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Old 10-06-2011, 10:09 PM   #1
invaderzim
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Default Stage1+SF 93 not reaching ~17psi

I have a 2011 wrx with SPT cat-back exhaust and the cobb intake. I was watching the boost through the AP and noticed that the highest boost I'm obtaining is 15.5-15.9psi.

It seems like the car was boosting a bit higher before I had the intake installed (over 16psi) but it still feels fast. Just wondering if I should try a high wastegate or low wastegate map and if not what should I do to get more boost?
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Old 10-06-2011, 10:24 PM   #2
424wrx
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try the normal wastegate map.the other map is primarily for west coast owners with lower octane fuel available. what octane are your running? ive always used 93 in mine. i see 22 psi with a stage 3 custom tune.
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Old 10-06-2011, 10:58 PM   #3
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Your going to want to try the High Wastegate map.
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Old 10-07-2011, 09:01 AM   #4
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Quote:
Originally Posted by invaderzim View Post
I have a 2011 wrx with SPT cat-back exhaust and the cobb intake. I was watching the boost through the AP and noticed that the highest boost I'm obtaining is 15.5-15.9psi.

It seems like the car was boosting a bit higher before I had the intake installed (over 16psi) but it still feels fast. Just wondering if I should try a high wastegate or low wastegate map and if not what should I do to get more boost?
Keep in mind that your actual boost target can vary by gear, throttle position, RPM, RPM you start your run in, altitude, outside temperature, etc. For example, you will not hit your boost target in 1st and 2nd gear (this is normal). You will also not hit your target in high gears if you do not allow time for boost to build (boost is not instantaneous).

If you can do so safely, try to get a data log of a 3rd gear wide open throttle run from about 2000 RPM on up (up to near redline if you can do so safely). This will give us a good picture of what boost control is doing.

Here is a general video on how to data log with the AP v2:

Just use the default logging set (do not remove or add any parameters).

Bill
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Old 10-07-2011, 12:47 PM   #5
invaderzim
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Thanks for the response! I will try to data log 3rd gear later today and get back to you.
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Old 10-08-2011, 02:37 AM   #6
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here we go. did a 3rd gear pull from ~2500rpm to ~7000rpm. it never went past 16psi.

https://docs.google.com/spreadsheet/...=0&output=html


also this was on a mostly flat road with temperatures at about 50F and one passenger.

Last edited by invaderzim; 10-08-2011 at 02:47 AM.
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Old 10-08-2011, 11:44 AM   #7
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Originally Posted by invaderzim View Post
here we go. did a 3rd gear pull from ~2500rpm to ~7000rpm. it never went past 16psi.

https://docs.google.com/spreadsheet/...=0&output=html


also this was on a mostly flat road with temperatures at about 50F and one passenger.
Log looks good other than the low boost (no knock). I would go ahead and give the high wastegate (HWG) version of the map a try.

Bill
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Old 10-24-2011, 08:01 PM   #8
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Quote:
Originally Posted by 424wrx View Post
try the normal wastegate map.the other map is primarily for west coast owners with lower octane fuel available. what octane are your running? ive always used 93 in mine. i see 22 psi with a stage 3 custom tune.
That is not correct information.
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Old 11-03-2011, 09:24 AM   #9
subiebosch
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I just did the same thing on my 2011 wrx hatch.

SPT exahust
COBB SF + Stage 1 93

I was running just the map for 2000 miles before i put the SF w/air box on. Now the car definitely feels slower. Its hitting boost around 17psi, but its taking longer to get there, and its not as "violent" as before. Based on how it acted before I can tell a difference, and I'm not sure why. Seems a lot more "laggy" with the CAI and the new map then just with the MAP before.
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Old 11-03-2011, 11:17 AM   #10
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Originally Posted by subiebosch View Post
I just did the same thing on my 2011 wrx hatch.

SPT exahust
COBB SF + Stage 1 93

I was running just the map for 2000 miles before i put the SF w/air box on. Now the car definitely feels slower. Its hitting boost around 17psi, but its taking longer to get there, and its not as "violent" as before. Based on how it acted before I can tell a difference, and I'm not sure why. Seems a lot more "laggy" with the CAI and the new map then just with the MAP before.
Best thing to do is to get a data log and we can see how things look:

If it hasn't been very long since you reflashed the map for the SF intake, then give the ECU some time to learn. Reflashing a map clears all learned ECU functions.

Bill
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Old 11-03-2011, 11:26 AM   #11
subiebosch
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Sir,

Thanks for the reply. I drove less then 100 miles on the new map and that's mainly highway driving. I'm not too concerned since I do hit boost at 17psi. But I will drive it some more, and take a log of a pull as well.

Andrei
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Old 11-03-2011, 10:31 PM   #12
subiebosch
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Bill,

here is the log that i took....weather was 52F.

https://docs.google.com/spreadsheet/...hl=en_US#gid=0

2011 WRX, SPT cat back, COBB intake with airbox. car has about 7.5k miles on it.

Been running the COBB stage 1 + SF 93 MTv300 map for about 110 miles now. but for the last 2k miles i was just running the stage 1 93 map....which to me seemed a lot more peppy....but it could be just me.

Let me know what you think. Much appreciated Sir.

Andrei
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Old 11-04-2011, 10:42 AM   #13
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Originally Posted by subiebosch View Post
Bill,

here is the log that i took....weather was 52F.

https://docs.google.com/spreadsheet/...hl=en_US#gid=0

2011 WRX, SPT cat back, COBB intake with airbox. car has about 7.5k miles on it.

Been running the COBB stage 1 + SF 93 MTv300 map for about 110 miles now. but for the last 2k miles i was just running the stage 1 93 map....which to me seemed a lot more peppy....but it could be just me.

Let me know what you think. Much appreciated Sir.

Andrei
Log looks good. You are underboosting a tad, but it is borderline. You could try our high wastegate map (HWG) and see if that gets you closer. Although that could cause you to overboost in higher gears when you go WOT. Hard to tell though without trying it. Won't hurt to try, but make sure you get the same type log and post it up here. The HWG map can be found in our map repository:
http://www.cobbtuning.com/info/?ID=3061

You then would transfer it to your AP via the AP Manager software and then reflash the HWG map to your car.

Bill
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Old 11-04-2011, 10:49 AM   #14
subiebosch
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Thanks for checking Sir,

I think I'll stick with this map for now, i really don't want to get into overboosting and i'm pretty close to my target boost. i'll try the other map soon and see how high my boost will get up to compared with this map. I already have all the maps uploaded to my accessport.

Thanks again for checking Bill,

Andrei
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Old 11-04-2011, 08:34 PM   #15
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I just put mine on and flashed the acn91 + sf map. Didn't buy the box yet just the intake. This thing sounds crazy, louder than I thought it would be even though I had read the various comments. I love it. I am getting 16.8psi.
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Old 11-04-2011, 08:46 PM   #16
subiebosch
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16.8 psi is not bad considering you're running 91 map. i was getting 16.5 (around there) during my 3rd gear pull.

and yes, the intake is awesome...it looks better with the airbox, and it keeps the heat from the engine away better, i would invest in the box, just my 2 cents.
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Old 11-05-2011, 01:12 AM   #17
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Yeah I plan on getting the box in december. Yeah I didn't hit redline in that run cause I ran outta room. Did hit about 6k though.
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Old 11-08-2011, 01:41 AM   #18
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Nevermind now since I came back from a 200 mile trip and filled up with Shell 91 instead of Costco 91 I am not hitting 16.8 anymore. Can someone please help me with my datalog it appears that I am not hitting target boost and it shows some fine knock learning. Sorry to threadjack but this might help solve your problem too.

https://docs.google.com/spreadsheet/...wdGJLS2c#gid=0
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Old 11-08-2011, 09:08 AM   #19
subiebosch
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Try the high wastegate setting map and do another pull, that's what the advice from COBB was for me when I uderboosted.
I have always wondered if getting fuel form other places can have an effect on the engine. Maybe its just a bad batch of fuel....that might explain the knock learning as well.
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Old 11-08-2011, 11:28 AM   #20
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Quote:
Originally Posted by PearlRex11 View Post
Nevermind now since I came back from a 200 mile trip and filled up with Shell 91 instead of Costco 91 I am not hitting 16.8 anymore. Can someone please help me with my datalog it appears that I am not hitting target boost and it shows some fine knock learning. Sorry to threadjack but this might help solve your problem too.

https://docs.google.com/spreadsheet/...wdGJLS2c#gid=0
Hi. I responded to your question over at the cobb forums.

Bill
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Old 11-08-2011, 12:21 PM   #21
PearlRex11
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Your great man. I appreciate your help very much.
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Old 11-08-2011, 01:21 PM   #22
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I will post my datalog from the hwg map later today. Don't think its what I need because I had the target boost showing during logging and it hit 21.2. Yikes!
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Old 11-08-2011, 01:25 PM   #23
subiebosch
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yeah thats why i went back to just regular map. mine hit 19.2 and that was too much for me. it was worth a try tho.
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Old 11-08-2011, 07:50 PM   #24
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Hm I'm having a similar problem. I have Cobb stage 1 + AEM intake. I'm only seeing 14.5 psi in 3rd gear though. I finally saw 15.8 in 4th. I wonder if I should try the HWG map.. although you guys both saw overboosting
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Old 11-08-2011, 08:54 PM   #25
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Now I am not so sure that it was overboosting. I saw 21.2 on the target boost while I was datalogging but then when I get home and look at the datalog it isnt going over 16 or so??? I waiting to here back from Bill on the Cobb forum. I will post here what I find out.
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