BOV vs DVs

Which style of Charge Pipe are you running?

  • BOV

    Votes: 21 65.6%
  • DVs

    Votes: 11 34.4%

  • Total voters
    32

Hassans

Specialist
Jul 2, 2017
70
15
0
Ride
E90 LCI 335i N54
For those that have upgraded their CP, did you go with a BOV or DV style? What influenced your choice?
 

Hassans

Specialist
Jul 2, 2017
70
15
0
Ride
E90 LCI 335i N54
DV...because BOVs dump oily air into the engine bay. Is this true?

It's the same air that would create buildup on the back of your valves so I can only assume that to be true.
 

Hassans

Specialist
Jul 2, 2017
70
15
0
Ride
E90 LCI 335i N54
DVs for me because I prefer the subtlety of them as compared to a BOV.
 

Hassans

Specialist
Jul 2, 2017
70
15
0
Ride
E90 LCI 335i N54
Run high side and low side PCV systems. That oily air is still getting onto your valves no matter what CP system you choose to run with the stock PCV system.

Correct, looks like @Jeffman point maybe that he doesnt want an oily engine bay haha.

An OCC should help.

can you elaborate on high side and low side PCV?
 

08_335i

Sergeant
Nov 3, 2016
372
217
0
28
Ride
2008 ST 335i
Correct, looks like @Jeffman point maybe that he doesnt want an oily engine bay haha.

An OCC should help.

can you elaborate on high side and low side PCV?
There is two different angles of PCV on these motors. High side, and low side. High side is what you see at WOT pulls. Low side is what you see while driving around (So low side, is what you see most of the time while you're driving your car). Low side is the one that creates all that carbon back up on your valves. My low side can catches about the same amount of oil in 500 miles, that my high side catches in over 5k miles. This shows you the difference. Most people only run a high side PCV catch can (The BMS style can is the best suited for this). But if you really want to give your motor the healthiest solution and running ability, you need the low side system to. Rob Beck (RB) sells the low side system. Like I said, the best of both worlds is to run both a high side catch can, and low side catch can. Low side does require you to tap and plug the intake ports, unless you choose to run ADE's PCV adapter, then you can skip the ports if you so choose to.
 
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Hassans

Specialist
Jul 2, 2017
70
15
0
Ride
E90 LCI 335i N54
There is two different angles of PCV on these motors. High side, and low side. High side is what you see at WOT pulls. Low side is what you see while driving around (So low side, is what you see most of the time while you're driving your car). Low side is the one that creates all that carbon back up on your valves. My low side can catches about the same amount of oil in 500 miles, that my high side catches in over 5k miles. This shows you the difference. Most people only run a high side PCV catch can (The BMS style can is the best suited for this). But if you really want to give your motor the healthiest solution and running ability, you need the low side system to. Rob Beck (RB) sells the low side system. Like I said, the best of both worlds is to run both a high side catch can, and low side catch can. Low side does require you to tap and plug the intake ports, unless you choose to run ADE's PCV adapter, then you can skip the ports if you so choose to.

Thanks, that's good info.
 
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doublespaces

Administrator
Oct 18, 2016
9,052
4,158
0
AZ
Ride
2009 E93 335i
i have DV that dump into the bay and i dont have any oil in the bay.

I have a bov and don't have this problem either, I suppose its a matter of the oil 'vapor' building up that he is talking about perhaps. That and for those people with lots of oil built up in the FMIC, saw that one guy spew oil all over his engine bay after putting new turbos on.
 

08_335i

Sergeant
Nov 3, 2016
372
217
0
28
Ride
2008 ST 335i
I have a bov and don't have this problem either, I suppose its a matter of the oil 'vapor' building up that he is talking about perhaps. That and for those people with lots of oil built up in the FMIC, saw that one guy spew oil all over his engine bay after putting new turbos on.
I beleive it, it happened to me when I blew the seals out of my stock turbos. Whole bay was covered in oil. When I took my intercooler off, there was so much oil inside of it I wondered how my engine kept any :confused:
 

matreyia

Major
Apr 19, 2017
1,751
690
0
Ride
335i e93
I ran Forge DV Valves since 2014 and was OK...a little more response than stock and no choke ups when WOT tuned. However, I just switched to Tial BOV with the same brand ER chargepipe and I gotta tell ya...there is no comparison. Response is rock solid, very subtle noise, feels solid as a rock when WOT as opposed to the Forge DV set that was better than stock set. So in my experience, BOV is the better choice so far. Mind you, I would not have ever considered BOV over DV Valves because I like to keep things within original designed parameters of the factory...however, it was because of Forge's fault that I was forced to buy a new chargepipe and TIAL BOV. I tried to follow their maintenance recommendations and their website sucked, hard to find the model kit, and then, took over a month to get the parts, which were in the end incorrect...anyways, it feels as if the BOV has a much more air tight control over vacuum than the Forge DVs.

I went for the TIAL BOV because it was recommended with very low noise. I hate the juvenile swhoosh sound...to me, it immediately reeks of ghetto kids trying to act big. But to each his own I suppose.

I will order the correct maintenance kit and service the Forge set before I put the DV valves and the ER chargepipe up for sale together.
 
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mfractal

Specialist
Nov 10, 2017
77
26
0
Ride
E90 Sedan LCI 335i FBO MHD E40
Running Forge DVs. So far no complaints at all.
 

Rob09msport

Major
Oct 28, 2017
1,928
663
0
Monroe CT
Ride
09 335i msport le mans 18 x5
Tial with upgraded vac line before that had phoenix racing charge pipe with diverter valves I notice a huge part throttle difference for the better
 
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Jeffman

Captain
Jan 7, 2017
1,498
549
0
I’ve been running Forge DVs for five years. Orignally used yellow springs and then when I increased my boost to 23 psi on my stock turbos / N20
TMAP etc last summer I had to move up to the stiffer blue springs to prevent leaks. They’ve been working great.
 

titium

Private
Nov 8, 2016
48
9
0
Australia
There's less of a requirement for DVs to be closed at idle like bov do which means you can run a lighter spring making them more responsive.

I’ve been running Forge DVs for five years. Orignally used yellow springs and then when I increased my boost to 23 psi on my stock turbos / N20
TMAP etc last summer I had to move up to the stiffer blue springs to prevent leaks. They’ve been working great.

Spring strength is related to vacuum at idle not how much boost you're running.
 

Jeffman

Captain
Jan 7, 2017
1,498
549
0
You may be right. I’ll experiment with it some more once the weather warms up