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Author back pressure
Mertin
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Registered: 12th Oct 05
Location: Scotland
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10th Mar 06 at 00:13   View User's Profile U2U Member Reply With Quote
whats the deal with back pressure on corsas?

when peoples talking about de cats iv heard them mention about the back pressure? how much does it matter?

thinking of getting a stright through cat back exhaust but i thoghut seeing as so many people have them surely it doesnt matter so much?
Paul_J
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Registered: 6th Jun 02
Location: London
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10th Mar 06 at 00:13   View User's Profile U2U Member Reply With Quote
I doubt it'll make much difference on a 1.2 8v.
Paul_J
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Registered: 6th Jun 02
Location: London
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10th Mar 06 at 00:16   View User's Profile U2U Member Reply With Quote
This is the power my 1.2 16v made with a straight through sebring exhaust system (with cat in place)
Mertin
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Registered: 12th Oct 05
Location: Scotland
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10th Mar 06 at 00:22   View User's Profile U2U Member Reply With Quote
not worried about power, its a 1.2 8v so bot going to get much

just a better sound, so the revs dont have to be sky high to get a note

buying a universal induction kit this weekend to try and improve the note
Paul_J
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Registered: 6th Jun 02
Location: London
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10th Mar 06 at 00:25   View User's Profile U2U Member Reply With Quote
yeh should be alright then - remove the center section (i.e. replace center pipe) and get a back box and it'll sound a lot louder / deeper.

I wouldn't worry about losing back pressure it won't remove that much restriction.
Mertin
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Registered: 12th Oct 05
Location: Scotland
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10th Mar 06 at 00:26   View User's Profile U2U Member Reply With Quote
ok, just hadnt a clue what back pressure was and how much effect it had but it doesnt seem a biggy

would the 1.2 8v be bad for emissions without a cat?
Paul_J
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Registered: 6th Jun 02
Location: London
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10th Mar 06 at 00:31   View User's Profile U2U Member Reply With Quote
why you replacing the cat if your not bothered about performance? most straight through center pipes are cat back.

removing the cat will give a rasp noise. You want a nice deep burble noise, which the 1.2 8v makes when you remove the silencer.

little article about back pressure

http://www.uucmotorwerks.com/html_product/sue462/backpressuretorquemyth.htm
Mertin
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Registered: 12th Oct 05
Location: Scotland
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10th Mar 06 at 00:32   View User's Profile U2U Member Reply With Quote
needing a better exahust note, so was going to think about getting a straight through exahust and taking the cat out
Paul_J
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Registered: 6th Jun 02
Location: London
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10th Mar 06 at 00:38   View User's Profile U2U Member Reply With Quote
just get the straight through exhaust (center pipe cat back) and leave the cat in. Only real reason people remove cats is to gain power.

that is unless your going for a rally style sound - raspy as fuck like a fart noise.
Mertin
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Registered: 12th Oct 05
Location: Scotland
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10th Mar 06 at 00:43   View User's Profile U2U Member Reply With Quote
maybe no if itl sound rough, ever heard a corsa sport with a straight through exahust? love that noise and want something like that but not sure if il get it with a 1.2 8v

just have to see if the local exhaust/steel place can work their magic
Mertin
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Registered: 12th Oct 05
Location: Scotland
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10th Mar 06 at 00:44   View User's Profile U2U Member Reply With Quote
most il get from a de cat would be 5bhp maybe? will the difference be noticeable?
Jas
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Registered: 13th Oct 04
Location: Mid Wales
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10th Mar 06 at 00:51   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Mertin
most il get from a de cat would be 5bhp maybe? will the difference be noticeable?


doubtful mate...
i wanted to make my 1.2 faster aswell...

so i dropped a x16xe in it
Paul_J
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Registered: 6th Jun 02
Location: London
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10th Mar 06 at 00:53   View User's Profile U2U Member Reply With Quote
all you need to improve the sound - since you've already got a backbox, is a center pipe for about £60.

This goes inbetween your cat and backbox and replaces the silencer that is currently there.
Mertin
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Registered: 12th Oct 05
Location: Scotland
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10th Mar 06 at 00:56   View User's Profile U2U Member Reply With Quote
cool, cheers for the info. think il go for centra section and taking out the silencer

is it me or do you get more replies and people take more notice if your a premium member lol. posts are more noticeable with a pic mind you
Paul_J
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Registered: 6th Jun 02
Location: London
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10th Mar 06 at 00:58   View User's Profile U2U Member Reply With Quote
http://www.motorsportworld.co.uk/detProd.asp?ProductCode=SB-985854-SR&PID=283869

Here you go. Motorsportworld are good too - but this is the center pipe I had on my car.
Paul_J
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Registered: 6th Jun 02
Location: London
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10th Mar 06 at 00:59   View User's Profile U2U Member Reply With Quote
an will look a little like this

Engine -> Your Cat -> -> Your backbox.

instead of

Engine -> Your Cat -> -> Your back box

[Edited on 10-03-2006 by Paul_J]
Mertin
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Registered: 12th Oct 05
Location: Scotland
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10th Mar 06 at 01:00   View User's Profile U2U Member Reply With Quote
this what you reccomend?

whats TuV? something to do with mot's?
Paul_J
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Registered: 6th Jun 02
Location: London
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10th Mar 06 at 01:01   View User's Profile U2U Member Reply With Quote
Tuv is some europe modding law, may just be germany? To have a part on their car by law it must be Tuv approved - not relevant over here. With the center pipe, because you'll have a cat you'll pass MOT still.
Mertin
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Registered: 12th Oct 05
Location: Scotland
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10th Mar 06 at 01:01   View User's Profile U2U Member Reply With Quote
ok, thanks again! off to bed now lol
Scotty C
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Registered: 6th Nov 05
Location: Kidderminster Drives: 1.6 16v Sport
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10th Mar 06 at 15:15   View User's Profile U2U Member Reply With Quote
I have a de-cat AND a staright thru centre section (no silencers what so ever) on my x16xe, made it go abit better top end, but lost abit of low-down torque.
Mertin
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Registered: 12th Oct 05
Location: Scotland
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10th Mar 06 at 17:43   View User's Profile U2U Member Reply With Quote
cheers for the diagram paul

 
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