cardriverx

iTrader: (12)

The stock BOV on the new GTI is electric, I found that out when installing a new BOV on my buddy's. Pretty nifty design, and I dident know they were electric.

y8s

iTrader: (8)

increase the diameter of the flow cross section = lower mach numbers = quieter

18psi

iTrader: (76)

is that you?

The_Pipefather

iTrader: (5)

yes, OR use a pre-compressor throttle body mounted like that:





Notice that this doesnt replace the actual throttle body which is still in the original location, but it closes in conjunction with it, thus removing any possibility of flutter. An e-BOV might be easier and simpler though.

patsmx5

iTrader: (16)

Yeah, I bet I could port on this BOV a bit and make it quieter. Pretty sure it's designed to be loud.

Vashthestampede

iTrader: (17)

GFB Electronic BOV

Super expensive though. They also have the Stealth which is basically the same, but without the electronics. I've read alot of great reviews about GFB online.

Vash-

nicacus

iTrader: (7)

mine is a GFB I love it.. it is super loud though

The_Pipefather

iTrader: (5)

hey pat, here's something for ya:

The All-Electronic Blow-Off Valve!

I also found a local supplier ;-) for the e-BOV @ $18.47 each:

Toro 1 In. In-Line Jar Top Valve with Flow Control (Slip) - 53707 at The Home Depot

The controller doesnt have to be so complex, just something that goes to ground at closed throttle since you don't run a MAF. Or even a vacuum switch if you want to get fancy.

9671111

iTrader: (10)

Probably also depends on the kind of foam you're using. The samekind principles for making a firearm silencer probably apply. Another material worth considering is steel wool.

patsmx5

iTrader: (16)

Well, I'm gonna do the intake next before I finish up the BOV. But I was figuring I'd wrap the BOV in another layer of foam, then wrap it in sheet metal and put a couple hose clamps. Might be too restrictive, but if so, I can make the steel band smaller. So we'll see. I'm not wanting to change BOV's right now. I can't while I'm at college.

m2cupcar

iTrader: (5)

I've read that even a long hose helps muffle the sound- and you can aim the exit. I haven't tried it yet... my eBay bov isn't that loud.

1slowna

iTrader: (1)

sexiest 1980s 1500hp 4cyl ever made if im not mistaken (which i prolly am)
bmw m12 engine?

The_Pipefather

iTrader: (5)

I believe its a BMW, yes.

Saml01

iTrader: (9)

I bet a tube sock would work great, just double it up.

m2cupcar

iTrader: (5)

I had a lawnmower foam air filter on mine. That cut noise down by half... There's k&n style breather filters on eBay that will fit most bovs.

Faeflora

iTrader: (2)

Did you use foam with a combustability rating? Wat if you backfire :( Some foam likes to burn.

patsmx5

iTrader: (16)

Good point. Never heard of that. Link? This is walmart special foam. I'm sure there's something better out there, but I wouldn't know what.

I put a small piece on my manifold and it smoldered to nothing.

Deatschwerks

APS makes a good Recirc.

99mx5

iTrader: (16)

Pat, I agree with you about the noise levels. After I installed a midpipe and header, my car was much louder than I wanted. Before, I could step on it and not get too much attention, but now I get unwanted attention. The added noise isn't worth the 4-6 WHP that is gained.

Faeflora

iTrader: (2)

Well if it just smolders it's probably flame retardant already. Why not hold a match to it? If it burns slowly it's the good stuff. If it goes WOOSHpoof then it's bad.

Here's a link to some foam:

Flame Retardant Foam