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Old 03-26-2013, 11:55 PM   #1
Trizzeb
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Default turbo or wastegate issues???

Forgive me if this has already happened to some one but im having real problems here, i checked around as best as i could oh well...

So heres the deal i have 2005 sti running like 95k miles, i have basically stage 2 full turbo back catless, intake,ap and a greddy type s bypass recirculation if it matters....... I am having boost control issues the cars targeting 17 psi but in first and second i can only hit 11 or 12psi...... 3-6 gear seems to be ok but the higher the rpm the less boost it seems to taper...i know my turbo seals are bad im getting quite a bit of oil in the intercooler but i hear no noises or nothing unusual.... oh and as a side note since the problem occured i have been getting back fire and flames when i get off the gas, i wrote it off as the car is feeding more fuel for the pressure that the turbos not supplying.... i have reflashed the map and tried even going back to stock..... something is wrong idk what

Please help!!

I can datalog the incidents if needed aswell

Thanks
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Old 03-27-2013, 12:22 AM   #2
ProfessWRX
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Quote:
Originally Posted by Trizzeb View Post
Forgive me if this has already happened to some one but im having real problems here, i checked around as best as i could oh well...

So heres the deal i have 2005 sti running like 95k miles, i have basically stage 2 full turbo back catless, intake,ap and a greddy type s bypass recirculation if it matters....... I am having boost control issues the cars targeting 17 psi but in first and second i can only hit 11 or 12psi...... 3-6 gear seems to be ok but the higher the rpm the less boost it seems to taper...i know my turbo seals are bad im getting quite a bit of oil in the intercooler but i hear no noises or nothing unusual.... oh and as a side note since the problem occured i have been getting back fire and flames when i get off the gas, i wrote it off as the car is feeding more fuel for the pressure that the turbos not supplying.... i have reflashed the map and tried even going back to stock..... something is wrong idk what

Please help!!

I can datalog the incidents if needed aswell

Thanks
the pressure sounds normal. You arent going to build up that much boost in first Or second gear.
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Old 03-27-2013, 12:35 AM   #3
Trizzeb
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the only thing is before the problem started i was able to hit full boost through all the gears and i was running the same map and everything.... and boost targets are the same through all gears as well, however actual psi is lower
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Old 03-27-2013, 08:54 AM   #4
art@grimmspeed
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Are you running a protune or AP OTS?
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Old 03-27-2013, 09:00 AM   #5
Trizzeb
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Off the shelf stage 2 on ap
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Old 03-27-2013, 10:46 AM   #6
norkkron
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not sure if relevant, but cobb says not to use catless DPs with their OTS maps
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Old 03-27-2013, 04:51 PM   #7
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Originally Posted by norkkron View Post
not sure if relevant, but cobb says not to use catless DPs with their OTS maps
Not relevant.
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Old 03-28-2013, 10:20 AM   #8
henria86
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YUP I'm havin the same problem too cant hit my target boost of 18 lbs only constant 15lbs . cant seem to find the issue. i smoke tested the car n changed all the vacum lines .
it was protuned hitting 18 lbs for 2 weeks then it stopped
thanks
henri
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Old 03-28-2013, 11:35 AM   #9
scoobasaurusrex
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check your wastegate actuator and swap out your bcs with a known working one.
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Old 03-28-2013, 12:53 PM   #10
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Manual boost controller, or stock?

The only thing that - bar a fubar'd turbo - is going to inhibit that turbo is the wastegate, and/or an exhaust leak. If you run a line directly from the wastegate actuator to the compressor, you should hit boost fine. I performed this test a while ago, and used it to identify a faulty OEM EBCS. Do NOT floor the car, but it will let you know if it is solely the boost controller that is inhibiting boost, or a pre-turbo exhaust leak.
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Old 03-28-2013, 01:02 PM   #11
Andrewxxcarlson
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Guarantee it's your wastegate actuator. Pop the e clip off, DON'T LOSE THIS CLIP IT TENDS TO SPRING OFF SO KEEO YOUR OPPOSITE HAND ON IT, break the 10mm locking nut. One turn at a time clockwise to tighten actuator arm. Put clip back on lock the nut. Go for a drive. If still not maybe one more turn. There's gotta be a certain amount of preload to keep the wastegate closed until target boost.

Then come back and tell me I'm right.

Last edited by Andrewxxcarlson; 03-28-2013 at 01:15 PM.
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Old 03-28-2013, 01:17 PM   #12
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Quote:
Originally Posted by Andrewxxcarlson View Post
Guarantee it's your wastegate actuator. Pop the e clip off, break the 10mm locking nut. One turn at a time clockwise to tighten actuator arm. Put clip back on lock the nut. Go for a drive. If still not maybe one more turn. There's gotta be a certain amount of preload to keep the wastegate closed until target boost.

Then come back and tell me I'm right.
Quote:
Originally Posted by OP
the only thing is before the problem started i was able to hit full boost through all the gears and i was running the same map and everything
Not sure that he should be adjusting the wastegate arm, rather than the BC if it was hitting boost before, without changing anything.
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Old 03-28-2013, 01:21 PM   #13
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Quote:
Originally Posted by BeastianSTI View Post

Not sure that he should be adjusting the wastegate arm, rather than the BC if it was hitting boost before, without changing anything.
It's a possibility that it is his bcs, but the same thing happened to me, got tuned, hit full boost for a couple weeks, adjusted 2 turns clockwise to add preload on the wastegate. Hit full boost for 6 months after. I then detuned my car, stage 2 OTS, noticed I was now over boosting. Back the wastegate arm 2 turns counterclockwise everything perfect.
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Old 03-29-2013, 01:22 PM   #14
Trizzeb
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So preloading the wastegate arm may solve the issue..? Or it could be the bcs? Ill try it today when I get a chance and see if I can find someone with a stock bcs I can see if it works
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Old 03-29-2013, 02:10 PM   #15
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Try the wastegate actuator first, it's easily reversible. Takes me about 7 mins including taking off heat shield.
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Old 03-29-2013, 02:14 PM   #16
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I didn't think the WGA on the VF turbos could be adjusted.
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Old 03-29-2013, 02:21 PM   #17
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Originally Posted by jbulls93 View Post
I didn't think the WGA on the VF turbos could be adjusted.
Ugh my mistake. Thought td :/ bcs would be good to test now... Lol
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Old 03-29-2013, 11:21 PM   #18
icemanftr
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Quote:
Originally Posted by Andrewxxcarlson View Post
Try the wastegate actuator first, it's easily reversible. Takes me about 7 mins including taking off heat shield.
Took me 6 mins... Little rusty there Andrew...
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Old 03-30-2013, 12:04 AM   #19
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Took me 6 mins... Little rusty there Andrew...
I didn't factor out the time I took to pound the beer...damn you!
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Old 03-30-2013, 12:21 AM   #20
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I didn't factor out the time I took to pound the beer...damn you!
I did I pounded one at 2 min mark and 5min mark
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Old 03-30-2013, 01:16 AM   #21
Andrewxxcarlson
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I did I pounded one at 2 min mark and 5min mark
I'm astonished! Congrats bud! That's impressive! *slow clap*
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Old 03-30-2013, 01:24 AM   #22
icemanftr
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I'm astonished! Congrats bud! That's impressive! *slow clap*
:-D lol
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Old 03-30-2013, 09:43 AM   #23
BeastianSTI
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Any luck op?
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Old 04-01-2013, 08:22 AM   #24
Trizzeb
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Quote:
Originally Posted by BeastianSTI View Post
Any luck op?
No luck thus far... under advisement from cobb im running the HWG mapp and still cant hit full boost however its much closer...... i am noticing that the wastegate arm has play in it when the cars off dont know if it should be that easy to move....? but other than that its looking more and more like i need bcs everything else checks out
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