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Old 03-14-2010, 09:09 AM   #1
Robstunner
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Default 2010 wrx w/ Cobb stage 2 OTS overboosting

Perrin Catted downpipe
Perrin Cat back
STOCK intake Filter
Forge BPV running a yellow spring (15-23PSI)

I did some datalog, and although they are not till redline, i still logged them and noticed that i am fairly above the boost target i should be. The man log i did i knocked out 18.7 PSI top, tapering down. but the mini log i did, where i just floored it WOT from a cruise, i hit 19.43 max.

Can anyone else help me out and look at my maps? is there any other issues other than the overboost? i DO hear a light pitched howl at WOT and max boost so that's another oddity.

Datalog 1 is the normal 3krpm and up
Datalog 3 is the overboost i caught

(I'm sorry but I'm posting this at work on my phone so I can't upload the maps onto here, so I'll have the link to the cobbforums thread till I gr home tomorrow night.)

http://www.cobbforums.com/forums/sho...2-overboosting

------------------------------

also, took the advise from Cobb and installed the LWG version of the stage 2 map. Here's what I've found:

Well I installed the LWG map and all was good untill this morning. I hit 18.3 psi and if i recall correctly it should be at 16.8 with an acceptance of +/- 0.8. I did a datalog but it was on my way to work (where I am now) and I won't be able to upload it here until tomorrow. Temps were 44 degree outside. I asked Perrin if the downpipe might be restricing the wastegate at all and they said that should not be an issue. I do hear a wierd noise at times under full boost that sounds like a howl, might be normal for a downpipe tho I'm no sure.


Any help or suggestions would be greatly appreciated.

Thanks in advanced!
Rob
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Old 03-14-2010, 09:57 AM   #2
arghx7
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Pressure test for any vacuum/boost/air leaks first.
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Old 03-14-2010, 10:00 AM   #3
Robstunner
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Never thought of that. How would I do it?

I just re rightened my bolts For the ic and bpv. Hopefully that's all it would be but im doubting that's it. Wastegate feels like it opens just fine as well.

Last edited by Robstunner; 03-14-2010 at 11:14 AM.
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Old 03-14-2010, 11:13 AM   #4
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put the stock bpv back on. did you try that?
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Old 03-14-2010, 11:59 AM   #5
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could try that tomorrow, I really hope that's not the case tho. The bpv is 100% recirc and holds the proper spring
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Old 03-15-2010, 07:00 PM   #6
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Swap on your stock BPV, then datalog again...
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Old 03-15-2010, 07:10 PM   #7
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Quote:
Originally Posted by Sinitron View Post
Swap on your stock BPV, then datalog again...
actually, when reading the map notes, i read the wrong one. i SHOULD be at 17.8psi with the LWG map, so that means 18.3 would be within the threshold of +/- 0.7psi. Sorry, and thanks!
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Old 03-15-2010, 10:22 PM   #8
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I have basicly the same set up, but do not have the BPV, just the stock.
I am actuly getting the same results you are in my 08. I changed to the LWG map and of course it does not pull as hard; does seem to help with the overboosting.
Hope this helps, to let you know your not the only one.....
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Old 03-15-2010, 10:56 PM   #9
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yea, its too bad, but at least i know im within the threshold now. im ok with being more safe than sorry, im really just using this OTS cobb map to hold me over until the perrin maps are released for my year.
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Old 03-16-2010, 02:46 PM   #10
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Quote:
Originally Posted by Robstunner View Post
yea, its too bad, but at least i know im within the threshold now. im ok with being more safe than sorry, im really just using this OTS cobb map to hold me over until the perrin maps are released for my year.

so if installed my catted dp pipe on my 2010 wrx do i have to download the stage 2 93 LWG instead of the other one i live in chicago too. Also rob did you wrap your perrin cat only itself with exhaust wrap because looks like there is no heat shield around there and its close to the axle boot. any advice would be great. thanks
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Old 03-16-2010, 06:40 PM   #11
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Quote:
Originally Posted by zobispo View Post
so if installed my catted dp pipe on my 2010 wrx do i have to download the stage 2 93 LWG instead of the other one i live in chicago too. Also rob did you wrap your perrin cat only itself with exhaust wrap because looks like there is no heat shield around there and its close to the axle boot. any advice would be great. thanks

i would do the normal stage 2 map and data-log. see if you over-boost, because all engines are different and u might not, even tho i do. if you do, log the LWG map and see how it turns out. No i didn't wrap anything on the DP, i was considering getting a heat shield since i have nothing on there right now (cobb) but i wanted to make sure it will fit without a problem because the stock one definitely wont!
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Old 12-17-2011, 10:15 AM   #12
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Sry not to thread jack but. Didn't wanna start a new thread on same issue I'm having..

Specs:
2003 WRX
3" Catless.Downpipe
Cobb SF intake
Cobb AP Stage 2 v310

Making ~19.2 psi boost.. also at wot in higher gears I'm getting a loud loud howling doesn't appear to have any leaks ect.. but could be overlooking something.. any ideas? Thanks.
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Old 12-17-2011, 12:14 PM   #13
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did you try lwg map?
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Old 12-17-2011, 12:27 PM   #14
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Not yet haven't had time to drive the car since last week.. didn't know if it was a mechanical issue.or tune..
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Old 12-18-2011, 12:01 PM   #15
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Quote:
Originally Posted by preto789 View Post
Sry not to thread jack but. Didn't wanna start a new thread on same issue I'm having..

Specs:
2003 WRX
3" Catless.Downpipe
Cobb SF intake
Cobb AP Stage 2 v310

Making ~19.2 psi boost.. also at wot in higher gears I'm getting a loud loud howling doesn't appear to have any leaks ect.. but could be overlooking something.. any ideas? Thanks.
I would go ahead and get a data log (see our video below). Then we can go from there:

Try to avoid going WOT in higher gears (like 4th or 5th) for now.

Bill
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Old 12-19-2011, 04:48 PM   #16
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Old 12-20-2011, 08:32 AM   #17
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Quote:
Originally Posted by preto789 View Post
Boost looks fine in these logs. In what gear are you seeing 19+ psi?

Your airflow looks to be a tad low for stage 2 and some of your long-term fuel trims are trending to the more extreme positive end. This may be indicating that you have the so-called "tired" MAF sensor that is common with these older cars. I would go ahead and replace the MAF sensor with a new one. I know it is an unexpected expense, but it is so critical to safe engine operation, that if there is any doubt, it is best to replace it, especially on the older Subarus.

I would also get a pressure/smoke test of the intake tract done.

Bill
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Old 12-20-2011, 11:16 AM   #18
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19psi was before lwg tune. Just cleaned maf.. maybe I fubar'd something ill def check into getting another and as far as smoke test goes do do you think the manifold has a leak?
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Old 12-20-2011, 01:17 PM   #19
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Quote:
Originally Posted by preto789 View Post
19psi was before lwg tune. Just cleaned maf.. maybe I fubar'd something ill def check into getting another and as far as smoke test goes do do you think the manifold has a leak?
Have you or anyone else touched the factory uppipe at all? How loud is the howling noise?

Bill
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Old 12-20-2011, 04:31 PM   #20
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It was pretty loud.. someone suggested that maybe a fender piece was making the noise.. can get it to make it again plus it was over 120mph don't do that often..

And as far as I know no one had touched it other than mods listed.. although I did buy it used..
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Old 12-20-2011, 05:01 PM   #21
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Quote:
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It was pretty loud.. someone suggested that maybe a fender piece was making the noise.. can get it to make it again plus it was over 120mph don't do that often..

And as far as I know no one had touched it other than mods listed.. although I did buy it used..
Well, if it only occurs at high vehicle speeds, then it probably is something on the exterior that you are hearing.

Bill
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Old 12-20-2011, 06:45 PM   #22
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Check both of your front fender wheel liners. I have gotten my car up to 150 and they tear out around the bolt that holds them in. I have an 11 STI. There is only one bolt, the rest of it is those plastic push things. Even after replacing them we had to use bigger washers that hold it in because the bolt is right next to the edge of the wheel liner it rips easily. It does sound like a howling noise.
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Old 12-20-2011, 07:29 PM   #23
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If the tune looks fine then ill check there?
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Old 12-21-2011, 01:36 AM   #24
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Yeah if its like on the 2011 STI they rip out easily from the one point where there is an actual bolt holding it, poor design. Just make sure none of the fender liner is hanging outside the bumper cover. Only because of where I live and work can I actually get my car up to those insane speeds. It takes a while too, but the car will get up to 157- 161 mph on a straight downhill! When I do it though there is nothing to hit where I am.
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Old 12-21-2011, 09:30 AM   #25
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Quote:
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If the tune looks fine then ill check there?
I would go ahead and replace the MAF sensor with a new one. Even if it ends up not being the problem, it is cheap insurance given the age of the car and how critical that sensor is. If you replace it, get another WOT log and we can see if there was a improvement in the reported airflow.

Bill
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