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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > Turbo Control, Vacuum System, Pressure Converters etc.



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      07-23-2018, 01:24 AM   #89
Yozh
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Nice test with a spare turbo. What are the graphs of. Requested vs actual boost? Oh I see. Itís boost vs rpm. Your fist test in the DIS was of a turbine switchover. To me it shows a tired pressure converter. You can see in a video how on release the rod does not move back quickly. Your graph confirms it. Your boost falls off on switchover. At 3000 rpm you should be full LP turbo. Also to check is the compressor bypass. At this exact rpm it also opens.
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      10-04-2018, 07:36 PM   #90
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Where is the EUV for the engine mounts located?
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      10-05-2018, 01:00 AM   #91
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Under the intake manifold by the starter.
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      10-21-2018, 11:49 PM   #92
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i can't get these pressure converter connectors off. Insane design. What's the trick?

Edit: I got it. If yours are anything like mine, they're so brittle it doesn't matter what you do, the stupid clip thing which is maddening and impossible anyway will just shatter. Destroy it with gusto. It's not really needed. The electrical contacts are protected.
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Last edited by nicklockard; 10-21-2018 at 11:56 PM.
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      11-09-2018, 01:25 PM   #93
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Upper rpm power drop

Have been hearing interesting noises on hard accelerations since Ive been deleted (about 4,000miles). Took a video to show the problem. I only let off once at the end of the pull when I hit 120mph... the noise you hear when I hit 105 mph was the power loss. And the fluttering noise while Iím accelerating is weird too...



Anyone have this similar problem or have a guess at what it could be? Iíll be replacing both pressure converters, I got 3 EUVs, new engine mounts and Iíll be testing all my vacuum lines with a handpump this weekend
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      Yesterday, 02:40 AM   #94
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I would log some essential parameters.
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      Yesterday, 01:13 PM   #95
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In the process of replacing all vacuum lines and engine mounts right now.. replaced the EUV for the compressor bypass valve, both pressure converters, have the vacuum reservoir coming on Thursday. What parameters do you recommend? I have a nice 200mile trip this weekend, all highway miles (which is where the problem happens).
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      Today, 01:22 AM   #96
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So fluttering past 2k rpm, you are fueling it good. Loss of power but no limp or cel. Is the car stock or deleted. If latter whoís tune. Fluttered is quite loud sounds like a turbo. Could be your turbo switchover not opening. Try replicating once you renew your vac lines and converters. For logging I would start with speed, rpm, pedal position, boost requested vs actual vs emp, rail requested vs actual and airmass requested vs actual. Once you narrow it down you can start logging more specific parameters. Use TestO for logging. If you do a lot of parameters donot on short full fuelling runs and not on an extended trip. Too much data.
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      Today, 08:33 AM   #97
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Quote:
Originally Posted by Yozh View Post
So fluttering past 2k rpm, you are fueling it good. Loss of power but no limp or cel. Is the car stock or deleted. If latter whoís tune. Fluttered is quite loud sounds like a turbo. Could be your turbo switchover not opening. Try replicating once you renew your vac lines and converters. For logging I would start with speed, rpm, pedal position, boost requested vs actual vs emp, rail requested vs actual and airmass requested vs actual. Once you narrow it down you can start logging more specific parameters. Use TestO for logging. If you do a lot of parameters donot on short full fuelling runs and not on an extended trip. Too much data.
No limp or cel it seems like boost dies for a sec, then it builds back up and will haul ass through the rest of the gear. And yes sounds like turbo surge to me.. car is deleted. But it had the same fluttering problem before the delete so I donít think the tune is the problem. I just didnít have enough power to surge the turbo before. And I will try to log some short data on those parameters replicating whatís happening if the vacuum lines donít solve the problem.

Canít I manually test the turbo switch over with a vacuum pump to see if the rod moves or not?
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