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Old 08-06-2008, 06:03 PM   #1
Kahn23
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Default Can A Wastegate Stay Partially Open Due To Exhaust Carbon Build Up???

I have another thread related to this one, but I have a different question. For those that haven't read it: 06 WRX Stage 2 not reaching target boost for map.

Anyway reconnected tru boost last night to see if I could get closer to target boost and I did, but still not target (which is 18 or so) I'm hitting 16.5 and the duty cycle had to be really high to achieve this.

So I know turbo is working and it can't be line with restrictor pill in it because with tru bosst on, the lines not there. So can my wastegate flap be partially open due to a build up of carbon around it??

I am running really rich and that's the last thing I could think of. I've even changed the length of the wastegate actuator. Everything helps a little, but it never gets to where it should be.

Thanks
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Old 08-06-2008, 07:10 PM   #2
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I feel your frustration on this matter. I had the same problem with not being able to reach target boost on my 06. You can do one of two things to remedy this.

1. Install an 02-05 WG actuator(heavier spring rate)
2. Home depot spring mod. (PITA but it works)

I personally have an 05 actuator with a 10lb. helper spring on it. It took me a bit of WG tuning but the boost only falls off to 14psi at redline. (It fell of to 8.5psi. with the stock actuator)

Good luck and let me know what you come up with.
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Old 08-06-2008, 07:25 PM   #3
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Thanks for the info. The only thing for me is, I removed the vacuum line going to the wastegate in my turbo which should cause me to boost until the turbo explodes and I still only get to around what I am getting now with duty cycle set to 90%.

Is my turbo partially shot?? Boosting, but not where it should be?? I'm so confused??

It works, but never where it should. If I put stock map on it, it's lower than stock. Stage 2 lower than it should be. Works, but not right.

AAAAHHHHH!!
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Old 08-06-2008, 10:14 PM   #4
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bedtime bump for another point of view on the matter.
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Old 08-06-2008, 10:41 PM   #5
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Hope you didn't run LEADED
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Old 08-07-2008, 05:41 PM   #6
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Quote:
Originally Posted by tux121 View Post
Hope you didn't run LEADED
What the.....??? Do they even make leaded anymore? Thanks for helping with my problem.
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Old 08-08-2008, 02:09 PM   #7
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leaded = Racegas.
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Old 08-08-2008, 03:05 PM   #8
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Have you looked for any leaks? For pre-turbo, check for any carbon/soot build up around the flanges.
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Old 08-08-2008, 03:55 PM   #9
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Quote:
Originally Posted by STIBungy View Post
Have you looked for any leaks? For pre-turbo, check for any carbon/soot build up around the flanges.

I looked for leaks after the turbo and I did a pressure test before, but I didnn't look for any preturbo/uppipe leaks.

Could this cause low boost and running really rich??

I was also wondering if the o2 extension I have in for the downpipe could be causing me to run richer??

I know it had carbon build up in the turbo area when I put the DP on, but I didn't think it was too bad although it was about 6 mos. ago.
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Old 08-08-2008, 03:56 PM   #10
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Quote:
Originally Posted by bugeyesubie View Post
leaded = Racegas.


Thank You, I was not aware of that. And no, as long as I have had the car I have not run leaded.
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Old 08-08-2008, 04:05 PM   #11
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Catless?

Crapccessport?
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Old 08-08-2008, 05:18 PM   #12
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Quote:
Originally Posted by zFuGw4Gn View Post
Catless?

Crapccessport?
Yes, Catless Turbo back. No Crapcessport though. OTS Stage 2 Map from Osecuroms.
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Old 08-10-2008, 11:10 AM   #13
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A pre-turbo leak will cause slow spool up and most often, inability to hit target boost. It doesnt affect your afr though. The O2 extension wont cause it to run richer unless the sensor isnt there at all.

Quote:
Originally Posted by Kahn23 View Post
I looked for leaks after the turbo and I did a pressure test before, but I didnn't look for any preturbo/uppipe leaks.

Could this cause low boost and running really rich??

I was also wondering if the o2 extension I have in for the downpipe could be causing me to run richer??

I know it had carbon build up in the turbo area when I put the DP on, but I didn't think it was too bad although it was about 6 mos. ago.
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Old 08-10-2008, 02:42 PM   #14
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Quote:
Originally Posted by Kahn23 View Post
Yes, Catless Turbo back. No Crapcessport though. OTS Stage 2 Map from Osecuroms.
Hmm.. you should have no problems hitting target, in fact, if you have any issue at all, it should be creep / spiking.

+1 on the pre-turbo exhaust leak.
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Old 08-10-2008, 03:09 PM   #15
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I would pressure check the wastegate and see if it holds pressure at desired psi, you can use a coolant pressure tool with a vaccumn line attached to it to do this.. if it leaks down then you have problems with your wastegate
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Old 08-10-2008, 03:10 PM   #16
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go external!!
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Old 08-10-2008, 06:57 PM   #17
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Quote:
Originally Posted by Illsti View Post
I would pressure check the wastegate and see if it holds pressure at desired psi, you can use a coolant pressure tool with a vaccumn line attached to it to do this.. if it leaks down then you have problems with your wastegate
I am a little confused as to what you are talking about when you say coolant pressure tool w/ a vacuum line attached to it. Meaning what is a coolant pressure tool?

Basically I would have to just pump compressed air in there until I hit my desired PSI. Then the wastegate should open correct? If i hear air rushing around in there it would be considered a leak and the wastegate is not functioning properly right?

Do I have the car off? Where do I connect the pressure hose to straight to the wastegate bung or do I connect to the BCS??

By the way, thanks for all the help. It is very appreciated. I am attempting to make an appointment at AREA 1320 as soon as I can to get this figured out, but they are closed until tomorrow and have been for about a week.
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Old 08-10-2008, 07:08 PM   #18
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Quote:
Originally Posted by spyda23 View Post
go external!!
Pardon my ignorance on this subject pleas, but is a external wastegate just a blow off valve???

I am unsure if there is a differnece between the two.

If there is what is the difference?
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Old 08-10-2008, 07:14 PM   #19
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You have a internal wastegate correct? if so hook into the nipple on the wastegate itself with the car off. say your desired boost is 18psi the wastegate arm should start to move around 17.5, 18 psi when checking the way i told you. if its starts to open sooner then you have to readjust the actuator arm, or if when you pump it up to say 18psi and it starts leaking down then you have a bad wastegate..

And +1 on going external. Good luck and let me know how u make out
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Old 08-10-2008, 08:01 PM   #20
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Thanks. I'll let you all know when i get this problem figured out.
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Old 02-25-2010, 01:59 PM   #21
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Quote:
Originally Posted by Kahn23 View Post
Pardon my ignorance on this subject pleas, but is a external wastegate just a blow off valve???

I am unsure if there is a differnece between the two.

If there is what is the difference?

No two way different things.
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Old 02-25-2010, 03:02 PM   #22
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Quote:
Originally Posted by Kahn23 View Post
Pardon my ignorance on this subject pleas, but is a external wastegate just a blow off valve???

I am unsure if there is a differnece between the two.

If there is what is the difference?

You're familiar with an internal wastegate, the flow path of exhaust is integrated into the turbine housing on the turbo. The flapper opens when you want exhaust gas to bypass the turbine. Perhaps in your case the flapper opens before you really want it to.

An external wastegate performs the exact same function, but instead of being limited to whatever is cast into the turbine housing, you can use a high quality bypass valve and higher flow mandrel bent exhaust tubing so you have better control over the bypass flow. It's also usually built with user adjustability, you can tighten the spring down easily, some even come with multiple spring options, or aftermarket springs of various sizes available. It just offers a lot more end-user control to adjust their boost. The obvious downside is that the piping before and after the turbo must be modified to be able to bypass the turbo completely.

Blow off valve goes in the intake piping. The section that's pressurized by the turbo. When you are in high boost, then decide to slow down, the throttle plate closes down. You want to be idling / engine braking, but there's 15+PSI pressure in the intake tract. The BOV opens and releases this unwanted pressure by either venting to atmosphere, or plumbing it back into the intake tract before the turbo.
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Old 02-25-2010, 05:12 PM   #23
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Quote:
Originally Posted by Kahn23 View Post
Yes, Catless Turbo back. No Crapcessport though. OTS Stage 2 Map from Osecuroms.

my 06 with AP and street tuner and a tbe hits 21-22psi every day....no problem
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Old 02-25-2010, 06:38 PM   #24
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A friend of mine had the same problem, his turbo inlet tube had a hole on the underside, once he replaced it with another one all was fine. Was running like that for months until he pulled it into a friends garage and they did a thorough check on everything.

Tom
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Old 02-25-2010, 10:29 PM   #25
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What is so crappy about an access port? I'd be impressed if there was anything to back up it being called "crap."
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