MoNkEy MaGiC
Member
Registered: 12th Apr 03
Location: West - London Drives: Corsa GSi
User status: Offline
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hi guys, ive got a corsa 1.6 16v Gsi, ive recently fitted a full group A exaust system 
ive heard that a Group A system will actually reduce acceleration, is this true???
Anyone else here with a Group A exaust, and what have u noticed???
as ive not really felt any loss in acceleration if anything a slight increase, the car also feels much smoother through the revs now!
please help, thanks 
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dousey
Member
Registered: 21st May 03
Location: Selsey, West Sussex
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Yeah i have heard that the grp a systems reduce power unless the engine is heavily modified so it needs a bigger bore exhaust to get exhaust gasses out of the engine quicker.
Not sure if i am right on this one but i think so?
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Makarus
Member
Registered: 25th Jun 02
Location: Nottingham/Derbyshire Boarder.
User status: Offline
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From what I know a Group A system is like dousey said for highly modified engines, a standard 1.6 16V wont need that kinda system so you should loose acceleration because the back pressure will be lost.
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JJ
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Registered: 20th Apr 00
Location: Northern Ireland
User status: Offline
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I've got a 1.6 16v sport with the scorpion group a system no cat and some sly engine work  the system wont make the car any slower as standard, it will slightly increase torque and feel smoother, wont do anything for your fuel economy either lol, run the car as much as possible on super unleaded as it has a higher octain level and the engine should run really well, as for the increased bore, that is only after the centre box anyway, so all it does is clear the exhaust gases slightly quicker as its leaving after the centre box. oh yes, and gives a nice note
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miles
Member
Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
User status: Offline
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A bore that is too big will reduce torque.
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big eck
Member
Registered: 20th Apr 03
Location: Tullibody. Drives - Audi B8 S4 & Fiesta Zetec-S
User status: Offline
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I've got a full group a system, de-catted and 4 branch manifold zorst on ma car and it makes a big difference, adds about another 5-10bhp. Put a set of cams in your car and get the head reworked you;ll notice big gains then.
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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iv got a grp a system on my car with viper an lexmaul inlet, the zorst sounds nice an made the car rev better an a slight improvment in acceleration, nuffin amazin but its noticable! as JJ said its after the middle box that its gets to grp a bore so its hardly gunna make that much difference, next up is cams an a chip!
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MoNkEy MaGiC
Member
Registered: 12th Apr 03
Location: West - London Drives: Corsa GSi
User status: Offline
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my cars just got the group A exaust and a KnN induction kit so far.
im getting the viper very soon too!
"Broster" ive got similar mods to you, what will i notice a different between the viper and my old KnN on my Gsi, in terms of sound and performance???
cheers guys
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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sounds a bit quieter but the k&n is a deaper note than the viper, the viper is a better note i fink, slightly raspy an howls at 6-6500. performance is better aswell, itll be noticable, give more low down torque than the k&n. worth it for the money
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MoNkEy MaGiC
Member
Registered: 12th Apr 03
Location: West - London Drives: Corsa GSi
User status: Offline
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which corsa do u have mate?
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Kris TD
Member
Registered: 25th Mar 02
Location: Ware, Hertfordshire
User status: Offline
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grp a as said is too big for an otherwise standard engine, 2 1/2 inch is what i would use on my turbo cos i actually want to decrease back pressure whereas you dont want to loose it.
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Adam
Member
Registered: 1st May 01
Location: Hurstbourne Tarrant
User status: Offline
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cos after the turbo you want rid off the gas as soon as possible
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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got the 1.4 16v
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