Alfa 156 2.4 20v JTD - decat downpipe - 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 24 Old 09-10-13 Thread Starter
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: 44,808
Alfa 156 2.4 20v JTD - decat downpipe

Hi all

Anyone interested in a decat downpipe for an Alfa 156 2.4 JTD 20v? They will only fit this model. These bolt between the turbocharger and the second part of the downpipe and remove the pre-cat. Benefits will be cooler turbo operation, and of course the prospect of faster spooling, increased power through reduced pressure in the manifold, and with any luck increased fuel economy too.

These will be manufactured by Wizard shortly, with the usual high quality components and construction. I've got 5 sets of CNC bends, V-bands and laser-cut flanges coming, one of which is going on my car, so 4 will be available. Not 100% on costs yet but the first batch will always be the cheapest one

If anyone is interested - let me know

Autolusso Penrith - UK's leading independent Alfa Romeo specialist with branches in Bedfordshire, Cumbria & Dorset

Wizard Exhaust systems available here

Tel: 01768 879 171
Pud237 is offline  
Sponsored Links
Advertisement
 
Status: -
AO Member
 
charliealfamike's Avatar
 
Join Date: Sep 2013
Location: United Kingdom
County: Suffolk
Posts: 711
Quote:
Originally Posted by Pud237 View Post
Hi all

Anyone interested in a decat downpipe for an Alfa 156 2.4 JTD 20v? They will only fit this model. These bolt between the turbocharger and the second part of the downpipe and remove the pre-cat. Benefits will be cooler turbo operation, and of course the prospect of faster spooling, increased power through reduced pressure in the manifold, and with any luck increased fuel economy too.

These will be manufactured by Wizard shortly, with the usual high quality components and construction. I've got 5 sets of CNC bends, V-bands and laser-cut flanges coming, one of which is going on my car, so 4 will be available. Not 100% on costs yet but the first batch will always be the cheapest one

If anyone is interested - let me know
Could be interested dependent on cost delivery dates! When do you plan to have these in stock?
charliealfamike is offline  
(Post Link) post #3 of 24 Old 10-10-13 Thread Starter
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: 44,808
Do you have a 156 or a 159? Your member car says 159, so just thought I'd double check. These will only fit the 156..
Pud237 is offline  
Status: -
AO Member
 
charliealfamike's Avatar
 
Join Date: Sep 2013
Location: United Kingdom
County: Suffolk
Posts: 711
Quote:
Originally Posted by Pud237 View Post
Do you have a 156 or a 159? Your member car says 159, so just thought I'd double check. These will only fit the 156..
My mistake. That'll teach me to read things more carefully before I reply

Mine's a 159.
charliealfamike is offline  
(Post Link) post #5 of 24 Old 11-10-13 Thread Starter
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: 44,808
No worries

Maybe one day we will build them for the 2.4 20v 159 as well.
Pud237 is offline  
Status: Alfa fanatic
AO Member
 
j300sjl's Avatar
 
Join Date: May 2009
Location: United Kingdom
County: -
Posts: 401
I could be interested but depends on what kind of cost we are talking ?
j300sjl is offline  
Status: -
AO Silver Member
 
Join Date: Jul 2012
Location: United Kingdom
County: Cambridgeshire
Posts: 1,144
Interested cost dependant
swampy76 is offline  
(Post Link) post #8 of 24 Old 13-10-13 Thread Starter
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: 44,808
Anyone else interested? I'm hoping to make my 20v as good on fuel as my 10v was and I think running without the pre-cat will help.
Pud237 is offline  
Status: playing kill by numbers
AO Gold Member
 
Join Date: Feb 2005
Location: Belgium
County: Down in the Park
Posts: 8,786
No but that's only because I have a giulietta... 1.6 and 2.0 JTDM share the DPF on those cars btw, so one downpipe would fit all diesels (hint)
Cuore_Sportivo_155 is offline  
(Post Link) post #10 of 24 Old 13-10-13 Thread Starter
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: 44,808
Good to know, cheers
Pud237 is offline  
DG_
Status: -
AO Member
 
Join Date: Mar 2008
Location: United Kingdom
County: Kent
Posts: 137
I'm definitely interested. I've been wanting to de-cat and run straight exhaust pipe for a while, but it would also depend on price for me too.

DG_ is offline  
(Post Link) post #12 of 24 Old 15-11-13 Thread Starter
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: 44,808
Here are some photos - hopefully fitting mine next week, along with the hybrid turbocharger
Attached Images
File Type: jpg Parts 009.jpg (247.9 KB, 45 views)
File Type: jpg Parts 010.jpg (230.1 KB, 38 views)
File Type: jpg Parts 011.jpg (213.3 KB, 32 views)
Pud237 is offline  
Status: Suck , Squeeze , Bang , Smoke!
Club Member
Membro Premio
 
Allerd's Avatar
 
Club Member Number: 1723
Join Date: Mar 2011
Location: Netherlands
County: Drenthe
Posts: 770
looking good!!
Allerd is offline  
(Post Link) post #14 of 24 Old 16-11-13 Thread Starter
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: 44,808
Thanks Allerd. Did you ever fit one of these when you still had the standard turbo or did you change turbo first?
Pud237 is offline  
Status: playing kill by numbers
AO Gold Member
 
Join Date: Feb 2005
Location: Belgium
County: Down in the Park
Posts: 8,786
Mine didn't look as good but I made one for my old 10v after I binned the TD2503v and put the GT2256V from 175 bhp model...

It really does look like the fittings are in the same place
Cuore_Sportivo_155 is offline  
Status: Suck , Squeeze , Bang , Smoke!
Club Member
Membro Premio
 
Allerd's Avatar
 
Club Member Number: 1723
Join Date: Mar 2011
Location: Netherlands
County: Drenthe
Posts: 770
Quote:
Originally Posted by Pud237 View Post
Thanks Allerd. Did you ever fit one of these when you still had the standard turbo or did you change turbo first?
i'm not sure, I think I swapped it together with the modified gt2256v.
You probably going to have get it cleaned or even modified anyway as boost will spike more with this downpipe, and these turbo;s allready have a hard time controling boost in stock situation
Allerd is offline  
(Post Link) post #17 of 24 Old 18-11-13 Thread Starter
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: 44,808
Quote:
Originally Posted by Allerd View Post
i'm not sure, I think I swapped it together with the modified gt2256v.
You probably going to have get it cleaned or even modified anyway as boost will spike more with this downpipe, and these turbo;s allready have a hard time controling boost in stock situation
Never had that problem with opening up the precat and taking the insides out, but I'll bear it in mind. Anyway the turbo is being replaced at the same time, Adam has done me a hybrid gt2256v, there is a 60mm billet compressor wheel and cut-back turbine wheel - can't wait!
Pud237 is offline  
Status: -
AO Member
 
Join Date: Dec 2007
County: -
Posts: 53
Garage
Quote:
Originally Posted by Allerd View Post
i'm not sure, I think I swapped it together with the modified gt2256v.
You probably going to have get it cleaned or even modified anyway as boost will spike more with this downpipe, and these turbo;s allready have a hard time controling boost in stock situation
I asked Stephan (from Squadra) about that before I had mine fitted, controlling the boost would be more of a problem with a 16v than a with 20v. At least that's what he said. Mine had an overboost error once with just the decat downpipe (rest all standard) and recently a what I expect was a second time (went into the low-power thing, switched on and off again and back was the full power, just as it did the first time) now that the second cat and back box is straight too.

I'll have to find my OBD cable again and log some values to determine if it has just trouble regulating boost or that maybe the VNT is clogged up and was stuck for a moment causing the boost to spike..

Ow, I almost forget.. VERY nice looking downpipe by the way!

Alfa 156SW 20v 2.4JTD
SW_Joost is offline  
Status: -
AO Member
 
Join Date: Dec 2013
Location: United Kingdom
County: Anglesey
Posts: 11
Any update on these? Are they available still and how much? Are the benefits proven?
her Alfa is offline  
(Post Link) post #20 of 24 Old 20-12-13 Thread Starter
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: 44,808
Mine is fitted and installed, there are two others out there as well. I don't think anyone's had their car on a dyno but removing the pre-cat is an well-proven modification for the JTDm engines. Mine has gone on with a bigger turbo but its spooling better than it ever did before, I was expecting it to be a little laggier at lower revs.
Pud237 is offline  
Status: -
Newbie
 
Join Date: Oct 2014
County: -
Posts: 1

Member car:

Alfa Romeo 156

I'm interested too, what is the price?
Deniro is offline  
(Post Link) post #22 of 24 Old 07-10-14 Thread Starter
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: 44,808
Hi Deniro, can you email me with your shipping address - my email is pud237 (at symbol) gmail (dot) com
Pud237 is offline  
Status: -
Newbie
 
Alfatec 156's Avatar
 
Join Date: Jan 2015
Location: United Kingdom
County: Dorset
Posts: 7
Hey can you still get hold of these decat down pipes?
Cheers
Alfatec 156 is offline  
(Post Link) post #24 of 24 Old 09-03-15 Thread Starter
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: 44,808
Yeah, we make them to order, PM me or send us a message on our Facebook page if you can't send PMs yet:

www.facebook.com/WizardExhausts
Pud237 is offline  
Reply

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

Tags
156 , 20v , alfa , decat , downpipe , jtd

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