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Corsa_Quadz

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Registered: 24th Feb 08
Location:
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6th Nov 09 at 09:00

Morning boys

Just a quick question, i feel like my car could do with some more back pressure in the exhaust system to give it a bit more umph

It currently has decat and powerflow straight through around 2" bore if i remember correctly with oval backbox, not really ideal tbh, is there anything i can do to get some more back pressure??

Anyone recommend maybe a different backbox or something?

Oh and its a 1.6 Gsi if that makes a difference

Matt L

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Registered: 17th Apr 06
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6th Nov 09 at 09:31

[pointless post] but i always thought the idea was to get rid of back pressure? [/pointless post]

Jenko_Sport

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Registered: 25th May 06
Location: Stoke-on-Trent
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6th Nov 09 at 09:35

How can you 'feel' like you need more back pressure?

Corsa_Quadz

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Registered: 24th Feb 08
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6th Nov 09 at 10:26

Thanks Matt what would CS do without your sarcastic input

Im not entirely knowlegable about this thats why i posted it, obviously theres something terribly wrong with asking a question i wasnt sure about.

After chatting with someone my car might be running too rich. So they have answered my question.

Thanks for your efforts though

Jenko_Sport

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Registered: 25th May 06
Location: Stoke-on-Trent
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6th Nov 09 at 10:49

But where did the question come from.

did you put your hand over the back box and think 'oooo thats alot of gases coming out eeek'

'Maybe i needz mre prezzurs'

ryzer

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Registered: 18th Mar 03
Location: Berkshire Drives:UGLY MUG
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6th Nov 09 at 10:54

put a sport cat on, less hassle for MOT anyway!

Richardhhha

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Registered: 29th Sep 07
Location: Croydon, Greater London
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6th Nov 09 at 10:54

all cars need some form of back pressure of they tend to run like crap. 2stroke bikes have to run a fair bit of they dont run right eather.

Corsa_Quadz

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Registered: 24th Feb 08
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6th Nov 09 at 11:19

quote:
Originally posted by Jenko_Sport
But where did the question come from.

did you put your hand over the back box and think 'oooo thats alot of gases coming out eeek'

'Maybe i needz mre prezzurs'

Fucking hell mate how old are you

Thanks ryzer it might be something to think about, thanks for that

[Edited on 06-11-2009 by Corsa_Quadz]

Jenko_Sport

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Registered: 25th May 06
Location: Stoke-on-Trent
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6th Nov 09 at 11:23

Just seemed like a pretty random question with nothing to back it up.

flybikeslee

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Registered: 2nd Jan 07
Location: Liverpool
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6th Nov 09 at 11:26

tis true if you run too big a bore it just runs shite, my corsa was the same, felt dead flat with no cat and a bigger bore so had a smaller middle pipe made up and felt so much better and smoother

alan-g-w

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Registered: 9th Nov 07
Location: Glasgow
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6th Nov 09 at 11:28

I'm running a manifold on the XE just now since the de-cat pipe snapped. I thought it would be drinking the fuel but the mileage's pretty much the same, I've defientely lost some low down power though.

Corsa_Quadz

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Registered: 24th Feb 08
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6th Nov 09 at 11:34

quote:
Originally posted by Jenko_Sport
Just seemed like a pretty random question with nothing to back it up.

Why do you think i asked the bloody question you dougnut

There are some posts that back it up as well, Lee for example............

I dont get what your problem is tbh

Corsa_Quadz

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Registered: 24th Feb 08
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6th Nov 09 at 11:35

quote:
Originally posted by flybikeslee
tis true if you run too big a bore it just runs shite, my corsa was the same, felt dead flat with no cat and a bigger bore so had a smaller middle pipe made up and felt so much better and smoother

What size centre section did you run bud?? Think about getting something made up or if i can source a decent after market one.... any ideas??

Jenko_Sport

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Registered: 25th May 06
Location: Stoke-on-Trent
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6th Nov 09 at 11:36

Its a 1.6 na corsa, back pressure would be the least of my worries tbh.

alan-g-w

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Registered: 9th Nov 07
Location: Glasgow
User status: Offline

6th Nov 09 at 11:40

Back pressure's something you need to worry about on an NA car tbh. It's on turbo'd motors that you want rid of the gases as much as possible as far as I understand it.

Griffiths1991

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Registered: 28th Jul 08
Location: Cheshire
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6th Nov 09 at 12:50

I always though low back pressure on a turbo engine helps the turbo to spool up quicker and and loosing to much back pressure on a na engine ie bigger bore exhaust than standard makes them run lean.

[Edited on 06-11-2009 by Griffiths1991]

[Edited on 06-11-2009 by Griffiths1991]

ShEp

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Registered: 9th Aug 05
Location: Dingwall, Highland
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6th Nov 09 at 13:08

Back pressure isn't needed on a turbo engine

But an n/a engine needs a bit of backpressure,

Your risking burning the valves with no back pressure on an n/a engine

markx14xe

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Registered: 5th Oct 08
Location: grimsby
User status: Offline

6th Nov 09 at 13:29

quote:
Originally posted by Corsa_Quadz

quote:
Originally posted by flybikeslee
tis true if you run too big a bore it just runs shite, my corsa was the same, felt dead flat with no cat and a bigger bore so had a smaller middle pipe made up and felt so much better and smoother

What size centre section did you run bud?? Think about getting something made up or if i can source a decent after market one.... any ideas??

just have a middle cylinder middle box fitted m8 because i had the same problem i lost back pressure with a full straight throught pipe instead of a middle box was louder but slower

my 0 to 60 was slow and topspeed so the was every point of you post m8

some ppl on here are just f**k*** tw**s
h
just ignore them i do

Jenko_Sport

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Registered: 25th May 06
Location: Stoke-on-Trent
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6th Nov 09 at 13:42

Ive come across as abit of a c*nt in this thread, im sorry

Corsa_Quadz

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Registered: 24th Feb 08
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6th Nov 09 at 14:14

No worries mate nothing new there

*jokes*

Bad day??

Jenko_Sport

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Registered: 25th May 06
Location: Stoke-on-Trent
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6th Nov 09 at 14:27

Think i was just tired earlier haha

boz_gsi

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Registered: 12th Apr 07
Location: stoke-on-trent
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6th Nov 09 at 15:06

have a small powerflow center box welded in dude, that should be just about right if u have a 2 bore all the way though, aslo its not tha hard tp put back if it doesnt help

Rob B

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Registered: 8th Jan 04
Location: Area Motorsport Drives: Race EP3
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6th Nov 09 at 17:02

2" Should be about right, back pressure or not shouldn't really be what your thinking about. You want to be thinking about the quickest way you can get the gases out, therefore the air can get in quicker through the inlet.

Jake

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Registered: 24th Jan 05
User status: Offline

6th Nov 09 at 17:10

quote:
Originally posted by ShEp

Your risking burning the valves with no back pressure on an n/a engine

whys that? not being funny just interested

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