May interest some
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Joined: Mar 2006
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From: Ohio
...
looks like a very nice kit, are you going to install it yourself? would be a fun project....
i just have one problem with it, that exhaust necks down from what looks to be 3" to 2.5" mid way through...very bad thing for a turbo car...why would they do that?
i just have one problem with it, that exhaust necks down from what looks to be 3" to 2.5" mid way through...very bad thing for a turbo car...why would they do that?
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Audi S4 Downpipes
Originally Posted by 1FASTC32
looks like a very nice kit, are you going to install it yourself? would be a fun project....
i just have one problem with it, that exhaust necks down from what looks to be 3" to 2.5" mid way through...very bad thing for a turbo car...why would they do that?
i just have one problem with it, that exhaust necks down from what looks to be 3" to 2.5" mid way through...very bad thing for a turbo car...why would they do that?
it was explained to me that the critical part for exhaust restriction is the catalytic. Making the downpipe 3" was to increase the surface area of the cat reducing this restriction. After that, the size becomes less important and there are space limitations as well. The stock downpipes are 2.2" with two cats each that Y into a single 2.2 exhaust pipe.
My son and I are doing the installation sometime in June. The engine has to be pulled because of the difficulty getting access to the turbos, oil and water lines.
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Joined: Mar 2006
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From: Ohio
...
Originally Posted by Catapult
1FASTC32,
it was explained to me that the critical part for exhaust restriction is the catalytic. Making the downpipe 3" was to increase the surface area of the cat reducing this restriction. After that, the size becomes less important and there are space limitations as well. The stock downpipes are 2.2" with two cats each that Y into a single 2.2 exhaust pipe.
My son and I are doing the installation sometime in June. The engine has to be pulled because of the difficulty getting access to the turbos, oil and water lines.
it was explained to me that the critical part for exhaust restriction is the catalytic. Making the downpipe 3" was to increase the surface area of the cat reducing this restriction. After that, the size becomes less important and there are space limitations as well. The stock downpipes are 2.2" with two cats each that Y into a single 2.2 exhaust pipe.
My son and I are doing the installation sometime in June. The engine has to be pulled because of the difficulty getting access to the turbos, oil and water lines.
1. not going any bigger than you need to helps with the exhaust gas scavenging...i.e. what you described above...
2. with a turbocharged motor, you don't want any restriction after the turbo, because that is the biggest restrictiont that there is in the exhaust system...i.e. you could run an open down pipe and still be better off than running any exhaust system...
i tend to agree with the second, mainly because i have seen it work in person both on the dyno and on the track...the numbers don't lie
in your case it probably is not a big enough deal to worry about, just sharing some experience here, good luck on the install, should be fun times with your son...
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Joined: Jan 2006
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From: Philly
2003 Pewter C32
Bigger pipes aren't always better a good friend of mine does prototyping for audis, porsches, and vws and he tells me that he tried a 3inch exhaust on an audi and it lost 10hp but when he used 2.5 the turbo car gained 5hp to the wheels. Air doesn't move as fast through bigger piping, that is also why many companies exhaust systems will slowly shrink towards the rear to push the air out faster.
Anyway that was my .02
Anyway that was my .02
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Joined: Mar 2006
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From: Ohio
...
Originally Posted by PBenz32
Bigger pipes aren't always better a good friend of mine does prototyping for audis, porsches, and vws and he tells me that he tried a 3inch exhaust on an audi and it lost 10hp but when he used 2.5 the turbo car gained 5hp to the wheels. Air doesn't move as fast through bigger piping, that is also why many companies exhaust systems will slowly shrink towards the rear to push the air out faster.
Anyway that was my .02
Anyway that was my .02
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From: Portland, OR
'03 E55 AMG
Originally Posted by Catapult
Here are images of an Audi B5 S4 stage 3 upgrade kit. About the same cost as a Kleeman SC, brakes excluded.
The ECU has four selectable programs: Stock; 93 octane; 100 octane; valet.
The ECU has four selectable programs: Stock; 93 octane; 100 octane; valet.
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From: Portland, OR
'03 E55 AMG
Originally Posted by FrankW
are all these installed yet?? dyno dyno dyno!! 
Lots o' fun.
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From: Portland, OR
'03 E55 AMG
Originally Posted by KompressorKev
b5 s4's can be killer quick cars. are those k04's? how about some k04/k24 zero clearanced hybrids or better yet, some twin gt25's those things rip
or better yet, some twin gt25's those things ripHow about a pic of your C32 in your sig Kev?
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Originally Posted by FrankW
are all these installed yet?? dyno dyno dyno!!
you're a little ahead of me. I have been busy with the C55 and now I will get back to the S4. Tomorrow I get the air con evacuated. That way I won't have it hanging in the way when I pull the engine.
Besides that we are working on my son's STi. Too many projects.
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From: Diamond Bar, CA
W206 PHEV AMG
Originally Posted by Catapult
Frank,
you're a little ahead of me. I have been busy with the C55 and now I will get back to the S4. Tomorrow I get the air con evacuated. That way I won't have it hanging in the way when I pull the engine.
Besides that we are working on my son's STi. Too many projects.
you're a little ahead of me. I have been busy with the C55 and now I will get back to the S4. Tomorrow I get the air con evacuated. That way I won't have it hanging in the way when I pull the engine.
Besides that we are working on my son's STi. Too many projects.
can't wait to see all your cars are done.
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Joined: May 2006
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From: Portland, OR
'03 E55 AMG
What are you doing to the STi Catapult? FP Green turbo?
Give the guys at www.pdxtuning.com a call if you need anything. They are the best in the country IMHO.
Give the guys at www.pdxtuning.com a call if you need anything. They are the best in the country IMHO.
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Got started today
Originally Posted by FrankW
awesome.
can't wait to see all your cars are done.
can't wait to see all your cars are done.
Frank,
started getting the engine ready to pull. Still need to loosen the struts, disconnect the drive shaft and shift linkage and misc, other connections. Hope to get is all ready to pull next weekend. Taking it slow and I want to do everything right.
Catapult
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Originally Posted by jeremy@matrix
What are you doing to the STi Catapult? FP Green turbo?
Give the guys at www.pdxtuning.com a call if you need anything. They are the best in the country IMHO.
Give the guys at www.pdxtuning.com a call if you need anything. They are the best in the country IMHO.
my son has been doing all the research and so far bought an exhaust from ASP, a top mounted intercooler from Perrin, engine management from Element and is waiting for a turbo from Deadbolt. He has added AP Racing brakes and a light wait crank pulley from Autospeed Performance. I will tell him about the site you mentioned but would be surprise if he didn't know about it already.
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Joined: May 2006
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From: Portland, OR
'03 E55 AMG
Originally Posted by Catapult
Hi Jeremy
my son has been doing all the research and so far bought an exhaust from ASP, a top mounted intercooler from Perrin, engine management from Element and is waiting for a turbo from Deadbolt. He has added AP Racing brakes and a light wait crank pulley from Autospeed Performance. I will tell him about the site you mentioned but would be surprise if he didn't know about it already.
my son has been doing all the research and so far bought an exhaust from ASP, a top mounted intercooler from Perrin, engine management from Element and is waiting for a turbo from Deadbolt. He has added AP Racing brakes and a light wait crank pulley from Autospeed Performance. I will tell him about the site you mentioned but would be surprise if he didn't know about it already.
Have fun with the projects!
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From: Portland, OR
'03 E55 AMG
Originally Posted by m3_eater
I'm curious but not trying to hijack the thread, so reply via PM if you like: Just how much can the wick be turned up on an Sti these days and still have the car be streetable?
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The engine is out
Originally Posted by jeremy@matrix
Looking good so far!
