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Old 09-06-2012, 01:08 AM   #1
UncleSchnitty
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Default Waste gate actuator arm question...

Ive been trying to figure out the answer to my problem here. Basically I had a brand new td04 installed on my 04 wrx. Using my AP I only saw 7-8psi so after some research I checked for restrictor pill, its there. Checked boost control solenoid, its good. Next step was the actuator arm. Now I don't believe this was touched on initial install so I gave it a couple turns at at time and kept checking. I'm up to 4 turns and now I'm hitting 10psi. should I keep going and see if that does it or should I assume its something else?
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Old 09-06-2012, 02:41 AM   #2
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have you checked for any boost leaks? what map are you running? mods? need more info.
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Old 09-06-2012, 02:50 AM   #3
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Had a boost leak test done before old turbo went, held just fine. After I got the new turbo I purchased a boost gauge and AP to monitor(I got paranoid) Saw it was running low so I suspected intercooler hoses, purchased samco and they are nice and tight. Im running stage 1 93oct cobb. no other mods on yet Im waiting to resolve this before putting on the dp and up.

Last edited by UncleSchnitty; 09-06-2012 at 03:01 AM.
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Old 09-06-2012, 09:14 AM   #4
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how did you "check boost control solenoid?"
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Old 09-06-2012, 06:30 PM   #5
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Hooked it up to the battery, it clicked on and I could blow threw it cleanly. also ffor good measure ordered another one and tried that
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Old 09-06-2012, 09:27 PM   #6
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Install your old wastegate actuator on the new turbo and see what happens.
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Old 09-07-2012, 01:10 AM   #7
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Unfortunately during a garage clean up my old actuator went m.i.a. I have gone 5 turns at this point and the car is pulling much better but I still only get about 10.5 psi. It is hitting 8 more regularly when just driving up hills or entering highways at mid throttle. The arm still has enough room to do about 10 more turns thats what leads me to belive they never adjusted it when they initially installed but I don't really wana go much further just in case its an exhaust leak somewhere like the uppipe/downpipe and damage the turbo. Any thoughts?
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Old 09-07-2012, 06:34 AM   #8
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the adjustment range is rarely maxed out--just because there is "enough room to do about 10 more turns" doesn't mean you should.

if you want a test of the mechanical wastegate and spring, completely disconnect the wastegate actuator pressure hose. carefully monitor your boost gauge to see if higher throttle angles and engine load causes a big spike in boost pressure. the turbo will NOT be limited in any way, so this is NOT a way to drive around--it is ONLY for a momentary test. do NOT do extended pulls like this or very bad things will happen.

if your car suddenly builds massive boost this way, then you know it is a control system issue: the ecu map, the wiring, etc. if the car is unable to build boost, then it is a mechanical system issue: it could be a massive exhaust leak, a massive induction leak, a worn out/busted turbo, a wastegate that does not completely seal/seat, a clogged cat, etc.
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Old 09-07-2012, 08:41 AM   #9
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ride5000: I was just using the "10 turns" as a reference to where I was at. As for disconnecting the wastegate hose, what would be a good test drive? I dont wana over do it so would a couple mile drive do it? Keep it under 5000? Or should I take it for 1 3rd gear pull and keep an eye on the gauge? What would you recommend?
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Old 09-07-2012, 08:52 AM   #10
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one pull is all you need. 2nd gear is plenty. keep your eye on the gauge constantly, and as soon as it hits a boost level you haven't seen yet, the test is done. you probably won't need to go past 5k rpms.
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Old 09-07-2012, 09:56 AM   #11
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So just pull the vac line off the actuator, drive down the road and check for spikes or lack of boost? Spikes mean everything is functioning and it's just tweaks while lack of boost equals a leak somewhere? I think I got it. Last question, what kinda boost ranges should I be looking at?
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Old 09-07-2012, 04:35 PM   #12
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if you pull the line off doesn't that mean it'll just be based on the spring inside the wastegate? I don't see how that would lead to spikes.
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Old 09-07-2012, 04:46 PM   #13
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Quote:
Originally Posted by tebriel View Post
if you pull the line off doesn't that mean it'll just be based on the spring inside the wastegate? I don't see how that would lead to spikes.
No. If you ran a line with no restrictor pill and bypassing the BCS you would get spring pressure. If you completely disconnect any vacuum/boost source from the wastegate actuator you would easily get over 20 psi.
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Old 09-07-2012, 04:55 PM   #14
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I guss if I give it gas till it gets to ~17 I'll know it doesn't have any mechanical problems or leaks anywhere correct?
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Old 09-07-2012, 05:15 PM   #15
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Quote:
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I guss if I give it gas till it gets to ~17 I'll know it doesn't have any mechanical problems or leaks anywhere correct?
exactly.

as SOON as you net more boost than you saw before, the test is done.

if you CAN'T then you also have your answer.
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Old 09-07-2012, 05:43 PM   #16
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Do I have to plug the tube that went to the actuator?
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Old 09-07-2012, 09:09 PM   #17
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Ok, well I just pulled the hose off the actuator. I didn't plug it just let it sit in there. My car in second gear only got to ~8psi. If I did this correctly then I'm guessing I have a leak somewhere. Anybody have any suggestions what my next step is?
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Old 09-08-2012, 01:54 AM   #18
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So I think I found the culprit, my bov gasket is basically no existent! Do you guys think this could cause that much of a boost loss. Even with the actuator hose off I was only getting about ~8psi. The people at rsd.com seemed to think its possible. I'll head to Subaru tomorrow and get a new gasket.
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Old 09-08-2012, 02:22 AM   #19
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The test you did was with no boost helping push the wastegate open, so either your wastegate is opening by itself (broken actuator), you have a large leak somewhere, or you have some major issue elsewhere (clogged cat, very low compression, etc...)

You can try wiring the wastegate shut and doing the same test again to rule out the wastegate actuator. Wrap stainless steel wire around the wastegate lever, loop it to a bolt hole and twist it down to keep it shut. If you're still only getting 8psi, you have a massive intake leak (likely) or a crack in your turbine housing (unlikely)

And yes, no gasket at the BPV would definitely result in a large leak.
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Old 09-08-2012, 02:30 AM   #20
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Quote:
Originally Posted by UncleSchnitty View Post
So I think I found the culprit, my bov gasket is basically no existent! Do you guys think this could cause that much of a boost loss. Even with the actuator hose off I was only getting about ~8psi. The people at rsd.com seemed to think its possible. I'll head to Subaru tomorrow and get a new gasket.

Yup.. Possible no BOV gasket would probably leak especially under boost
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Old 09-08-2012, 02:30 AM   #21
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I really hope its just the leak from the bov gasket missing. After that my plan is to either 1. get an intake/exhaust leak test. 2. put on the cattless uppipe/downpipe just to rule out those exhaust points.... the turbo being is issue is kind of a mute point to check since it only has 1500 miles on it and was checked twice by subaru (that being said they didnt notice that it was only putting out only 7psi after the $2,000 install and another $250 to have it double checked)
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Old 09-08-2012, 05:01 AM   #22
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I've heard something about the spring ... in that case you'll need to turn it a lot in order to gain 5 psi
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Old 09-08-2012, 05:35 AM   #23
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Quote:
Originally Posted by EL GALLO View Post
I've heard something about the spring ... in that case you'll need to turn it a lot in order to gain 5 psi
dont post
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Old 09-08-2012, 06:46 AM   #24
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Quote:
Originally Posted by UncleSchnitty View Post
I really hope its just the leak from the bov gasket missing. After that my plan is to either 1. get an intake/exhaust leak test. 2. put on the cattless uppipe/downpipe just to rule out those exhaust points.... the turbo being is issue is kind of a mute point to check since it only has 1500 miles on it and was checked twice by subaru (that being said they didnt notice that it was only putting out only 7psi after the $2,000 install and another $250 to have it double checked)
wait. a dealer did a turbo R+R on this car and never shook it down?

that's some ****ed up **** right there.

you're on the right track with your thinking. the test you performed basically eliminated the ecu map and the solenoid and the wiring harness and the boost control system plumbing (hoses, restrictor pill etc) as the issue.

so what's left are the massive leaks or the wastegate not seating/sealing. certainly a missing bpv gasket is a pretty big leak, but i don't know if it's THAT big. a bad bpv itself could also cause this kind of issue (and is hard to troubleshoot because it doesn't cause a change in afr/cel).
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Old 09-08-2012, 12:34 PM   #25
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So I replaced it with still no luck. Im running out of ideas. I did a quick pull on the main road by by house maybe somebody can see something in my data log. Any help would be greatly appreciated at this point.

https://docs.google.com/open?id=0B0z...VM4MUZUaGJuOUE
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