Check Out My Compliance Cat

[Bakes]

Drive behind a car with no cat for long enough and your eyes will start stinging... It is pretty easy to tell if you know what to look and smell for

So true, my eyes were burning on the putty cruise. Car in front had no cat.

[LotusGTR]

Yea its steel wheeled.

I know spec sheet says 206kw but I'm pretty sure thats engine kw. No idea why it was 165awkw but it was running 0.65bar boost. Maybe the wastegate is dodgy cause the tuner couldnt get it to hold boost after 1.15bar, hence the 255awkw... =(

255 is respectable enough but the start point seems low. But it's hard to say what is 'normal' with these cars. How many are truly original......

[LotusGTR]

Have you checked to see if your complence cat has any internals? my car was complied with a gutted cat.

S'all shiney on the outside mate.....no need to check

[sav man]

Hahaha. Your car is for track! No need for compliancy...

not my R32, it does more road miles than track miles.

[Brandon]

Wo.. gtr_man instead of sav_man. Haha

Nick: yea I agree it'll vary but another point is the boost level might be the reason as well... anyway I'm not too bothered by it after the tune. Seriously before tuning, I'm not very impressed by it (mainly due to the lag) but after tuning, it makes a whole lot difference.

[joeyjoejoejuniorshabadoo]

+1 decat

[Travis Trayhern]

decat you will notice it straight up, even from a high flowing cat to decat u will notice it, wont give you more outright power but will me smoother and faster response down low.

lot of ppl think if it dosnt make more power its not worth it but that 10hp up the top is nothing its the extra 10hp down low you notice. recomend it decat but if you have a white car be prepaired to be clening the stains of your rear bar, and getting high with you windows down at 100kph

[bozodos]

btw Tony, on a N/A car you do need a certain amount of backpressure otherwise you start robbing power at low RPM (found this out when I owned a V8, single 2.5 gave a better power range than twin, and tri y extractors outperformed 4 into 1 until up in the revs) in a turbo car your turbo is the restriction, and you want to get rid of the used gas as efficiently as possible

[Tony de Wonderful]

deleted

Edited October 28, 2009 by Tony de Wonderful

[Tony de Wonderful]

btw Tony, on a N/A car you do need a certain amount of backpressure otherwise you start robbing power at low RPM (found this out when I owned a V8, single 2.5 gave a better power range than twin, and tri y extractors outperformed 4 into 1 until up in the revs) in a turbo car your turbo is the restriction, and you want to get rid of the used gas as efficiently as possible

It will be for some other reason.

Was it a fuel injected V8 or a carburettor?

Even if it was fuel injected I bet you were running lean and needed a re-tune. The problem is the inadequacy of your fuel delivery rather than to do with the way a piston engine works.

Do F1 or Nascar run mufflers? Topfuel?

[NizmoNigga]

Large EPA fine

+1 for De-Cat. EPA dont have units out inspecting cars here (Adelaide). All were scared of is Regency Inspection Center, they go by ADR (Adelaide Design Rules. lol).

[bozodos]

fuel injected, and the point I'm making is about low down - mid range power, response and torque, which isn't really applicable to a race car

[Tony de Wonderful]

fuel injected, and the point I'm making is about low down - mid range power, response and torque, which isn't really applicable to a race car

Look pal you need a tune is all and maybe an after market ECU.

...ain't a tuned race car around that runs a 'zaust system for 'back pressure'.

[bozodos]

cause I'm lazy, check out the Scavenging part of this wiki article http://en.wikipedia.org/wiki/Manifold_(aut...ve_engineering) , this is what I was getting at.

I don't own a V8 anymore so I don't need to worry about such things. I've had people try and say that I was losing power when I had a pipe only exhaust or that I was going to wreck my turbo somehow, but since the turbo itself is the main exhaust restriction, I don't see how either is possible.

[MrStabby]

I got faster spool when i changed stock cat for 200 cell metal cat. Ideally you want the ID of the cat flanges to the same ID as the exhaust flanges to keep it smooth. As stated you should be able to get a bolt in with the correctly oriented flanges.

IIRC you can wind in a bit more timing when you free up the exhaust as there's less exhaust contamination.

DECATs are for ppl who piss in the street and throw ciggie buts out the windows... dont me one of those ppl

For turbo cars you want as little back pressure as possible after the turbine - it makes the turbo work better - think about what a turbine does and how it does it. Comparisons with NA cars are not useful.