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      04-13-2014, 12:53 PM   #23
banger714
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I only did front one since I couldn't find the one in the back.. I can barely notice the BOV sound probably bc of the BMW PE but its very subtle.. Maybe its bc i only had 1 done..

Ginger- Might need to meet you up for you to show me how to do the back one hahah
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      04-13-2014, 03:28 PM   #24
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Quote:
Originally Posted by banger714 View Post
I only did front one since I couldn't find the one in the back.. I can barely notice the BOV sound probably bc of the BMW PE but its very subtle.. Maybe its bc i only had 1 done..

Ginger- Might need to meet you up for you to show me how to do the back one hahah
There is a link at the beginning of this thread that shows where they are (not sure if you clicked that or not). I actually was confused by the picture at first until I realized I needed to remove the cowl piece to get to the back one, once you remove that piece its pretty easy to spot and complete the mod.
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      04-13-2014, 03:30 PM   #25
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Quote:
Originally Posted by banger714 View Post
I only did front one since I couldn't find the one in the back.. I can barely notice the BOV sound probably bc of the BMW PE but its very subtle.. Maybe its bc i only had 1 done..

Ginger- Might need to meet you up for you to show me how to do the back one hahah
Message me if you still need a hand.
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      04-13-2014, 03:30 PM   #26
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I love the sound now, I installed my BMS intake filters and did this mod yesterday, combined with the BMW PE, its audio bliss. Thanks for sharing
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      04-13-2014, 03:31 PM   #27
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Originally Posted by Helltime View Post
I just did this last night, went to Lowes bought the 7/8s plugs/caps. Came in a 4 pack. cost me more than $2 though! $2.42 after tax! I love it, not as loud as the video though. Quick question, I keep seeing pictures of the big plastic piece near the firewall gone and nobody mentions removing it in any of the DIYs I have seen, is that piece needed? (not the cabin filter piece, the big plastic piece below it).
None of it is truly necessary. However, if you live in a rainy climate, I would recommend keeping your cabin filters on.
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      04-13-2014, 03:58 PM   #28
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Quote:
Originally Posted by Helltime View Post
I love it, not as loud as the video though. Quick question, I keep seeing pictures of the big plastic piece near the firewall gone and nobody mentions removing it in any of the DIYs I have seen, is that piece needed? (not the cabin filter piece, the big plastic piece below it).
Not necessary. The large black piece of plastic (cowl) is what muffles the sound for you. Honestly I tried it both ways, and the 5-10lbs of weight reduction was not worth the really loud intake woosh I was getting (CP-e DCI). It got irritating hearing that all the time in heavy traffic, these DCI pull a lot of air really quickly and make a lot of noise if they aren't muffled by the cowl and cabin filter.

Try it both ways and see what you like better.

Another note is that the cowl and cabin filter are designed to promote proper airflow as it dams on the windshield at speed. It IS functional (if only slightly), and if you take it out the air swirls at the base of the windshield trapping heat in the engine bay and negatively affecting flow patterns over the front of the car as it creates a giant negative pressure spot right there. I've marked running cowl-less as a bad mod (in my book) for this reason. It's one of those small bits of engineering like the flaps in front of the wheels that while generally innocuous, are good to have.

That being said I plan on trying this BOV mod. For $2 and change, cant say no to that!
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Last edited by ShocknAwe; 04-13-2014 at 04:04 PM..
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      04-13-2014, 04:44 PM   #29
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Quote:
Originally Posted by ShocknAwe View Post

Another note is that the cowl and cabin filter are designed to promote proper airflow as it dams on the windshield at speed. It IS functional (if only slightly), and if you take it out the air swirls at the base of the windshield trapping heat in the engine bay and negatively affecting flow patterns over the front of the car as it creates a giant negative pressure spot right there. I've marked running cowl-less as a bad mod (in my book) for this reason. It's one of those small bits of engineering like the flaps in front of the wheels that while generally innocuous, are good to have.

That being said I plan on trying this BOV mod. For $2 and change, cant say no to that!
Can you elaborate on your testing procedures? I have only anecdotal evidence in regards to the cowl's effect on cooling. Without the cowl, the rear of the hood is now a large vent for heat to escape. When driving the car hard, without the cowl, you can see heat escaping the hood that it otherwise would not do with the cowl in tact.
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      04-13-2014, 06:22 PM   #30
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Really don't want to derail your thread man. But anyways.

Quote:
Originally Posted by Ginger_Extract View Post
Can you elaborate on your testing procedures? I have only anecdotal evidence in regards to the cowl's effect on cooling. Without the cowl, the rear of the hood is now a large vent for heat to escape. When driving the car hard, without the cowl, you can see heat escaping the hood that it otherwise would not do with the cowl in tact.
You would think so, definitely. Now, it's not concrete proof but I used JB4 logging (wish I had saved them, would have been some good evidence relevant to our platform) to check the IATs, and I also watched my oil temps and through the gauge. The temps were virtually identical, with the IAT actually sitting a little higher without the cowl than with it. My oil temps didn't change via the gauge, but, we both know that's not horribly accurate. I expect if I had had a way to measure oil and water temps accurately that they were both elevated as well. Our engines are cooled by the radiator and oil coolers, and if the pressure changes in the engine bay, airflow through those suckers gets all messed up. This all hampers performance.

Now the below links are talking primarily about hood risers, but deleting your cowl and cabin filter bracketing does exactly the same thing by opening up a large pathway into the engine bay from the wrong end.

Found it:
Thread on these forums about the cowl delete/Filters mod:
http://www.1addicts.com/forums/showthread.php?t=900940

Good post elsewhere:
http://www.importatlanta.com/forums/...-your-car.html

Good read, but unfortunately the pictures that do it justice for us laypersons are missing...
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Last edited by ShocknAwe; 04-13-2014 at 06:54 PM.. Reason: removed notes on other products as not to derail thread. Thanks for the mod idea Ginger!
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      04-17-2014, 08:32 AM   #31
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Ok so I was loving this BOV mod. I had my front hose unhooked and angled it up for best sound. Yesterday I checked and there is oil being sprayed on the bottom of the hood from the hose. It is not enough to matter on an oil level perspective, but its messy.

I hooked it back up the way its supposed to be now, but clearly blowby is an issue on this setup. Anyone got any ideas for some kind of filter that will let air out but not oil? The sound is amazing, but its not worth making a huge mess.


I was thinking something like a beather filter like this, but I have no idea what size or anything to use. I suck at custom fitting parts. But IMO this is 100% needed. After just a week I made a decent mess. So you'll be spraying out messy oil if you leave this wide open. Its gotta go somewhere.


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      04-17-2014, 09:42 AM   #32
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Quote:
Originally Posted by darkrom View Post
This is actually what I have been toying around with. It's pretty simple IMO to replicate the picture above. Stuff some tubing down the tract, and add a breather filter at the end.
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      04-17-2014, 02:04 PM   #33
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I'd do it but I always end up with the wrong size etc. If you end up doing it please post what you add. Really there was more oil spray than you'd think in a week. Very messy. I'd avoid running it without a filter. With a filter I'd switch back in a heartbeat.
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      04-17-2014, 11:10 PM   #34
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If someone figures out a filter system that works, post up.

I won't do it unless we can get that figured out. Don't want oil spraying all over my bay.
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      04-19-2014, 09:49 AM   #35
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Yeah it made a nasty mess. Need to get that filter figured out before this is worth doing.
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      04-19-2014, 10:08 PM   #36
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Will a breather muffle the sound to the point where the mod is even worth doing?
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      04-21-2014, 01:38 PM   #37
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Will a breather muffle the sound to the point where the mod is even worth doing?
I don't know but I don't think so. You could always drill small holes in the filter for more sound. They don't spray a ton of oil, I just need SOMETHING in place to contain it.
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      04-22-2014, 01:26 PM   #38
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Still gotta clean the oil out of my engine bay. This mod is no good without a filter IMO. Its a shame because it was fantastic sounding.
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      05-03-2014, 09:46 AM   #39
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Quote:
Originally Posted by darkrom View Post
Still gotta clean the oil out of my engine bay. This mod is no good without a filter IMO. Its a shame because it was fantastic sounding.
The real solution for us is a oil catch can, as this does point out the amount of blow-by people are getting. Imagine how much of that is being pushed back into the intake tract with the recircs equipped!
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      05-03-2014, 10:09 AM   #40
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Quote:
Originally Posted by Ginger_Extract View Post
The real solution for us is a oil catch can, as this does point out the amount of blow-by people are getting. Imagine how much of that is being pushed back into the intake tract with the recircs equipped!
Did you ever work out what size hosing and breather filters works?

Also, where do you get the parts? I already have the 7/8" caps, but sitting on hold with this until I can do it properly with the breather filters.
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      05-03-2014, 04:02 PM   #41
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I already have an oil catch can. Would I need the filters then?
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      05-03-2014, 04:52 PM   #42
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Quote:
Originally Posted by suspenceful View Post
I already have an oil catch can. Would I need the filters then?
If you need filters after a catch can, you've got bigger problems, my friend.
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      06-04-2014, 01:47 AM   #43
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Quote:
Originally Posted by Helltime View Post
I just did this last night, went to Lowes bought the 7/8s plugs/caps. Came in a 4 pack. cost me more than $2 though! $2.42 after tax! I love it, not as loud as the video though. Quick question, I keep seeing pictures of the big plastic piece near the firewall gone and nobody mentions removing it in any of the DIYs I have seen, is that piece needed? (not the cabin filter piece, the big plastic piece below it).
Im wondering the same thing, I got the front hose plugged (closest to the front bumper) but i cant get the back one even un hooked because of that piece in the way. How would I do that?
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      06-04-2014, 11:37 AM   #44
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I don't think a $2 mod is worth the extra enjoyment to the ears considering not everyone is agreeing that this is a completely safe mod.
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