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race cat
#1360121
14/07/2012 12:06
14/07/2012 12:06
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Joined: Dec 2005
Posts: 239 Surrey
20vt_alex
OP
Making a profit
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OP
Making a profit
Joined: Dec 2005
Posts: 239
Surrey
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quick question guys, i have the opportunity to buy a race cat(not sure if it is 100 or 200 cell yet), but was wondering will this damage my standard turbo seals just like de-catting would??
LE 0174
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Re: race cat
[Re: 20vt_alex]
#1360148
14/07/2012 14:20
14/07/2012 14:20
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MickeyBravo20v
Unregistered
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MickeyBravo20v
Unregistered
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a few have on the 20v na bravs without problems too. scoobies and evo owners do too.
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Re: race cat
[Re: 20vt_alex]
#1360170
14/07/2012 15:39
14/07/2012 15:39
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MickeyBravo20v
Unregistered
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MickeyBravo20v
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aparantly the 5 pots arnt good without a cat (even though 20v na's havnt a turbo) they seem to run fine. but still most scoobies and evo's do. All the power those lads run without a cat,im sure they wouldnt if they had problems. im guessing itd be the same for us??
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Re: race cat
[Re: 20vt_alex]
#1360196
14/07/2012 17:30
14/07/2012 17:30
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MickeyBravo20v
Unregistered
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MickeyBravo20v
Unregistered
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right
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Re: race cat
[Re: 20vt_alex]
#1360328
15/07/2012 09:20
15/07/2012 09:20
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1NRO
Unregistered
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1NRO
Unregistered
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Back pressure isn't good on any engine.
Pressure differential.......
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Re: race cat
[Re: 20vt_alex]
#1360334
15/07/2012 10:12
15/07/2012 10:12
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Joined: Sep 2009
Posts: 5,022 ation
szkom
Club member 2000
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Club member 2000
Forum is my life
Joined: Sep 2009
Posts: 5,022
ation
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Re: race cat
[Re: 20vt_alex]
#1360455
15/07/2012 21:06
15/07/2012 21:06
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Joined: Aug 2000
Posts: 9,729 Zele, Belgium
Kayjey
Club Member #10
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Club Member #10
Je suis un Coupé
Joined: Aug 2000
Posts: 9,729
Zele, Belgium
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On my Punto HGT, removing the cat was a very bad idea. I lost 15 bhp. If an engine is tuned for a certain exhaust, then removing the cat can be a bad idea because it changes the exhaust line the car is tuned for. Indeed, less backpressure SHOULD see you more horses, but there are other effects (heat difference, scavenging effects,...) that also come into the equation. Which is why I said 'without looking into other stuff'.
- Kayjey -
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Re: race cat
[Re: pinin_prestatyn]
#1360508
15/07/2012 23:44
15/07/2012 23:44
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1NRO
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1NRO
Unregistered
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I'd love to see an explanation of why NA engines need a bit of back pressure....... what does it do that's of benefit?
Last edited by 1NRO; 15/07/2012 23:44.
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Re: race cat
[Re: ]
#1360659
16/07/2012 17:04
16/07/2012 17:04
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Joined: Dec 2005
Posts: 12,295 Sandhurst
Begbie
Ex El Presidente
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Ex El Presidente
I AM a Coop
Joined: Dec 2005
Posts: 12,295
Sandhurst
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I'd love to see an explanation of why NA engines need a bit of back pressure....... what does it do that's of benefit? Well, it's not back pressure, but exhaust scavenging
Your car is Usain Bolt with wellies
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Re: race cat
[Re: Begbie]
#1360727
16/07/2012 20:48
16/07/2012 20:48
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1NRO
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1NRO
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Well, it's not back pressure, but exhaust scavenging Exhaust scavenging I can roll with but what does back pressure have to do with that?
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Re: race cat
[Re: 20vt_alex]
#1360751
16/07/2012 21:58
16/07/2012 21:58
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1NRO
Unregistered
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1NRO
Unregistered
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I would suggest that the cat acts as a stop end (as far as exhaust pulse activity is concerned)which would return a compression pulse (higher pressure) towards the exhaust valves rather than the more desirable rarefaction type (lower pressure).
Anybody got any pictures of a 20v exhaust system I can look at?
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