If I gut my cats.....
If I gut my cats..... I have been driving around for about 5 months on them ( only like 1000 miles) and I have not had a single code on my front o2's. My question is, if I gut my cats and lose that back pressure will I start throwing codes on my front o2's or will I have absolutely no problems at all. Thanks
You will get a code for the rear O2s. But the car will have no problem due to removing cats. The computer read the front o2 sensor, which should be changing constantly. Then it compares that reading to the rear o2 sensors, which should be more stable due to the cat. If the cat is removed, the rear sensors will read similar to front ones. Thats how the computer knows if the cat is working or not. The front o2s wouldnt be affected and you can always tune out the code later on.
However, i heard if you have a v6 camaro and gut the cat, you will smoke vipers and have no traction under 80mph
jk your title reminded me of that story
However, i heard if you have a v6 camaro and gut the cat, you will smoke vipers and have no traction under 80mph
jk your title reminded me of that story 
TECH Fanatic
Joined: Jan 2010
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From: Euless Tx
You will get a code for the rear O2s. But the car will have no problem due to removing cats. The computer read the front o2 sensor, which should be changing constantly. Then it compares that reading to the rear o2 sensors, which should be more stable due to the cat. If the cat is removed, the rear sensors will read similar to front ones. Thats how the computer knows if the cat is working or not. The front o2s wouldnt be affected and you can always tune out the code later on.
However, i heard if you have a v6 camaro and gut the cat, you will smoke vipers and have no traction under 80mph jk your title reminded me of that story
However, i heard if you have a v6 camaro and gut the cat, you will smoke vipers and have no traction under 80mph
jk your title reminded me of that story
The rear O2 sensor acts kinda like a "monitor" for a lack of a better term. Just get it tuned out.
I have been driving around for about 5 months on them ( only like 1000 miles) and I have not had a single code on my front o2's. My question is, if I gut my cats and lose that back pressure will I start throwing codes on my front o2's or will I have absolutely no problems at all. Thanks
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Choking the exhaust doesn't increase performance at all (actually, it can be actively controlled via exhaust or jake brakes on larger trucks to provide increased engine braking to reduce wear on brake pads and rotors). Backpressure myths probably come mostly from backyard mechanics deciding they need the largest exhaust diameter possible (from the head flange to the tailpipe) who don't understand scavenging and gas velocity flow basics.
I'd also note that something that's commonly done - increasing the exhaust pipe diameter further back from the engine - is actually counter-intuitively a bad thing. By increasing the pipe diameter, you slow the exhaust gas velocity, which in turn creates a greater restriction further back, as the faster-moving exhaust gases in the smaller pipe collide with the now slowing-down exhaust gases in the larger pipe. By decreasing the exhaust pipe size further from the engine - where the exhaust gases are naturally slowing down some due to wall turbulence, gas compression, and that sort of thing - those exhaust gases can actually be forced to pick up velocity without offering a negative increase in backpressure closer to the engine, resulting in a better-performing exhaust.
Now, that ignores a lot of the more advanced tech stuff, which belongs in the Advanced Tech forum to be described by people more intelligent about this subject than I am.
But, as far as longer and better worded arguments against backpressure go, here are a few links to check out:
http://www.thumpertalk.com/forum/sho....php?p=6554557
http://www.thrashercharged.com/tech_htm/exhaust.shtm
http://www.aa1car.com/library/exhaust_backpressure.htm
http://my.prostreetonline.com/forums...php?t-1639.htm
There have been threads on this site that say engine oil gets thicker as it gets hotter, by way of explaining the notion of 5W-30 multi-viscosity specs.
I'll stick with published engineering info when making my decisions about exhaust system design, and focus on the right amount of backpressure instead of aiming for zero.
Figured.
There have been threads on this site that say engine oil gets thicker as it gets hotter, by way of explaining the notion of 5W-30 multi-viscosity specs.
I'll stick with published engineering info when making my decisions about exhaust system design, and focus on the right amount of backpressure instead of aiming for zero.
There have been threads on this site that say engine oil gets thicker as it gets hotter, by way of explaining the notion of 5W-30 multi-viscosity specs.
I'll stick with published engineering info when making my decisions about exhaust system design, and focus on the right amount of backpressure instead of aiming for zero.
Funny that it seems you didn't even bother reading any of the links and probably don't understand exhaust velocity in the first place...but...whatever. That's what the interwebs is for.
However...we're talking about the entire engine, not just the exhaust system and this is where I think you've gone off track with your statement that "cars don't need backpressure." We likely agree more than you think, but that statement is misleading. Read on if you like.
You would really enjoy taking a crack at reading "Scientific Design of Exhaust and Intake Systems" which will move your focus from the exhaust pipe to the combustion chamber and cylinder where the magic really happens. Learn about cylinder filling, harmonics, and the effect of the fuel/air charge being partially blown out the still-open exhaust valve in an improperly-designed zero-backpressure system, and you'll have a ball.
