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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Blow Off Valve (BOV) on a 335i Coupe



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      08-22-2006, 09:47 PM   #1
SnG
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Blow Off Valve (BOV) on a 335i Coupe

This is a NewB question, can we add a Blow Off Valve to the turbo on the 335i? or would it be a waste?
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      08-22-2006, 10:47 PM   #2
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please don't attempt to do that, save your $$ for some 24's
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      08-22-2006, 10:49 PM   #3
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lol
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      08-22-2006, 10:58 PM   #4
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No, MAF based cars generally dont take well to blow-off valves.

Noone even has the car yet, lets take this one step at a time.
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      08-23-2006, 01:06 AM   #5
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haha i asked this here too... on my post http://e90post.com/forums/showthread...&highlight=bov

i got a little more positive response but .... i think it will mess up the engine in the long run.. which would be all bad... but im pretty sure someone else will try it first... if it works then ill probably put one in too.

otherwise you can always get this http://www.takakaira.co.jp/accessori...ightpager.html

hahaha
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      08-23-2006, 03:30 AM   #6
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Blow off would sound cool, but hurt performance. There's a reason BMW didn't put one in at the factory.
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      08-23-2006, 08:05 AM   #7
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what was it that they put into the Audi turbos.. Diverter valves?
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      08-23-2006, 08:11 AM   #8
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Quote:
Originally Posted by sillygoat
otherwise you can always get this http://www.takakaira.co.jp/accessori...ightpager.html

hahaha
That's so funny. Those guys think of everything.
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      08-23-2006, 08:20 AM   #9
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Quote:
Originally Posted by ksfrogman
otherwise you can always get this http://www.takakaira.co.jp/accessori...ightpager.html

hahaha
That's so funny. Those guys think of everything.[/quote]


I need to install that on my 72' 2002
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      08-23-2006, 11:26 PM   #10
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I believe Audi veh's use bypass valves (or diverter) which, instead of blowing off boost pressure to atmosphere, it just dumps it back in front of the turbo, allowing it to get reused.

Matt
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      08-23-2006, 11:26 PM   #11
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PS...
I think this IS what BMW's using.

Matt
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      08-24-2006, 11:01 AM   #12
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audi and vw aftermarket started using HYBRID bpv/bov so you get the noise like all the hot rodding evo's and STi's.

i think it's annoying after awhile, heck if you put an intake on the 335 you'll be able to hear the bpv "sneeze" when you let off throttle.
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      09-13-2006, 01:16 AM   #13
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It is going to be really funny when everyone has a bov on their 335. I am sure that all of the evo drivers will be pretty confused for a minute or two. lol
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      09-13-2006, 10:55 AM   #14
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the blow offs on the subarus sound like shit.
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      09-13-2006, 11:25 AM   #15
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FWIW, the 335i doesn't have a MAF senor. It uses MAP sensors instead. One in the intake manifold and one just before the throttle body in the IC charge pipe.

-shiv
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      09-20-2006, 09:14 AM   #16
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Quote:
Originally Posted by 06330i
the blow offs on the subarus sound like shit.
lolol...no way dude!! your just mad cause thats all you hear as your trying to focus on there tailights!
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      09-20-2006, 09:32 AM   #17
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Quote:
Originally Posted by shiv@vishnu
FWIW, the 335i doesn't have a MAF senor. It uses MAP sensors instead. One in the intake manifold and one just before the throttle body in the IC charge pipe.

-shiv
Yeah, I saw that in your recent post.. probably the first BMW to ever use a MAP! (then again, not sure what they use on the diesels)
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      09-20-2006, 02:09 PM   #18
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yup, if it uses maf sensors, it will basically expect air to get back into the intake from a dv. However, a BOV is atmospheric so thus no air goes back into the intake causing a loss of power because the engine expected more air than what is really there. With a MAP, you can run a BOV safely and what not. The hybrid ones you mention is both recirc and atomospheric. Until high loads (more PSI) it shoots into atmos and under low load, it shoots into the intake. Btw, what you said about the STi BOV sounding like shit is all subjective. It's the brand of the BOV that makes the unique sound not the car.
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      09-24-2006, 05:19 PM   #19
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Quote:
Originally Posted by jasonn
BOV is atmospheric so thus no air goes back into the intake causing a loss of power because the engine expected more air than what is really there
I had Blitz dual stage 100% atmospheric BOV on my track toy before that I made recirculate it back into the stock recirc opening on the intake. Simple adapter and tubing. Sound was nice and sublte.

Used a MAF sensor and had no problems whatsoever, no stalling, rough idling, no afterburn / backfire between shifts, etc.

I would be suprised if the 335i doesnt have some sort of turbo protection for surges. But then again its wastegate is unlike what i've seen before - perhaps it accomplishes that in itself.
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      11-14-2006, 03:09 AM   #20
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Quote:
Originally Posted by sillygoat

otherwise you can always get this http://www.takakaira.co.jp/accessori...ightpager.html

hahaha
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