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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 > Blow off valve for n55?



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      10-27-2010, 02:35 PM   #1
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Blow off valve for n55?

anyone know if there are any blow off valves for the n55 yet?
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      10-27-2010, 02:52 PM   #2
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There won't be one anytime soon. The Diverter valve is an electronic valve that is built into the engine, unlike the N54 which had an external spring driven valve... It won't be as easy (or cheap) to make a DV or Blow off valve for the N55...
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      10-27-2010, 03:28 PM   #3
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Would a BOV even be a good idea for the N55 because of the stock single turbo? Someone please enlighten me on this.
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      10-30-2010, 04:25 PM   #4
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anyone hear of any manufacturers trying to produce a bov for the n55 yet?
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      10-30-2010, 11:53 PM   #5
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And I quote from the N55 manual:
Diverter valve
"...The number of components has been greatly reduced by positioning the diverter valve on the turbocharger compressor housing."

The Only way you are going to have a replacement DV or BOV is if someone is willing to redesign the entire turbocharger compressor housing. THIS is nothing like the N54 where you could simply replace the stock DV's with a BOV or FORGE's DV's... BOV's and DV's run you about $300-$500, something of this magnitude would run you upwards of $1000 or more (from the manual, the whole housing and turbo would need to be replaced, just for the BOV effect)... But maybe an expert can chime in on this...
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      10-31-2010, 12:21 AM   #6
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Not only because the diverter valve is on the turbo but it is now a MAF car, which means it will run like crap if you install an open atmosphere bov.
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      10-31-2010, 02:38 AM   #7
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Are you going for the sound? It's already there. Turn off your music and get on boost, you'll hear the hiss.
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      10-31-2010, 10:43 AM   #8
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The DV is louder on the N55 anyway, it's cool without being obvious
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      11-01-2010, 12:52 PM   #9
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Quote:
Originally Posted by dicker View Post
The DV is louder on the N55 anyway, it's cool without being obvious
+1.. I can hear it on mine all the time when I turn the music off...
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      11-01-2010, 02:55 PM   #10
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same here i hear it too..but kinda wanted a BOV =/
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      11-01-2010, 03:10 PM   #11
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yup not gonna happen yet. The diverter is real similar to an audi or a 997TT diverter but those are vacuum operated whereas ours are electronic.
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      11-01-2010, 03:58 PM   #12
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Quote:
Originally Posted by TMR View Post
Not only because the diverter valve is on the turbo but it is now a MAF car, which means it will run like crap if you install an open atmosphere bov.
+1. This is really the main reason IMO. Once you have to start fooling around with this type of stuff, then the justification for putting a bov is gone. You've spent more money on a nearly unfunctional modification than its really worth. I had a BOV but my car is MAP. Once you eject that metered air out into the atmosphere, you're car will run real rich and stumble.
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      10-30-2013, 03:31 PM   #13
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Good information!
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      10-30-2013, 05:26 PM   #14
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Wow old thread bump! With the upcoming turbo upgrades that will change. Vargas hybrid has custom forge BOV
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      11-05-2013, 12:04 PM   #15
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I don't think it's worth even seeking one with some boost it sounds great to me.. open your window lol even under stock boost
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      09-06-2014, 09:55 PM   #16
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Sorry to bump a old post but I came across this...

http://m.ebay.com/itm/190900700142?cmd=VIDESC&gxo=true


Is the n55 part of there listing a mistake or is this something that we could use?
I read a few n55 bov threads and because of the position of the maf sensor a bov seamed pointless.
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      09-09-2014, 06:47 PM   #17
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please god...no...
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      09-09-2014, 07:00 PM   #18
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Just get a BMS intake...you drown out any Subie and Civic within a one mile radius with that turbo spool.....*Whooosh!!!*
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      09-10-2014, 04:52 PM   #19
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Quote:
Originally Posted by Walker16 View Post
Sorry to bump a old post but I came across this...

http://m.ebay.com/itm/190900700142?cmd=VIDESC&gxo=true


Is the n55 part of there listing a mistake or is this something that we could use?
I read a few n55 bov threads and because of the position of the maf sensor a bov seamed pointless.
Find where that will go on your car and i will buy it for you.
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