BOV

zvvbmw · 11-04-2010, 04:52 PM

Hello all.

I've been looking everywhere for videos, pics or comments regarding BOV for diesel beamers. Problem is i just can't find anything. I started thinking that BOV doesn't work for BMW with diesel engines. But in my city there is a GOLF 5 rollin' with a 2.0 diesel engine with BOV and it sounds epic.

It makes me wanna hit him...
I've got a 2.0d...nothing much, all stoc except i made a flash tuning and raised the power to 190hp. I love the BOV and I'm really up to installing one for my car. It's just that I CAN'T FIND any info about it on diesel beamers.

I also wanted to ask if there is a difference between diesel BOV and those on petrol engines ? Sound, the way it works, other issues...

I would be very grateful if someone could help me with some vids, pics, specs etc...Anything is welcomed.

Thank you.

...and sorry for my english if something is wrong

M3PGH · 11-04-2010, 06:23 PM

No need for a BOV on a naturally aspirated car......

coolchu001 · 11-04-2010, 08:38 PM

I think all BMW diesels are turbo charged...

Coolieman1220 · 11-04-2010, 11:18 PM

Quote:

Originally Posted by coolchu001

I think all BMW diesels are turbo charged...

most diesels if not all are turbo.

yeah how bout that BOV? and jake break too!

Brian_TII · 11-05-2010, 12:02 AM

Short story: BOV is useless / doesn't work on diesels... period.

Long story:
It comes down to the basic method in which a diesel works AND the problem that a BOV is meant solve. A diesel has no throttle body, all throttling is controlled by the amount of fuel injected into the engine. A blow off valve is designed to relieve pressure between the throttle body and the output side of the turbo compressor, thus eliminating the surge of back pressure on the compressor. This is desirable because the surge back at the compressor reduces turbo life as well as slows it down, resulting in longer spool up times after each shift (in a manual car). Most BOV's are designed actuate based off of vacuum off the back side of the throttle body (between the intake manifold and the throttle body), since if the engine is under vacuum the throttle body MUST be closed (or mostly closed).

With a diesel this system simply isn't needed. The engine has no throttle body, and has no vacuum to even actuate one if you were able to put it on there.

Edit to add... that VW might have an "electronic / fake" blow off valve... or maybe he seriously rigged something up to make it happen... but it would be a serious hack job, and probably not something you want to do to your car.

Here's the fake one - http://www.akamoto.co.uk/dump-valve.asp

11-04-2010, 04:52 PM	#1
zvvbmw Private 4 Rep 61 Posts Drives: e90 320d Join Date: Oct 2010 Location: romania, satu mare iTrader: (0)	BOV - Diesel Hello all. I've been looking everywhere for videos, pics or comments regarding BOV for diesel beamers. Problem is i just can't find anything. I started thinking that BOV doesn't work for BMW with diesel engines. But in my city there is a GOLF 5 rollin' with a 2.0 diesel engine with BOV and it sounds epic. It makes me wanna hit him... I've got a 2.0d...nothing much, all stoc except i made a flash tuning and raised the power to 190hp. I love the BOV and I'm really up to installing one for my car. It's just that I CAN'T FIND any info about it on diesel beamers. I also wanted to ask if there is a difference between diesel BOV and those on petrol engines ? Sound, the way it works, other issues... I would be very grateful if someone could help me with some vids, pics, specs etc...Anything is welcomed. Thank you. ...and sorry for my english if something is wrong
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11-04-2010, 06:23 PM	#2
M3PGH Major 812 Rep 1,402 Posts Drives: Too Many Join Date: Mar 2009 Location: Pittsburgh,PA iTrader: (1)	No need for a BOV on a naturally aspirated car......
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11-04-2010, 08:38 PM	#3
coolchu001 Lieutenant 48 Rep 583 Posts Drives: 09 BMW 335d Join Date: Aug 2009 Location: OH iTrader: (30)	I think all BMW diesels are turbo charged... __________________
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11-05-2010, 12:02 AM	#5
Brian_TII Second Lieutenant 8 Rep 229 Posts Drives: 06 e90 330i 6spd Join Date: Aug 2010 Location: Atlanta, GA iTrader: (0)	Short story: BOV is useless / doesn't work on diesels... period. Long story: It comes down to the basic method in which a diesel works AND the problem that a BOV is meant solve. A diesel has no throttle body, all throttling is controlled by the amount of fuel injected into the engine. A blow off valve is designed to relieve pressure between the throttle body and the output side of the turbo compressor, thus eliminating the surge of back pressure on the compressor. This is desirable because the surge back at the compressor reduces turbo life as well as slows it down, resulting in longer spool up times after each shift (in a manual car). Most BOV's are designed actuate based off of vacuum off the back side of the throttle body (between the intake manifold and the throttle body), since if the engine is under vacuum the throttle body MUST be closed (or mostly closed). With a diesel this system simply isn't needed. The engine has no throttle body, and has no vacuum to even actuate one if you were able to put it on there. Edit to add... that VW might have an "electronic / fake" blow off valve... or maybe he seriously rigged something up to make it happen... but it would be a serious hack job, and probably not something you want to do to your car. Here's the fake one - http://www.akamoto.co.uk/dump-valve.asp Last edited by Brian_TII; 11-05-2010 at 12:21 AM..
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