Fordmods Logo

Hi flow Cat or Straight threw cat? 

 

Page 1 of 2 [ 25 posts ] Go to page 1, 2  Next

 
 Post subject: Hi flow Cat or Straight threw cat?
Posted: Mon Aug 11, 2008 6:35 pm 
Smokin em up
Offline

Age: 30

Posts: 274

Joined: 22nd Feb 2006

Ride: AU 6

Location: Geelong
VIC, Australia

Hey guys, is it better to run a high flow cat than to run a Cat thats gutted out and replaced with a straight threw piece of tubing?
Im looking to buy a Metal cat and ditch my straight threw one,
I know there illegal! but it did go better!

thanks Joe
Top
 Profile  
 
 
Posted: Mon Aug 11, 2008 6:47 pm 
Getting Side Ways
Offline

Age: 31

Posts: 2337

Joined: 25th Apr 2008

Ride: Boxcar Love

Location: Brisbane
QLD, Australia

I'd go the metal cat, i had a straight through cat on another car for a while, and while they are cheap and effective, i noticed an improvement in sound and performance with the fitment of a metalcat.

Andrew.

 

_________________

Commodore australia's favorite car??? What a load of s**t
Image

Top
 Profile  
 
 
Posted: Mon Aug 11, 2008 8:29 pm 
Getting Side Ways
Offline
User avatar

Age: 31

Posts: 11103

Joined: 15th Nov 2004

Ride: AU III XR8 Pursuit 250 ute

Location: Hobart
TAS, Australia

Nothing is going to flow better than a straight through pipe. The cat can be as high flow as it wants, but it's still going to not flow as well. In saying that will you notice the difference - probably not. So if it's for a road car, I guess it's a personal decision on whether it's worth the risk of the fine and defect for such a small gain.

 

_________________

Heaps of performance EF/L parts for sale, including supercharged VCT motor!

2002 Ford AU Series III Falcon XR8 Pursuit 250 ute - 5.6L of V8 Windsor!

Top
 Profile  
 
 
Posted: Mon Aug 11, 2008 9:58 pm 
Getting Side Ways
Offline
User avatar

Age: 34

Posts: 10826

Joined: 17th Apr 2005

Gallery: 34 images

Ride: BF MK11 XR 6 TURBO ZF 6spd

Power: 225 rwkw

Location: glenwood/sydney
NSW, Australia

$10,000 fine for a straight through cat...for a handfull of horse power..... or could buy a turbo kit with installation... for that money and have a whole herd of extra horsepower.. :lol:

 

_________________

Todd: Nurse, suction.
Nurse: The patient's not even here yet.
Todd: I know.

http://www.youtube.com/watch?v=_GQpRYRcAiA

Top
 Profile  
 
 
Posted: Tue Aug 12, 2008 6:45 pm 
Getting Side Ways
Offline

Age: 27

Posts: 1323

Joined: 12th Nov 2006

Gallery: 9 images

Ride: 02 xls ute 347

Location: adelaide
SA, Australia

u sure its 10 gs for a straight through cat my cousin got defect for it but he didnt get no fine and with a gut out cat u could even say u didnt no it was gutted out coz when cats f**k up the gut them selfs and f**k the exhaust like are oul ef

 

_________________

02 series 3 AU marline ute 5speed 347 stroker

Top
 Profile  
 
 
Posted: Tue Aug 12, 2008 6:47 pm 
Getting Side Ways
Offline
User avatar

Age: 34

Posts: 10826

Joined: 17th Apr 2005

Gallery: 34 images

Ride: BF MK11 XR 6 TURBO ZF 6spd

Power: 225 rwkw

Location: glenwood/sydney
NSW, Australia

ea_falcon wrote:
u sure its 10 gs for a straight through cat my cousin got defect for it but he didnt get no fine and with a gut out cat u could even say u didnt no it was gutted out coz when cats f**k up the gut them selfs and f**k the exhaust like are oul ef
its not the police with the $10,000 fine.. im fairly sure if you were caught haveiing intentionally hollowed the cat by the EPA you would get the large fine...

 

_________________

Todd: Nurse, suction.
Nurse: The patient's not even here yet.
Todd: I know.

http://www.youtube.com/watch?v=_GQpRYRcAiA

Top
 Profile  
 
 
Posted: Tue Aug 12, 2008 6:50 pm 
Fordmods Junkie
Offline
User avatar

Posts: 11739

Joined: 17th May 2005

Gallery: 11 images

Ride: EL Fairmont, VFR400 racer

Power: 144 rwkw

Location: Melbourne
VIC, Australia

ea_falcon wrote:
u sure its 10 gs for a straight through cat my cousin got defect for it but he didnt get no fine and with a gut out cat u could even say u didnt no it was gutted out coz when cats f**k up the gut them selfs and f**k the exhaust like are oul ef


I'm sure you you get a fine...but that would depend on each state. If the cat guts itself, then I say your car wouldn't run very well when all the crap from the cat blocks the muffler. Not to mention...you need to bash it pretty hard to gut it out. I don't think exhaust gases at that pressure/temperature/speed is sufficient enough to gut the cat on its own.

Anyways...run a catalytic converter...don't be cheap.

phong =P~

 

_________________

phongus = Post whore 2006
EL XR6 motor, EL ECU + J3 chip, WADE 1673 Camshaft, 3" S/S intake, Pacy 4480, 2.5" Hi flow cat, 2.5" Lukey exhaust.
Max Power = 144.6 rwkw (03/05/2008)

Top
 Profile  
 
 
Posted: Tue Aug 12, 2008 6:56 pm 
Getting Side Ways
Offline
User avatar

Age: 28

Posts: 4326

Joined: 30th Oct 2006

Gallery: 18 images

Ride: Envi EF

Location: Grafton
NSW, Australia

My cat internals were a bit fkd up and loose after I hit some large gravel built up in the middle of the road, and a bit of it just fell out when I pulled the cat out and tipped it upside down.
Mind you, only a bit of the front was broken off, more than 3/4s of it was fine.
I'd like to see a cat gut itself.

 

_________________

>>>EF Futura T build<<<

Top
 Profile  
 
 
Posted: Tue Aug 12, 2008 6:58 pm 
Parts Gopher
Offline

Posts: 53

Joined: 29th Jun 2008

Location: sa
SA, Australia

can someone tell me how u get defected for this

at first glance their is no way in hell someone is going to be able to tell if a cat is gutted or not.

well dont know about the other states but the chances of being defected for this illegal mod in SA would be slim...especially when their is quite a few jap crape cars driving around with a huge defect sticker on their car!!!
yes it is defectable but the chances of being caught for it unless you were doing something completly stupid to get pulled over in the first place are slim

what type of sound difference does it make? i got told it makes a more hollow sound...u reckon the sound is better or worse?

i was going to do this to my EF but people convinced me otherwise. what are all u guys thoughts on the sound?
Top
 Profile  
 
 
Posted: Tue Aug 12, 2008 11:51 pm 
Getting Side Ways
Offline

Age: 29

Posts: 2563

Joined: 19th Feb 2007

Gallery: 21 images

Ride: 98 EL Futura

Power: 199 rwkw

Location: Lilydale
VIC, Australia

pretty sure it gives this foul smell when there is no cat

 

_________________

EL Futura: CVE head, Wolf V500, ICE Ignition and Coil, 36lb injectors, Walbro 255lb, Paci comps, 3" exhaust, T5, Harrop Truetrac with 3.9s. Now with 198.9rwkw, (~185rwkw and 13.80 @99.1mph) with more power to come

Top
 Profile  
 
 
Posted: Tue Aug 12, 2008 11:56 pm 
Getting Side Ways
Offline
User avatar

Age: 28

Posts: 4326

Joined: 30th Oct 2006

Gallery: 18 images

Ride: Envi EF

Location: Grafton
NSW, Australia

I've smelt a few cars with gutted cats now, and they smell the same, maybe a bit rich if anything.

 

_________________

>>>EF Futura T build<<<

Top
 Profile  
 
 
Posted: Wed Aug 13, 2008 8:34 am 
Getting Side Ways
Offline

Age: 30

Posts: 1087

Joined: 1st Sep 2007

Ride: '07 LT XR5

Power: 133 rwkw

Location: sydney
NSW, Australia

depends on the car, some have a F**k bad smell, some end up making a nice puddle of petrol on the ground just after the exhaust tip.

it does have a more hollow / tinny sound as well

 

_________________

So much RAM the motherboard twisted off the POST.

I lost 3 cylinders... but gained a turbo...
Proud owner of an '07 XR5Turbo

Top
 Profile  
 
 
Posted: Wed Aug 13, 2008 11:02 am 
Getting Side Ways
Offline
User avatar

Age: 31

Posts: 2098

Joined: 19th Jan 2005

Gallery: 9 images

Ride: 5L 5 speed Fairmont Ghia

Location: St Maoris
NSW, Australia

SgtBourne wrote:
depends on the car, some have a F**k bad smell, some end up making a nice puddle of petrol on the ground just after the exhaust tip.

it does have a more hollow / tinny sound as well


It sounds hollow when you are accelerating. If you are coasting/decelerating you can't tell the difference. The exhaust will smell of sulur. I also noticed that there was not enough backpressure to the engine, which caused me to have a massive flat spot.

there is a screen at the rear of the cat. It is similar to mesh used for flyscreens. It takes a bit of effort to break this (a standard cat will not be able to gut itself).

 

_________________

Remember kids, the more pages of crap in your build thread, the bigger your e-penis is

Top
 Profile  
 
 
Posted: Wed Aug 13, 2008 2:12 pm 
Smokin em up
Offline

Age: 30

Posts: 274

Joined: 22nd Feb 2006

Ride: AU 6

Location: Geelong
VIC, Australia

the hollow sounds is deleted by addding the straight threw pipe, also im wondering about the back pressure as well?
Top
 Profile  
 
 
Posted: Wed Aug 13, 2008 4:23 pm 
Getting Side Ways
Offline

Age: 29

Posts: 2563

Joined: 19th Feb 2007

Gallery: 21 images

Ride: 98 EL Futura

Power: 199 rwkw

Location: Lilydale
VIC, Australia

that just got me thinking, maybe the flatspot in my car is the my cat, im gonna look into it.

 

_________________

EL Futura: CVE head, Wolf V500, ICE Ignition and Coil, 36lb injectors, Walbro 255lb, Paci comps, 3" exhaust, T5, Harrop Truetrac with 3.9s. Now with 198.9rwkw, (~185rwkw and 13.80 @99.1mph) with more power to come

Top
 Profile  
 
Display posts from previous:
Sort by  
 Page 1 of 2  [ 25 posts ]  Go to page 1, 2  Next

Who is online

Users browsing this forum: No registered users and 27 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

 

 

It is currently Fri Dec 15, 2017 11:31 am All times are UTC + 11 hours

 

 

(c)2014 Total Web Solutions Australia - Australian Web Hosting and Domain Names