Airbox debaffle (inlet only) yay or nay?

**Synenergy52** · Mon, Mar-22-2010, 03:10:29 PM

This weekend, I de-baffled the inlet side of my airbox while replacing my CCV with a new Meyle unit and cleaning my ICV.

Process: On the inlet side of the airbox, there's a tube that is held on by a single clip inside the airbox. Pretty minimal effort required to pull it out

Impressions: I'm still not sure if I like it. It does sound kind of cool, but on the other hand it kind of sounds like my debaffled Hondas back in the day. Slightly ricey maybe? I'm not so sure. I notice the increase in sound mainly at WOT. 75% throttle or even 85% throttle you don't really notice it. As soon as the gas pedal is pinned, you hear a deep roar. Although AA says it's good for another 4hp/4tq, I don't feel it to be honest. Anyone debaffle and feel the same way I do? Kind of on the fence about the sound?

By the way after 125k on the original CCV, there was absolutely no sludge buildup in the CCV or associated plumbing.

Highneiken · Mon, Mar-22-2010, 03:56:19 PM

N00b question...what's ccv and icv??

hencini · Mon, Mar-22-2010, 04:12:29 PM

I didn't vote, because none of the options summed up how I feel.

IIRC, I saw a dyno on the interwebs once that actually showed a 2-3hp LOSS from the de-baffle. The hypothesis was something about more turbulent air robbing a small amount of power from the engine.

When I had mine dyno'd, I wanted to do one run with and one without the baffle to try and settle the debate about whether it added (or deleted) power-- the guy that owned the shop just laughed. He said that something like that would make no appreciable difference.

Personally, I don't like the sound with it removed-- I think it sounds more refined with the baffle in place and the exhaust note is more evident.

YMMV...

salty · Mon, Mar-22-2010, 04:15:00 PM

drive it for a few weeks then put it back in. I think you will notice crisper part throttle response with it stock.

**Synenergy52** · Mon, Mar-22-2010, 04:25:39 PM

Crankcase vent valve is for oil recirculation and idle control valve helps smooth out idle. both should be looked at and/or replaced/serviced periodically.

Quote:

Originally Posted by Highneiken

N00b question...what's ccv and icv??

Yeah I might be putting it back in. I do like the exhaust sound more (stock exhaust) haha

Quote:

Originally Posted by hencini

I didn't vote, because none of the options summed up how I feel.

IIRC, I saw a dyno on the interwebs once that actually showed a 2-3hp LOSS from the de-baffle. The hypothesis was something about more turbulent air robbing a small amount of power from the engine.

When I had mine dyno'd, I wanted to do one run with and one without the baffle to try and settle the debate about whether it added (or deleted) power-- the guy that owned the shop just laughed. He said that something like that would make no appreciable difference.

Personally, I don't like the sound with it removed-- I think it sounds more refined with the baffle in place and the exhaust note is more evident.

YMMV...

slickfast · Mon, Mar-22-2010, 04:32:45 PM

The dyno guy laughed at you because the variance in the dyno/engine runs are bigger than the apparent loss/gain in power. I took mine off... I love the way it sounds.

hencini · Mon, Mar-22-2010, 04:42:31 PM

Quote:

Originally Posted by slickfast

The dyno guy laughed at you because the variance in the dyno/engine runs are bigger than the apparent loss/gain in power.

This is also correct...

fiveightandten · Mon, Mar-22-2010, 05:36:02 PM

It sounds more throaty and louder overall. The snorkel makes just as much of a difference, if not more...though, i'd swear the butt dyno detected a slight decrease in power (could just be throttle response).

To me, the sound is worth whatever minimal amount of performance i'm loosing.

Here's thread with a vid, my car and Numik's car. Both have Supersprint catbacks. Mine has the snorkel and the baffle removed. His has the baffle removed.

http://www.m3forum.net/m3forum/showthread.php?t=308736

**epj3** · Mon, Mar-22-2010, 05:41:29 PM

Mine is not in there either.

**Synenergy52** · Mon, Mar-22-2010, 05:42:44 PM

What's the purpose of the snorkel removal? Is this the piece that sits directly behind the headlight? too bad i can't view youtube at work

View Poll Results: How do you like a de-baffled airbox?
Hell yeah! Sounds awesome.	5	45.45%
****-a-roni, the San Francisco Treat	5	45.45%
My stock airbox has a new home in the garage	1	9.09%
Voters: 11. You may not vote on this poll

Mon, Mar-22-2010, 03:10:29 PM	#1
Synenergy52 Banned Join Date: Apr 2009 Posts: 1,451 Reputation: 0 Location: Los Angeles	Airbox debaffle (inlet only) yay or nay? This weekend, I de-baffled the inlet side of my airbox while replacing my CCV with a new Meyle unit and cleaning my ICV. Process: On the inlet side of the airbox, there's a tube that is held on by a single clip inside the airbox. Pretty minimal effort required to pull it out Impressions: I'm still not sure if I like it. It does sound kind of cool, but on the other hand it kind of sounds like my debaffled Hondas back in the day. Slightly ricey maybe? I'm not so sure. I notice the increase in sound mainly at WOT. 75% throttle or even 85% throttle you don't really notice it. As soon as the gas pedal is pinned, you hear a deep roar. Although AA says it's good for another 4hp/4tq, I don't feel it to be honest. Anyone debaffle and feel the same way I do? Kind of on the fence about the sound? By the way after 125k on the original CCV, there was absolutely no sludge buildup in the CCV or associated plumbing.

Mon, Mar-22-2010, 03:56:19 PM	#2
Highneiken Registered User Join Date: Nov 2008 Posts: 65 Reputation: 0 Location: east elmhurst	N00b question...what's ccv and icv?? __________________ 04' infiniti I35 03' suzuki gsxr 02' volkswagen big turbo jetta and now my dreamcar..... my 96' m3

Mon, Mar-22-2010, 04:12:29 PM	#3
hencini Carlos is My Co-Pilot Join Date: Aug 2007 Posts: 4,502 Reputation: 0 Location: Near the Tannhäuser Gate	I didn't vote, because none of the options summed up how I feel. IIRC, I saw a dyno on the interwebs once that actually showed a 2-3hp LOSS from the de-baffle. The hypothesis was something about more turbulent air robbing a small amount of power from the engine. When I had mine dyno'd, I wanted to do one run with and one without the baffle to try and settle the debate about whether it added (or deleted) power-- the guy that owned the shop just laughed. He said that something like that would make no appreciable difference. Personally, I don't like the sound with it removed-- I think it sounds more refined with the baffle in place and the exhaust note is more evident. YMMV... __________________ 75 years and 350,000 miles of fun: 1998 M3/4/5 No mods, just maintenance 1983 CJ-7 No maintenance, just mods 1983 R65LS No intention of modding it, don't know how to maintain it

Mon, Mar-22-2010, 04:15:00 PM	#4
salty Registered User Join Date: Jan 2004 Posts: 5,319 Reputation: 0 Location: Toronto,Ontario	drive it for a few weeks then put it back in. I think you will notice crisper part throttle response with it stock. __________________ Bob S 98 M3/4/5 Cosmos, 2003 325 IT, 1999 10AE Miata, 1971, 2800 CS (In the Garage getting refreshed) 1966 Corvair 500/140, 1972 BMW 2002 Malaga.

Mon, Mar-22-2010, 04:32:45 PM	#6
slickfast Ginger engineer. Gingineer. Join Date: Jul 2008 Posts: 3,379 In the garage: '99 BMW M3 Reputation: 0 Location: suburbia	The dyno guy laughed at you because the variance in the dyno/engine runs are bigger than the apparent loss/gain in power. I took mine off... I love the way it sounds. __________________ SOLD. -Moe- 1999 M3 Coupe - Techno Violet / Dove - 77k miles - Summer Machine. DIY Guides: Door Handle Trim Replacement [Tumblog] [Twitter]

Mon, Mar-22-2010, 05:36:02 PM	#8
fiveightandten He'll save children, but not the British children... Join Date: Sep 2006 Posts: 7,705 In the garage: '03 BMW 330CI '02 SUBARU WRX '98 BMW M3 Reputation: 0 Location: Connecticut	It sounds more throaty and louder overall. The snorkel makes just as much of a difference, if not more...though, i'd swear the butt dyno detected a slight decrease in power (could just be throttle response). To me, the sound is worth whatever minimal amount of performance i'm loosing. Here's thread with a vid, my car and Numik's car. Both have Supersprint catbacks. Mine has the snorkel and the baffle removed. His has the baffle removed. http://www.m3forum.net/m3forum/showthread.php?t=308736 __________________ -Nick

Mon, Mar-22-2010, 05:41:29 PM	#9
epj3 Banned Join Date: Jun 2006 Age: 27 Posts: 6,860 Reputation: 0 Location: Where the air smelt of manure, PA	Mine is not in there either.

Mon, Mar-22-2010, 05:42:44 PM	#10
Synenergy52 Banned Join Date: Apr 2009 Posts: 1,451 Reputation: 0 Location: Los Angeles	What's the purpose of the snorkel removal? Is this the piece that sits directly behind the headlight? too bad i can't view youtube at work

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