SC exhaust help - Exhausts Forum - Peugeot 306 GTi-6 & Rallye Owners Club

displaying posts 26 to 50 of 130

Pages (6): 1 [2] 3 .. last

Author

Subject: SC exhaust help

manthos

Seasoned Pro

Location: Norwich

Registered: 29 Apr 2009

Posts: 1,966

Status: Offline

Post #26

marco gti6 wrote:

Well if you do ditch it let me know if you are selling the center box and the decat mate

Ok. I would keep the magnex decat but I would sell the complete jetex centre and backbox as one pal, if yours pops and bangs it's likely you've blown the baffles out?

Think I'll make up a custom exhaust and think I'll use a Varex back box because at the push of a button it's chambered or straight through. has a butterfly valve. clever Australian company

________________________________________

Team SUPERCHARGED

Ninja

I LIVE FOR THE 306 Ninja

Old Project thread

Clicky: [url =http://www.306gti6.com]click here[/url] remove the space between [url =

Posted 13th May 2016 at 09:18

Profile

manthos

Seasoned Pro

Location: Norwich

Registered: 29 Apr 2009

Posts: 1,966

Status: Offline

Post #27

So update guys. got the am car on the Rollers and with the jetex which has a chambered back box and as mentioned the bottom of the decat steps down to 2.25 it produced 231bhp exactly what it produced when Ash (Roland Rat) got it done with a standard cat and exhaust. so I come the the conclusion the jetex is definitely restrictive however don't know what will give the best results

1. have a 2.5" bore all the way through (cut off the bottleneck at the bottom of the decat) with a straight through back box

or

2. a 3" system with straight through back box

________________________________________

Team SUPERCHARGED

Ninja

I LIVE FOR THE 306 Ninja

Old Project thread

Clicky: [url =http://www.306gti6.com]click here[/url] remove the space between [url =

Posted 20th May 2016 at 21:25

Profile

allye

Regular

Location: Devizes

Registered: 05 May 2011

Posts: 204

Status: Offline

Post #28

Get a 2.5' system for it, that's what my 306 had and it was a known strong setup.

________________________________________

205 Van SC'd GTI6 - because why not
309 Goodwood V6 - sold
205 Rallye GTI6 - Bent

Posted 21st May 2016 at 13:34

Profile

manthos

Seasoned Pro

Location: Norwich

Registered: 29 Apr 2009

Posts: 1,966

Status: Offline

Post #29

What bhp did you get? mine has very good clean and healthy power curve iD just like to get a bit closer to 250bhp

________________________________________

Team SUPERCHARGED

Ninja

I LIVE FOR THE 306 Ninja

Old Project thread

Clicky: [url =http://www.306gti6.com]click here[/url] remove the space between [url =

Posted 21st May 2016 at 14:05

Profile

Day666

Seasoned Pro

Location: Bristol

Registered: 20 Apr 2013

Posts: 5,214

Status: Offline

Post #30

Just go careful spending out money if you plan on doing a track day or two ..

I've got a issue now where I need a 2.75-3.00inch from Maniflow manifold 4-2-1 back according to Sandy & I'm running a 2.5 Magnex now with two big boxes & its 89db with my old standard engine ....the exhaust guy mentioned that if I go 3inch same as I got now it will go upto 95-97dbs with my old standard engine ....So what the hell am I going to do with the new engine ?
I'm thinking two huge boxes mid & end straight through .... Crazy

Hope do decide wisely m8 ....

PS ECU gone m8 .

Posted 22nd May 2016 at 00:07

Profile

manthos

Seasoned Pro

Location: Norwich

Registered: 29 Apr 2009

Posts: 1,966

Status: Offline

Post #31

s**t sorry forget to get back to you. I've been told no point getting ecu for low boost not worth it.

so why do you need 2.75"-3" for power?

________________________________________

Team SUPERCHARGED

Ninja

I LIVE FOR THE 306 Ninja

Old Project thread

Clicky: [url =http://www.306gti6.com]click here[/url] remove the space between [url =

Posted 22nd May 2016 at 00:12

Profile

manthos

Seasoned Pro

Location: Norwich

Registered: 29 Apr 2009

Posts: 1,966

Status: Offline

Post #32

I want whatever bore size gives best results

________________________________________

Team SUPERCHARGED

Ninja

I LIVE FOR THE 306 Ninja

Old Project thread

Clicky: [url =http://www.306gti6.com]click here[/url] remove the space between [url =

Posted 22nd May 2016 at 00:13

Profile

welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,838

Status: Offline

Post #33

go to a decent exhaust man and let them loose.

someone like edwards motorsport.

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Posted 22nd May 2016 at 00:56

Profile

Day666

Seasoned Pro

Location: Bristol

Registered: 20 Apr 2013

Posts: 5,214

Status: Offline

Post #34

manthos wrote:

s**t sorry forget to get back to you. I've been told no point getting ecu for low boost not worth it.

so why do you need 2.75"-3" for power?

I don't know it's what Sandy told me Friday Whistle

Posted 22nd May 2016 at 03:40

Profile

Day666

Seasoned Pro

Location: Bristol

Registered: 20 Apr 2013

Posts: 5,214

Status: Offline

Post #35

welshpug! wrote:

go to a decent exhaust man and let them loose.

someone like edwards motorsport.

Mikes one of the best & I love him dearly BUT ....not cheap & I haven't got that kind of money at the mo .......it's on my Mike Edwards bucket list ....Mikes manifolds to Sandy design is better than my old Maniflow & Full system Thumbs up

Posted 22nd May 2016 at 09:55

Profile

luke306rallye

Regular

Location: Rotherham

Registered: 13 Sep 2010

Posts: 310

Status: Offline

Post #36

Only need 2.5" for high boost, low boost should be the same.
Birk made about 272bhp low boost iirc years ago.

Posted 22nd May 2016 at 09:22

Profile

Day666

Seasoned Pro

Location: Bristol

Registered: 20 Apr 2013

Posts: 5,214

Status: Offline

Post #37

luke306rallye wrote:

Only need 2.5" for high boost, low boost should be the same.
Birk made about 272bhp low boost iirc years ago.

I personally believe your spot on Luke & the bigger the bore (NOT) on full chat it sold horrendous....but that's just me & ive got to keep my car for Combe on max 100db at 4000 ...

Sandy tells me different....but this car remember is not S/C .....Mine is N/A fire breathing 280+ at the flywheel Jenvey engined SAndy full on 100% race engine ...so I guess Its a totally diff thing & who am I to say Sandys wrong LOL

I think you should spend your money on something different if you already have a 2.5 Mangex ...lovely system Thumbs up

Posted 22nd May 2016 at 10:03

Profile

manthos

Seasoned Pro

Location: Norwich

Registered: 29 Apr 2009

Posts: 1,966

Status: Offline

Post #38

I have a 2.5 jetex and the problem is the rear box is chambered

I have been recommended a great exhaust place (pipe craft in basildon) but what I wanted to know was what people have found is the most efficient bore for power on a low boost so then I can get that size made up. because there will be an optimum bore size and I was wondering if people on here had found out what that was so I don't have to get a 2.5 a 2.75 and a 3 made a RR all of them as that would be stupidly expensive

________________________________________

Team SUPERCHARGED

Ninja

I LIVE FOR THE 306 Ninja

Old Project thread

Clicky: [url =http://www.306gti6.com]click here[/url] remove the space between [url =

Posted 22nd May 2016 at 10:15

Profile

manthos

Seasoned Pro

Location: Norwich

Registered: 29 Apr 2009

Posts: 1,966

Status: Offline

Post #39

luke306rallye wrote:

Only need 2.5" for high boost, low boost should be the same.
Birk made about 272bhp low boost iirc years ago.

was that with a 2.5 system?

________________________________________

Team SUPERCHARGED

Ninja

I LIVE FOR THE 306 Ninja

Old Project thread

Clicky: [url =http://www.306gti6.com]click here[/url] remove the space between [url =

Posted 22nd May 2016 at 10:15

Profile

luke306rallye

Regular

Location: Rotherham

Registered: 13 Sep 2010

Posts: 310

Status: Offline

Post #40

manthos wrote:

luke306rallye wrote:

Only need 2.5" for high boost, low boost should be the same.
Birk made about 272bhp low boost iirc years ago.

was that with a 2.5 system?

Yep, pretty sure it was a custom 2.5" powerflow system.

Posted 22nd May 2016 at 10:31

Profile

welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,838

Status: Offline

Post #41

if you want something that works you need to discount sll the high street exhaust places, all they do is weld in what fits.

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Posted 22nd May 2016 at 10:41

Profile

manthos

Seasoned Pro

Location: Norwich

Registered: 29 Apr 2009

Posts: 1,966

Status: Offline

Post #42

welshpug! wrote:

if you want something that works you need to discount sll the high street exhaust places, all they do is weld in what fits.

What do you mean? If I have the knowledge of what size will work then I will get that size made up. If for example 2.5" straight through is the best then I will get the reduced section at the bottom of the decat cut off and will have a full 2.5 straight through to the back with 2 straight through boxes in

________________________________________

Team SUPERCHARGED

Ninja

I LIVE FOR THE 306 Ninja

Old Project thread

Clicky: [url =http://www.306gti6.com]click here[/url] remove the space between [url =

Posted 22nd May 2016 at 10:50

Profile

welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,838

Status: Offline

Post #43

you wont find powerflow on a race car...

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Posted 22nd May 2016 at 15:19

Profile

manthos

Seasoned Pro

Location: Norwich

Registered: 29 Apr 2009

Posts: 1,966

Status: Offline

Post #44

The pipe craft place make everything including the boxes from scratch

________________________________________

Team SUPERCHARGED

Ninja

I LIVE FOR THE 306 Ninja

Old Project thread

Clicky: [url =http://www.306gti6.com]click here[/url] remove the space between [url =

Posted 22nd May 2016 at 15:38

Profile

fatlapit

Seasoned Pro

Location: STOCKSFIELD

Registered: 02 Nov 2010

Posts: 3,040

Status: Offline

Post #45

Use propper boxes from flowmaster at 2.5" ull have no problems

________________________________________

Posted 22nd May 2016 at 18:15

Profile

manthos

Seasoned Pro

Location: Norwich

Registered: 29 Apr 2009

Posts: 1,966

Status: Offline

Post #46

Are flow master straight through the ones I saw photos of did not look it

________________________________________

Team SUPERCHARGED

Ninja

I LIVE FOR THE 306 Ninja

Old Project thread

Clicky: [url =http://www.306gti6.com]click here[/url] remove the space between [url =

Posted 22nd May 2016 at 18:18

Profile

welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,838

Status: Offline

Post #47

3" is enough for over 300 bhp, but the bore is only one part of a very big jigsaw puzzle

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Posted 22nd May 2016 at 20:50

Profile

phillipm

Seasoned Pro

Location: Rotherham

Registered: 15 Oct 2006

Posts: 20,607

Status: Offline

Post #48

manthos wrote:

The pipe craft place make everything including the boxes from scratch

Usually just welded up from pre-sized shapes and pieces, rather than shaped and fitted to the exhaust/cam dynamics.

If they don't ask what your valve timings, C:R and rev limit is and then spend an hour doing sums first, then they're just slapping generic off the shelf bits together.
It's not as simple as 'this bore is the best' as it depends how the rest of the system is made too - 2.5" should be fine for almost 300bhp on a decent system, on something badly designed it might need 2.75-3" to flow the same.

________________________________________

- Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM me
Email me!
Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces.

Posted 22nd May 2016 at 21:02

Profile

fatlapit

Seasoned Pro

Location: STOCKSFIELD

Registered: 02 Nov 2010

Posts: 3,040

Status: Offline

Post #49

Flow master are chambered boxes but zero flow loss. They are expensive but worth every penny. I use 2 dbx boxes they are quiet and un restrictive. Obviously to a point

________________________________________

Posted 22nd May 2016 at 22:03

Profile

roland rat

Yeeeah Rat fans!

Location: Swansea

Registered: 29 Nov 2006

Posts: 22,284

Status: Offline

Post #50

I'd be looking at the boost pipes before an exhaust if it was me

Posted 22nd May 2016 at 22:11

Profile

Pages (6): 1 [2] 3 .. last

All times are GMT. The time is now 13:36

Please Note: The views and opinions found herein are those of individuals, and not of The Peugeot 306 GTi-6 & Rallye Owners Club or any individuals involved.
No responsibility is taken or assumed for any comments or statements made on, or in relation to, this website. Please see our updated privacy policy.