Jump to content
SAU Community

Recommended Posts

I'm after some performance points.....and I like the ones that come without a downside (besides money).

So anyway I have ~230rwkw, a nice dump pipe and exhaust (Fujitsubo twin 2.5") but I remember I bought a ceramic cat cause I only had a stock turbo back then. So, should I now fit a high flow 100 cell metal cat?

If I replaced the cat with a metal cat would I even notice where my $400 went? Anybody got some dyno numbers to back up claims?

Seem that the 3" outlet/inlet with 4" 100 cell biscuit is the go.

Edited by simpletool
  • Like 1
Link to comment
https://www.sau.com.au/forums/topic/365294-catsdo-they-make-a-difference/
Share on other sites

Look around for a larger stock cat at a exhaust shop waste bin, lots of people replace the cats on 5.7 ltr GM cars, it may flow well enough for your power levels and cost not much to nothing.

ahh ha. Found a dyno comparison after some searching. Makes about a 4% improvement from a ceramic cat and about a 3% drop from a straight pipe. Gain of 14whp on an Evo that started with 300whp (gains over entire curve).

http://forums.evolutionm.net/evo-engine-turbo-drivetrain/330000-ceramic-cat-vs-100-cell-metal-substrate-cat.html

Just a dumb ass question guys....

How do you tell if your cat is a highflow?

I have a 3"exhaust and have no idea about the cat..was already on there sorta looks like a standard one but in a 3" variety. can you get them checked? apart from looking at the cells...

Dazza

id say that apart from making little difference at the wheels, the only reason i would be changing to to a metal CAT is they are less likely to "meltdown". if a heap of raw fuel is punched down the exhaust and ignites and melts the monolith, then ofcourse going from a pile of melted (blocked) mess to a highflow you will notice a difference.

also metal CATs are arent known for cracking up and coming apart like ceramic CATs, including impact damage for those who like their cars low and their CATs eating speedhumps and driveways

I dont think that you'll be noticing much difference.

pull your cat out and see how it looks, if you can see light through it then its going to flow well. the only time a cat is going to cause and issue is if it is collapsed.

as far as people saying you gain 30kw going to straight pipe, its probably on cars with well over 300kw. and maybe their cat wasnt flowing well enough and causing a restriction.

but at 230kw a 3in highflow cat should be fine even up to over 300kw.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • We will review wtf is going on, but if you made any donations let me know and i will follow it up with the admins
    • See, that button sounds like perfection Duncan! My eyes really don't like light shining at them from a dash when I'm driving. Being part red colourblind, I've found for most cars that I can change colours on, I set everything to red, so my eyes see the elast amount of colour! I miss normal gauges in cars
    • bro, knowing the Japanese in  the 90's, i wouldn't be surprised if they shared components across their model lineup.
    • Maaaan so many "little" things  i rly hope my old RB20 would be "ok" and not too bad. I try to learn what and what not do i need. I look at crossmember at it looks different...even parts numbers are different. Wiring and all that i rly do not know...yeah someone mentioned the speedo thing. On that yoke clip. I rly do not know what can and cant be done "custom" so that is why iam asking to know and not be suprised 🙂  I know what it looks like  
    • Oh, there's also the gearbox crossmember which will probably be different between the small box and the big box, and the wiring loom will probably need to be modified, because the plugs for the switches etc, will probably be different. And I think the speedo on the small box R34s is from somwhere stupid, like the diff, possibly, so you'd need to work out what needs to be done about that (assuming it is different). I think the thing you need to realise is that the front end of that yoke is a large hollow tube with splines on the inside that mates with the splines on the box's output shaft. It is a dedicated thing - not available "aftermarket". They were made to suit that box, by the car's OEM.
×
×
  • Create New...