Cat before the turbo?

[lessthanjakejohn]

Do any of you emmisions minded people put your cat before your turbo to increase your "burn off" rate?

[AceInhole]

Nope. I'm willing to bet no one does that here. For one thing, it would hurt spool up. For another, it complicates things quite a bit, as the turbo is usually placed right off the manifold. Placing a cat between the manifold and turbo would take up quite a bit of room.

[WDRacing]

In 28 years I've never heard of such a thing. I would think it would make more sense to run dual race cats before that. Not to mention, you'd destroy the cat with all the heat from the motor.

WD

[silviaNE]

puting a cat befor the turbo would decrease catalitic lightup time considerably, but it would reduce your turbos abilty to spool up greatly. Unless you are using a small turbo with a fast spoolup and are very emmisions minded then it could be done. But i strongly recomend you choose a differnt avenue. It is possible to turbo a car and still get decent emmisions, you will just have tokeep your hp goals on the low side to avoid gross polution.

[hannibal]

I know the WRX comes from the factory with one of 3(?) cats before the turbo. Obviously, they did to meet US emissions. But I don't think anyone installing an aftermarket turbo system would be nearly as concerned about emissions as they would about performance. And like SilvisNE said, you probably can pass emissions test with the cat after the turbo.

[encasemyheart]

I know the WRX comes from the factory with one of 3(?) cats before the turbo. Obviously, they did to meet US emissions.

This is true but also some of the biggest performance adders for the WRX are mods which replace those pre-turbo cats with straight-thru piping.

So it would hurt performance greatly.

[themadscientist]

wouldn't the exhuast burn the cat's fur? That's kind of mean don't you think?

[fiznat]

wouldn't the exhuast burn the cat's fur? That's kind of mean don't you think?

lol nice one haha

[WDRacing]

Turbo or no turbo, your emmisions shouldn't change. As long as your ecu is tuned to add the proper amount of fuel for the extra air then you won't have a problem at all.

WD

[silviaNE]

the only concern is catalitic converter lightup time. some states have you run emissions with a cold car, and thats where the concern for emmisions is on startup.