before
Let me know what you think.
Thanks in advance
Plus I have a dump valve I would like to put in somewhere aswell.
Any suggestions would be great.
Here's a photo shopped picture with a few other things shaved off:
before
Let me know what you think.
Thanks in advance
Modified by Suave_ at 11:53 PM 5-28-2009
Modified by Suave_ at 11:53 PM 5-28-2009
Modified by Suave_ at 11:55 PM 5-28-2009
Post Title: Re: Dual exhaust on VR6 Jetta (Suave_)
Posted by: Andras.R at 3:08 AM 5-29-2009
Some company used to make this piece too, Andyman had one on his old Jetta. Jetex maybe?
Post Title: Re: Dual exhaust on VR6 Jetta (vitos97GT)
Posted by: allen! at 11:45 AM 5-29-2009
To be honest, I son't really see what's to be gained from doing dual outlet, I think that there are places to better spend the time/money. These cars are plenty loud with no suitcase.
Post Title:
Posted by: MasterAres at 11:49 AM 5-29-2009
Post Title: Re: Dual exhaust on VR6 Jetta (VW Acolyte)
Posted by: Suave_ at 12:30 PM 5-29-2009
| Quote, originally posted by VW Acolyte » |
| i think your best bet would be to get a duel outlet muffler then do what you were saying. just one one outlet to one side and the other to the other side. it would be kinda dumb to make a single out let muffle have duel tips. |
| Quote, originally posted by allen! » |
| Don't do a dump unless you go VRT. |
| Quote, originally posted by Suave_ » |
But wouldn't a dual outlet muffler give me less power because there is less back pressure? |
you should be shooting for no back pressure, needing back pressure is a myth. im not going to explain all of it, but i will tell you that you dont want back pressure
Post Title: Re: Dual exhaust on VR6 Jetta (Ex-ricer01)
Posted by: Suave_ at 12:56 PM 5-29-2009
| Quote, originally posted by Ex-ricer01 » |
|
midrange (which is good for a daily) 2.5
and topend (track car) 3in or more
back pressure will not create power or torque, exhaust flow velocity will. the faster you can move the exhaust away, the better. but you also have to be capable of moving lots it.
back pressure is a gasses own resistence to itself
Post Title: Re: (Ex-ricer01)
Posted by: allen! at 1:25 PM 5-29-2009
Post Title:
Posted by: Ex-ricer01 at 1:39 PM 5-29-2009
i think he's looking at it cosmetically(sp?)
Post Title: Re: (Ex-ricer01)
Posted by: n0rdicalex. at 3:30 PM 5-29-2009
the magnaflow 2.25" system made more power than all the 2.5" systems. also, for forced induction systems, stick to a 3" system.
so your thinking on bigger exhaust is better is, well, wrong.
http://forums.vwvortex.com/zerothread?id=1693237
Post Title: Re: (Ex-ricer01)
Posted by: Suave_ at 3:31 PM 5-29-2009
| Quote, originally posted by n0rdicalex. » |
so your thinking on bigger exhaust is better is, well, wrong. |
if you were talking about what i said. i never said bigger exhaust was better. just generalizing what size pipe one might want depending on the cars application. and i believe that test was using mk4 12v's. were they stock besides the exhaust or no? other modifications also tweak the performance of exhaust.
Post Title: Re: (Ex-ricer01)
Posted by: theinfamous at 5:24 PM 5-29-2009
| Quote, originally posted by Ex-ricer01 » |
if you were talking about what i said. i never said bigger exhaust was better. just generalizing what size pipe one might want depending on the cars application. and i believe that test was using mk4 12v's. were they stock besides the exhaust or no? other modifications also tweak the performance of exhaust. |
From what I understand about exhaust systems and backpressure, there is a certain phenomena called exhaust scavenging. Basically what this means is the exhaust gases "pull" exhaust from the motor with proper backpressure, pipe length, and diameter. Properly sized exhaust systems will cause a rise in efficiency and power.
If you use a bigger than necessary pipe on a normally aspirated car, it will cause the car to lose power. Also, have you ever tried driving a car with the exhaust venting right behind the cat? It is a noticeable loss of power, and that is a system with little to no backpressure.
Forced induction is a completely different ballgame, since the turbo needs to basically push the exhaust gases out of the car, (therefore backpressure is not a good thing) while generating power from them. In this case, the largest exhaust diameter possible, generating the least amount of backpressure, is ideal. However, I think it is rarely necessary to go over 3", or even that high in most situations.
Post Title: Re: (Ex-ricer01)
Posted by: VW Acolyte at 6:10 PM 5-29-2009
| Quote, originally posted by VW Acolyte » |
| i don't know you told you you didn't but they are stupid. |
gee you mean the people in the 12v forum and n/a forum? i had no idea.
i had no idea that back pressure PROMOTED scavanging.
Post Title: Re: (Ex-ricer01)
Posted by: Swoops at 10:48 AM 5-30-2009
to the op, since you already have a muffler, you should prolly just go with a y-pipe. unless you feel like spending the money on a dual outlet muffler.
Modified by Ex-ricer01 at 10:54 AM 5-30-2009
Post Title:
Posted by: onewiper at 11:33 AM 5-30-2009
Golly! All those guys at the drag strip with their open headers must be doing it all wrong and seat of the pants performance monitoring must be the official method of validating power gains.
Do some actual research before spouting off about back pressure.
Post Title: Re: (onewiper)
Posted by: brobs is back at 11:34 AM 5-30-2009
are stock watercooled vw engines drag motors?
Post Title: Re: (onewiper)
Posted by: n8burnz at 12:09 PM 5-30-2009
| Quote, originally posted by onewiper » |
| <q>YES YOU DO need back pressure,</q> Golly! All those guys at the drag strip with their open headers must be doing it all wrong and seat of the pants performance monitoring must be the official method of validating power gains. |
next time i am running a HEMI in my jetta i will run it open headers, i will get headers that have absolutely no bends in their 6" pipes so that there is no possible way there can be back pressure. you know what, **** that i won't even have an exhaust system at all. 
Modified by n8burnz at 12:19 PM 5-30-2009
Post Title: Re: (n8burnz)
Posted by: Ghetto-8v at 6:12 PM 5-30-2009
GM Blocks FTW.
Post Title:
Posted by: X37 at 6:37 PM 5-30-2009
| Quote, originally posted by Ghetto-8v » |
| But most cars at the track aren't Hemi's. GM Blocks FTW. |
i kinda assumed he was talking about AA fuel and funny cars. at least in the NHRA they are all running HEMI's
Post Title: Re: (onewiper)
Posted by: VW Acolyte at 8:53 AM 5-31-2009
| Quote, originally posted by onewiper » |
| <q>YES YOU DO need back pressure,</q> Golly! All those guys at the drag strip with their open headers must be doing it all wrong and seat of the pants performance monitoring must be the official method of validating power gains. |
ummm, im sorry, i thought i was in the VR6 forum, not the built drag motor forums. those motors you see at the strip are so built, they dont need a full exahust system. | Quote, originally posted by VW Acolyte » |
| I personally know of two people who both have done cams, chip, intake, and one did 2.25 cat back the other did 2.5. to the wheels, the 2.25 puts down a couple more ponies and torque. |
But that's not because of "moar backpressurez". It's due to increased exhaust velocity.
The job of any exhaust system is to evacuate the exhaust gases as quickly as possible while producing as little back pressure as possible. If you run 3" pipes, you won't have a lot of back pressure, but there isn't enough velocity created by the gases building in the header to move very quickly through the system. Bring the diameter down to 2.25, and the pressure of the building gases will flow a lot quicker, thus allowing your raging VR to evacuate the exhaust without sapping as much energy from the power stroke.
Post Title: Re: (onewiper)
Posted by: fightthisfeeling at 1:31 AM 6-2-2009
read :
|