1983 Toyota Celica GT-S - Message Forum (Re: Catalytic Converter)

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Re: Catalytic Converter

Posted By: Steven Benner

Posted On: August 06, 2002 at 05:57 am GMDT

Terry wrote:

> Should I go 2 1/4 or 2 1/2 on
> the downpipe?

Either would be a good choice. What size is the cat I.D.?

> They will also build a cat byp
> ass tube for me.  It was noted
> by Steve that he would not 'r
> ecommend running a bypass tube
> on a 4-cylinder fulltime'.  D
> oes this imply that it is OK t
> o run a bypass tube on an 8-cy
> linder?

No, simply that an 8-cyl will have better resilts than a 4-cyl. I don't really recommend test pipes for anyone, including V8s, because they really don't improve the performance that much unless you will be revving to 7-8000+ rpm.

Modern cats are very free flowing. That combined with a properly sized exhaust... the restriction just dosent become much of a problem until you really start flowing some exhaust CFM.

> OR does this mean a
> catastrophic failure of some so
> rt in the motor?

No, there wont be any damage at all. You could completly take of the exhaust past the header/exhaust manifold and run fine. Backfire and noisy as hell but it will run fine.

It has been said by many sources that you need some backpressure for torque, and less backpressure for HP. I am not sure if I agree with that or not, but lots of people say that.

        Steve

Replys:

Re: Catalytic Converter - terry 08/07/02 (2)

Re: Catalytic Converter - Steven Benner 08/08/02 (1)

Re: Catalytic Converter - CATCONVERTER ELIMINATOR 12/25/03 (0)

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Message:	Steven Benner wrote: > Terry wrote: > > > Should I go 2 1/4 or 2 1/2 o > n > > the downpipe? > > Either would be a good choice. > What size is the cat I.D.? > > > They will also build a cat b > yp > > ass tube for me. It was not > ed > > by Steve that he would not ' > r > > ecommend running a bypass tu > be > > on a 4-cylinder fulltime'. > D > > oes this imply that it is OK > t > > o run a bypass tube on an 8- > cy > > linder? > > No, simply that an 8-cyl will > have better resilts than a 4-c > yl. I don't really recommend t > est pipes for anyone, includin > g V8s, because they really don > 't improve the performance tha > t much unless you will be revv > ing to 7-8000+ rpm. > > Modern cats are very free flow > ing. That combined with a prop > erly sized exhaust... the rest > riction just dosent become muc > h of a problem until you reall > y start flowing some exhaust C > FM. > > > > OR does this mean a > > catastrophic failure of some > so > > rt in the motor? > > No, there wont be any damage a > t all. You could completly tak > e of the exhaust past the head > er/exhaust manifold and run fi > ne. Backfire and noisy as hell > but it will run fine. > > It has been said by many sourc > es that you need some backpres > sure for torque, and less back > pressure for HP. I am not sure > if I agree with that or not, > but lots of people say that. > > Steve
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