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Discussion Starter · #1 ·
Just curious. Where i live in canada we have no emmisions laws. I i'magine it would give a good gain, because of where it is located on our cars....... :?
 

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if its clogged, removing it will help some yes.. if it still works and all, no point in removing it really since its not a restriction.

common myth that the catalytic convertor on normal everyday cars is a big hog of a restriction.. nah, only when they were first implemented.

i tool mine off of my pony and it didnt do anything.
 

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Without a cat you car will have a nasty bumble bee/raspy sound to it. A turbo will muffle it big time, without a turbo I think it sounds bad.
 

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I didn't put a cat back on when I did the header....and it sounds like crap....really rips the inside of the muffler apart too...it got to the point where I didn't want to be seen in the car and ended up putting a hi-flow one in.
 

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go hi-flow cat if you want more airflow in there.

a few years ago my exhaust rotted out right by the cat. it sounded horrible!!! except for when you revved it up like mad. heheh, i made a guy in a civic look around when i reved at him. (i was 16, everything you do in a car is awesome when you're 16). it made my day.

but yeah, whatever you do: don't remove the cat!
 

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Discussion Starter · #6 ·
ok lets put the sound aspect aside, since i would add a resonator further down the exhaust to kill the bee sound. Does it give a good gain removing it? Like i said i assume it would since the cat is right st the beginning of the exhaust
 

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no. the horsepower that the escort has is entirely dependant on backpressure. if you don't give it enough backpressure, you lose out on hp.

hi-flow cats are slightly larger in diameter than the stock cat which give it more flow, enough to where it give it horsepower rather than take it away.
if you remove the cat, you're giving it too much air flow, reducing backpressure, and reducing horsepower.
 

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Discussion Starter · #11 ·
well think of it this way. If you put a cat back exhaust on it you are decreasing back pressure and increasing velocity, and flow. Well if you just cut out the cat, and had a stock exhaust system, the flow should be the same, so i dont see a hp loss.
 

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Roddy said:
well think of it this way. If you put a cat back exhaust on it you are decreasing back pressure and increasing velocity, and flow. Well if you just cut out the cat, and had a stock exhaust system, the flow should be the same, so i dont see a hp loss.
Yes theres no hp loss and there also is no gain.
 

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Discussion Starter · #13 ·
No there has to be gain. If you put a header on that decreases backpressure, improves scavenging and increases velocity. In return you get more HP.

I think your talking about losing torque. ??
 

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I think what we need is two people to have their cars dynoed.One that has the cat on still and one without the cat.To see if you gain or lose hp or it stays the same.
 

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i think most of you are full of crap and dont know what youre talking about.

until someone can show me exhaust related fluid dynamics equations based on exhaust pipe diameter and length at any given temperature and pressure and how that correlates to a a gain or loss in power produced by an engine with less than 100hp......... you know where im going with this.

my point is this, take off the cat if you want to, dont if you dont want to, i dont care. Im telling you there is no substantial gain in power on a Ford 1.9l SEFI engine unless the current unit is clogged or internally ruptured or the entire exhaust system is re-engineered.

a header doesnt neccessarily decrease backpressure either.. it depends largely on primary pipe size and secondary pipe length.

i dont tell ppl what to do to their cars, just what will happen if they do something.
 

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Yep, exactly what pony said...the car's 88hp stock...if you take a converter out, you will feel no difference at all in power or torque. It will sound like a bag of crap though. I took my resonator out when replacing the exhaust when the converter was still in it and it didn't sound ANY different at all.
 

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to add to this, when i had my new 2.25" exhaust put on my gt, the cat wentbye bye cuz it was all falling apart right off the car.. well, with the muffler i had on there it was super loud, i welded in a glasspacked resonator.. to quiet it down ya know..

needless to say that the resonator did diddly squat except make me 20 bux poorer.
 

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Discussion Starter · #19 ·
Yeah i think alot of things in this thread are a load of crap too.

I can offer this up. I have G-tech. I can get some numbers to go off of from that.
 
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