is a catalytic converter needed?

is it possible to get better gas mileage by cutting off catalytic converter and making straight pipe? if so how do you override/fool the sensor. or would it be better to just get an aftermarket cc?

 

Gonna have to call you out on this one. I can't think of any engine situation where a LOWER exhaust gas velocity is a better thing.

 

Okey-dokey, to me, "in check" means controlling/slowing the velocity. Definitely not what is desired, as exhaust gas velocity is what enables scavenging.

 

Just take it all off. Even the manifolds. You'll notice a difference.

 

I removed mine. Wasnt much of a difference in anything really

 

Take it off, get caught running and get a $2,000 fine.

 

Ye that's why I love Alberta not legally required!

 

Back in the 70s, car makers met the clean air act restrictions by adding catalytic converters, without doing a lot of engine retuning. The losses were fairly dramatic, and removing the cat pretty much took the engine back to how it had been set up before.

With the situation now, it's more complex. The engine and engine management system is designed from start to finish knowing they're going to be present.

The short answer is that a well tuned race engine set up for max power obviously won't have cats.

But, if you just cut off the cats and replace with straight pipe, without changing anything else - it's a coin flip, because the engine control programming and all the calibrations are expecting them to be there.

Might be better, might be worse.

Low restriction intake, low restriction exhaust, and retune the ECU on a dynamometer with the new stuff in place - yeah NOW you've got more power.

Just a hacksaw job? Don't be so sure.

 

Op

You can do one of two things

Remove the cat and run a straight pipe but make sure the 02 sensor is still somewhere installed in the pipe and add a URD simulator sensor inline

Or you can gut the cat and add a URD simulator sensor

http://www.urdusa.com/Electronics-R.../index.html?osCsid=co5t7a4qc4t5feoutlkvobi8t2