boost activated exhaust cutout coolness

**ThirdStrike** · 06-30-2010 11:51 AM

(mod) if this is a repost please delete the thread

http://www.youtube.com/watch?v=mvCl-v_AzLE

id like & i want!
discuss...

**boomerro** · 06-30-2010 12:17 PM

Originally Posted by ThirdStrike

(mod) if this is a repost please delete the thread

id like & i want!
discuss...

so its a wastegate after the turbo? LAWL fail.

this is retarded. if you want exhaust dumps on boost, get some external wastegates, and dont plum them back in.

**GarbatyA4** · 06-30-2010 12:20 PM

I think its used as if you were opening dumps proportional to your boost pressure.

i.e. not using electric motor. Cheaper alternative?

**boomerro** · 06-30-2010 12:22 PM

Originally Posted by GarbatyA4

I think its used as if you were opening dumps proportional to your boost pressure.

weld two wastegates to your downpipes and plum them with boost controlers in the car and you can adjust the boost they dump at from in the car then :P

**The_Jerbel** · 07-01-2010 10:57 AM

You're stilling running your internal WG's. This would be a separate air line running to the cutout. Not a bad idea.

**boomerro** · 07-01-2010 11:03 AM

Originally Posted by The_Jerbel

You're stilling running your internal WG's. This would be a separate air line running to the cutout. Not a bad idea.

yup thats what i was talking about. EXTRA wastegates welded to the downpipes. so you could dump before your muffler whenever you wanted :)

**Dimcorner** · 07-01-2010 11:06 AM

wonder if it can be modified to make it like an active exhaust damper (inline with exhaust)? Modify the arm so that it's about 60-70% open on normal driving, but full open on WOT.

**veggiemonster** · 07-01-2010 11:13 AM

Originally Posted by boomerro

so its a wastegate after the turbo? LAWL fail.

this is retarded. if you want exhaust dumps on boost, get some external wastegates, and dont plum them back in.

its a mechanical diaphragm...with linkage to a plate style valve... its not a wastegate.

the point of these is bc for those who live in te salt belt dont have to replace their expensive e-cutouts every year or 2.

i also garentee this is cheaper than what your talking about.

to the op Sound Performance is a great shop, i watched their 350z drag car in testing a couple years ago. fastest street car i've ever seen in person up top. (running 11's only fully boosting 4th to 5th)

**Dimcorner** · 07-01-2010 11:15 AM

Sooo yeah... at $350 buck a pop.... Pass..

**Das General** · 07-01-2010 11:18 AM

I know a big turbo A4 guy running one of these. His car sounds great. Quiet at idle but when he gets on it and needs the power, BAMMM.

**boomerro** · 07-01-2010 11:35 AM

Originally Posted by sdoherty_tjm

its a mechanical diaphragm...with linkage to a plate style valve... its not a wastegate.

i also garentee this is cheaper than what your talking about.

facepalm, do you not know what a wastegate is? a mechanical diaphram that is linked to a flap that dumps exhaust. (internal wastegate) this works exactly like a wastegate :P

you can get two cheap wastegates for under $350. granted, it wont bolt up if you have the flange for the e-cutouts already, so thats something to take into consideration.

what im talking about is using wastegate not as a wastegate, rather exactly what these do. Weld them to the downpipes and have them dump straight to the ground.

**infinkc** · 07-01-2010 11:39 AM

why not just go with electric dumps with a rpm activated or pressure switch, so you can have them open when you want or based on rpm/boost

**The_Jerbel** · 07-01-2010 11:40 AM

Boomerro,

You may have to use a really big WG to dump enough volume if you did it that way.

**boomerro** · 07-01-2010 11:43 AM

Originally Posted by The_Jerbel

Boomerro,

You may have to use a really big WG to dump enough volume if you did it that way.

so your doing this for flow? or sound? it will sound just as loud, but probably wont make as much power. i just thought you were all trying to make more noise :P but if you are doing this for power, you might as well do a straight pipe exhaust. :)

**veggiemonster** · 07-01-2010 11:47 AM

Originally Posted by boomerro

facepalm, do you not know what a wastegate is? a mechanical diaphram that is linked to a flap that dumps exhaust. (internal wastegate) this works exactly like a wastegate :P

wastegate. do you notice the difference? it obviously has to work/operate under the prinicpals of a wastgate cus thats where the idea came from. why do you think this is for sale if a regular wastegate worked???????

btw these used to be cheaper, not sure why theyre so expensive now...

**boomerro** · 07-01-2010 12:04 PM

Originally Posted by sdoherty_tjm

why do you think this is for sale if a regular wastegate worked???????

it works exactly the same as a wastegate, a wastegate would work fine for this

the same reason tuned ecu's are available for the s4's, because people who dont know any better will pay for them.

**Das General** · 07-01-2010 12:17 PM

Originally Posted by boomerro

so your doing this for flow? or sound? it will sound just as loud, but probably wont make as much power. i just thought you were all trying to make more noise :P but if you are doing this for power, you might as well do a straight pipe exhaust. :)

You don't read, do you? You can't have a docile car at idle and cruising with straight pipes. This is designed to allow your exhaust to be tame when you aren't in boost and to be aggressive and have more power when you are in boost. It is pretty straight forward, I don't see how you could miss that.

Good luck trying to weld two 44+ wg to your downpipes in the space of an audi S4.

**The_Jerbel** · 07-01-2010 12:17 PM

The idea behind a cutout is that these cars (especially those with K04 and bigger) make more power with a free-flowing exhaust. This is why people install 4" exhaust systems and 3" dp's on their cars. The point of a cutout is to have a civil sound when driving casually, and then free up the exhaust flow when you want maximum performance. The exhaust system sounds quiet and normal for daily driving, and then when you get into boost, the cutout opens and dumps all the pressure from exhaust gases out before the CB.

**boomerro** · 07-01-2010 12:30 PM

Originally Posted by The_Jerbel

The idea behind a cutout is that these cars (especially those with K04 and bigger) make more power with a free-flowing exhaust. This is why people install 4" exhaust systems and 3" dp's on their cars. The point of a cutout is to have a civil sound when driving casually, and then free up the exhaust flow when you want maximum performance. The exhaust system sounds quiet and normal for daily driving, and then when you get into boost, the cutout opens and dumps all the pressure from exhaust gases out before the CB.

if you are making over 550 whp and need more than a 4 inch exhaust, then yes this would be ok for it. anything under that would have very little use for these other than to be a ricer at full throttle :)

Originally Posted by Das General

You don't read, do you? You can't have a docile car at idle and cruising with straight pipes. This is designed to allow your exhaust to be tame when you aren't in boost and to be aggressive and have more power when you are in boost. It is pretty straight forward, I don't see how you could miss that.

Good luck trying to weld two 44+ wg to your downpipes in the space of an audi S4.

you dont have a straight pipe car do you? i live with straight pipes daily, and have no problems with it. Its docile as hell at idle and cruising, but roars like a mad beast on throttle. These cars are soo quiet that there is no need for mufflers on them.

**The_Jerbel** · 07-01-2010 12:41 PM

No. The idea is to run a more subdued exhaust system- 3" dp's, and say a Milltek 3" CB. Then run cutouts. For daily driving you have a very quiet, enjoyable car, then when you go WOT you have no exhaust back-pressure to get in the way.

**somebody5788** · 07-01-2010 12:46 PM

Originally Posted by boomerro

so your doing this for flow? or sound? it will sound just as loud, but probably wont make as much power. i just thought you were all trying to make more noise :P but if you are doing this for power, you might as well do a straight pipe exhaust. :)

Soooo loud.... This idea is awesome just because you can run stock or close to stock exhaust and keep the main cats with out sacrificing power at boost. Or at least a well flowing good sounding exhaust that is not too loud. That and it's probably emissions legal lol.

**GunSupplier** · 07-01-2010 12:48 PM

Originally Posted by boomerro

if you are making over 550 whp and need more than a 4 inch exhaust, then yes this would be ok for it. anything under that would have very little use for these other than to be a ricer at full throttle :)

Ricer? I know you're not being completely serious, but come on, running dumps on a turbo car in the name of maximum power is hardly "ricer".

Originally Posted by boomerro

i live with straight pipes daily, and have no problems with it. Its docile as hell at idle and cruising, but roars like a mad beast on throttle. These cars are soo quiet that there is no need for mufflers on them.

That's cool that you live with it with no problems, but it's still loud. Most people consider the Twin 1 to be quite loud, and that's not even straight pipes. Running straight pipes is not even a consideration for many people (including myself), as driving on the highway for any extended period of time with straight pipes would be awful. But I'm sure you'll reply saying that "it's not that bad." I have been in a car with the Twin 1 and that was loud enough.

**CruzS4** · 07-01-2010 01:09 PM

haha that guy walks in at the end like wtf is all that noise in here

**bw86** · 07-01-2010 01:16 PM

Originally Posted by boomerro

iyou dont have a straight pipe car do you? i live with straight pipes daily, and have no problems with it. Its docile as hell at idle and cruising, but roars like a mad beast on throttle. These cars are soo quiet that there is no need for mufflers on them.

what do you consider loud? My friend just put straight pipes on his s4 and its ridiculous how loud it is

**Das General** · 07-01-2010 02:13 PM

Originally Posted by boomerro

if you are making over 550 whp and need more than a 4 inch exhaust, then yes this would be ok for it. anything under that would have very little use for these other than to be a ricer at full throttle :)

you dont have a straight pipe car do you? i live with straight pipes daily, and have no problems with it. Its docile as hell at idle and cruising, but roars like a mad beast on throttle. These cars are soo quiet that there is no need for mufflers on them.

I was probably one of the first S4 owners with a legit straight pipe setup. With K04s and 3" downpipes it is louder than you think.

This was real quiet, lol

**ThirdStrike** · 07-01-2010 02:55 PM

boomero, what the fuck are you even talking about?
(maybe a little expensive but) this idea is cool. dont be mad you didnt figure it out first.

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