Blow off sound ?

mackie · 03-18-2014, 09:54 PM

I own a 2008 335i, the only mod that I put in is a Jb4 G5 iso. It's been a month and no problem, still no problem but today I had window down and did couple of hard pull, noticed a blow off sound when I release gas but I don't put a blow off in it. I'm on map 5 and 94 octane. It was the first time that I have Windows down due to winter, is anything wrong ?

335NJ · 03-18-2014, 09:56 PM

Sounds normal to me

mike@x-ph.com · 03-18-2014, 11:00 PM

Quote:

Originally Posted by mackie

I own a 2008 335i, the only mod that I put in is a Jb4 G5 iso. It's been a month and no problem, still no problem but today I had window down and did couple of hard pull, noticed a blow off sound when I release gas but I don't put a blow off in it. I'm on map 5 and 94 octane. It was the first time that I have Windows down due to winter, is anything wrong ?

Post some logs

WNF_335i · 03-19-2014, 12:37 AM

Quote:

Originally Posted by mackie

I own a 2008 335i, the only mod that I put in is a Jb4 G5 iso. It's been a month and no problem, still no problem but today I had window down and did couple of hard pull, noticed a blow off sound when I release gas but I don't put a blow off in it. I'm on map 5 and 94 octane. It was the first time that I have Windows down due to winter, is anything wrong ?

its called a blow off valve (bov). What your hearing is a faint sound from the factory diverter valves kinda sounds like a bov faint but noticable. Just make sure there connected properly

other then that its normal

KMEninety335 · 03-19-2014, 08:47 AM

If you still have stock DVs it'll come from that since now you're running more boost and such. It's normal after a tune

mackie · 03-21-2014, 09:49 PM

Yup car is stock except JB4, will try to post datalog, still new with this little toy. Still be able to boost on 16-17 psi, so I don't think it's a boost leak.

03-18-2014, 09:54 PM	#1
mackie Private 7 Rep 51 Posts Drives: E92 335i Join Date: Jan 2014 Location: Canada iTrader: (0)	Blow off sound ? I own a 2008 335i, the only mod that I put in is a Jb4 G5 iso. It's been a month and no problem, still no problem but today I had window down and did couple of hard pull, noticed a blow off sound when I release gas but I don't put a blow off in it. I'm on map 5 and 94 octane. It was the first time that I have Windows down due to winter, is anything wrong ?
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03-18-2014, 09:56 PM	#2
335NJ Colonel 533 Rep 2,872 Posts Drives: 2008 335i 6MT E90 Join Date: Feb 2014 Location: NJ/Philadelphia Suburbs iTrader: (1)	Sounds normal to me __________________ *BSM E90 6MT*-JB4 G5 ISO-BMS DCI-Golf-Tee Mod-Hankook S1N2 Non-RFT-ER Chargepipe/TiAL BOV-E40 blend-VRSF V2's-M3 CDV-MHD/JB4 FLASH-VRSF 5" STEPPED FMIC
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03-19-2014, 08:47 AM	#5
KMEninety335 First Lieutenant 13 Rep 342 Posts Drives: E90 Monaco Blue 335i xdrive Join Date: May 2013 Location: Central NJ iTrader: (0) Garage List 2010 BMW 335i xdriv ... [10.00]	If you still have stock DVs it'll come from that since now you're running more boost and such. It's normal after a tune __________________ 2010 E90 335i xdrive \| Monaco Blue with Black Interior \| All Packages except Sport :/ \| Apex EC-7 \| Active Autowerke Strut Bar \| Roc Euro DCI \| Roc Euro Hyperboost DVs \| aFe Scoops \| BMW Performance Exhaust \| BMWCCA member
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03-21-2014, 09:49 PM	#6
mackie Private 7 Rep 51 Posts Drives: E92 335i Join Date: Jan 2014 Location: Canada iTrader: (0)	Yup car is stock except JB4, will try to post datalog, still new with this little toy. Still be able to boost on 16-17 psi, so I don't think it's a boost leak.
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