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Old 10-09-2012, 01:20 PM   #1
cheesy44
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Default Stage 2 Sf intake and catless DP log

I have a 2011 Wrx with the cobb intake and a catless downpipe running the cobb stage 2 tune. Here is my log could you please take a look at it for me.

https://docs.google.com/a/worcester....U5rZFBMUG5aeVE

Thank you!
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Old 10-09-2012, 02:34 PM   #2
subiebosch
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2002 impreza, 11 rex
2011 WRX TP STG2 COBB DP

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Make the log public please.
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Old 10-09-2012, 05:59 PM   #3
cheesy44
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Oh sorry forgot to make to make it public! Thanks for letting me know!
It is public now!
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Old 10-09-2012, 09:00 PM   #4
ScoobyTed
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Cobb will certainly chime in, but I would say you look good.

A/F learning value looks good, the little bit of knock is when you got into the throttle and hit boost ( from my understanding, and it looks minimal) . DAM is 1. I think you are all set. I am by NO means an expert, but I think they look good. If anyone else has some input, please correct me!
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Old 10-10-2012, 08:51 AM   #5
Cobb Tuning
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Quote:
Originally Posted by cheesy44 View Post
I have a 2011 Wrx with the cobb intake and a catless downpipe running the cobb stage 2 tune. Here is my log could you please take a look at it for me.

https://docs.google.com/a/worcester....U5rZFBMUG5aeVE

Thank you!
Log looks generally good. The fine knock learning (two events) appear to have been learned previously, so hard to say if that is noise or not.

On the bad side, boost is not tapering as fast as it should. That could be indication of "boost creep" due to the catless exhaust. What was the outside temperature when you did this run? I would be concerned that it will get worse when it gets colder out.

Bill
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Old 10-10-2012, 09:10 AM   #6
cheesy44
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I would say it was about 55 out when I did this log. Once the weather cools off I will take another log. Is there any way to eliminate the boost creep?
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Old 10-10-2012, 09:14 AM   #7
rockyraccoon
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Quote:
Originally Posted by cheesy44
I would say it was about 55 out when I did this log. Once the weather cools off I will take another log. Is there any way to eliminate the boost creep?
You can usually tune it out with a pro tune, but more than likely the factors to blame are either one of these or a combination of these: cold weather, intake, and catless dp. I'm thinking cold weather plus intake, but I could be wrong.
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Old 10-10-2012, 09:43 AM   #8
Cobb Tuning
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Quote:
Originally Posted by cheesy44 View Post
I would say it was about 55 out when I did this log. Once the weather cools off I will take another log. Is there any way to eliminate the boost creep?
Catless downpipe is likely the biggest culprit here, if this is, in fact, boost creep. If it is actual boost creep, you will not be able to tune around it and it will likely get worse with colder weather. In that case, you would need a mechanical solution which would be 1. increase exhaust backpressure (go with catted DP), 2. external wastegate + tune 3. port wastegate area turbo + tune.

There is an easy way to determine if you can tune around this or not. Download the stage 2+SF economy mode map from the maps section at cobbtuning.com for your car. Use the AccessPORT Manager to transfer the map from your computer to your AccessPORT and then reflash the map. Do another run (if you can do so safely) getting closer to redline this time. If there is still an issue with overboost at high RPM with the economy map (where boost control is disabled) then it means that you cannot tune around this issue. Right now, you are not too bad based on that last log, but you did not take it all the way to near redline and it may get worse at colder temps, so definitely something to look at (and always a potential concern with a catless downpipe).

Bill
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Old 10-10-2012, 08:06 PM   #9
cheesy44
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Okay thank you very much I will soon change the tune and take another data log. I am thinking about doing an external wastegate as well.

Thank you
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