exhaust diameter ???

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exhaust diameter ??? #1562347 01/02/2016 22:00 01/02/2016 22:00
S Sean0711 Unregistered
Sean0711 Unregistered S	hi Guys, I have a 20VT and am looking to tune it up to around 300-350BHP i have a question about the exhaust though i no i will need to run a 3 inch down pipe off the turbo but will the rest of the exhaust be ok as a 2.25 inch as i already have a sports cat and complete system in 2.25 inch pipe. and wanted to keep it if i could any help or advice would be great! thanks in advance. Sean.

Re: exhaust diameter ??? [Re: ] #1562367 02/02/2016 00:35 02/02/2016 00:35
Joined: Dec 2007 Posts: 2,252 Windsor/ Reading knight7660 Competition Level
knight7660 Competition Level Joined: Dec 2007 Posts: 2,252 Windsor/ Reading	2.75 inch downpipe will reach that power figure but 2.25 system will strangle it alittle Last edited by knight7660; 02/02/2016 00:35. LE53 (452BHp & 389ftlb's with Quaife) Wine red VIS FOOFY Audi RS4 B7

Re: exhaust diameter ??? [Re: ] #1562426 02/02/2016 17:00 02/02/2016 17:00
S Sean0711 Unregistered
Sean0711 Unregistered S	Thanks for the input Knight7660 the system I have is completely unrostricted and high flow. Basically the system I have is on a Alfa GTV and I am swapping the engine from the coupe into the GTV and the exhaust system I have on the Alfa cost an absolute mint. It's made by a company called Alfaholics and I wanted to keep as much of it as I can. http://www.alfaholics.com/browse-parts-b...system-cf3-126/

Re: exhaust diameter ??? [Re: ] #1562429 02/02/2016 17:17 02/02/2016 17:17
Joined: Dec 2005 Posts: 12,295 Sandhurst Begbie Ex El Presidente
Begbie Ex El Presidente I AM a Coop Joined: Dec 2005 Posts: 12,295 Sandhurst	Why not sell the system on and get a 3" made up? I seem to remember 'Nigel' on here, for a long time, ran with a 3" downpipe and a 2.25" for the rest of the exhaust and whilst it made the power he wanted at the time, it was a restriction as when he went 3" all the way, he freed up quite a lot of BHP and possibly torque. Ok, lets look at it the other way. What happens if you decide to keep the Alfaholics exhaust system and then decide at a later date you want more power? You've then got the added expense of having to get the downpipe re-fabricated and then a full 3" system, whereas you could have done that in the first place and not spent so much money? Originally Posted by Jonny - After being taken out at Spa Your car is Usain Bolt with wellies

Re: exhaust diameter ??? [Re: Begbie] #1562463 02/02/2016 22:33 02/02/2016 22:33
S Sean0711 Unregistered
Sean0711 Unregistered S	Originally Posted By: Begbie Why not sell the system on and get a 3" made up? I seem to remember 'Nigel' on here, for a long time, ran with a 3" downpipe and a 2.25" for the rest of the exhaust and whilst it made the power he wanted at the time, it was a restriction as when he went 3" all the way, he freed up quite a lot of BHP and possibly torque. Ok, lets look at it the other way. What happens if you decide to keep the Alfaholics exhaust system and then decide at a later date you want more power? You've then got the added expense of having to get the downpipe re-fabricated and then a full 3" system, whereas you could have done that in the first place and not spent so much money? fair point Begbie, looks like i will get rid of the system and just go for a full 3'' system to release its most potential. at least i can have it made with an identical tip so it looks the same at least. thanks.

Re: exhaust diameter ??? [Re: ] #1562766 06/02/2016 10:38 06/02/2016 10:38
J Jonscoupe Unregistered
Jonscoupe Unregistered J	Not an expert in any shape or form but is bigger necessarilly better? Exhausts I mean of course!

Re: exhaust diameter ??? [Re: ] #1562772 06/02/2016 11:13 06/02/2016 11:13
Joined: Sep 2006 Posts: 17,227 FCSS 01684 593187 Countrycruising Club Rep Europe, member 914
Countrycruising Club Rep Europe, member 914 Forum veteran Joined: Sep 2006 Posts: 17,227 FCSS 01684 593187	Originally Posted By: Jonscoupe Not an expert in any shape or form but is bigger necessarilly better? Exhausts I mean of course! The quicker you can get the exhaust gases out, the quicker you can get the air in, so size and flow does matter with forced induction. www.facebook.com/fiatcoupes

Re: exhaust diameter ??? [Re: ] #1563103 10/02/2016 00:31 10/02/2016 00:31
D DorianStiglic Unregistered
DorianStiglic Unregistered D	Just a quick tip i had a original exhaust on my Audi 3.0v6tdi measured power after remap was 300hp dpf delete + standart exhaust changed exhaust with 80mm original is 65mm with 2 fre flow muflers 322 hp measured after so thats on car that goes only to 4500rpm imagine restriction on engine that goes to 7500rpm

Re: exhaust diameter ??? [Re: ] #1563206 10/02/2016 21:55 10/02/2016 21:55
Joined: Sep 2015 Posts: 45 italy P pippoinzaghi Discoverer
pippoinzaghi Discoverer P Joined: Sep 2015 Posts: 45 italy	3" ... are you talking about i.d. or e.d.?

Re: exhaust diameter ??? [Re: ] #1563210 10/02/2016 22:22 10/02/2016 22:22
Joined: Aug 2006 Posts: 1,904 Poland deannn_20VT My life on the forum
deannn_20VT My life on the forum Joined: Aug 2006 Posts: 1,904 Poland	3" ID. www.jacksonracing.pl

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