What is an acceptable ammount of boost leak?

SnapCoupe · 03-01-2018, 12:31 PM

After recently smoke testing my car to track down a boost leak on the intercooler hose clamps, I noticed that my BMS charge pipe has a small seep/leak from the motor side mount. I knew my car had a boost leak somewhere because I could hear a "squeal" coming from one of the silicone hoses under boost. Though, considering my charge pipe is metal I knew it wasn't originating from that. I replaced the gasket in between the CP and the motor and there is still a bit of smoke coming out. Is this something that will effect drivability/performance?

JETmn · 03-02-2018, 10:50 AM

It will cause you car to run rich, but it will not be consistent as the temperature changes. I would fix it.

SnapCoupe · 03-02-2018, 10:54 AM

Quote:

Originally Posted by JETmn

It will cause you car to run rich, but it will not be consistent as the temperature changes. I would fix it.

Considering there is only one way the CP mounts to the side of the motor, and there is only one gasket to replace (which I did), what would be the best way to go about fixing it? The charge pipe was the only modification on the car when I purchased it, and if it wasn't there I would've bought a ER CP as it seems much more robust. I know the BMS CP is pretty popular, so I assume this isn't considered "normal".

SnapCoupe · 03-05-2018, 11:29 AM

Still trying to figure this out...

Replacing the plugs and coils this weekend so I will have full access to mess about with the charge pipe. Is there anything to adjust to tighten up the charge pipe? I can move it around slightly, but given the BMS charge pipe doesn't bolt to the metal support for the factory charge pipe, is there any way to even remedy this?

JETmn · 03-05-2018, 12:16 PM

Did the clip give an audible snap when it went in to place? It should. Mine took a lot of force to get it fully on. I know some CP's use a larger than stock o-ring, not sure about yours as I have the ER. Best of luck.

SnapCoupe · 03-05-2018, 01:18 PM

Quote:

Originally Posted by JETmn

Did the clip give an audible snap when it went in to place? It should. Mine took a lot of force to get it fully on. I know some CP's use a larger than stock o-ring, not sure about yours as I have the ER. Best of luck.

Yeah, clip is locked in. The O-ring that I replaced with an OEM BMW O-ring was exactly the same size and it didn't look like a bigger one could be installed.

03-01-2018, 12:31 PM	#1
SnapCoupe BMW Portland 224 Rep 524 Posts Drives: Z4M Coupe/E90 335i Join Date: May 2015 Location: Portland, OR iTrader: (0)	What is an acceptable ammount of boost leak? After recently smoke testing my car to track down a boost leak on the intercooler hose clamps, I noticed that my BMS charge pipe has a small seep/leak from the motor side mount. I knew my car had a boost leak somewhere because I could hear a "squeal" coming from one of the silicone hoses under boost. Though, considering my charge pipe is metal I knew it wasn't originating from that. I replaced the gasket in between the CP and the motor and there is still a bit of smoke coming out. Is this something that will effect drivability/performance? __________________ 2011 335i N55/6MT/M-Sport MHD Stage 2+, VRSF Downpipe, VRSF 7" FMIC, BMS Intake, BMS Chargepipe, Performance Exhaust Mod, F10 550i Clutch, BMS CDV, BMW Performance SSK, M3 Control Arms, ST Coilovers, Apex ARC-8 wheels, Michelin PS4S
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03-02-2018, 10:50 AM	#2
JETmn Lieutenant Colonel 245 Rep 1,595 Posts Drives: 2011 335i xDrive Msport Join Date: Apr 2013 Location: Orlando iTrader: (0) Garage List 2011 335Xi [0.00]	It will cause you car to run rich, but it will not be consistent as the temperature changes. I would fix it. __________________ 2011 335Xi 6AT - VRSF catless DP - VRSF 7" FMIC with turbo inlet pipe - VRSF chargepipe - Pure Stage 1 turbo - JB4 - E30 - xHP Stage 3 - Strongflex tension bushings - Whiteline RSFB - UUC rear swaybar
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03-05-2018, 11:29 AM	#4
SnapCoupe BMW Portland 224 Rep 524 Posts Drives: Z4M Coupe/E90 335i Join Date: May 2015 Location: Portland, OR iTrader: (0)	Still trying to figure this out... Replacing the plugs and coils this weekend so I will have full access to mess about with the charge pipe. Is there anything to adjust to tighten up the charge pipe? I can move it around slightly, but given the BMS charge pipe doesn't bolt to the metal support for the factory charge pipe, is there any way to even remedy this? __________________ 2011 335i N55/6MT/M-Sport MHD Stage 2+, VRSF Downpipe, VRSF 7" FMIC, BMS Intake, BMS Chargepipe, Performance Exhaust Mod, F10 550i Clutch, BMS CDV, BMW Performance SSK, M3 Control Arms, ST Coilovers, Apex ARC-8 wheels, Michelin PS4S
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03-05-2018, 12:16 PM	#5
JETmn Lieutenant Colonel 245 Rep 1,595 Posts Drives: 2011 335i xDrive Msport Join Date: Apr 2013 Location: Orlando iTrader: (0) Garage List 2011 335Xi [0.00]	Did the clip give an audible snap when it went in to place? It should. Mine took a lot of force to get it fully on. I know some CP's use a larger than stock o-ring, not sure about yours as I have the ER. Best of luck. __________________ 2011 335Xi 6AT - VRSF catless DP - VRSF 7" FMIC with turbo inlet pipe - VRSF chargepipe - Pure Stage 1 turbo - JB4 - E30 - xHP Stage 3 - Strongflex tension bushings - Whiteline RSFB - UUC rear swaybar
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