Exhaust is weak!

[born2racekevin]

Alright so got some magnaflow exhaust and put it on..well its was weak..so I straight piped out the middle mufflers out and still not impressive! This happened to any of you! ?

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[mec]

Get a bigger turbo, and a 3" downpipe, and straightpipe the whole thing.

[texasboy21]

Ditch the cat..

[vce1232000]

Any other supporting mods[confused]

[born2racekevin]

Only other performance mod is a cold air intake at the moment ha...and no cat thats what my friend suggested haha

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[vce1232000]

Well with no other[wrench] supporting mods. A exhaust will not get you much[drive][race] performance. A stage 1 tune is the best bang for the buck[drool] for performance[up]

[xander3zero]

Alright so got some magnaflow exhaust and put it on..well its was weak..so I straight piped out the middle mufflers out and still not impressive! This happened to any of you! ?

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are you upset with the sound of the exhaust or the lack of performance it provides??

[born2racekevin]

The sound..its lacking compared to old beamer and civic..

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[vce1232000]

The sound..its lacking compared to old beamer and civic..

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Civic[confused][confused]... Oh My..... Time to turn in your audi card.....lol

[born2racekevin]

I was young and foolish!! Thought that ricer life was for me..its not!! Lol

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[Goldfinger978]

"Shit's weak son!"
Get a Revo Stage II tune and call it a a day. If you're unimpressed with the sound of your exhaust. Sell the A4 and straight pipe a V8! Vroooooom

[yeoj112689]

I just did straight pipes. Sounds amazing even with cat still on.

[QuattriumMT6]

What kind of magnaflows did you get? What size piping? 2.5", 3"? Tune should definitely bring more exhaust note out of your current setup. Sound clip(s)?

[LINDW4LL]

A bigger downpipe with cat delete and dual 2.5" will sound good. You don't need mufflers on the 2.0T IMO.

[dalmation53]

Civic[confused][confused]... Oh My..... Time to turn in your audi card.....lol

I LOLED by this. haha nice one man

[born2racekevin]

Its 3inch pipes..dual and ill try get a sound clip tomorrow

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[vce1232000]

Its 3inch pipes..dual and ill try get a sound clip tomorrow

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3 inch pipes[confused]. Thats to much breathing for a stock KO3 to push[facepalm]. Your losing alot of needed back psi....

[jimrobbington]

3 inch pipes[confused]. Thats to much breathing for a stock KO3 to push[facepalm]. Your losing alot of needed back psi....

You do not need back pressure on a turbo car

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[jimrobbington]

But yes, a tune should liven up the exhaust. Mine loses a lot of sound when I'm stock tuned

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[Charles.waite]

I just run a straight dump from the hotside of the turbo. It sounds so sick bro!

[rolleyes]

[yungcotter]

But yes, a tune should liven up the exhaust. Mine loses a lot of sound when I'm stock tuned

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Funny you say that i think its the exact opposite. I switched it to stock when my dad needed to borrow it the other day and the tone was much deeper and droneier

[jimrobbington]

Funny you say that i think its the exact opposite. I switched it to stock when my dad needed to borrow it the other day and the tone was much deeper and droneier

Weird, mine is definitely the opposite. It loses so much sound on the top end. Must depend on the exhaust then.

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[vce1232000]

You do not need back pressure on a turbo car

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I noticed a difference when I had[wrench] 2.5 inch versus 3 inch pipes on. The 3 inch pipes loss some low to mid range power[down] and barely felt little or no gain at all[=(] on the top end with another turbo car I owned.

[QuattriumMT6]

Weird, mine is definitely the opposite. It loses so much sound on the top end. Must depend on the exhaust then.

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Mine is the same way. Sounds more aggressive at lower rpms/slower speed. Highway and WOT the car sounds more...tame

[born2racekevin]

Ya thats how mine is..after about 3k Rpms it gets pretty calm! Thought it was pretry weird and not right ha

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[mec]

You do not need back pressure on a turbo car

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Thank you for calling bullshit

[vce1232000]

Thank you for calling bullshit

[=(][=(][=(]

[mec]

[=(][=(][=(]

Next we're gonna hear about how we need to set up scavaging to help with turbo pressure

[vce1232000]

Next we're gonna hear about how we need to set up scavaging to help with turbo pressure

Again your just a MEAN MAN Martin [=(][=(][=(].....

Anyway..I experience this power loss on my MK1 GTI stg 2 callaway turbo between the 2.5 and 3 inch exhausts[=(]. I can not however confirm this on the Avant. Since I never installed a full 3 inch exhaust.

[jsandor91]

maybe its in my head but when i went from just having the rai downpipe to having a full 3 inch exhaust it felt a bit more laggy down low.
here is a question for you guys i have two buddies each have a mk6 gti one is k03 and the other k04 both with exhaust cut outs why are they noticeably slower when spooling and at wot with them open[confused]


to the op gettting a downpipe / hfc or testpipe will make a noticeable sound and power difference. also once your tuned more psi = more loud

[mec]

Again your just a MEAN MAN Martin [=(][=(][=(].....

Anyway..I experience this power loss on my MK1 GTI stg 2 callaway turbo between the 2.5 and 3 inch exhausts[=(]. I can not however confirm this on the Avant. Since I never installed a full 3 inch exhaust.

Mmmmm no clue man...I'm just spitballin

[vce1232000]

Mmmmm no clue man...I'm just spitballin
I respect that honest answer[confused]............lol..............

[mec]

I respect that honest answer[confused]............lol..............

I like my new nickname though. Mec:Mean Man Martin! Quad M for short

[vce1232000]

maybe its in my head but when i went from just having the rai downpipe to having a full 3 inch exhaust it felt a bit more laggy down low.
here is a question for you guys i have two buddies each have a mk6 gti one is k03 and the other k04 both with exhaust cut outs why are they noticeably slower when spooling and at wot with them open[confused]


to the op gettting a downpipe / hfc or testpipe will make a noticeable sound and power difference. also once your tuned more psi = more loud

High flow is not always better[headbang]. It really depends on the application. Even thou we have turbo application cars we still require a certain amount of back psi for daily[drive] drive ability. Our turbo's are not on constant boast. before the moment is starts creating boast to generate additional power it relies on its normal aspirated ability to produce power. So the old school rules are still in effect with back psi. a 3 inch or even a 4 inch exhaust would be great if your in a track environment living at 5k rpm and better[race].

[mec]

High flow is not always better[headbang]. It really depends on the application. Even thou we have turbo application cars we still require a certain amount of back psi for daily[drive] drive ability. Our turbo's are not on constant boast. before the moment is starts creating boast to generate additional power it relies on its normal aspirated ability to produce power. So the old school rules are still in effect with back psi. a 3 inch or even a 4 inch exhaust would be great if your in a track environment living at 5k rpm and better[race].

on a k03 you make boost so quick you really don't have to worry about it at all. I see what you are getting at though, maybe if you had a giant turbo like a gt35...but then you would just downshift.

[Solarsuplex]

Well with no other[wrench] supporting mods. A exhaust will not get you much[drive][race] performance. A stage 1 tune is the best bang for the buck[drool] for performance[up]

Dude you need to chill with the faces in your posts.

[vce1232000]

Dude you need to chill with the faces in your posts.
I will take that into consideration [=(][=(]

[mec]

I will take that into consideration [=(][=(]

Doubt it....lol you seem like a nice guy, youre just the emoticon guy, I think like 8 people have commented on it now

[vce1232000]

on a k03 you make boost so quick you really don't have to worry about it at all. I see what you are getting at though, maybe if you had a giant turbo like a gt35...but then you would just downshift.
Damn, Quad M[hail], I just pulled a picture of a GT35 series turbo. That thing belongs on a diesel Caterpillar motor[drool]

[vce1232000]

Doubt it....lol you seem like a nice guy, youre just the emoticon guy, I think like 8 people have commented on it now

Quad M

I've always been the type to do the opposite of what they want me to do[facepalm][=(]............lol

[mec]

Damn, Quad M[hail], I just pulled a picture of a GT35 series turbo. That thing belongs on a diesel Caterpillar motor[drool]

surprisingly people run them on our cars! its actually a really neat turbo because the hot side is smaller than you would expect so it allows you to run big boost on a msall engine. especially that gtx3576, real neat stuff, if you ever get tired of the k04, check them out! Then setup your exhaust for scavaging lol

[vce1232000]

on a k03 you make boost so quick you really don't have to worry about it at all. I see what you are getting at though, maybe if you had a giant turbo like a gt35...but then you would just downshift.
Quad M,
Very good point with the KO3 making power down low. I wonder how it would react[drive] with a 3 or 4 inch exhaust in the street?

[vce1232000]

surprisingly people run them on our cars! its actually a really neat turbo because the hot side is smaller than you would expect so it allows you to run big boost on a msall engine. especially that gtx3576, real neat stuff, if you ever get tired of the k04, check them out! Then setup your exhaust for scavaging lol

You funny.....lol...scavaging......[headbang][facepalm]. I cant [wrench] a gt35 series on car. It would take to long to spool up in city[drive][=(]. But it does make me[drool] of the # it puts out

[mec]

You funny.....lol...scavaging......[headbang][facepalm]. I cant [wrench] a gt35 series on car. It would take to long to spool up in city[drive][=(]. But it does make me[drool] of the # it puts out

Yeah ....downside....is it puts out those numbers with a total 3000 powerband....5000-8000

[turbowop]

High flow is not always better[headbang]. It really depends on the application. Even thou we have turbo application cars we still require a certain amount of back psi for daily[drive] drive ability. Our turbo's are not on constant boast. before the moment is starts creating boast to generate additional power it relies on its normal aspirated ability to produce power. So the old school rules are still in effect with back psi. a 3 inch or even a 4 inch exhaust would be great if your in a track environment living at 5k rpm and better[race].

The turbo creates enough backpressure as it is. Have you ever seen the entry to a turbine wheel? It's tiny. Turbo engines are all about pressure differential. You want the least amount of backpressure after the turbo to get the quickest spool, meaning bigger exhaust = better when talking about turbo applications.

And with regard to the GT35r turbo, it's pretty damn fun on the street. I prefer the GT30r though, as the quicker spool makes it snappier. Not the same peak HP level, but fun nonetheless. Though I only have knowledge of those turbos on Mitsus. Although the motors are the same displacement, I'm not sure how well those results would transfer over to the Audi.

[vce1232000]

The turbo creates enough backpressure as it is. Have you ever seen the entry to a turbine wheel? It's tiny. Turbo engines are all about pressure differential. You want the least amount of backpressure after the turbo to get the quickest spool, meaning bigger exhaust = better when talking about turbo applications.

And with regard to the GT35r turbo, it's pretty damn fun on the street. I prefer the GT30r though, as the quicker spool makes it snappier. Not the same peak HP level, but fun nonetheless. Though I only have knowledge of those turbos on Mitsus. Although the motors are the same displacement, I'm not sure how well those results would transfer over to the Audi.

I can follow that theory[up]

Can you answer another members question[confused]

QUOTE=jsandor91;9385936]maybe its in my head but when i went from just having the rai downpipe to having a full 3 inch exhaust it felt a bit more laggy down low.
here is a question for you guys i have two buddies each have a mk6 gti one is k03 and the other k04 both with exhaust cut outs why are they noticeably slower when spooling and at wot with them open[confused]


to the op gettting a downpipe / hfc or testpipe will make a noticeable sound and power difference. also once your tuned more psi = more loud[/QUOTE]

[turbowop]

It's in his head or something else is wrong. Possibly a tune issue. Freeing up exhaust restriction allows quicker turbo spoolup. The only reason not to go with the biggest exhaust possible on a turbo car is for noise reduction.

[Charles.waite]

The turbo creates enough backpressure as it is. Have you ever seen the entry to a turbine wheel? It's tiny. Turbo engines are all about pressure differential. You want the least amount of backpressure after the turbo to get the quickest spool, meaning bigger exhaust = better when talking about turbo applications.

And with regard to the GT35r turbo, it's pretty damn fun on the street. I prefer the GT30r though, as the quicker spool makes it snappier. Not the same peak HP level, but fun nonetheless. Though I only have knowledge of those turbos on Mitsus. Although the motors are the same displacement, I'm not sure how well those results would transfer over to the Audi.

This is fact, not theory. Finally someone with some sense in this thread.

Feeling MEASURABLE differences in our cars in a catback exhaust (spool aside) is completely confirmation biase or tune issues. Backpressure is a bad thing in a turbo car. Anyone who says "well I did this and my car felt slower" is either expereriencing some other issue with the engine (exhaust leak pre-turbo for instance) or something else like a fouled O2 or tune issue.

likewise with people experiencing drone on a stock exhaust. You probably have a bad gasket on the DP or the bolts aren't tight...

My b6 drones because there is a crack in the flexpipe. Its the stock exhaust. I'm 1000% sure its not the mufflers fault. Its my dp flexpipe being broken (and possibly needing a new gasket as well).

People need to stop believing everything they read on the internet and use some common sense and reasoning abilities...

[vce1232000]

My thoughts on this is from experience not internet research[up]. Not theory[down]. But to each there own.[confused]. I rather not discount someone else opinion because its different from mine[confused]. So is zero back psi the best for these cars? That can possible mean 4 inch from the turbo back? How would that work on a stock KO3[confused]. Since there would be zero back psi[headbang]

[turbowop]

My thoughts on this is from experience not internet research[up]. Not theory[down]. But to each there own.[confused]. I rather not discount someone else opinion because its different from mine[confused]. So is zero back psi the best for these cars? That can possible mean 4 inch from the turbo back? How would that work on a stock KO3[confused]. Since there would be zero back psi[headbang]

You're obviously not getting this. There is already backpressure in the exhaust manifold due to the amount of exhaust gas trying to make it through the turbine section. Having the most open and free flowing exhaust after the turbine wheel allows it to spool up quicker due to less pressure after it. That means less lag and more power. Like already said, this is not theory, it is fact.

NA motors require a tuned exhaust to help promote velocity in the pipes, which helps to scavenge more exhaust gas from the cylinders. Totally different.

And it doesn't really matter how the engine responds when not in boost, IMO. Turbo motors have lower static compression so that they can deal with forced induction without detonation. Which makes their power output lame before boost comes on. The main goal is to get into boost where the engine is happy and more efficient...and making moar power. Having a larger exhaust is one of the ways to make that happen.

[4rings5stars]

Any "feeling" one gets with respect to different exhausts is a placebo. Most likely due to the sound changes

[LINDW4LL]

Can't you lose a little low end torque with too little backpressure? I know most people say you need zero backpressure, which very well may be accurate. I know that on the 2.7T, when people run open downpipes the vast majority of them say the car has a weaker low end. It could be the placebo effect of course, but the reasoning makes sense.

For example, let's exaggerate and say you had a 5 inch downpipe. The exhaust gases are going to have less velocity due to the increased diameter. Whereas with a 2.5" downpipe, the gases will have a high velocity. Obviously once you get past the low end, you will see gains from the larger pipe.

I'm not an engineer so maybe that doesn't make sense.

[AudiTFSI3o3]

hi guys [:)]. sometimes i feel like [headbang] because i can't [poop]. oh well [az] anyways

[jimrobbington]

hi guys [:)]. sometimes i feel like [headbang] because i can't [poop]. oh well [az] anyways

Did vce1232000 hack Joe's account?

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[turbowop]

Can't you lose a little low end torque with too little backpressure? I know most people say you need zero backpressure, which very well may be accurate. I know that on the 2.7T, when people run open downpipes the vast majority of them say the car has a weaker low end. It could be the placebo effect of course, but the reasoning makes sense.

For example, let's exaggerate and say you had a 5 inch downpipe. The exhaust gases are going to have less velocity due to the increased diameter. Whereas with a 2.5" downpipe, the gases will have a high velocity. Obviously once you get past the low end, you will see gains from the larger pipe.

I'm not an engineer so maybe that doesn't make sense.

No. Please read what I already wrote.

All the exhaust gas exiting the cylinders is forced into a volute that has a diameter probably as small as your pinky, thus creating backpressure in the exhaust manifold. Having less restriction after the turbine wheel means that the pressurized exhaust gas in the exhaust manifold (backpressure) can exit more quickly and spin the turbine wheel faster. So, THERE IS ALREADY BACKPRESSURE IN THE EXHAUST MANIFOLD DUE TO SO MUCH EXHAUST GAS BEING BACKED UP BY THE TURBINE VOLUTE. Having a large exhaust means that pressure can escape faster. It's all about pressure differential.

[vce1232000]

You're obviously not getting this. There is already backpressure in the exhaust manifold due to the amount of exhaust gas trying to make it through the turbine section. Having the most open and free flowing exhaust after the turbine wheel allows it to spool up quicker due to less pressure after it. That means less lag and more power. Like already said, this is not theory, it is fact.

NA motors require a tuned exhaust to help promote velocity in the pipes, which helps to scavenge more exhaust gas from the cylinders. Totally different.

And it doesn't really matter how the engine responds when not in boost, IMO. Turbo motors have lower static compression so that they can deal with forced induction without detonation. Which makes their power output lame before boost comes on. The main goal is to get into boost where the engine is happy and more efficient...and making moar power. Having a larger exhaust is one of the ways to make that happen.

I can see what your sayin[hail][up]. This is only my 3rd turbo car. So i'm still on a learning curve on this [confused][=(]. I'm just going by my past experience what had worked for me[up][race]. But always learning.

So does anyone have a 3 or 4 inch straight pipe exhaust from the downpipe to see what performance is??

[vce1232000]

hi guys [:)]. sometimes i feel like [headbang] because i can't [poop]. oh well [az] anyways

You hurt my feelings[=(][=(][=(][=(]..........

A difference in opinion does not mean [poop]. Its just that[up]. But I at least have one... That belongs to me[hail][az]

[turbowop]

For our cars power output, unless you have a much larger turbo installed and are making big power, a 2.5" exhaust is more than sufficient. The only gain you would see running a larger diameter exhaust is noise output. I run a 3" turbo-back exhaust on my Mitsu and it puts down over 425whp. No need for a 4" pipe at that power level either.

I always say bigger is better with turbo cars, but there is a point of diminishing returns.

[vce1232000]

Got what your sayin[hail][up]. How about 2 identical stock KO3's cars. One [drive] a 2.5 inch pipes with mufflers and the 2nd[drive] one running 2.5 inch straight pipes. Which one do you think would[race] perform better?

[jimrobbington]

I really think he has emoticon tourettes

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[AudiTFSI3o3]

hahahahahahahhaahahahahahah

[turbowop]

Got what your sayin[hail][up]. How about 2 identical stock KO3's cars. One [drive] a 2.5 inch pipes with mufflers and the 2nd[drive] one running 2.5 inch straight pipes. Which one do you think would[race] perform better?

Depends on how restrictive the mufflers are. But I doubt you would notice much difference.

[Der Konig]

http://s2.quickmeme.com/img/b5/b506267dfc2419fd80b1202968d93ed0ab8dfa6730cf642d4e a868b783113c11.jpg

[LINDW4LL]

How about 2 identical stock KO3's cars. One a 2.5 inch pipes with mufflers and the 2nd one running 2.5 inch straight pipes. Which one do you think would perform better?
The cats are the main restriction. The mufflers would have no noticeable effect.

[jsandor91]

I can see what your sayin[hail][up]. This is only my 3rd turbo car. So i'm still on a learning curve on this [confused][=(]. I'm just going by my past experience what had worked for me[up][race]. But always learning.

So does anyone have a 3 or 4 inch straight pipe exhaust from the downpipe to see what performance is??

i have the rai downpipe which is 4 inches out of the turbo then it goes down to 3 inches to split 2.5's

like others have said the difference i felt was possibly placebo or maybe the car adapting ?
my friend with the mk6 k04 believes there is a noticeable difference in spool time from open downpipe to stock exhaust but idk [headbang]

[Charles.waite]

i have the rai downpipe which is 4 inches out of the turbo then it goes down to 3 inches to split 2.5's

like others have said the difference i felt was possibly placebo or maybe the car adapting ?
my friend with the mk6 k04 believes there is a noticeable difference in spool time from open downpipe to stock exhaust but idk [headbang]

No you did feel a difference. Because the cat is a huuuuge restriction. Replacing it with a test pipe or hfc and a larger downpipe does allow the Turbo to spool quicker and thus make power more quickly.

But yes, the rest of the exhaust past the catalyst really has zero effect on power. Noise yes. Power no.

This isn't some thing that is exclusive to Audis. This is the case on pretty much every turbocharged car ever.

[jimrobbington]

I believe seal66 is running a full 3" exhaust. He had it with his KO3 and now with his k04

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[4rings5stars]

I need something for the headache I have from all these emoticons[headbang][headbang][headbang]

[slappomatt]

Funny you say that i think its the exact opposite. I switched it to stock when my dad needed to borrow it the other day and the tone was much deeper and droneier

A stock tune will most likely retard the timing a lot compared to a chipped tune. Hence the deeper drone automatic civic sound.