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Old 01-14-2012, 11:24 PM   #26
Nd4spd1980
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Quote:
Originally Posted by drewvdw

Its possible, but somewhat unlikely. What are your current mods and are you tuned for them? What exactly is happening?

Edit: you must have an STi, you don't have the same leaky plastic bpv that the WRXs have.
I have zero mods. Stock 09 STi. In the upper revs 3500-redline in 3rd-6th gears it does not rip thru to redline like in 1st and 2nd. Instead it almost feels like little surges. It's definitely not smooth, almost like its bucking or there's a vacuum issue. I'm just so frustrated by it and can't wait for my 12 to arrive. I just feel bad for the next owner because it doesn't run like it used to and the dealership is telling me they can't recreate what I'm saying.
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Old 01-14-2012, 11:29 PM   #27
Nd4spd1980
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Quote:
Originally Posted by drewvdw

Its possible, but somewhat unlikely. What are your current mods and are you tuned for them? What exactly is happening?

Edit: you must have an STi, you don't have the same leaky plastic bpv that the WRXs have.
Stock 09 STI. It feels like a vacuum issue with bucking or surging from 3500 to redline in 3rd-6th gears. 1st and 2nd are fine. It used to run strong and smooth in all gears, but the dealership says they can't recreate what I'm talking about. So I'm eagerly awaiting my '12 and just feel bad for the next owner. Hopefully the dealer finds it when it's not a warranty repair issue and makes it right for whoever owns it next.
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Old 01-15-2012, 12:12 AM   #28
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Is that even a question?
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Old 01-15-2012, 01:11 AM   #29
joebreeves
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Quote:
Originally Posted by drewvdw
the stock endlinks will quite likely break with the added stress of a larger swaybar. you should always upgrade your endlinks if you upgrade your swaybar.
Even the SPT ones? Or do they come with endlinks?
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Old 01-15-2012, 01:43 AM   #30
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Originally Posted by joebreeves

Even the SPT ones? Or do they come with endlinks?
Any aftermarket sways will need aftermarket end links.

No Swaybar comes with end links.
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Old 01-15-2012, 02:42 AM   #31
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I got my '12 STI Limited almost 2 months ago and it is quite an upgrade from my stage II WRX that I had previously, in most ways that is. The powerband isn't nearly as smooth and strong as the REX but that's to be expected with a completely stock Subie vs a good protuned stage II. Since most of this thread is about newer model WRXs, I was wondering if anyone has any info about the 2012 STI? I'd like to know if any of you experts have any thoughts about weaknesses (i.e. any changes that went backward from previous STIs) in the 2012 and also any info about what turbo and other parts used on this vehicle. Is it different than the 2011, etc? Maybe someone can just point me in the right direction in an internet search? Thanks again Drew for the post!
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Old 01-15-2012, 04:40 AM   #32
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It will be the same as the '11. Its basically the same turbo as the WRX, just a different style compressor housing.
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Old 01-15-2012, 11:38 AM   #33
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Quote:
Originally Posted by philswrbrex View Post
I got my '12 STI Limited almost 2 months ago and it is quite an upgrade from my stage II WRX that I had previously, in most ways that is. The powerband isn't nearly as smooth and strong as the REX but that's to be expected with a completely stock Subie vs a good protuned stage II. Since most of this thread is about newer model WRXs, I was wondering if anyone has any info about the 2012 STI? I'd like to know if any of you experts have any thoughts about weaknesses (i.e. any changes that went backward from previous STIs) in the 2012 and also any info about what turbo and other parts used on this vehicle. Is it different than the 2011, etc? Maybe someone can just point me in the right direction in an internet search? Thanks again Drew for the post!
Perrrty sure they're still using the vf48. Click here for your viewing pleasure: http://www.iwsti.com/forums/2-5-lite...2-vs-dom3.html
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Old 11-12-2012, 06:34 PM   #34
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Just figured I'd bump this up, seems like there's more newbies asking about stage 2 mods and beyond.
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Old 11-12-2012, 06:41 PM   #35
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Quote:
Originally Posted by Nd4spd1980 View Post
I have zero mods. Stock 09 STi. In the upper revs 3500-redline in 3rd-6th gears it does not rip thru to redline like in 1st and 2nd. Instead it almost feels like little surges. It's definitely not smooth, almost like its bucking or there's a vacuum issue. I'm just so frustrated by it and can't wait for my 12 to arrive. I just feel bad for the next owner because it doesn't run like it used to and the dealership is telling me they can't recreate what I'm saying.
That's your horrible stock tune. Get an accessport and get it to 'stage 1' to smooth things out and make the car a ton more reliable.
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Old 11-12-2012, 09:08 PM   #36
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A 3 port solenoid isn't going to do ANYTHING for boost creep.
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Old 11-13-2012, 12:04 AM   #37
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I have never seen this post before, interesting.

Saved for a future read. Looks to have some damn good info
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Old 11-13-2012, 12:39 AM   #38
drewvdw
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Thank you, after doing this one small write up, I have a new found respect for Unabomber. These aren't as easy as one thinks...

Badler, I was under the impression that some VF52 users had boost creep issues until they switched to a 3 port setup. I may very well be wrong, but I'm just going off of my memory. It doesn't make much sense to me that it would have an effect looking back. I'll change it.

Edit: OP has been changed to reflect this.
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Old 11-13-2012, 09:17 AM   #39
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Quote:
Originally Posted by drewvdw
Thank you, after doing this one small write up, I have a new found respect for Unabomber. These aren't as easy as one thinks...

Badler, I was under the impression that some VF52 users had boost creep issues until they switched to a 3 port setup. I may very well be wrong, but I'm just going off of my memory. It doesn't make much sense to me that it would have an effect looking back. I'll change it.

Edit: OP has been changed to reflect this.
In my experience it can help but not eliminate it. Prior to my EBCS I would have occasional creep (intake and catless). Now, after my protune and EBCS I am yet to experience creep. HOWEVER, the weather is getting a lot colder so time will tell if creep starts to rear its ugly head again.

As per my tuner, an EWG is the only way to fully 100% eliminate this as creep is usually a mechanical issue. But again, there are varying opinions.
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Old 11-13-2012, 01:18 PM   #40
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^^^That's what I remember reading a few times.
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Old 11-13-2012, 01:34 PM   #41
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Quote:
Originally Posted by Badler View Post
A 3 port solenoid isn't going to do ANYTHING for boost creep.


This is correct. True boost creep is simply a mechanical problem and no amount of tuning will remedy that. What many people believe is boost creep is usually a poor tune or a stock BCS (bleed type system) reaching its capabilities of effectively venting the charged air (which is what I believe you are referring to in your guide). You make very valid points in your write-up but I believe some clarification might be needed in order to not confuse people.

As far as porting the turbo goes I have some personal experience. In an attempt to avoid boost creep on my vf39 (its in an 08 wrx [ya i know why no vf52, because cheap and they make similar numbers]) I opted to have some porting and polish work done. From my experience this actually hurt spool a bit (possibly over porting, but the work was done by a quality vendor) but for the most part did help with any creep issues in 3rd gear and below. 4th gear I did still experience fair creep (1-2 psi or so, even after spending a good amount of timing adjusting WGDC and TD tables), but I feel like it was still worth it. In order to combat my later spool time I went with an afteramrket uppipe and EWG combo. The spool increased dramatically and the boost creep was completely eliminated.

Just a little food for thought
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Old 11-13-2012, 01:53 PM   #42
drewvdw
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Did have the whole exhaust side ported or just the internal wastegate?
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Old 11-13-2012, 02:12 PM   #43
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Did have the whole exhaust side ported or just the internal wastegate?

Just the IWG and the intake on the cold side
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Old 11-13-2012, 02:35 PM   #44
drewvdw
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Did you tune for it? If not, I can imagine it would hurt the spool by opening up sooner than needed. Otherwise I can't see why it would hurt spool...Unless it was ported too much and was leaking.
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Old 11-13-2012, 02:43 PM   #45
Mr Wrex
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I suffered from creep as well, so I recently installed an EWG. Used a bracket arm to hold the IWG shut as well. Honestly a lot better than porting because you don't run the risk of overdoing it and you get that mean sound
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Old 11-13-2012, 03:07 PM   #46
NoGraffix
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Quote:
Originally Posted by drewvdw View Post
Did you tune for it? If not, I can imagine it would hurt the spool by opening up sooner than needed. Otherwise I can't see why it would hurt spool...Unless it was ported too much and was leaking.

Yes I made sure to tune for it since I ported it before installing it. As mentioned I believe it might have been over ported a bit but I'm by no means qualified to make any sort of determination on the quality of the porting. It was a reputible vendor here on NASIOC that I trusted to do good work, and when I got the product back I was very happy with the way it looked, not so much on the way it effected spool. I plan on switching turbos next summer and my plans are to have the turbo looked at by a local shop and get their determination on how well of a port job was done. As far as leaking goes I don't believe that was an issue. The actuator arm was working properly as was the wastegate flapper. My only other idea was the AVCS might not have been dialed in perfectly but the logs tell me it's basically spot on. I do not believe it has anything to do with the tuning.
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Old 11-13-2012, 09:34 PM   #47
drewvdw
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Strange...I don't know what to make of it.
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Old 11-13-2012, 10:02 PM   #48
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Great post Drew. Good basics for the "Afta Stage 2 crew" Where was this two years ago??
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Old 11-13-2012, 10:49 PM   #49
drewvdw
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Hahaha, well, it wasn't even a blip on my radar yet. I hadn't even gone to "stage 2" at this point 2 years ago. Now look at me, built motor from MPS being built, cams, valve springs, maybe some head work...a perfect setup for 450whp minus the turbo and tranny.
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Old 11-14-2012, 12:45 PM   #50
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Just reading this thread and great information. So this thread is a thread on ways to eliminate boost creep right? Not what is needed for a stage 2 cause anyone can tell you all you need is a DP and a tune.

This thread goes farther and more of a deeper sense of what other mods you can do to gain HP and also keep the boost creep down.

This is probably stage 3 parts also?
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