BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

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      07-25-2007, 04:51 AM   #1
Chris Ruck
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Anyone Considering A Blowoff Valve for their 135i?

I will have a blowoff valve installed on my 135i. Just curious as to if anyone else will do the same?

Here a video with sound of a 335i with a blowoff valve.

CLICK HERE FOR THE VIDEO...

-Chris
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      07-25-2007, 06:19 AM   #2
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      07-25-2007, 06:31 AM   #3
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i'd stick it at the bottom of my list of things to do to my 135i .. but i don't see why not more "ooh's & ahhh's" then functionality in my book.
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      07-25-2007, 11:33 AM   #4
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I get annoyed quite easily. As long as its not too obnoxious I'd consider one.
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      07-25-2007, 12:20 PM   #5
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The BMW manuals I have seen call the stock valves Blow-off, but arent they really diverter valves? Unless I completely misinterpreted the diagram, the valves redirect the air back into the intake. If you put a blow off valve on a car that is made for a diverter valve it can really affect the way the car runs.
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      07-25-2007, 01:51 PM   #6
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You have got to be kidding me? BOVs are by far the most annoying modification you can make for your car. Live it for the ricers.
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      07-25-2007, 02:08 PM   #7
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I believe these cars have diverter valves. If that is the case, a BOV would be a bad investment for this car. Considering the 335i has already have fueling issues.
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      07-25-2007, 03:55 PM   #8
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You may find the need to replace the stock DV. The Bosch DV on VW/Audi 1.8T's had a high failure rate. I'm sure there will be some nice replacements available from Forge or Bailey.
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      07-25-2007, 04:01 PM   #9
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Quote:
Originally Posted by RUFASTR View Post
You may find the need to replace the stock DV. The Bosch DV on VW/Audi 1.8T's had a high failure rate. I'm sure there will be some nice replacements available from Forge or Bailey.
Yes, Im sure the BMW DV is much better since it has had more time to research. Forge does make pretty good equipment. It is not healthy to run a BOV on cars that have a DV before the MAF. If the MAF is before the DV then your in good shape, because air/fuel will be read then bleed off or diverted back to the IM. With a BOV before the MAF, all of the charged air with fuel will be blown out of the system forcing the car to change its air fuel mix. God only knows how sensitive these bimmers are, they will probably throw a code, if not youre still going to mess with the fuel mix.
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      07-25-2007, 04:05 PM   #10
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Quote:
Originally Posted by Won35i View Post
Yes, Im sure the BMW DV is much better since it has had more time to research. Forge does make pretty good equipment. It is not healthy to run a BOV on cars that have a DV before the MAF. If the MAF is before the DV then your in good shape, because air/fuel will be read then bleed off or diverted back to the IM. With a BOV before the MAF, all of the charged air with fuel will be blown out of the system forcing the car to change its air fuel mix. God only knows how sensitive these bimmers are, they will probably throw a code, if not youre still going to mess with the fuel mix.
It's amazing the stuff that you learn on this forum.
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      07-25-2007, 04:08 PM   #11
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Keep in mind that the N54 uses direct injection - so no fuel upstream of the cylinder head. : -)
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      07-25-2007, 04:09 PM   #12
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Quote:
Originally Posted by ibeam81 View Post
It's amazing the stuff that you learn on this forum.
sarcasm?:iono:
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      07-25-2007, 04:10 PM   #13
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Quote:
Originally Posted by atr_hugo View Post
Keep in mind that the N54 uses direct injection - so no fuel upstream of the cylinder head. : -)
So theres no residual?? Why does those the 335i have a DV then?
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      07-25-2007, 04:13 PM   #14
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Quote:
Originally Posted by Won35i View Post
sarcasm?:iono:
Nope... It really is pretty amazing. I guess that I should have put a thumb's up. Here you go.
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      07-25-2007, 04:16 PM   #15
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Quote:
Originally Posted by ibeam81 View Post
Nope... It really is pretty amazing. I guess that I should have put a thumb's up. Here you go.
Ok, thanks.

I understand the whole Direct Injection, but what I dont understand is how zero mixed air makes it into the intake manifold. that would mean theres no need for a MAF or DV if all the fuel stays and is burned in the cylinder.
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      07-25-2007, 04:18 PM   #16
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HKS

This HKS sounds awesome.. Ricer or not.. Do what YOU like. Be 1ndividual!

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      07-25-2007, 04:21 PM   #17
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Quote:
Originally Posted by Pocket_Rocket View Post
This HKS sounds awesome.. Ricer or not.. Do what YOU like. Be 1ndividual!

<object width="425" height="350"><param name="movie" value="<A href="http://www.youtube.com/v/ufT4rKvrhfw"></param><param">http://www.youtube.com/v/ufT4rKvrhfw"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/ufT4rKvrhfw" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350"></embed></object>
What do people not understand about MAFs???
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      07-25-2007, 04:28 PM   #18
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You still need a Mass Airflow Sensor but normally with a turbo the fuel is injected before the intake valves (hell, in my old Mustang the turbo sucked fuel and air from the carb - and in the old Maserati Biturbos they had pressurized carbs (those cars caught on fire frequently due to improper sealing of the plenum ; -)). With direct injection there is no fuel at any point before the cylinder head - just air.
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      07-25-2007, 04:59 PM   #19
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Quote:
Originally Posted by atr_hugo View Post
and in the old Maserati Biturbos they had pressurized carbs (those cars caught on fire frequently due to improper sealing of the plenum ; -)).
Wow.. Somebody else remembers that, too. They were fun cars though if you could put up with the possible fire issue.

R&T did a great comparison of the 325e and Biturbo in '84. The fire issue is one of the reasons that I chose a 325e.
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      07-25-2007, 05:09 PM   #20
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Quote:
Originally Posted by Won35i View Post
What do people not understand about MAFs???
Plenty of 335s running around with a BOV and running fine.
If you do not want to put one on yours then don't.. :iono:
Preach all you want.. people will do what they want.
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      07-25-2007, 05:15 PM   #21
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Quote:
Originally Posted by Pocket_Rocket View Post
people will do what they want.
Isn't that part of the definition of an American, although I'm sure that it's not unique to the US. It's probably a very "Human Thing". :tongue:
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      07-25-2007, 05:15 PM   #22
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Quote:
Originally Posted by Won35i View Post
Yes, Im sure the BMW DV is much better since it has had more time to research. Forge does make pretty good equipment. It is not healthy to run a BOV on cars that have a DV before the MAF. If the MAF is before the DV then your in good shape, because air/fuel will be read then bleed off or diverted back to the IM. With a BOV before the MAF, all of the charged air with fuel will be blown out of the system forcing the car to change its air fuel mix. God only knows how sensitive these bimmers are, they will probably throw a code, if not youre still going to mess with the fuel mix.
I think you may have this backwards. If the stock diverter valve recirculates air back between the MAF sensor and the turbo (DV After the MAF) you should not use a Blow off valve. This is because you are releasing pre-metered air and will cause your engine to run rich.
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