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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Can this be real?? New turbos shot within a month?



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      10-07-2016, 07:44 PM   #45
V8bait
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Why not just put vacuum directly to the gates and take it for a quick spin with mhd showing you boost, see if boost comes up that way. Just let off don't run it out or anything but seems like a quick way to test a couple things directly and easily.
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      10-07-2016, 08:56 PM   #46
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With Chris help problem might have been traced down to bad vacuum pump. Did not go to mpi to much of a commute for right now.
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      10-07-2016, 09:45 PM   #47
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With Chris help problem might have been traced down to bad vacuum pump. Did not go to mpi to much of a commute for right now.
If the vacuum pump is bad, your brake booster won't function well either. How are the brakes?
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      10-07-2016, 10:00 PM   #48
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I don't notice anything different about the breaks. But on that hard brake line(I believe that is what it is) above the oil housing gasket when I pull it off after the car is running I don't hear a "whoosh" sound from it. I also just stuck a vacuum gauge on some lines and all read at 0.
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      10-07-2016, 10:07 PM   #49
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Quote:
Originally Posted by Pbforlife254 View Post
I don't notice anything different about the breaks. But on that hard brake line(I believe that is what it is) above the oil housing gasket when I pull it off after the car is running I don't hear a "whoosh" sound from it. I also just stuck a vacuum gauge on some lines and all read at 0.
If you are reading zero, even when running, then there is definitely an issue. It's either the pump itself or it's a major leak in the system (vacuum pump, brake booster, wastegates, solenoids, hoses.)
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      10-07-2016, 10:12 PM   #50
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Had it checked today for leaks and nothing showed up. So that is what probably pointed to vacuum pump being no good. I hooked up the vacuum gauge to the line from the top of the canister and also a line from the boost solenoid and read 0 in both locations
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      10-07-2016, 10:31 PM   #51
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Originally Posted by Pbforlife254 View Post
Had it checked today for leaks and nothing showed up. So that is what probably pointed to vacuum pump being no good. I hooked up the vacuum gauge to the line from the top of the canister and also a line from the boost solenoid and read 0 in both locations
Bad pump or majorly bad/cracked/missing lines from the pump/canister (the canisters are prone to fail so you should test vacuum at the canister inlet vacuum line too). Without vacuum the gates are free to slappy around while you make no boost, if you'd like i have a nice N/A economy tune you can run while you fix things :-)
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      10-07-2016, 10:39 PM   #52
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I will check at the inlet locations tomorrow. Even at the top of the canister I should still get vacuum correct? Just making I tested the vacuum right and it's not just how I'm hooking it up making it read 0
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      10-08-2016, 09:51 AM   #53
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I will check at the inlet locations tomorrow. Even at the top of the canister I should still get vacuum correct? Just making I tested the vacuum right and it's not just how I'm hooking it up making it read 0
Just to clarify, you are checking the correct side of the canister, right? One side will have vacuum but the other side just goes to the solenoid and wastegate and will have 0 vacuum.
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      10-08-2016, 10:52 AM   #54
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Do you still not have a logging module to show actual boost? I forget the threshold for 30ff being kicked if at wot and not meeting target.
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      10-08-2016, 02:17 PM   #55
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Just tested vaccum from inlet portion of canister and vaccum was 26.
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      10-08-2016, 02:56 PM   #56
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Quote:
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Just tested vaccum from inlet portion of canister and vaccum was 26.
Then the vacuum system is healthy. It could be solenoids, wastegates are stuck due to incorrect installation, or an actual boost leak.
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      10-08-2016, 03:52 PM   #57
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Solenoids are new. I was thinking the wastegates were hitting the downpipes which was making the clanking noise i was hearing. But what would explain no whoosh sound from the booster line?
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      10-08-2016, 08:09 PM   #58
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Seriously dude connect straight vacuum to the gates. If it boosts you have an issue with vacuum getting to the solenoids, or the solenoids controlling the vacuum (DME issue, mixed up vacuum routing etc). If it doesn't boost you have an issue with actuators or the gates themselves either binding etc, or a massive leak.
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      10-08-2016, 11:06 PM   #59
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How do I go about connecting straight vacuum to the gates?
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      10-09-2016, 09:02 AM   #60
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Quote:
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How do I go about connecting straight vacuum to the gates?
You can take the hoses coming from under the front of the engine cover and connect them to the hoses on the OUT side of your solenoids. (the solenoids are marked)

This will immediately send you into reduced power mode though because it won't be able to control boost.
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      10-09-2016, 09:25 AM   #61
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Have you replaced all your vacuum lines? If not, get about 8 feet of this in 3.5mm. http://www.verociousmotorsports.com/...ld-by-the-Foot

Also, I take out the hard lines that run right on top of the valve cover and run silicon all the way to the vacuum cans.
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      10-09-2016, 02:21 PM   #62
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So far he's been doing a hand over hand of the vac system and slowly eliminating possibilities. I agree with V8Bait; just plumb the vac lines direct to the turbos and see what happens. Be prepared to get off the throttle in a hurry because if the wastegates are on correctly you're going to build a ton of boost very fast and not be able to control it (your driving distance with this setup should be not very many feet... not miles or days)
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      10-12-2016, 12:20 PM   #63
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Had a chance today to hook up the out lines from solenoid to the inlets of the vacuum line. Car still felt same
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      10-12-2016, 01:52 PM   #64
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Get a vac gauge and hook them up to those lines coming frol the turbo. Pump it a few times and see if the rear gate arms move.

Last edited by pits200; 10-12-2016 at 07:29 PM..
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      10-12-2016, 07:15 PM   #65
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Agreed.
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      10-14-2016, 12:06 AM   #66
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What can cause the booster line to not make a whoosh when cap is unplugged after turning the car off?
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