Effects of taking out my cat?

**Dave-TransAm** · 02-28-2011, 03:11 PM

Yeah ill end up getting it tuned pretty quick here. I was bored today so I took the catback off and I'm just running on the stock headers and cat. It sounds amazing but will it do any damage to anything?

***Cutlass*** · 02-28-2011, 05:41 PM

Guys, this guy has a 94...he might not even have rear O2 sensors. Gut them and go!

**Dave-TransAm** · 02-28-2011, 05:42 PM

Originally Posted by Cutlass

Guys, this guy has a 94...he might not even have rear O2 sensors. Gut them and go!

im pretty sure i do but dont quote me on it haha

***Cutlass*** · 02-28-2011, 05:46 PM

Rear O2s are a OBD II thing. OBD II started in 1996, but some 95s vehicle also had some OBD II things like rear O2s.

**35th-ANV-SS** · 02-28-2011, 06:40 PM

never even looked at the year of vehicle. Good catch!

**Steve's LS1** · 02-28-2011, 07:53 PM

well i have a 98 ls1 camaro and i put lt's on it and its still open headers right now and i drove it around the block with no o2 sensors in and no lights never came on, and the car runs and idles fine, is this a problem????

**35th-ANV-SS** · 02-28-2011, 08:00 PM

Originally Posted by Steve's LS1

well i have a 98 ls1 camaro and i put lt's on it and its still open headers right now and i drove it around the block with no o2 sensors in and no lights never came on, and the car runs and idles fine, is this a problem????

No.

**TLS_Addict** · 02-28-2011, 08:03 PM

Thats a MAF car correct and not the SD right?

You can get a cable and tune the thing yourself with your laptop.

**67CamaroRSSS** · 02-28-2011, 08:08 PM

You won't pass smog here in The Valley of The Sun without the cat on a 94. Be prepared to swap out the pipe every 2 years.

IMHO, that's a thing I would do if I had an early LT1...

**67CamaroRSSS** · 02-28-2011, 08:10 PM

Originally Posted by TLS_Addict

Thats a MAF car correct and not the SD right?

You can get a cable and tune the thing yourself with your laptop.

You are correct. 93 was the only speed density year for LT1 engines in an F-body...

**Dave-TransAm** · 03-01-2011, 04:26 AM

Originally Posted by 67CamaroRSSS

You won't pass smog here in The Valley of The Sun without the cat on a 94. Be prepared to swap out the pipe every 2 years.

IMHO, that's a thing I would do if I had an early LT1...

Yep that's what I'm going to do.

**Firebirdformula99** · 03-03-2011, 12:28 PM

you can trick the car by using anti spark plug foulers buy four 18mm drill them out to i think a 1/2 inch or a lil more take two of the foulers and screw them onto your o2 censor and screw it back in and clear the code

**Too Fast** · 03-03-2011, 01:52 PM

^^^Huh?

**Firebirdformula99** · 03-03-2011, 03:13 PM

its just a spacer a cheap way to fool the car to think that the cats are still there once you take your cats out it throws the code i did it to my car after i took out my cats and cleared the code and its never came back

***Cutlass*** · 03-03-2011, 05:16 PM

Originally Posted by Too Fast

^^^Huh?

He's talking about mechanical O2 simulators.
I made a mechanical O2 simulator for my Blazer with a hollowed converter and it worked great. Go to the parts store and buy 2 Help!brand spark plug anti-foulers.

Drill out the one to make room for the sensor and then screw them together like this:

This spaces the O2 sensor away from direct exhaust flow which makes the sensor read lazy because it only sampling a small amount of exhaust and simulates a fully functional converter.

It works!!! I've tried it.

***pajeff02*** · 03-03-2011, 05:19 PM

^^ What's funny is that is what Innovate wants me to do for my wideband. Any time I open my cutout or mash WOT, the sensor wigs out and goes into error mode.

**Too Fast** · 03-04-2011, 02:24 AM

Originally Posted by Cutlass

He's talking about mechanical O2 simulators.
I made a mechanical O2 simulator for my Blazer with a hollowed converter and it worked great. Go to the parts store and buy 2 Help!brand spark plug anti-foulers.

Drill out the one to make room for the sensor and then screw them together like this:

This spaces the O2 sensor away from direct exhaust flow which makes the sensor read lazy because it only sampling a small amount of exhaust and simulates a fully functional converter.

It works!!! I've tried it.

OIC.

That would probably work a lot of the time, since the exhaust sample is so small. You might get an occasional code tho. How long has yours been in, Cutlass?