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Author Powerflow Exhaust Question
Greasemonkey
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Registered: 17th Apr 02
Location: Drives a Tractor
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31st Oct 03 at 13:34   View User's Profile U2U Member Reply With Quote

Right gonna book my car in to have two magnex style exhausts fitted one each side, 2 questions what diameter pipe do i need 2 1/4 "??? for the best power gains and can powerflow build the system from my manifold down pipes back, but at the same time building a cat replacement pipe so i can pt the cat back at MOT time
cheers
P.s My cars a GSI if that helps
Noonster
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Registered: 20th Jul 03
Location: East Yorkshire
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31st Oct 03 at 13:42   View User's Profile U2U Member Reply With Quote

Sounds nice - How much is that setting you back?
Daimo B
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Registered: 20th Mar 00
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31st Oct 03 at 13:43   View User's Profile U2U Member Reply With Quote

Arrrrrrrgggggggghhhhhhhhhhh what style

Well, it does depend on your tailpipes. I've only got a 2" system on my 2.0.

I can't remember the rule, but i think its, smaller exhaust bore, more low down torque, less peak power. Bigger exhaust bore, less bottom/mid range torque, but more peak power and faster top end.

Could be why my car seems to pull so well up to 100, but after 120, it really takes its time to get the speed up.
Greasemonkey
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Registered: 17th Apr 02
Location: Drives a Tractor
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31st Oct 03 at 13:43   View User's Profile U2U Member Reply With Quote

Yeah i am hoping it will look the dogs, aint booked it in yet i got 1000 to spend so aint really worried about cost i would think its gonna be about 350-400
Greasemonkey
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Registered: 17th Apr 02
Location: Drives a Tractor
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31st Oct 03 at 13:45   View User's Profile U2U Member Reply With Quote

whats the arrrrrrrrgggggggghhhhhhhh for mate gonna go for the oval style
Gambit
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Registered: 5th Jun 00
Location: Common Sense HQ
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31st Oct 03 at 13:49   View User's Profile U2U Member Reply With Quote

arrrrrrgh unless you get the spare wheel well cut out then only the left exhaust will be used by the gases!! leaving one tarnished and one sparkling new - which shall look a tad daft

it all a matter of science arrrrghhhhhhhhh
ChazSXi
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Registered: 26th Jan 03
Location: Waterlooville, Hampshire
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31st Oct 03 at 13:49   View User's Profile U2U Member Reply With Quote

has any one seen what essexracing.co.uk do now..u can buy two exhausts and they will make them into a dual exit for 150..so u can get two twin 4" slash cut ones for 100 each and then get them to fit it so fir 350 u can do that aswell! also if u just have one xhaust u can get a matching one and the will fit that for you to make a dual exit! p.s u can have the exits where ever u want! side; middle; normal etc!
miles
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Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
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31st Oct 03 at 13:54   View User's Profile U2U Member Reply With Quote

So that would mean a 350 back box.....

My exhaust bore is 2".

If the manifold outlet is 2" then you'll gain nothing from having a bigger system bore.

I have a 2" bore system and make very good power. I might gain a few bhp if I had a bigger bore, but it would be marginal, and would have to be accompanied with a larger bore manifold.

BTW, Powerflow are crap for power.
Daimo B
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Registered: 20th Mar 00
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31st Oct 03 at 13:56   View User's Profile U2U Member Reply With Quote

Arrrrrrrrrggggggggghhhhhhhhh moo cow.

Nahh, im only messin anyway, some buggers already done the exhausts down round this way anyway.

Gambit is correct though Its soo funny when u see it.
Greasemonkey
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Registered: 17th Apr 02
Location: Drives a Tractor
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31st Oct 03 at 14:02   View User's Profile U2U Member Reply With Quote

NO i will get the wheel well cut out that dont bother me, both will be working
Greasemonkey
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Registered: 17th Apr 02
Location: Drives a Tractor
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31st Oct 03 at 14:06   View User's Profile U2U Member Reply With Quote

hang on a minute scorpion do a duel exhaust for the corsa that dont involve removing the wheel well, why carnt powerflow do this, and can any one answer my cat bypass pipe question
Gambit
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Registered: 5th Jun 00
Location: Common Sense HQ
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31st Oct 03 at 14:06   View User's Profile U2U Member Reply With Quote

do u know the science behind it though

arrrrggggghhhh
Daimo B
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Registered: 20th Mar 00
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31st Oct 03 at 14:13   View User's Profile U2U Member Reply With Quote

ha ha, powerflow SHOULD be able to make up a sytem that travels around the spare wheel well, but i odnt think theres enough room to put another rear box in, just the tailpipe. So it would be a system going into the left rear box as normal, with 1 tailpipe, and another pipe that travels back out the rear box and round the well.
Kris TD
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Registered: 25th Mar 02
Location: Ware, Hertfordshire
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31st Oct 03 at 14:17   View User's Profile U2U Member Reply With Quote

thats exact exhaust has been done already, 2 oval magnex backboxs one each side. infact a certain member on here has it.
Greasemonkey
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Registered: 17th Apr 02
Location: Drives a Tractor
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31st Oct 03 at 15:21   View User's Profile U2U Member Reply With Quote

I aint bothered if some on has it of not its what i want i aint gonna stick 10 pipes out the back of me car just cos it aint been done yet, you buy a back box or regular system and just think how many people have the same one i aint trying to be different i just wanted some questions answered
Gambit
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Registered: 5th Jun 00
Location: Common Sense HQ
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31st Oct 03 at 15:35   View User's Profile U2U Member Reply With Quote

just stick with the std bore
Greasemonkey
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Registered: 17th Apr 02
Location: Drives a Tractor
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31st Oct 03 at 15:40   View User's Profile U2U Member Reply With Quote

cheers mate
Dav
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Registered: 23rd Jul 02
Location: Falkirk, Scotland
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31st Oct 03 at 16:05   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Greasemonkey
i aint gonna stick 10 pipes out the back of me car just cos it aint been done yet
Yes that has been done aswell, a Saxo up here has it. Looks horrid
Daimo B
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Registered: 20th Mar 00
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31st Oct 03 at 16:28   View User's Profile U2U Member Reply With Quote

Greasemonkey, yeah i'd go with either a 2" (think the standard is 1 3/4) or 2 1/4" bore. Both will be fine
Greasemonkey
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Registered: 17th Apr 02
Location: Drives a Tractor
User status: Offline
31st Oct 03 at 16:42   View User's Profile U2U Member Reply With Quote

I knew some one was gonna say that Dav
LOL

 
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