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Author Subject: sc exhaust setup?
m306

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Post #1
just wondering what everyones running on their low boost sc cars?

id like to keep mine to a reasonable volume and most importantly road legal, but at the same time dont want to restrict the power. i am tempted to try a sports cat instead of going de-cat, would a sports cat be suitable with the sc? and if so any good ones to recommend?

the rest of the system i was thinking either 2.25 or 2.5 stainless?

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supercharged China gti6 - Thu 16th Sep 1999 - sold
2010 megane rs250
Posted 14th Feb 2012 at 20:59
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cjm_harris

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Post #2
From a flow perspective, i noticed a difference going from a 2.25 to to a 2.5 bore Yes

Noise is a hard one with SC as when you open the throttle, the noise just goes mental Smile

The jetex is meant to be the quiestest for pootling around, with a nice note when you put your foot down Thumbs up

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Chris
1999 China Gti6 Supercharged Devil [Fun car] >>Project Thread<<
2000 Bianca 306 Diesel [Work runabout]
Posted 14th Feb 2012 at 21:17
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m306

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Post #3
cjm_harris wrote:
From a flow perspective, i noticed a difference going from a 2.25 to to a 2.5 bore Yes

Noise is a hard one with SC as when you open the throttle, the noise just goes mental Smile

The jetex is meant to be the quiestest for pootling around, with a nice note when you put your foot down Thumbs up

what was the difference between 2.25 and 2.5? do you mean it was alot louder or that it gave better/worse performance?

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supercharged China gti6 - Thu 16th Sep 1999 - sold
2010 megane rs250
Posted 14th Feb 2012 at 21:20
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cjm_harris

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Post #4
Sorry mate, should of been clearer Doh

Noticed a difference in performance. Seemed to be a lot easier to pick up the revs etc Yes

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Chris
1999 China Gti6 Supercharged Devil [Fun car] >>Project Thread<<
2000 Bianca 306 Diesel [Work runabout]
Posted 14th Feb 2012 at 21:50
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m306

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Post #5
ok thanks chris Smile 2.5 sounds like the better choice then

no worries, im a complete novice with performance exhausts, although ive fitted many ive always gone for genuine pug but obviously cant with the SC.

what have you got in terms of cat?

also how loud is yours? i need to keep mine legal because the cops around my way are very keen on loud cars because we have a big boy racer community

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supercharged China gti6 - Thu 16th Sep 1999 - sold
2010 megane rs250
Posted 14th Feb 2012 at 21:55
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cjm_harris

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Post #6
I have a decat mate, but I know some use a sports cat.

I have a Powerflow system with some fairly big boxes on it. At low throttle openings it sounds basically standard so for pootling round town etc, its very normal and quiet. Put your foot down and open throttle more than half way and noise gets much louder.

There are some measurements in my project thread, will look them out.

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Chris
1999 China Gti6 Supercharged Devil [Fun car] >>Project Thread<<
2000 Bianca 306 Diesel [Work runabout]
Posted 15th Feb 2012 at 09:55
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roland rat

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Post #7
De-cat with a 2.5" system,Job done! Thumbs up
Posted 15th Feb 2012 at 09:57
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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

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Post #8
roland rat wrote:
De-cat with a 2.5" system,Job done! Thumbs up


Agreed. Thumbs up

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 15th Feb 2012 at 11:04
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m306

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Post #9
Are de-cats legal? Unfortunately my daily drive is right past the local police station so have to stay legal

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supercharged China gti6 - Thu 16th Sep 1999 - sold
2010 megane rs250
Posted 15th Feb 2012 at 12:36
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m306

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Post #10
I found your figures on the castle coombe thread Chris, 106db at 5200, I'm guessing that's over the road legal limit?

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supercharged China gti6 - Thu 16th Sep 1999 - sold
2010 megane rs250
Posted 15th Feb 2012 at 12:48
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smegal

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Post #11
If you down the sports cat route, buy an expensive one with a good warranty. SC-6s seem to get through them. I've knackard 2 now.

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Ex SC-6

Now in a Megane R26
Posted 15th Feb 2012 at 14:13
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daveyboy

aka Jim Davey

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Post #12
m306 wrote:
Are de-cats legal? Unfortunately my daily drive is right past the local police station so have to stay legal


Lift off the gas as you go past the cop shop Mark Thumbs up

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Posted 15th Feb 2012 at 14:29
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cjm_harris

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Post #13
m306 wrote:
I found your figures on the castle coombe thread Chris, 106db at 5200, I'm guessing that's over the road legal limit?


That was my previous exhaust mate.

These are my current figures:

Idle: 77 DBa
4500: 87.2 DBa (gentle acceleration)
4500: 90.4 DBa (harder acceleration with opening up throttle more, peaked at 100.2 DBa)
5250: 98.2 DBa

And as far as I know, I dont know what the legal sound limit is, and if there is one, but like I said, while pootling its very quiet. While going past bacon station, just keep the revs down and only use partial throttle and you will be all good Yes

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Chris
1999 China Gti6 Supercharged Devil [Fun car] >>Project Thread<<
2000 Bianca 306 Diesel [Work runabout]
Posted 15th Feb 2012 at 14:58
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m306

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Post #14
smegal wrote:
If you down the sports cat route, buy an expensive one with a good warranty. SC-6s seem to get through them. I've knackard 2 now.

Any recommendations? Or ones to avoid?

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supercharged China gti6 - Thu 16th Sep 1999 - sold
2010 megane rs250
Posted 15th Feb 2012 at 15:03
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m306

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Post #15
daveyboy wrote:
m306 wrote:
Are de-cats legal? Unfortunately my daily drive is right past the local police station so have to stay legal


Lift off the gas as you go past the cop shop Mark Thumbs up

It's at the bottom of a hill leading into a 60 zone so a great place to open it up, but yeah easy on the throttle there would be a solution Smile

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supercharged China gti6 - Thu 16th Sep 1999 - sold
2010 megane rs250
Posted 15th Feb 2012 at 15:07
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smegal

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Post #16
Avoid chaep ones from MIJ performance. To be fair it serves me right for paying £180 for a sports cat. In their defense they replaced it under warranty and gave me another 12month warranty. I just can't be arsed with the hassle of taking it back.

I can't recommend any by experience, but Jetex make good products. I like my exhaust

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Ex SC-6

Now in a Megane R26
Posted 15th Feb 2012 at 15:07
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m306

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Post #17
cjm_harris wrote:
m306 wrote:
I found your figures on the castle coombe thread Chris, 106db at 5200, I'm guessing that's over the road legal limit?


That was my previous exhaust mate.

These are my current figures:

Idle: 77 DBa
4500: 87.2 DBa (gentle acceleration)
4500: 90.4 DBa (harder acceleration with opening up throttle more, peaked at 100.2 DBa)
5250: 98.2 DBa

And as far as I know, I dont know what the legal sound limit is, and if there is one, but like I said, while pootling its very quiet. While going past bacon station, just keep the revs down and only use partial throttle and you will be all good Yes

That's better than I thought they would be, thanks for those figures Chris, that's a big help Thumbs up

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supercharged China gti6 - Thu 16th Sep 1999 - sold
2010 megane rs250
Posted 15th Feb 2012 at 15:09
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m306

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Post #18
smegal wrote:
Avoid chaep ones from MIJ performance. To be fair it serves me right for paying £180 for a sports cat. In their defense they replaced it under warranty and gave me another 12month warranty. I just can't be arsed with the hassle of taking it back.

I can't recommend any by experience, but Jetex make good products. I like my exhaust

Yeah jetex is a name I keep seeing on here, I shall do abit of research on them when I get home tonight

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supercharged China gti6 - Thu 16th Sep 1999 - sold
2010 megane rs250
Posted 15th Feb 2012 at 15:12
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russbez

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Post #19
i havent managed to break my cat back scorpion system in a while, its sounds pretty decent

iirc its a standard one and its only 2inch/50.8mm dia pipe Unsure
iv always got decent rolling road results

think i had already read the answer to my query
rich_w wrote:
2.25” is far too small (for high boost), that’s only really suitable for low-boost.

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Posted 15th Feb 2012 at 15:25
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mrdeey

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Post #20
im running a blue flame with a decat , very quite just poodling ,but floor it and its awesome!

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now new booted , boosted and flying again!
Posted 15th Feb 2012 at 21:20
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stan_306gti6 Forum Admin

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Post #21
Devil Decat, Bespoke straight through centre section and Magnex 4" back box FTW! LOL

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 15th Feb 2012 at 22:29
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m306

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Post #22
stan_306gti6 wrote:
Devil Decat, Bespoke straight through centre section and Magnex 4" back box FTW! LOL

So you've only got 1 box in your system? That must be deafening?

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supercharged China gti6 - Thu 16th Sep 1999 - sold
2010 megane rs250
Posted 16th Feb 2012 at 05:18
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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

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Post #23
m306 wrote:
stan_306gti6 wrote:
Devil Decat, Bespoke straight through centre section and Magnex 4" back box FTW! LOL

So you've only got 1 box in your system? That must be deafening?


Yes, 131dB to be precise. LOL

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 16th Feb 2012 at 14:39
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m306

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Post #24
stan_306gti6 wrote:
m306 wrote:
stan_306gti6 wrote:
Devil Decat, Bespoke straight through centre section and Magnex 4" back box FTW! LOL

So you've only got 1 box in your system? That must be deafening?


Yes, 131dB to be precise. LOL

Holy crap, apparently that's just 9db away from a jet engine at 100 feet and a gunblast according to a website I just looked on. Do you use ear plugs?

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supercharged China gti6 - Thu 16th Sep 1999 - sold
2010 megane rs250
Posted 16th Feb 2012 at 15:08
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velar

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Registered: 04 Jan 2009

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Post #25
m306 wrote:
stan_306gti6 wrote:
m306 wrote:
stan_306gti6 wrote:
Devil Decat, Bespoke straight through centre section and Magnex 4" back box FTW! LOL

So you've only got 1 box in your system? That must be deafening?


Yes, 131dB to be precise. LOL

Holy crap, apparently that's just 9db away from a jet engine at 100 feet


yeh but +9db is 8 times as loud, and 100 feet is 30db loss in air!!! So a jet engine at 1 foot is 170dB ( or 10000 times louder than his exhaust) (edit as I dropped a decimal place)

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L reg "black and blue" phase 1 track 6
Posted 16th Feb 2012 at 15:44
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