Corsa_Quadz
Member
Registered: 24th Feb 08
Location:
User status: Offline
|
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
Member
Registered: 17th Apr 06
User status: Offline
|
[pointless post] but i always thought the idea was to get rid of back pressure? [/pointless post]
|
Jenko_Sport
Member
Registered: 25th May 06
Location: Stoke-on-Trent
User status: Offline
|
How can you 'feel' like you need more back pressure?
|
Corsa_Quadz
Member
Registered: 24th Feb 08
Location:
User status: Offline
|
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
Member
Registered: 25th May 06
Location: Stoke-on-Trent
User status: Offline
|
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
Member
Registered: 18th Mar 03
Location: Berkshire Drives:UGLY MUG
User status: Offline
|
put a sport cat on, less hassle for MOT anyway!
|
Richardhhha
Member
Registered: 29th Sep 07
Location: Croydon, Greater London
User status: Offline
|
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
Member
Registered: 24th Feb 08
Location:
User status: Offline
|
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
Member
Registered: 25th May 06
Location: Stoke-on-Trent
User status: Offline
|
Just seemed like a pretty random question with nothing to back it up.
|
flybikeslee
Member
Registered: 2nd Jan 07
Location: Liverpool
User status: Offline
|
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
Member
Registered: 9th Nov 07
Location: Glasgow
User status: Offline
|
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
Member
Registered: 24th Feb 08
Location:
User status: Offline
|
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
Member
Registered: 24th Feb 08
Location:
User status: Offline
|
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
Member
Registered: 25th May 06
Location: Stoke-on-Trent
User status: Offline
|
Its a 1.6 na corsa, back pressure would be the least of my worries tbh.
|
alan-g-w
Member
Registered: 9th Nov 07
Location: Glasgow
User status: Offline
|
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
Member
Registered: 28th Jul 08
Location: Cheshire
User status: Offline
|
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
Member
Registered: 9th Aug 05
Location: Dingwall, Highland
User status: Offline
|
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
Member
Registered: 5th Oct 08
Location: grimsby
User status: Offline
|
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
Member
Registered: 25th May 06
Location: Stoke-on-Trent
User status: Offline
|
Ive come across as abit of a c*nt in this thread, im sorry
|
Corsa_Quadz
Member
Registered: 24th Feb 08
Location:
User status: Offline
|
No worries mate nothing new there
*jokes*
Bad day??
|
Jenko_Sport
Member
Registered: 25th May 06
Location: Stoke-on-Trent
User status: Offline
|
Think i was just tired earlier haha
|
boz_gsi
Member
Registered: 12th Apr 07
Location: stoke-on-trent
User status: Offline
|
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
Member
Registered: 8th Jan 04
Location: Area Motorsport Drives: Race EP3
User status: Offline
|
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
Member
Registered: 24th Jan 05
User status: Offline
|
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
|
