Reply With Quotedoesn't that tell u anything??Originally Posted by kugzs
and yea u're looking at an exhaust system... it's a straight piece of pipe.. doesn't get any simpler than that
Bigger Cat increasing backpressure?
i just got this message from an ebay seller after enquiring about cats bigger than 3 inch.
a bigger cat wont allow more flow. a 3 inch hi flow is more than required for a 3 inch system. a bigger cat will cause more back pressure same as a bigger muffler would.
Is he full of shit? How could a bigger cat no flow more and how can a 3 inch cat flow as much as a piece of 3 inch pipe?
thanks
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Re: Bigger Cat increasing backpressure?
doesn't that tell u anything??
and yea u're looking at an exhaust system... it's a straight piece of pipe.. doesn't get any simpler than that
Research has shown child in front seat causes accidents, accident in back seat causes child
Re: Bigger Cat increasing backpressure?
He is full of shit.
YelloRolla's KE20 1/4mi = 11.32 @ 119mph @ 22psi on slicks
12.44 @ 113 mph on 165 wide street tyres
210rwkw - not bad for a smelly 3TGTE running pump fuel.
Re: Bigger Cat increasing backpressure?
kugz ol mate, you will have to do a bit of research.Tthere are cats, and there are cats.
An issue of ZOOM actually had a fairly good write up on various cats, versus Magic cats, versus straight pipe. One of the advertisers in the mag sells the magic cats, he owns a potent 1JZ-GTE RA23 Celica. The tests were carried out on that car.
cheers Chuck.
"What man can build, man can fix!"
MS51Crown Coupe,
GSV40R Aurion luxo tourer. One TA22 currently receiving some TLC prior to paint One RS56 Crown ute under construction, 2 x TA22's awaiting rebuilds. Toyota Crown RS47J ute in need of serious TLC. Toyota Crown Custom Wagon MS53 daily hauler stocko!
Re: Bigger Cat increasing backpressure?
does anyone else think that sounds suss?
my days in magazine-ville makes me smell rat big time...
../delete/ban
tech moderator
E46 M3 Nürburgring Nordschleife - 8.38
Re: Bigger Cat increasing backpressure?
thats funny
flow is abotu cross-sectional area, and resistance. the cross-sectional area of the cat material and the structure changes it's resistance.
normal cats have many 1mm square holes, with larger area than the pipe that comes in, but higher resistance per unit area, because of more surface area...
the point of the cat is to get maximum exposure to surface area, so the gas gets catalyse din the fraction of a second as it goes thru the cat.
ebay sellers..... thats as bad as buying a plan or kit for a high speed boat from an ebay seller
heck, even legit businesses are bodgy at times...
"I'm a Teaspoon, not a mechanic"
"There is hardly anything in the world that a man can not make a little worse and sell a little cheaper" - John Ruskin (1819 - 1900)
AU$TRALIA... come and stay and PAY and PAY!!! The moral high horse of the world!
Re: Bigger Cat increasing backpressure?
he needs to sell it somehow doesnt he?
Eldar.O.
Re: Bigger Cat increasing backpressure?
Hahahahaha.
The shop is Magic Performance in Carter Rd at Brookvale. They are a small shop doing good things. The Magic cat has a metal substrate and it flows well (ie good numbers on the flow bench), how well it works as a catalytic converter is another story. I believe that it is approved though, by which authority I am unsure, but it would be best to talk to Matt at Magic and ask him.
Jase
YelloRolla's KE20 1/4mi = 11.32 @ 119mph @ 22psi on slicks
12.44 @ 113 mph on 165 wide street tyres
210rwkw - not bad for a smelly 3TGTE running pump fuel.
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