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Old 10-20-2011, 12:22 PM   #1
Danger Doug
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Question Overboosting in 5th Gear

2011 WRX stage 1.

I tried to find a general questions thread, but no dice.

The car runs great and usually peaks out at around 16.8-16.9psi in third gear any given day, with the occasional 15.5+ on an off day. I figure this is fine since it's not exceeding the advertised 16.5+-.5psi. What concerned me the other day was having the AP plugged in and showing boost, I got up to 17.9 psi. Scared to death I was cooking the turbo, I slowed down. I thought it was just a fluke, until it happened again a few days later. Needless to say I'm watching the pedal in 5th now. I've noticed that it only occurs when I'm WOT in 4th until 5200rpm, and then shift to 5th, and go WOT again.

I understand that this may be useless info without a datalog, but I'm apprehensive to do that kind of speed without the ability to safely do so. If it's absolutely critical I'll see what I can do.


Thanks for any help!
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Old 10-20-2011, 08:21 PM   #2
424wrx
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did you throw a po244 overboost code? if not i wouldnt worry about it. your car will let you know if you hit the boost threshold. my tune is for about 20 psi and i see 22 psi somedays.
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Old 10-21-2011, 09:57 AM   #3
Cobb Tuning
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Quote:
Originally Posted by Danger Doug View Post
2011 WRX stage 1.

I tried to find a general questions thread, but no dice.

The car runs great and usually peaks out at around 16.8-16.9psi in third gear any given day, with the occasional 15.5+ on an off day. I figure this is fine since it's not exceeding the advertised 16.5+-.5psi. What concerned me the other day was having the AP plugged in and showing boost, I got up to 17.9 psi. Scared to death I was cooking the turbo, I slowed down. I thought it was just a fluke, until it happened again a few days later. Needless to say I'm watching the pedal in 5th now. I've noticed that it only occurs when I'm WOT in 4th until 5200rpm, and then shift to 5th, and go WOT again.

I understand that this may be useless info without a datalog, but I'm apprehensive to do that kind of speed without the ability to safely do so. If it's absolutely critical I'll see what I can do.


Thanks for any help!
If you are about +/- 1 psi of the map target, this is generally just fine. You will sometimes see higher boost levels in higher gears. The engine control unit has a protection feature where it cuts fuel if you boost much too high (above a limit that would generally be a problem as determined by a map). Regardless, try to get a data log as described by the following video (if you can do safely). We can check to see what your boost control looks like and if you need to switch to the low wastegate map or not.

Bill
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Old 10-21-2011, 01:46 PM   #4
Danger Doug
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sounds good - I'm away with a different vehicle so it'll be a couple of days. Thanks!
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Old 10-25-2011, 12:15 AM   #5
russianrednek
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my 06 is overboostig in 4th and 5th hitting 15.8 psi.
the car is stock cobb stage 1 AP nothing else is modified.
any thing i should be consern of ? please help.
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Old 10-25-2011, 10:19 AM   #6
Cobb Tuning
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Quote:
Originally Posted by russianrednek View Post
my 06 is overboostig in 4th and 5th hitting 15.8 psi.
the car is stock cobb stage 1 AP nothing else is modified.
any thing i should be consern of ? please help.
If you have an AP v2, the best thing to is to get a 3rd gear data log (see the video posted earlier in this thread). Keep in mind you will generally see higher boost in higher gears.

Bill
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Old 10-28-2011, 02:52 PM   #7
mohawk24
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i have a bone stock 02 n the other day while in wot in 5th gear i see my gauge sweeping back n forth between about 13-17 psi now when im in wot in 5th it will go up to about 15+ psi then drop to 10 psi then build back up to around 14 and hold there like supposed to any ideas what is going on i dont see any vac lines loose thanks
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Old 10-28-2011, 03:48 PM   #8
Cobb Tuning
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Quote:
Originally Posted by mohawk24 View Post
i have a bone stock 02 n the other day while in wot in 5th gear i see my gauge sweeping back n forth between about 13-17 psi now when im in wot in 5th it will go up to about 15+ psi then drop to 10 psi then build back up to around 14 and hold there like supposed to any ideas what is going on i dont see any vac lines loose thanks
Can you list all your mods? What map are you running? Do you have a version 1 or version 2 AccessPORT?

Bill
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Old 10-28-2011, 07:17 PM   #9
Danger Doug
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Sorry for the long delay: here's a link for my 3rd gear 2000-Red:
3rd Gear Run

I have a log of of the overboosting in 5th, but it's only to 17.4psi. It's at line 186 on this link.
5th Gear Run


If there's any issues with viewing, let me know. I'll fix asap. Thanks again!
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Old 10-29-2011, 09:43 AM   #10
Cobb Tuning
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Quote:
Originally Posted by Danger Doug View Post
Sorry for the long delay: here's a link for my 3rd gear 2000-Red:
3rd Gear Run

I have a log of of the overboosting in 5th, but it's only to 17.4psi. It's at line 186 on this link.
5th Gear Run


If there's any issues with viewing, let me know. I'll fix asap. Thanks again!
I don't see any issues here. You will hit higher boost levels at WOT in higher gears, but as long as you are within 1 psi or so of the target, this is not a problem.

Bill
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Old 10-30-2011, 03:15 PM   #11
mohawk24
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Bill, my car is completely stock no ap no mods
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Old 10-30-2011, 03:18 PM   #12
FNR32
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It's worth mentioning that it isn't uncommon to see somewhat of a spike as the temperature gets colder.
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Old 10-30-2011, 09:01 PM   #13
Danger Doug
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Thanks for the check-up, Bill!

Quote:
Originally Posted by FNR32 View Post
It's worth mentioning that it isn't uncommon to see somewhat of a spike as the temperature gets colder.
That would explain a lot, actually. Good to know.
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Old 10-31-2011, 10:24 AM   #14
Cobb Tuning
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Quote:
Originally Posted by mohawk24 View Post
Bill, my car is completely stock no ap no mods
What is the history of the car? Has it had a manual boost controller in its past?

Bill
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Old 10-31-2011, 12:18 PM   #15
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Quote:
Originally Posted by Cobb Tuning View Post
What is the history of the car? Has it had a manual boost controller in its past?

Bill

i have only owned the car a little over 6 months so i dont know but i every part seams to b stock i just put in a new clutch i took off the ic to see if i was leaking n reinstalled everything seams to b tight i now when it did this it was less then a week after the clutch install could this just been a ecu learn to fix it has stabled some but still sweeps some in 5th n only 5th but not as bad but my boost gause is still reading 14-14.5 psi without any tuning sw installed i did just order a ap i should get today so im a lil concerned that when i install ap my boost will be 2 high n running way to lean thanks so far for your help
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Old 10-31-2011, 12:35 PM   #16
Cobb Tuning
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Quote:
Originally Posted by mohawk24 View Post
i have only owned the car a little over 6 months so i dont know but i every part seams to b stock i just put in a new clutch i took off the ic to see if i was leaking n reinstalled everything seams to b tight i now when it did this it was less then a week after the clutch install could this just been a ecu learn to fix it has stabled some but still sweeps some in 5th n only 5th but not as bad but my boost gause is still reading 14-14.5 psi without any tuning sw installed i did just order a ap i should get today so im a lil concerned that when i install ap my boost will be 2 high n running way to lean thanks so far for your help
The following assumes you are using an AP v2 (not v1):

I would go ahead and download a low wastegate stage 1 map from our site here:
http://www.cobbtuning.com/info/?ID=3061

The low wastegate map (LWG) will be the most conservative map when it comes to boost control. However, this map is not on the AP when you buy it. So, you'll need to download it from above and transfer it to your AP with the AP Manager software:
http://www.cobbtuning.com/support

Do this before you install and then select the LWG for the install. Then you'll want to get a data log. See our AskCobb data loggging video below. It will tell you to do a 3rd gear wide open throttle run (if you can do so safely). In addition to that, try to get a log of the boost oscillation in 5th. Don't make a super long log - just make it long enough to show the problem. When you have your logs, you can upload them to goggle docs and then post a link here to them (make sure you set the permissions to public so that anyone can view them).


Bill
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Old 05-13-2012, 01:13 AM   #17
Onejamasubaru
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Funny, I just did some data logging and went WOT in 5th and hit 17.5 psi and I got scared. I have never heard the turbo spool like that. Kinda scares me to think that the TP stage 1 tune is made for 18psi lol...
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Old 05-13-2012, 10:06 AM   #18
bacalhau16
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Yes, as you modify and the boost increases, the car does take on a slightly different tone. It happens. Don't be scared, embrace it. lol
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Old 05-13-2012, 10:23 AM   #19
oOIIJoshIIOo
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My friend had a 09 STi with stage 2 that through an overboost code in 5th. Unhooked the battery for a while then reflashed it and didn't happen again.
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