 Running no cat |
 Jan 7, 2004 - 11:28 PM
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Enthusiast  Joined Dec 13, '03 From Alabama Currently Offline Reputation: 1 (100%)  |
Tomorrow I'm going to get some custom exhaust pipe made for my celica. I was wondering how much louder it would be without cat. I am gonna have 2 1/4 in piping with no resonators and a muffler. Also, I heard that if you dont have a cat there will be a very noticable smell indicating you dont have one. Third, would it give me any hp gains since the midpipe would now be 2 1/4 Last, how easy would it be for a cop to tell that you dont have one. I live in alabama and we dont have to go through any emissions or vehicle inspections
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Jan 8, 2004 - 5:45 PM
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 Enthusiast Joined Aug 29, '02 From Dallas, Tx Currently Offline Reputation: 0 (0%) |
No. I think you're thinking the right thing but calling it the wrong thing. Backpressure is ALWAYS ALWAYS ALWAYS bad. Anything you can do to get the air into or out of your engine more efficiently is good (when you have the proper amount of fuel to go with it). What isn't good is reducing the velocity of that air too much, thats what kills the torque. When you have a given flow through a tube and you increase the size (area) of the tube while keeping the flow rate the same, the velocity will decrease. All this moving air has an inertia. Since the flow rate stays roughly the same, the faster the air moves, the more inertia it has. This is what your engine relies on to help scavenge the cylinders and what creates the torque. A good exhaust system will strike a balance between the velocity and the flow losses due to the length and diameter of the pipe. Sorry if that doesn't make sense or is disorganized....I've had a really bad day and its far from over....unless I finally get so pissed off that I quit my job and go home.... |
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Posts in this topic
Justin Running no cat Jan 7, 2004 - 11:28 PM
FallenHero NO WE DON'T welcome to the board!
If you... Jan 7, 2004 - 11:49 PM Coomer I'd keep your cat on...you probably need it fo... Jan 7, 2004 - 11:52 PM Phat_99CeliGT Instead of removing the cat, get a header.
It elim... Jan 8, 2004 - 12:28 AM dcgoalie312 i got my cat removed as soon as i got my car cuz i... Jan 8, 2004 - 9:28 AM SpedToe169 QUOTE Instead of removing the cat, get a header.
I... Jan 8, 2004 - 9:44 AM Coomer QUOTE (SpedToe169 @ Jan 8, 2004 - 6:44 AM) Coomer.... Jan 8, 2004 - 1:18 PM Justin thanks for the advice
I'll be keeping my cat Jan 8, 2004 - 1:54 PM Uppitycracker QUOTE (SpedToe169 @ Jan 8, 2004 - 7:44 AM) Don... Jan 8, 2004 - 2:13 PM wind that rotten egg smell is the cat smell.... the cat... Jan 8, 2004 - 3:34 PM Uppitycracker QUOTE (wind @ Jan 8, 2004 - 1:34 PM) that rotten e... Jan 8, 2004 - 3:43 PM Justin I just got my exhaust completed a ffew hours ago a... Jan 8, 2004 - 9:31 PM
Doge The purpose of a cat is to take away all the envir... Jan 10, 2004 - 2:18 AM |
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