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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > JB4 Succeses, but now circus whine



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      07-02-2015, 08:21 AM   #1
jjamal99
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JB4 Succeses, but now circus whine

I bought my 335i about 2 months ago, and installed the JB4 a month ago. Install went fine and the car felt faster but only marginally so. After turning on the boost gauge override I noticed the car was only peaking at 10lbs psi. Often hovering around 8-9lbs of psi.

Last week I added a little bit of corn to the car along with the flex fuel wires and STILL didn't feel that much faster, so I thought something had to be wrong.

I bought the JB4 used and figured maybe it needed a firmware update but I didn't have a PC. Anyways after the trouble of getting my hands on a PC and hours messing with the firmware to figure out I installed the wrong firmware and needed the ISO I FINALLY have the JB4 working the way it should be and PHEW. Holy Shit Batman!

Now I'm making 14-15lbs of boost as I should be, and spiking in the mid 16's. The car feels so fast! The boost also spools up wayyyy quicker and is wayyy more responsive. I didn't realize I had so much turbo lag! I thought it was laggy but this was my first FI car and I figured that's how things were. Gas mileage went up from 17mpg to 21 which isn't bad either.

Unfortunately... now I have a new problem...

When the car spools up and hits max boost or breaks about 11psi there is this hoorendous whine. I'm not sure where it's coming from but it sounds like a circus whistle or something. It's awful because here I come whistling down the street

Anyone have an idea what the issue is?
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      07-02-2015, 09:46 AM   #2
weehe126
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boost leak
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      07-02-2015, 10:17 AM   #3
jjamal99
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That's what I was thinking... but if there was a boost leak wouldn't it still whine at less PSI just not as loud? It's like instaneous on and off right after it hits 11-13psi.
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      07-02-2015, 10:41 AM   #4
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Not necessarily, the boost at that PSI might be the amount it takes to push out from where it is leaking from.

It may not leak at all with lower boost and then shoot out when you reach ramming speed.
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      07-02-2015, 10:44 AM   #5
JBird..
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Check your charge pipe. I've had many friends with that same issue on the stock charge pipe and it was very loose when they checked.
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      07-02-2015, 11:02 AM   #6
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Boost leak for sure. It happened to me right after an intercooler install and I think I re-did it at least 3 times before I was able to get it right. Not sure which clamp on which pipe or whether it was the charge pipe connection. Anyway don't keep pushing it as you may over spin the turbos trying to make the same amount of boost.
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      07-02-2015, 12:23 PM   #7
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Alright, I'll check for a leak somewhere. I have a Vishnu chargepipe I believe so I'll start with the connectors there.

Is the old water and soap trick still valid for finding leaks? I saw a video that I think was created by BMS for how to find a boost leak but I don't have the tools required at the moment.
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      07-02-2015, 02:12 PM   #8
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I second the boost leak. Check charge pipe as the most likely source.

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