What are the pros and cons of going without a catalytic converter
02-20-2017, 01:16 PM
#22
Senior Member
This is one thing I have never understood. Does LOUD exhaust make your private parts bigger? Do women chase after you and beg to have your children? Does everyone shake with fear when they hear you coming? I'm pretty sure the answer to all of the above is a resounding NO! So what is the big turn on for loud pipes? I've owned probably 30 to 40 different race cars with only open headers for exhaust, but they were not made to be driven in public. Why should I be forced to listen to you pretend to be something your not, while I'm driving to work?
02-20-2017, 02:18 PM
#23
Senior Member
To summarize, there is one con: it's a violation of Federal law.
Everything else is a pro: less heat surrounding your transmission, better flow, more power, smoother throttle, less weight, no fears of clogged cats, no fears of a thief taking a saw to your truck after dark, etc.
But as mentioned, you'll likely want a tuner to disable the sensors so you don't get a code stored in the ECU.
Everything else is a pro: less heat surrounding your transmission, better flow, more power, smoother throttle, less weight, no fears of clogged cats, no fears of a thief taking a saw to your truck after dark, etc.
But as mentioned, you'll likely want a tuner to disable the sensors so you don't get a code stored in the ECU.
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johnday in BFE (02-20-2017)
02-20-2017, 07:50 PM
#24
Senior Member
So you had the motor out and on an engine dyno (not a chassis dyno as you noted crank improvements) and made runs with and without cats and that was the only change?
02-20-2017, 08:06 PM
#25
And yet a Tesla will leave the loudest car sitting still. LOL WHIRRRRRRR nuttin but tail lights.
02-20-2017, 08:14 PM
#26
Senior Member
02-20-2017, 08:36 PM
#27
Yep. Saw it first hand one day on the way home. It took off and was down the road before the first car even got moving. Of course it probably used 30 miles of its range in that showboating move.
02-21-2017, 11:55 AM
#28
Senior Member
I don't doubt the dyno numbers, I doubt you gained that much by simply removing the cats. Test have been done and over done and shown minimal gains with the removal of modern cats.
So you had the motor out and on an engine dyno (not a chassis dyno as you noted crank improvements) and made runs with and without cats and that was the only change?
So you had the motor out and on an engine dyno (not a chassis dyno as you noted crank improvements) and made runs with and without cats and that was the only change?
But one of the OEM cats looked like this....lol
I did also notice a difference with the 'ol butt dyno when I swapped out the entire exhaust (headers to tips) on my 95 Mustang GT. I did replace the OEM cats with a BBK set of high-flows. I can't speak to actual numbers, as I never put it on a dyno.
IMHO, if I do anything with the OEM cats, they are replaced with high-flows. I see little gain with any of the modern engines after looking at various dyno sheets and testing anyway. I can't stand the stink of not having cats and like the idea that I can pass a vehicle inspection or sell the vehicle onto the next owner without them having any issues.
02-21-2017, 12:10 PM
#29
Senior Member
Blown,
So safe to safe a big part of the gains was in the long tubes and full duals. However in your case those cats are starting to plug up so some gains there as well
So safe to safe a big part of the gains was in the long tubes and full duals. However in your case those cats are starting to plug up so some gains there as well
02-21-2017, 12:38 PM
#30
Senior Member
That's incorrect. Without being able to read the O2 sensors, an error code of not ready will be thrown and the test will be incomplete. The tester has to be able to read the sensor heater voltage, no sensor, no heater data.
This is why some tuners have to be returned to stock and then driven for a period of time before a test will be successful. Then after the test, return to the tuner.
This is why some tuners have to be returned to stock and then driven for a period of time before a test will be successful. Then after the test, return to the tuner.