4 branch manifold and decat - Corsa Sport - for Vauxhall and Opel Corsa B, Corsa C and Corsa D

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pavorotti

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Registered: 20th Jan 05
Location: west mids
User status: Offline

6th Feb 05 at 23:02

does this make much difference to sound and acceleration?

Joff

Member

Registered: 17th Oct 00
Location: Cambridgeshire
User status: Offline

6th Feb 05 at 23:03

A decat will make your exhaust louder, a good manifold will improve performance in the low-mid range.

pavorotti

Member

Registered: 20th Jan 05
Location: west mids
User status: Offline

6th Feb 05 at 23:12

gonna pay about 150 4 manifold? and decat regains more power which normal cat stops yes thats about 5 percent? is that right?

Joff

Member

Registered: 17th Oct 00
Location: Cambridgeshire
User status: Offline

7th Feb 05 at 02:40

Decat won't make any noticeable difference to power gains.
Spend double on the manifold and get something that actually works. I doubt you'll find anywhere selling decent manifolds for £150.

broster

Premium Member

Registered: 6th Dec 02
Location: Drives: E39
User status: Offline

7th Feb 05 at 08:32

my manifold cost over doule what your willing to pay, depends what you want from it, spend more and get a better one.

Ajones_17

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Registered: 20th Jun 02
Location: Sunny Wigan Drives: BLACK 03 VTS
User status: Offline

7th Feb 05 at 15:35

Is the Janspeed manifold any good, it's £180. I've got the full Janspeed system with De-Cat and was thinkin of getting the Janspeed manifold too but wasn't sure if it was worth it.

broster

Premium Member

Registered: 6th Dec 02
Location: Drives: E39
User status: Offline

7th Feb 05 at 15:47

yes its mild steel not stainless, but that dosent mean mush really!

James R

Member

Registered: 4th Feb 03
Location: 205GTi16/306GTi16
User status: Offline

7th Feb 05 at 19:52

quote:
Originally posted by Joff
A decat will make your exhaust louder, a good manifold will improve performance in the low-mid range.

Isn't it in th emid upper range where the std manifold becomes restrictive??

pavorotti

Member

Registered: 20th Jan 05
Location: west mids
User status: Offline

7th Feb 05 at 20:20

was gonna get sportex manifold and its made from mild steel 160!

Joff

Member

Registered: 17th Oct 00
Location: Cambridgeshire
User status: Offline

7th Feb 05 at 21:35

quote:
Originally posted by j1400

quote:
Originally posted by Joff
A decat will make your exhaust louder, a good manifold will improve performance in the low-mid range.

Isn't it in th emid upper range where the std manifold becomes restrictive??

Std manifold is pretty good anyway, but a decent exhaust builder should be able to tune the power so it's useable.

James R

Member

Registered: 4th Feb 03
Location: 205GTi16/306GTi16
User status: Offline

7th Feb 05 at 22:22

16v engines don't have a low end though?? It's ok on a stdish engine, but on TB's you need a decent one to get the power out of them. As SBD state on the site.

Joff

Member

Registered: 17th Oct 00
Location: Cambridgeshire
User status: Offline

8th Feb 05 at 08:08

quote:
Originally posted by j1400
16v engines don't have a low end though??

So what, when you rev the car literally doesn't move until you get past 3k ?

broster

Premium Member

Registered: 6th Dec 02
Location: Drives: E39
User status: Offline

8th Feb 05 at 08:22

yes joff thats exactly what happens

Ajones_17

Member

Registered: 20th Jun 02
Location: Sunny Wigan Drives: BLACK 03 VTS
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8th Feb 05 at 16:17

So with a new manifold like the Janspeed one it's not gonna bring the power curve lower down just prodce more power in general.

James R

Member

Registered: 4th Feb 03
Location: 205GTi16/306GTi16
User status: Offline

8th Feb 05 at 20:08

quote:
Originally posted by Joff

quote:
Originally posted by j1400
16v engines don't have a low end though??

So what, when you rev the car literally doesn't move until you get past 3k ?

What Broster said

No but they don't pull well at low rpms, they only start to come in at 4k properly.

James R

Member

Registered: 4th Feb 03
Location: 205GTi16/306GTi16
User status: Offline

8th Feb 05 at 20:09

quote:
Originally posted by Ajones_17
So with a new manifold like the Janspeed one it's not gonna bring the power curve lower down just prodce more power in general.

It will improve the midrange and top end revs of the car,

Joff

Member

Registered: 17th Oct 00
Location: Cambridgeshire
User status: Offline

8th Feb 05 at 21:36

quote:
Originally posted by broster
yes joff thats exactly what happens

Shocking, quite literally shocking.

Unless you're just agreeing with me in a patronising tone of text...

broster

Premium Member

Registered: 6th Dec 02
Location: Drives: E39
User status: Offline

9th Feb 05 at 07:17

quote:
Originally posted by Joff

quote:
Originally posted by broster
yes joff thats exactly what happens

Shocking, quite literally shocking.

Unless you're just agreeing with me in a patronising tone of text...

its totally true joff. ask any racer.....any real racer and hell tellyou 16v's are 16vs, theres no power below 3k.......

Joff

Member

Registered: 17th Oct 00
Location: Cambridgeshire
User status: Offline

9th Feb 05 at 08:59

Just got off the phone with Barichello and he agrees. He said 8v is the way forward.

broster

Premium Member

Registered: 6th Dec 02
Location: Drives: E39
User status: Offline

9th Feb 05 at 09:45

I agree, id even guess that 4v is better than 8v......

Siberia

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Registered: 9th Oct 03
Location: Leprechaun Land Drives : Zafira GSI
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