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Corsa Sport » Message Board » General Chat » can someone shine some light on this please..(exhaust question)


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Author can someone shine some light on this please..(exhaust question)
Minty_Fresh
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Registered: 1st May 08
Location: westmidlands
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   13th Jun 08 at 13:50   View User's Profile U2U Member Reply With Quote
do i need a backbox on my car...

not asin take it off so the exhaust ends at the rear beam.., but not have a backbox and just have the exhaust all the way back with a tailpipe on the end if you know what i mean..
Corsa_Sport21
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Registered: 13th Apr 08
Location: Leven, Fife. Drives : 205 GTi
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13th Jun 08 at 13:51   View User's Profile U2U Member Reply With Quote
Yes but without a middle box itl be very loud.
My old Pulsar had a turbo back mongoose system with only 1 middle box and no rear box.Just the way the system is designed.
Colin
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Registered: 4th Apr 02
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13th Jun 08 at 13:55   View User's Profile U2U Member Reply With Quote
Might loose some power, the backbox aids giving a back pressure r something, making the engine run right.
Minty_Fresh
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Registered: 1st May 08
Location: westmidlands
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13th Jun 08 at 14:41   View User's Profile U2U Member Reply With Quote
cheers for that guys..
neil h
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Registered: 28th Sep 06
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13th Jun 08 at 14:49   View User's Profile U2U Member Reply With Quote
IIRC the back pressure thing is an urban myth and only really true on turbo'd cars where you need the back pressure to prevent the turbo over spooling.
Minty_Fresh
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Registered: 1st May 08
Location: westmidlands
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13th Jun 08 at 14:53   View User's Profile U2U Member Reply With Quote
its a 1.0 12v anyway..

but ive heard that they do need backpressure to run right..
Matt L
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Registered: 17th Apr 06
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13th Jun 08 at 14:57   View User's Profile U2U Member Reply With Quote
yeh you can go with no back box and just the tip quite a few people on scn have done it with tdi cars just to get the noise. does affect perfomance though
Minty_Fresh
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Registered: 1st May 08
Location: westmidlands
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13th Jun 08 at 14:59   View User's Profile U2U Member Reply With Quote
im not doing it for the noise or performance..

just want to get rid of the backbox so i can lower it even more..
ed
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Registered: 10th Sep 03
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13th Jun 08 at 15:00   View User's Profile U2U Member Reply With Quote
Back pressure is a load of bollocks, well, unless you have a two stroke engine which has no valves so needs it. Don't need it on a turbo engine and don't need it on a normaly aspirated engine either.

I wouldn't run a car with no back box though, unless it was a specific exhaust design. It would be really loud and probably sound like a fart.
ed
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Registered: 10th Sep 03
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13th Jun 08 at 15:01   View User's Profile U2U Member Reply With Quote
You can get different shaped back boxes that will allow you to lower the car more if you like. But if you're going that low you're going to mess up the handling like crazy.
FruitBooTeR
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Registered: 18th Jan 07
Location: Wolverhampton Drives: S15
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13th Jun 08 at 15:08   View User's Profile U2U Member Reply With Quote
What backbox you got on standard?

Go for an aftermarket one, the backbox should clear rear beam completly anyway, its the actualy exhaust pipe that will hit off it when lowerd to the extreme, but this can also be modified to clear it
Minty_Fresh
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Registered: 1st May 08
Location: westmidlands
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13th Jun 08 at 15:44   View User's Profile U2U Member Reply With Quote
ive got a 6x4 backbox..

the tailpipe design is fine its just the size of the backbox itself that sits low...

clears the rear beam fine...
GT190
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Registered: 6th Dec 07
Location: Greater London
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13th Jun 08 at 16:06   View User's Profile U2U Member Reply With Quote
get a smaller backbox, mine is long and thin.
S@M
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Registered: 3rd Oct 07
Location: East Yorkshire
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13th Jun 08 at 16:12   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by GT190
get a smaller backbox, my penis is long and thin.
Minty_Fresh
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Registered: 1st May 08
Location: westmidlands
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13th Jun 08 at 16:14   View User's Profile U2U Member Reply With Quote
lol..

i would just buy a cheap 2nd hand backbox if the backbox was small so i could weld the tailpipe ive got into it...
GT190
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Registered: 6th Dec 07
Location: Greater London
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13th Jun 08 at 16:17   View User's Profile U2U Member Reply With Quote
im getting my tiny center silencer cut out 2mro to straight through my exhuast.

you could use that?
Corsa_Sport21
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Registered: 13th Apr 08
Location: Leven, Fife. Drives : 205 GTi
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13th Jun 08 at 20:15   View User's Profile U2U Member Reply With Quote
Yep this back pressure causing a car too loose power is bull.
My old pulsar without a backbox made 313bhp at 17psi.

 
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