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Car Problems? NG900 or old 9-3 Only If you're experiencing problems with your NG900 or 9-3, post your question in here. CEL Code or GTFO!

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Old 05-25-2010, 09:31 AM   #21
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If you think it's the wastegate then remove the arm and make sure it's not sticking, if it is then PB the hell out of it and work it back and forth. If this does nothing then wire it shut and see how it boosts. Have you taken the BPC out of the equation to see how it boosts?
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Old 05-27-2010, 06:44 PM   #22
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Finally got to unhooking the electrical connection on the BPC tonight...and I got base boost of about 6 psi, consistently. So that would point towards my wastegate assembly operating fine, right? But that would make me think bad BPC, which I don't understand, because this one came off a stage 5 Saab.

I have not gotten to the rod part yet..hopefully on Saturday once I'm all moved out of the apartment and finals are over I can get to really tackling this and other problems on my car.
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Old 05-27-2010, 08:59 PM   #23
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I messed with my '97 900SE to detune it for my daughter's sake.
With BPC unplugged, it boosted dangerously into the red.
Removed and plugged the three lines- overbosted.
With linkage removed, it flopped open to full bypass and would barely boost to the beginning of the yellow.
Felt like 130 HP.
So, my understanding is that the rod holds the wastegate closed until the BPC is told to push the rod to open the wasegate.
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Old 06-05-2010, 12:51 PM   #24
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I was told by my tuner that unplugging the BPC would result in base boost, which is the result I got...

A little more of an update. Of course it's raining today when I finally have time to work on it. Anyways, all the BPC lines are in good shape. Also, I noticed my car will now NOT boost past about 7 psi (and yes, BPC is totally plugged in now). The turbo spools up like it's gonna shoot past 7 psi, but then it quiets down and I'm stuck at 7 psi. It wants to boost more but something isn't letting it do so. If I can find my original BPC I'm gonna swap that back in and see if anything changes...

Do these symptoms lead to a wastegate actuator arm issue? The weird thing is, the car used to boost great up to 25 psi (which was obviously too much for what I was supposed to be getting), but now it won't get past 7? I wish I could go out and work on it...
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Old 06-05-2010, 01:21 PM   #25
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Quote:
Originally Posted by fiveiron9688 View Post
I was told by my tuner that unplugging the BPC would result in base boost, which is the result I got...

A little more of an update. Of course it's raining today when I finally have time to work on it. Anyways, all the BPC lines are in good shape. Also, I noticed my car will now NOT boost past about 7 psi (and yes, BPC is totally plugged in now). The turbo spools up like it's gonna shoot past 7 psi, but then it quiets down and I'm stuck at 7 psi. It wants to boost more but something isn't letting it do so. If I can find my original BPC I'm gonna swap that back in and see if anything changes...

Do these symptoms lead to a wastegate actuator arm issue? The weird thing is, the car used to boost great up to 25 psi (which was obviously too much for what I was supposed to be getting), but now it won't get past 7? I wish I could go out and work on it...
Id have your TD04 checked over by a turbo shop.
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Old 06-05-2010, 02:15 PM   #26
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Sounds like something is still unplugged hose or electrical as that should be about base boost.

Sleepy, I don't think this sounds like a turbo problem but a wastegate or bpc issue.
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Old 06-05-2010, 05:16 PM   #27
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Make sure all the lines are connected to their appropriate barbs; each of the lines on the BPC have letters embossed in them and on the barbs if you ever get them confused.
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Old 06-06-2010, 11:03 PM   #28
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Checked today: BPC is hooked up correctly, all vacuum hoses are good and hooked up properly (except one to the MAF, which had some strange boost controller when I bought it which I didn't notice. The plastic tee in that line is covered with electrical tape), wastegate actuator arm seems to move fine. It certainly required some effort to move it, but it didn't feel sticky or anything strange.

I'm starting to run out of ideas. Still have to find my original BPC and try that out yet again.

Oh, and did I mention my coolant is disappearing? Slowly, but surely. The SID informs me around once a week or so, with driving around 500 highway miles a week. And it looks to be sort of brownish. But the engine runs great, besides that boosting issue. My car is getting quite frustrating!
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Old 06-07-2010, 04:40 AM   #29
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source out a og9-3 BPC wiring harness and buy a new og9-3 BPC from eeuro for $45... these are extremely cheaper and more reliable than the ng900's BPC's... the og9-3 has a 2 wire where the ng900 has a 3 wire... so you just don't use one of the wires... and i would have too look at it to know which one... i will be doing this swap wed. because im sick of replacing these expansive ass things...
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Old 06-07-2010, 06:58 AM   #30
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Quote:
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source out a og9-3 BPC wiring harness and buy a new og9-3 BPC from eeuro for $45... these are extremely cheaper and more reliable than the ng900's BPC's... the og9-3 has a 2 wire where the ng900 has a 3 wire... so you just don't use one of the wires... and i would have too look at it to know which one... i will be doing this swap wed. because im sick of replacing these expansive ass things...
Don't you have to get the ECU tuned for that? I'm definitely considering it though...
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