3 1/2" downpipe????

chillz · Sep 9, 2004

Just wanted to know if anyone out there has ran a 3 1/2" DP or has even seen one? What kind of power gains or loses have you seen? I really wanted to know if this is a good idea or not? Let me know what you think. http://****************.com/smile/emthup.gif http://****************.com/smile/emthdown.gif ?

Modified by chillz at 12:33 AM 9-10-2004

Rippinralf · Sep 14, 2004

Re: 3 1/2" downpipe???? (DiscoZ)

oh ya, well my wastegate dump is 6" thats 1" bigger than boppers dump

j/k
3" for me

fast_a2_20v · Sep 14, 2004

oh ya, well i'm just going to seal my whole engine off in a 3ft drain culvurt... that'll give me hardly ANY backpressure.

areku_x · Sep 14, 2004

Re: 3 1/2" downpipe???? (bopper)

Quote, originally posted by bopper »

i run a 5'' dump

holy ****

screwball · Sep 14, 2004

Re: 3 1/2" downpipe???? (areku_x)

mad powa yo

DiscoZ · Sep 14, 2004

Re: (fast_a2_20v)

Quote, originally posted by fast_a2_20v »

oh ya, well i'm just going to seal my whole engine off in a 3ft drain culvurt... that'll give me hardly ANY backpressure.

Why even run a downpipe? Just leave the turbo unbolted...

tdimax · Sep 14, 2004

Re: (chillz)

3.5" DP no room for it , and need a big canuk of a Turbo for it , + with high revs like 8500-9000rpm other wise i see no point i m running DP 3" with K04s and it's more then i need
MikeZ

Red Pocket Rocket · Sep 14, 2004

Re: (DiscoZ)

Quote, originally posted by DiscoZ »

Why even run a downpipe? Just leave the turbo unbolted...

cause you'll light something on fire.

DarkSideGTI · Sep 14, 2004

Re: (Nightrider)

Quote, originally posted by Nightrider »

Not so true on a turbo engine... no exhaust is the best exhaust, that is why so many people run with dump tubes. The only problems you might run into are the cat efficency codes and fitment. If it fits and you can ignore the CEL then you are golden.

Do you really think that having no exhaust and having a large exhaust is the same thing? It is possible to have an exhaut that is too big. By getting an exhaust that is too big you will run into problems getting the gasses out of it . Think of it this way. Say you have a few straws in different sizes. You take a small one and blow into it. You will need to blow pretty hard to get air out of it. Then you take a medium sized one and blow into it. Air is allowed to escape much quicker. Then you blow into the large one. Sure a lot of air is getting out, but you need to blow harder to get that air out.
I think 3.5" is way too big, especially for the stock turbo. 2.5" is perfect for the K03.

DiscoZ · Sep 14, 2004

Re: (Red Pocket Rocket)

Quote, originally posted by Red Pocket Rocket »

cause you'll light something on fire.

Erm, that was sarcasm. He was being sarcastic too.

fshowcarz · Sep 14, 2004

Re: (Jedi801)

i unbolted the exhaust side of my turbo to gain performance... now i have NO backpressure, but me and my friends were thinking about it... and i removed the intake side of my turbo too... now it's free flowing and the fastest evAr

1.8tizzle · Sep 14, 2004

Re: (fshowcarz)

id rock a 3 1/2" downpipe....... ride in a wrx with a 4" and youll know what i mean. http://****************.com/smile/emthup.gif

DarkSideGTI · Sep 14, 2004

Re: (1.8tizzle)

Quote, originally posted by 1.8tizzle »

id rock a 3 1/2" downpipe....... ride in a wrx with a 4" and youll know what i mean. http://****************.com/smile/emthup.gif

yeah who cares if it robs HP? As long as it sounds good I'm game.

OneQuickDub · Sep 14, 2004

Re: (VR6-JettaIII)

Quote, originally posted by VR6-JettaIII »

there is absolutely no reason for anyone to need a 3.5" exhaust on any VW motor.

then why do people run open dump at the track

DarkSideGTI · Sep 14, 2004

Re: (OneQuickDub)

Quote, originally posted by OneQuickDub »

then why do people run open dump at the track

That's completely different than a huge exhaust.

crazy18T · Sep 23, 2004

Re: (Jedi801)

Chillz, Do you have any pics of your 3.5 inch?

AllofurVWRbelong2me · Sep 23, 2004

Re: 3 1/2" downpipe???? (chillz)

wouldent that warrent too much backpressure...for even one of the bigger turbos our car could handle? maybe im a bit off...like ive said in my first post...this is my first VW...I come from Hondaland...we hate backpressure...its evil....

;

MRP2001GTi · Sep 23, 2004

Re: (Jedi801)

There is no way a larger downpipe can rob horsepower when no exhaust at all makes the most HP.

fast_a2_20v · Sep 23, 2004

no, but its just pointless expense and pain in the ass on the stock turbo.

Isard · Sep 23, 2004

Re: (crazy18T)

I've got an 3.5" downpipe, with a 3" exhaust system. Well, I don't know if I can call it that, without any mufflers.

Here's a picture of my downpipe:

The rest of my exhaust:

And it sounds more like a big-block V8 than a diesel engine.

fshowcarz · Sep 23, 2004

Re: (1.8tizzle)

Quote, originally posted by 1.8tizzle »

id rock a 3 1/2" downpipe....... ride in a wrx with a 4" and youll know what i mean. http://****************.com/smile/emthup.gif

yeah, wrx's also have a 'muffler' before their turbo (up-pipe)... wanna toss one of those on too?

Buttero J-Lo · Sep 23, 2004

Re: (fshowcarz)

Quote, originally posted by fshowcarz »

yeah, wrx's also have a 'muffler' before their turbo (up-pipe)... wanna toss one of those on too?

im sure if he running a 4" dp on his wrx, then there will be no cat in the up-pipe, and hopefully a bigger than stock turbo(no vf series period). Im still not saying a 4" is at all needed though.

fshowcarz · Sep 23, 2004

Re: (ButteroJ)

they actually run the 4'' on a stock turbo... and the up-pipe swap is independent of the exhaust... it's a pita to get on... my bud has a sub and i get to work on it all the time.

Buttero J-Lo · Sep 23, 2004

Re: (fshowcarz)

same here. im friends with 2 sti's and 3 wrxs, as well as friends with a rather large wrx tuning shop(xx tuning). i know some people run the 4" on stock turbos, but they are just retarded. it is not needed. the up-pipe isnt that hard after youve done a few. the header is a bigger pita

fshowcarz · Sep 23, 2004

Re: (ButteroJ)

Quote, originally posted by ButteroJ »

the up-pipe isnt that hard after youve done a few. the header is a bigger pita

did you remove the turbo to do the up, or did you drop the exhaust mani?

Buttero J-Lo · Sep 23, 2004

Re: (fshowcarz)

undid a motor mount and tilted it forward http://****************.com/smile/emthup.gif

3 1/2" downpipe????

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