exhaust for 156 3.0 v6/gta - Alfa Romeo Forum
You are currently unregistered, register for more features.    
Tuning & Upgrades Discuss performance enhancements for your Alfa Romeo

 
Thread Tools
(Post Link) post #1 of 13 Old 06-10-08 Thread Starter
Status: -
AO Member
 
Join Date: Feb 2008
Posts: 87

Member car:

156

exhaust for 156 3.0 v6/gta

Hi I got a 156 3.0 v6. I want to put there a straight pipe to the OEM rear exhaust? which dimension should I choose?
What is the GTA exhaust size?
thanks a lot

Last edited by b.pawelek; 06-10-08 at 22:33.
b.pawelek is offline  
Sponsored Links
Advertisement
 
Status: Busy busy busy!
Club Member
Membro Premio
 
Pud237's Avatar
 
Club Member Number: 71
Join Date: Apr 2006
Location: United Kingdom
County: Cumbria
Posts: 44,801
Re: exhaust for 156 3.0 v6/gta

Do you mean the diameter of the centre pipe?

What manifolds are you using? 2.5 Euro 2 manifolds I guess? These are pretty good, much better than the GTA or 2.5 euro 3 manifolds with cats in
Pud237 is offline  
(Post Link) post #3 of 13 Old 06-10-08 Thread Starter
Status: -
AO Member
 
Join Date: Feb 2008
Posts: 87

Member car:

156

Re: exhaust for 156 3.0 v6/gta

I'm useing a 2.5 euro 2 mainfold. And I'm preparing the custom central pipe. What should be the dimension?
b.pawelek is offline  
Status: -
AO Silver Member
 
swanny's Avatar
 
Join Date: Feb 2006
Location: Devon
Posts: 1,571
Re: exhaust for 156 3.0 v6/gta

Quote:
Originally Posted by b.pawelek View Post
Hi I got a 156 3.0 v6. I want to put there a straight pipe to the OEM rear exhaust? which dimension should I choose?
What is the GTA exhaust size?
thanks a lot
I got my standard GTA exhaust in the garage - I'll measure tomorrow if you tell me what measurements you want.
swanny is offline  
(Post Link) post #5 of 13 Old 06-10-08 Thread Starter
Status: -
AO Member
 
Join Date: Feb 2008
Posts: 87

Member car:

156

Re: exhaust for 156 3.0 v6/gta

i want to know the diameter of the central part of the exhaust.
b.pawelek is offline  
Status: Busy busy busy!
Club Member
Membro Premio
 
Pud237's Avatar
 
Club Member Number: 71
Join Date: Apr 2006
Location: United Kingdom
County: Cumbria
Posts: 44,801
Re: exhaust for 156 3.0 v6/gta

3" should be plenty I'd imagine.. You don't want it to be too unrestrictive, as its the backpressure that helps clear your cylinders of exhaust gasses. At low rpms with a big bore exhaust the car is going to feel very lethargic. Would be good for top end though, but a properly tuned exhaust system is always better all round.
Pud237 is offline  
(Post Link) post #7 of 13 Old 07-10-08 Thread Starter
Status: -
AO Member
 
Join Date: Feb 2008
Posts: 87

Member car:

156

Re: exhaust for 156 3.0 v6/gta

I'm not sure if 3" woul be ok. It too much in my opinion. the 2.5 v6 have 2" or even less.
b.pawelek is offline  
Status: -
AO Silver Member
 
swanny's Avatar
 
Join Date: Feb 2006
Location: Devon
Posts: 1,571
Re: exhaust for 156 3.0 v6/gta

Quote:
Originally Posted by b.pawelek View Post
i want to know the diameter of the central part of the exhaust.

2 1/2 inches diameter on a standard GTA exhaust
swanny is offline  
Status: Waiting for Stelvio QV
AO Platinum Member
 
OperationAlfa's Avatar
 
Join Date: May 2007
Location: United Kingdom
County: Essex
Posts: 23,452
Re: exhaust for 156 3.0 v6/gta

Quote:
Originally Posted by b.pawelek View Post
i want to know the diameter of the central part of the exhaust.
60mm.
OperationAlfa is offline  
Status: Busy busy busy!
Club Member
Membro Premio
 
Pud237's Avatar
 
Club Member Number: 71
Join Date: Apr 2006
Location: United Kingdom
County: Cumbria
Posts: 44,801
Re: exhaust for 156 3.0 v6/gta

Is that internal diameter or external?

3" would be fine I would have thought, if you are still running the 2.5 gearbox sacrificing a bit of torque low down is fine if it means you are getting a bit more power at the top end.
Pud237 is offline  
Status: Waiting for Stelvio QV
AO Platinum Member
 
OperationAlfa's Avatar
 
Join Date: May 2007
Location: United Kingdom
County: Essex
Posts: 23,452
Re: exhaust for 156 3.0 v6/gta

internal diameter.
OperationAlfa is offline  
Status: 156 3.0 GTAm 1070kg 200kw
AO Silver Member
 
alan Q4+33's Avatar
 
Join Date: Sep 2006
Location: Slovenia
County: -
Posts: 2,020

Member car:

156, 166

Re: exhaust for 156 3.0 v6/gta

I think 3" is too much. 3" is used on tuned turbo engines where the turbine makes the backpressure and the rest of the exhaust is only an unessesary piece of metal (well almost)

I think that for 3.0 v6 with some modifications (around 240-250bhp) some 65 to max 70mm of outer diameter is enough.

I'm asking the same question for my GTV, to see what others think.
alan Q4+33 is offline  
Status: Got toys!
AO Member
 
strat24v's Avatar
 
Join Date: Jan 2007
Location: derbyshire, uk.
Posts: 691
Re: exhaust for 156 3.0 v6/gta

My Gta engined Stratos has 2.5 inch 16 guage stainless tubing for the secondary pipework.

If you take a VERY close look on S/S's website, it gives the secondary tube diameter
strat24v is offline  
Reply

Go Back   Alfa Romeo Forum > Supported Alfa Romeo Models > Technical & Vehicle Assistance > Tuning & Upgrades

Tags
156 , exhaust , v6 or gta

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome