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Author Subject: straight threw on supercharge
pete-gti

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Post #1
Hi guys, I'm running decat with magnex centre section and rear box, I'm think of removing centre box and go straight threw to back box, would there be any gain?. I no it will deff be louder Razz
Posted 23rd Jan 2014 at 00:07
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jamiek_uk2000

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Post #2
A lot of noise, back pressure isn't important on forced induction. Depends on the bore of the system really.

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306 GTi 6 Diablo - Being resurrected! Project Thread

Looking for:
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Posted 23rd Jan 2014 at 00:08
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stan_306gti6 Forum Admin

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Registered: 18 Jan 2004

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Post #3
I have a straight through centre section and I think it's great. Yes

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 23rd Jan 2014 at 00:16
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jamiek_uk2000

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Post #4
What bore is yours Stan 2.5?

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205 GTi Red - G939 RTU - Died!
306 GTi 6 Diablo - Being resurrected! Project Thread

Looking for:
VTS P1 Rack
PR1.2 16"
Posted 23rd Jan 2014 at 00:19
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pete-gti

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Post #5
Would I notice it pull better ?, I believe got 2.25 bore magnex decat and rear box
Posted 23rd Jan 2014 at 01:22
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rallyestyle

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Post #6
To get any real gain out of it you would need to have it custom mapped i would think. I have mine setup as similar as possible to the car that the map was created on.

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Posted 23rd Jan 2014 at 07:58
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pete-gti

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Post #7
Yea I proberly will get it custom mapped at some point, just thought removing middle box it would free it up a bit, might notice a little gain?
Posted 23rd Jan 2014 at 10:19
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pete-gti

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Post #8
Can't decide if get race tube mmmmmm
Posted 23rd Jan 2014 at 20:28
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superchargedblack1997gti6

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Post #9
I wouldn't do it mate trust me it'll be too loud. superchargers do need back pressure remember a turbo is a silencer all of its own in the exhaust. all you can hear on supercharged cars is pressurised air going past the exhaust valves. especially if you go highboost if you still are?

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Posted 23rd Jan 2014 at 20:49
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RetroPug

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Post #10
IMO achieving a nice tone is FAR better than having a high level of noise!

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Posted 23rd Jan 2014 at 21:16
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pete-gti

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Post #11
Wasent so much for noise, just thought might of freed it up a bit, make it pull slighter better


Stan do you notice any difference when you put the middle box back on?
Posted 23rd Jan 2014 at 22:08
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stan_306gti6 Forum Admin

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Post #12
jamiek_uk2000 wrote:
What bore is yours Stan 2.5?


Yep. Yes

________________________________________

"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 23rd Jan 2014 at 22:26
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stan_306gti6 Forum Admin

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Post #13
pete-gti wrote:
Wasent so much for noise, just thought might of freed it up a bit, make it pull slighter better


Stan do you notice any difference when you put the middle box back on?


Yeah, it doesn't quite have the same top end pull with a centre box. Wink

________________________________________

"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 23rd Jan 2014 at 22:27
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pete-gti

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Post #14
So with centre box removed you saying pulls bit better top end? Slightly bit more torque


Where did you get your centre pipe from?
Posted 23rd Jan 2014 at 22:42
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stan_306gti6 Forum Admin

Location: Kent

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Post #15
A slight loss in the mid range with no centre box, better pull up top. Yes

My centre pipe was bespokely made by Zero Exhausts in Ashford, Kent. It cost me £100.

________________________________________

"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 24th Jan 2014 at 10:15
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pugheaven

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Post #16
If your planning in doing track days don't bother removing your centre box
Posted 24th Jan 2014 at 10:46
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eddy_gti6

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Post #17
pugheaven wrote:
If your planning in doing track days don't bother removing your centre box


I agree here. My old 6 was pretty much standard apart from BMC CDA, magnex decat, 2.25" stainless middle section and scorpion back box what got sound tested at croft 98.8db so I am guessing with a charger you can look to have that increased. A lot of tracks have noise limets of 105db.
I must say tho I loved the sound it made Love

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Posted 24th Jan 2014 at 11:30
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stan_306gti6 Forum Admin

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Post #18
I could never run the straight through on track, it registered 132dB. Laugh

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 24th Jan 2014 at 14:35
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russbez

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Post #19
friend sent me this last night Whistle



mine is high boost with a restrictive 2" scorpion system Sad
dread to think how loud 132dB is!!

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Posted 24th Jan 2014 at 15:18
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pete-gti

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Post #20
Catch 22 ain't it, it has its lows and highs, mmmmm
Posted 24th Jan 2014 at 15:18
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