Air whooshing sound after JB4 install Please Help

sarconi11 · 02-10-2015, 05:32 PM

So today I installed a JB4 G5 on my e92 335xi (2008), this is actually the second time I've had a JB4 on the car. Previously I had no problems and loved the gains, but today was a different story. I took the car out early in the morning after the install for about an hour or so without pushing it hard and then let the car sit for about 3 hours. Took it back out after that and let the car warm up for about 20 minutes and then started pushing the car to its new limits. Around the fourth or so hard acceleration the car made a bang directly in front of me along with a whooshing sound. I immediately slowed down and then inspected the car, thinking it could possibly be the stock diverter valve but when I inspected it I didn't see anything wrong (although I suppose it could still be this). I started driving again and noticed that the whooshing sound is only heard while accelerating at a good speed, otherwise its not noticed during slow acceleration. The sound comes from directly in front of the driver and slightly to the left. Please let me know if anyone has any ideas, and thank you for taking the time to read this!

Also all systems are currently in good standing.

-Erich

marv85 · 02-10-2015, 05:40 PM

your chargepipe popped off, most probably.

sarconi11 · 02-10-2015, 05:51 PM

Ok, didn't have time to check in depth today but I will take a look in the morning. Thanks for the response!

Jeff@TopGearSolutions · 02-10-2015, 06:35 PM

Yea charge pipe or intercooler connection popped off.

Mike@N54Tuning.com · 02-10-2015, 06:42 PM

If charge pipe popped off you would get an instant check engine and under boost code.

Mike

TheYuriPanda · 02-10-2015, 09:07 PM

Quote:

Originally Posted by Mike@N54Tuning.com

If charge pipe popped off you would get an instant check engine and under boost code.

Mike

Really? Weird. I never did, and a few friends that happened to also never got the code.

Jeff@TopGearSolutions · 02-10-2015, 09:20 PM

Quote:

Originally Posted by Mike@N54Tuning.com

If charge pipe popped off you would get an instant check engine and under boost code.

Mike

Sometimes but not necessarily, remember, you need to underboost off target for at least 3-4 seconds sustained sometimes to trigger that code.

Mike@N54Tuning.com · 02-10-2015, 09:29 PM

Quote:

Originally Posted by Jeff@TopGearSolutions

Sometimes but not necessarily, remember, you need to underboost off target for at least 3-4 seconds sustained sometimes to trigger that code.

True, I just assume that the pipe popping off is under heavy sustained load, but I suppose it can pop in other circumstances.

Either way the likely culprit is the pipe or the cold FMIC connection.

Mike

02-10-2015, 05:32 PM	#1
sarconi11 Private First Class 6 Rep 162 Posts Drives: M2C Join Date: Jul 2009 Location: Mechanicsburg, PA iTrader: (1)	Air whooshing sound after JB4 install Please Help So today I installed a JB4 G5 on my e92 335xi (2008), this is actually the second time I've had a JB4 on the car. Previously I had no problems and loved the gains, but today was a different story. I took the car out early in the morning after the install for about an hour or so without pushing it hard and then let the car sit for about 3 hours. Took it back out after that and let the car warm up for about 20 minutes and then started pushing the car to its new limits. Around the fourth or so hard acceleration the car made a bang directly in front of me along with a whooshing sound. I immediately slowed down and then inspected the car, thinking it could possibly be the stock diverter valve but when I inspected it I didn't see anything wrong (although I suppose it could still be this). I started driving again and noticed that the whooshing sound is only heard while accelerating at a good speed, otherwise its not noticed during slow acceleration. The sound comes from directly in front of the driver and slightly to the left. Please let me know if anyone has any ideas, and thank you for taking the time to read this! Also all systems are currently in good standing. -Erich
	Appreciate 0 Tweet Quote

02-10-2015, 05:40 PM	#2
marv85 Colonel 70 Rep 2,626 Posts Drives: '07 E92 335i MT Join Date: Jun 2010 Location: Bay Area iTrader: (7)	your chargepipe popped off, most probably. __________________ '07 E92 335i 6MT- HP650, inlets/outlets, ER FMIC, VRSF CP, LPFP stg2, CSF rad, 'is Aux rad, ER OC, Ohlins, M control arms, eibach front sway bar. '05 C55 AMG SOLD - '22 Tesla M3P \| '10 E92 335i M, 6MT COBB, FBO, st2 LPFP, Mfactory LSD \| '07 E90 335i, PTF COBB E50, FBO, HFS4
	Appreciate 0 Quote

02-10-2015, 05:51 PM	#3
sarconi11 Private First Class 6 Rep 162 Posts Drives: M2C Join Date: Jul 2009 Location: Mechanicsburg, PA iTrader: (1)	Ok, didn't have time to check in depth today but I will take a look in the morning. Thanks for the response!
	Appreciate 0 Quote

02-10-2015, 06:35 PM	#4
Jeff@TopGearSolutions 3441 Rep 79,211 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	Yea charge pipe or intercooler connection popped off.
	Appreciate 0 Quote

02-10-2015, 06:42 PM	#5
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)	If charge pipe popped off you would get an instant check engine and under boost code. Mike
	Appreciate 0 Quote