DV Sounds - Stock vs Chipped vs Forge DV

[DownUnderSLine]

I recently fitted my Carbonio CAI to my otherwise stock B7 2.0T. (we all know people's thoughts on these, I got it used/cheap so please, no hate posts here.... )

The induction noise is ok (and what I expected) but I've got to say that the stock DV sound is both pathetic and very annoying

Firstly, I'm getting old and I don't like obnoxiously loud cars any more....

I don't mind the induction and DV noises when it's Wide Open Throttle time, but the stock DV sound is painfully annoying as it vents EVERYTIME from as little as 1500rpm and 10% throttle...

I actually find it embarrassing... It sounds like one of those fake electronic BOVs for naturally aspirated cars !

A couple of questions before I ditch the Carbonio and go back to the stock air box,

1 - I'm looking to get APR 93 flash in the next couple of weeks. Will the Stock DV sound different ? (ie, will increased boost levels make it sound louder / longer ??)

2 - I'll fit a Forge DV (when needed) at a later date. How does the sound of the Forge DV (without spacers, atmo vent etc) compare to the stock DV sound. Does it sound like a normal turbo car should ? Does it vent as frequently and as low in the rev range as the stock system ?

[kurupt_hawaiian]

I'll take the carbonio off your hands if you dont want it!

[CZA420tAvant]

I'll take the carbonio off your hands if you dont want it!

hahaha, jumping on that quick

I am sure the forged will be a bit more noticable but not sure if its more "rice" sounding.

[Glassnpowder98]

I personally do not know how the stock diverter valve sounds with Carbonio intake as I had my intake and Forge DV installed at the same time about a week after I got Revo chipped. Honestly, the Forge DV doesn't make too much noise unless you're under heavy boost. It is pretty easy to shift through the gears without getting any noise from the DV. Having a boost gauge also helps... When I'm not driving with spirit, I usually try to keep my boost gauge below 0 Hg to save some gas and wear on my turbo. Doing this produces no sound from my Forge DV as well. Furthermore, it doesn't seem like the DV is as loud when you are shifting in high RPMs as when you give it full throttle to mid RPMs and then let off. However, I'm pretty sure this is due to the increased boost and turbo spooling in lower RPMs as compared to the turbo starting to loose boost with higher RPMs.

[vtracer20]

stock airbox + Giac chip + forge DV = stockish sound....

i think there is a video of a forge dv with carbonio intake on youtube...just search.....

[Six Speed Turbo]

If you chip your car, you are going to notice the DV more often, yes it will be louder. More boost equals more recirculated air which equal more noise. If you don't like noise either don't chip the car or put the stock air box back on.

The Forge and stock DV are roughly equal in sound once chipped and in stock mode. With a chip however you will get a more beefy "blow off" sound. I personally like my setup, but everyone is different. Hope this helps in any way. Good luck.

[Slo.Mo.Shun.]

It gets really loud with software, but the forge DV sounds completely different.

This here was with my stock DV ( you can hear the induction sound like crazy )
http://youtube.com/watch?v=U5hy0_HbzrQ

[DownUnderSLine]

This here was with my stock DV ( you can hear the induction sound like crazy )
http://youtube.com/watch?v=U5hy0_HbzrQ

Thanks for the clip ! Yeah - induction sounds just like mine...

Perfect example of what bugs me is at 18secs of your clip. DV vents at like 1mph while reversing 5yards It sounds like you just ran over a nail...

[Entropy333]

I think unfortunately you are running into an issue that is signature of turbo cars/trucks. I think of all my diesel burning buddies and how they would put intakes on there pickup's....now that was loud turbo noise.

Pretty much no matter what you do, once you put on an intake your going to hear the turbo more...period. Put the stocker back on if it really bothers you.

Good Luck..

~James

[DownUnderSLine]

Thanks for the replies so far. In the past, I've played with a number of types of BOVs on my previous car (Subaru WRX).

What I found was that most of the Jap style BOVs that sounded 'really impressive' actually didn't work that well towards improving turbo response on the up shifts. (ie. maintaining turbine rpm). Many of them had tiny vent ports that made a very loud and prolonged noise - effectively more of an attention seeker mod than a performance mod.

The BOVs I tried that actually improved the turbo response had much larger vent ports and were in fact quieter and not as high pitched. (louder than stock but a nicer sound)

I've not seen a Forge DV first hand but being a spring and piston design, I would expect the ports to be larger than stock and therefore vent the intake charge faster ? (respective to OEM at the same boost level)...

Also, does the vaccum operation of the Forge DV cause it to vent as frequently as the OEM DV system ?

[b6onboost]

This is really a personal preference issue. When you put an intake on a turbo car you are expecting to hear more induction noise, turbo spool, and DV noise than OEM. Much moreso when you increase the boost. Changing the DV won't really make the sound change much, and the Forge will still release boost pressure at low rpms if you began building boost. It is meant to function identical to stock, just have the ability to hold higher pressures. If you are annoyed by the sound put the stock box back on and sell the carbonio.

[Zebman]

I've not seen a Forge DV first hand but being a spring and piston design, I would expect the ports to be larger than stock and therefore vent the intake charge faster ? (respective to OEM at the same boost level)...

Also, does the vaccum operation of the Forge DV cause it to vent as frequently as the OEM DV system ?

The vacuum operation of the Forge DV actually causes it to open slower, by .03 seconds. Not really significant, but has been proved in multiple logs from multiple people from vortex that that small amount of time will cause a slight compression surge. Being that the majority of turbo cars from the past had vacuum-actuated valves, I think it would be all right, but it won't increase performance, it just won't break, and with the stock valves being under warranty, I chose to just save my $225 and not buy the Forge valve.

The valves will open at the same time. It's just the nature of our small turbo that generates boost at very low rpms.

[tre]

I get the impression that AWE is coming out with their own DV for their BT kit. You may want to wait and pick up the AWE DV as it may be better then the forge DV.

[Zonacat]

How do you know if you blow your DV without a boost gauge, and without taking it apart.

[vtracer20]

^power loss.

I'm putting on my stock airbox back on too, seems with my cone filter my idle is a little weird. Probably just get a K&N or equivalent filter for the stock box.

[bcramer]

I recently fitted my Carbonio CAI to my otherwise stock B7 2.0T. (we all know people's thoughts on these, I got it used/cheap so please, no hate posts here.... )

Care to explain what you mean by that? My understanding is that the Carbonio CAI is the most popular choice for CAI on this forum.

[edkwok]

I never can hear my Forge DV, since my exhaust's sound is much louder. =Þ

[Alkemix]

Care to explain what you mean by that? My understanding is that the Carbonio CAI is the most popular choice for CAI on this forum.

He means how the carbonio, for our cars, are an overpriced noise maker, since the stock airbox is actually proven to bring more cool air in and is equal in efficiency. Most of the intakes for our cars are pretty useless until you get to a stage 2+ level (i think).

[bcramer]

He means how the carbonio, for our cars, are an overpriced noise maker, since the stock airbox is actually proven to bring more cool air in and is equal in efficiency. Most of the intakes for our cars are pretty useless until you get to a stage 2+ level (i think).

Thanks, I definitely didn't know that. Now I know I won't waste my money on one when I get my car...