you need assistance.

- Chris
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Old 04-10-2014, 08:18 PM   #18
stikboy
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Thanks for the reply Chris. I will check everything out for leaks, but I was hitting full boost with the Stage 2 93 map so I am fairly certain that I am all buttoned up. Unfortunately, I was knocking like mad so I tried the Beta maps. If I check out okay, I may try changing the tables as you suggest.

Thanks again.
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