JB4 Making High Pitch Noise

AX75F92 · 12-12-2015, 11:41 PM

I have rewired the power to my JB4 to source 12V power from the boost solenoid. Everything is working properly but I've noticed a high pitch ringing noise coming from the solenoid valve now.

The noise is only noticeable when the car is powered on without the engine running (i.e. after locking/unlocking the doors, when turning IG power on, after shutdown). It goes away once the car completely powers itself down, at that time I also hear what sounds like a release of air coming from the solenoid valve. If I disconnect the solenoid valve the noise stops.

I'm curious if anyone else has experienced this.

Jsoboti · 12-13-2015, 09:32 AM

I have the exact same noise. It is also noticeable when when accelerating hard.

Not present under normal driving conditions though, maybe because the JB4 isn't "working" at that point?

AX75F92 · 12-13-2015, 11:44 AM

Quote:

Originally Posted by Jsoboti

I have the exact same noise. It is also noticeable when when accelerating hard.

Not present under normal driving conditions though, maybe because the JB4 isn't "working" at that point?

Now that you mention it, I can hear it under WOT as well. I noticed it but wasn't sure if it was just some high pitched turbo spool noise.

Glad to see someone else with the same experience. Maybe it's normal.

The JB4 should still be "working" under light throttle conditions because in ISO mode the JB4 has full control of boost. That's something I forgot to mention...my JB4 is setup as ISO boost control.

SHEEDI · 12-13-2015, 12:22 PM

check for oil leaks and Rear main seal

Dhillon92 · 12-13-2015, 12:46 PM

I also have a high pitched sound every now again, I can usually hear it when cruising.

Mike@N54Tuning.com · 12-13-2015, 01:15 PM

Might just be time for a new boost solenoid. Changing the default wastegate position setting within the interface may also help.

Mike

AX75F92 · 12-14-2015, 11:02 PM

Quote:

Originally Posted by Mike@N54Tuning.com

Might just be time for a new boost solenoid. Changing the default wastegate position setting within the interface may also help.

Mike

The thing is, without the JB4 connected the valve is silent.

Jsoboti · 12-15-2015, 09:58 AM

Quote:

Originally Posted by AX75F92

Quote:

Originally Posted by Mike@N54Tuning.com

Might just be time for a new boost solenoid. Changing the default wastegate position setting within the interface may also help.

Mike

The thing is, without the JB4 connected the valve is silent.

+1

AX75F92 · 12-31-2015, 08:18 PM

Im just going to assume there is nothing detrimental going on....

:

Dhillon92 · 12-31-2015, 08:23 PM

Now that ive reread the OP, I hear the high pitched noise for a while as well, and then the car farts and all goes away when it completely shuts down.

Never figured it would only happen with the jb4.

AX75F92 · 01-01-2016, 04:19 PM

Quote:

Originally Posted by Dhillon92

Now that ive reread the OP, I hear the high pitched noise for a while as well, and then the car farts and all goes away when it completely shuts down.

Never figured it would only happen with the jb4.

Lol yup. That's exactly it. You hear a fart or sigh and then it's quiet. You can also hear it under heavy acceleration.

AX75F92 · 05-05-2016, 07:19 PM

Just bumping this to see if anyone else has the same thing going on

12-12-2015, 11:41 PM	#1
AX75F92 Private 4 Rep 94 Posts Drives: 335 Join Date: Jul 2015 Location: oc iTrader: (0)	I have rewired the power to my JB4 to source 12V power from the boost solenoid. Everything is working properly but I've noticed a high pitch ringing noise coming from the solenoid valve now. The noise is only noticeable when the car is powered on without the engine running (i.e. after locking/unlocking the doors, when turning IG power on, after shutdown). It goes away once the car completely powers itself down, at that time I also hear what sounds like a release of air coming from the solenoid valve. If I disconnect the solenoid valve the noise stops. I'm curious if anyone else has experienced this.
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12-13-2015, 09:32 AM	#2
Jsoboti Lieutenant 28 Rep 583 Posts Drives: 2011 335i E92 M-Sport 6MT Join Date: May 2014 Location: Mississippi iTrader: (0)	I have the exact same noise. It is also noticeable when when accelerating hard. Not present under normal driving conditions though, maybe because the JB4 isn't "working" at that point? __________________ JB4 G5 ISO FF \| BMS Performance Intake \| BMS Wheel Spacers \| VRSF Catless DP \| Red CYBA Scoops \| Supreme Power Lowering Perches \| VRSF Charge Pipe \| VMR 810 19x8.5 ET35 19x9.5 ET33 \| Michelin PSS 235/265 \| BMS CDV \| BMS Clutch Stop \| 4'' Tips
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12-13-2015, 12:22 PM	#4
SHEEDI Banned 602 Rep 2,703 Posts Drives: 2009 335i - Sport PKG Join Date: Jun 2009 Location: NY iTrader: (0) Garage List 2009 BMW 335i [8.50]	check for oil leaks and Rear main seal Last edited by SHEEDI; 12-13-2015 at 12:28 PM..
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12-13-2015, 12:46 PM	#5
Dhillon92 Captain 82 Rep 604 Posts Drives: '11 335xi Join Date: Jul 2014 Location: Toronto iTrader: (0)	I also have a high pitched sound every now again, I can usually hear it when cruising.
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12-13-2015, 01:15 PM	#6
Mike@N54Tuning.com Joint Chiefs of Staff 4918 Rep 115,980 Posts Drives: 2007 335i, 2015 M3 Join Date: Dec 2008 Location: N54tuning.com iTrader: (89)	Might just be time for a new boost solenoid. Changing the default wastegate position setting within the interface may also help. Mike
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12-31-2015, 08:18 PM	#9
AX75F92 Private 4 Rep 94 Posts Drives: 335 Join Date: Jul 2015 Location: oc iTrader: (0)	Im just going to assume there is nothing detrimental going on....:
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12-31-2015, 08:23 PM	#10
Dhillon92 Captain 82 Rep 604 Posts Drives: '11 335xi Join Date: Jul 2014 Location: Toronto iTrader: (0)	Now that ive reread the OP, I hear the high pitched noise for a while as well, and then the car farts and all goes away when it completely shuts down. Never figured it would only happen with the jb4.
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05-05-2016, 07:19 PM	#12
AX75F92 Private 4 Rep 94 Posts Drives: 335 Join Date: Jul 2015 Location: oc iTrader: (0)	Just bumping this to see if anyone else has the same thing going on
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