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Old 05-20-2013, 11:14 AM   #1
rxz88m
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Default 12 wrx stage 2 loss of power

I have a 12 WRX with Invidia catted downpipe, cat back, aem cai, GFB blow off valve and Cobb Accessport Stage 2 lwg map. It's been almost a week since installing the DP and catback and I'm noticing a notable loss of power. When I get on the gas around 3k RPM, the boost just sounds loud and like its spooling a lot louder than normal. During that time I feel like a have no power. It doesn't put you back in the seat like it used to. On the Accessport I've been watching the boost and it still boosts around target boost and eventually see it go to 24, 23 psi. I've also gotten wastegate solenoid CEL once before the exhaust install and once since the install. Car seems fine around normal driving below 3k rpm but anything higher and it definatly doesnt feel right. Anyone have any ideas? I've been looking and seeing info about IC to throttle body clamps could be loose or blown and other things about waste gate up pipe might could be bad. Another noticeable issue is the car seems to backfire a whole lot more when shifting or getting of the gas. If anyone has any good info please your advice is needed. Don't really feel like putting everything back to stock and taking to dealer but I'll do so if that's what it takes.
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Old 05-20-2013, 11:19 AM   #2
Dakota D
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Is that map for a aem cai?i.didn't think.cobb had a aem cai stage 2 map,that could cause issues.also the cel is from overboosting
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Old 05-20-2013, 11:22 AM   #3
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You shouldn't be hitting more than 18psi of boost. The wastegate CEL is from overboosting. Make sure you're using the correct stage 2 map for your octane and AEM intake. If that isn't the problem, try putting the stock BPV back on to see if it's your BOV leaking. Maybe take some logs for us so we can actually see what's going on.
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Old 05-20-2013, 11:32 AM   #4
rxz88m
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Yes I'm using stage 2 w/ AEM and 91 ACN map. I was thinking of getting an external waste gate due to the over boosting but I'm wondering if there's a bigger problem now that I'm not getting any power. What variables should I have on the data log?
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Old 05-20-2013, 11:38 AM   #5
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"loss of power" and "the boost just sounds loud and like it's spooling a lot louder than normal" Have you checked anything under the hood yet? If it sounds louder, it's probably a boost leak. Which would also explain the increase in afterfire.
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Old 05-20-2013, 11:44 AM   #6
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Throttle body to intercooler hose/clamp. Usually culprits
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Old 05-20-2013, 11:52 AM   #7
rxz88m
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I'm heading to a shop first thing I'm going to have them check are the hose clamps or the hose itself. Hopefully it's nothing more
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Old 05-20-2013, 12:16 PM   #8
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Backfiring is because of the BOV. Your MAF accounts for that extra air that your BOV is venting and as a result you run rich for a split second between shifts. The backfire is this excess fuel being burnt off.

Lose the BOV and go back to the stock BPV or a full recirc valve.

When you get the overboost code, what gear are you in? What kind of load are you putting on the engine?
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Old 05-20-2013, 12:31 PM   #9
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I just had the loss of power issue. Just fixed it:

Replaced throttle body hose w/ silicone aftermarket one.

Replaced the hose clamps with T-clamps.

Problem solved.

That was also causing me to back/afterfire.

Good luck dude.
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Old 05-20-2013, 12:40 PM   #10
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An EWG will fix boost creep and will require a tune, so skip it.
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Old 05-20-2013, 02:49 PM   #11
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Yeah I'm going to have the shop check that hose and clamps and go back to stock bpv.

As for the CEL. Both times were in 4th gear and hard on the throttle
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Old 05-20-2013, 05:13 PM   #12
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All the shop had told me was to get a tune specific for my car. He didn't find anything wrong with the hoses. Said there were no leaks just that I needed to get a better tune than the stage 2 from Cobb. Does this sound right to anyone?
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Old 05-20-2013, 05:22 PM   #13
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Think about it... the COBB maps are generic enough to work on every car in every climate. There's bound to be problems for certain people... look into getting an e-tune from Eric @ Torqued Performance or some other reputable shop. I gave up on the COBB maps once I started getting those overboost CELs and haven't had any problem with the TP maps since.

But seriously... ditch the BOV. The Forge BPV sounds amazing and your car will thank you.
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Old 05-20-2013, 05:44 PM   #14
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That's true. I'll call them right now. I know Crawford performance does etunes as well. How much did you pay for the torqued performance tune? I made a mistake it is a bpv. I think I'll just go back to stock tho
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Old 05-20-2013, 05:44 PM   #15
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I still think it's a boost leak. That's not something you can see by just looking at the hoses. I would personally take off the IC/TB hose, remove the rubber gasket in it that seems to cause so many people problems, and then reinstall the hose good and tight.

With a boost leak, when the turbo is spooling up, that compressed, metered air is leaving the system, throwing off Air/Fuel ratios and causing your car to run extremely rich, which accounts for both the power loss and backfiring and more noise.

Edit: Do you have an aftermarket downpipe on the car to go with the stage 2 cobb tune you are using?
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Old 05-20-2013, 06:06 PM   #16
rxz88m
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If it doesn't hurt anything to remove those gaskets, Ill just go ahead and do that. All those symptoms you are describing are exactly what I have. You thing removing the gaskets might help that?
And yes it's a catted Invidia DP and catback Invidia
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Old 05-20-2013, 06:19 PM   #17
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Quote:
Originally Posted by rxz88m View Post
Yeah I'm going to have the shop check that hose and clamps and go back to stock bpv.

As for the CEL. Both times were in 4th gear and hard on the throttle
If you're going WOT in 4th from a low RPM AND you are running an OTS stage 2+ map, you are almost guaranteed to overboost. As mentioned already, OTS maps are meant to be a one size fits most sort of deal. General suggestion...downshift. You will end up right in the powerband and are less likely to overboost.

As for the loss of power, if you overboosted at the level you are talking about, it is likely that your intercooler to throttle body hose popped off. Check the connections. Even if this wasnt the culprit its still a good idea to remove the rubber gaskets on the hose and torque the clamps back down.
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Old 05-20-2013, 07:10 PM   #18
rxz88m
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Anyone know a good DIY I could use to remove the gaskets on the IC-tb hose. I just don't want to screw things up
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Old 05-20-2013, 09:38 PM   #19
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It's really simple... the gaskets literally fall right off like the meat off a slow-cooked rib. You may have a little trouble aligning the TB->TMIC hose when putting it back on though.

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Old 05-21-2013, 05:35 AM   #20
Uncle Scotty
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Quote:
Originally Posted by rxz88m View Post
I have a 12 WRX with Invidia catted downpipe, cat back, aem cai, GFB blow off valve and Cobb Accessport Stage 2 lwg map. It's been almost a week since installing the DP and catback and I'm noticing a notable loss of power. When I get on the gas around 3k RPM, the boost just sounds loud and like its spooling a lot louder than normal. During that time I feel like a have no power. It doesn't put you back in the seat like it used to. On the Accessport I've been watching the boost and it still boosts around target boost and eventually see it go to 24, 23 psi. I've also gotten wastegate solenoid CEL once before the exhaust install and once since the install. Car seems fine around normal driving below 3k rpm but anything higher and it definatly doesnt feel right. Anyone have any ideas? I've been looking and seeing info about IC to throttle body clamps could be loose or blown and other things about waste gate up pipe might could be bad. Another noticeable issue is the car seems to backfire a whole lot more when shifting or getting of the gas. If anyone has any good info please your advice is needed. Don't really feel like putting everything back to stock and taking to dealer but I'll do so if that's what it takes.

yer runnin 23-24psi on a ap stage 2 map
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Old 05-21-2013, 09:03 AM   #21
Sidewinderpb
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There are literally 5 bolts (including bpv). Super easy and quick.
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Old 05-21-2013, 09:30 PM   #22
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*sniff*
*sniff*


i smell a blowed up motor around heeeer sumware
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Old 05-22-2013, 10:08 AM   #23
matigas_TT
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Quote:
Originally Posted by Sidewinderpb View Post
I just had the loss of power issue. Just fixed it:

Replaced throttle body hose w/ silicone aftermarket one.

Replaced the hose clamps with T-clamps.

Problem solved.

That was also causing me to back/afterfire.

Good luck dude.
This!!! I approve!
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Old 05-22-2013, 10:46 AM   #24
Sidewinderpb
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Yeah what a PITA that was. Every morning I would take the tmic off, re-do the clamps, and put it back together. Then I would drive to work, blow the hose off and leak until I got home. I would then fix it, test, and blow it off. Rinse and repeat.

Just replace them lol
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Old 05-22-2013, 03:00 PM   #25
rxz88m
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UPDATE...I just took off the IC to TB hose and found the side where the hose connects to the TB wasn't even on anymore and was completely off. I took off the gaskets on both sides of the hose and put the hose back on and my car runs perfectly. Feels even better now. Thanks for the advice everyone.
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