Effects of high flow cat?

[Dptm]

are there any significant effects (good & bad) in changing the stock cat to a high flow one?

will the low-end or high-end torque be affected?

thanks.

[Madarmour]

are there any significant effects (good & bad) in changing the stock cat to a high flow one?

will the low-end or high-end torque be affected?

thanks.

 

Using the high flow cat will be almost similar to removing the cat but legally. You should be able to reduce some 'lost' power and the throttle response will be better.

[Dptm]

pardon my ignorance, there is still "something" in side the high flow cat, am i right?

it is not a straight thru, where u can see the light at the other end?

[Pauly75ts]

Hi! there, Dptm,

 

The high flow cat isn't a straight thru, it's less restrictive than a stock one. it'd increase the hp by a bit.

 

Rgds

 

Paul Yong

[Dptm]

Hi! there, Dptm,

 

The high flow cat isn't a straight thru, it's less restrictive than a stock one. it'd increase the hp by a bit.

 

Rgds

 

Paul Yong

 

so can i say "save the money for something else"?

the only mods i have done are plug cables, spark plugs and drop-in filter.

will this help to complement the high flow cat?

[Pauly75ts]

Hi! there, Dptm,

 

Power cost, so there's no way you'd get it unless you are willing to pay. That's why I didn't go for the power increase, so spend more time improving my handling of the car.

 

Rgds

 

Paul Yong

[Mondeo]

NOS..NOS...

[Madarmour]

pardon my ignorance, there is still "something" in side the high flow cat, am i right?

it is not a straight thru, where u can see the light at the other end?

 

Of course there's still something inside, or else it won't be called a cat anymore, right? A catalytic converter's function is to convert noxious gas to harmless gas. There are a lot of 'elements' inside so naturally these restricts air flow. A race cat still has 'elements' inside but maybe arranged in a way that reduce the restriction, in other words, improve the flow. Bear it in mind that the flow is still less than a straight through.

[Madarmour]

so can i say "save the money for something else"?

the only mods i have done are plug cables, spark plugs and drop-in filter.

will this help to complement the high flow cat?

 

You want to use a high flow cat if you want to play by the rules and be enviromentally friendly. A high flow cat still flow slower than a straight through. May I suggest an extractor to go along with your high flow cat and at the same time, wrap the extractor with fibreglass or other heat insulator tape before installation?

[Dptm]

thanks guys for the feedback.

so in your opinions, is it advisable/worth it to go for the high flow cat in terms of the improvements over the money spend on it?

have not check on the price yet but was told it can be done at around $100 +-, for a normal brand, right?

[Madarmour]

thanks guys for the feedback.

so in your opinions, is it advisable/worth it to go for the high flow cat in terms of the improvements over the money spend on it?

have not check on the price yet but was told it can be done at around $100 +-, for a normal brand, right?

 

So cheap meh? What 'normal' brand? IMO, an extractor, together with a straight through/free flow cat is worth the money. Much more than the 2 pcs ($500) of Calski fuel ionizer! I think that Calski thingy is a rip-off.

 

Just my $0.02!

 

Cheers!

[Dptm]

i am referring to the high flow cat alone, sorry for the confusion caused.

[Madarmour]

i am referring to the high flow cat alone, sorry for the confusion caused.

 

And I'm saying if you want more out of it, get the extractor too. The high-flow cat will give you just a bit of improvement.

[Yongwd]

hmm, pardon me for my ignorance. Will having a high catalytic convertor has drastic improvement on fuel consumption? Or fuel consumption may suffer instead?

 

Say if my old old car wanna renew a cat, should I use high flow for low cc cars (less than 1.6L) and stick to original extractor/rear muffler?

 

Any advise appreciated.

[Pauly75ts]

Hi! there, Shagmobil,

 

Friend!! how come your oldold car has a cat? While my old car doesn't, [ scratching head like a monkey ]

 

Any liberation of power from your engine will definitely cause an increase in consumption. Now, listen, like Doc said, a change to include the exhaust manifold & high flow cat will give a better output from the engine. Some claim increase to 30HP, depending on your car model.

 

Rgds

 

Paul Yong

[Yongwd]

my lao pok gai car a 92 corolla XLi has a cat, a big fat cat!!!

 

dun think my oldie rollie can improve anything. Guess I stick to stock since fuel is rather expensive now.

 

 

Hi! there, Shagmobil,

 

Friend!! how come your oldold car has a cat? While my old car doesn't, [ scratching head like a monkey ]

 

Any liberation of power from your engine will definitely cause an increase in consumption. Now, listen, like Doc said, a change to include the exhaust manifold & high flow cat will give a better output from the engine. Some claim increase to 30HP, depending on your car model.

 

Rgds

 

Paul Yong

[Madarmour]

hmm, pardon me for my ignorance. Will having a high catalytic convertor has drastic improvement on fuel consumption? Or fuel consumption may suffer instead?

 

Say if my old old car wanna renew a cat, should I use high flow for low cc cars (less than 1.6L) and stick to original extractor/rear muffler?

 

Any advise appreciated.

 

Bro, I no understand your sentence as the cat, extractor and rear muffler are mutually exclusive! OK, lets try to understand the exhaust system first or else everyone is talking in a different frequency!

 

Lets start from the engine to the exhaust tip.

 

1) The exhaust system starts from the headers. It is also known as the extractor/exhaust manifold. It collects exhaust from all the cylinders.

 

2) The header is connected to the cat converter. When ppl say they want to remove the cat, it means they have to replace that cat with a free flow cat, a silencer or a straight through.

 

3) After the cat, there's a centre tube which empties into the last box, called a......

 

4) Muffler. The function of the muffler is to reduce the exhaust note.

 

The above is a simple exhaust system of a NA engine. Some may have another box in-between the cat and muffler. Now that we have understood the exhaust system, lets ponder your questions.

 

 

The reason of replacing your cat with a high flow cat/ silencer/ straight through is to free up the restriction. Changing the centre tube to a larger diameter one and replacing the muffler to a performance one has the same effect. All these mods, if done properly will regain some of the 'lost' power from the engine. Fuel consumption should not increase but if you drive harder due to your mods, of course the consumption will suffer!

 

 

Even if you renew your cat, you still have to stick with your original extractor and muffler, unless you want to change them too. Bear in mind that the cat has a life span and needs to be replaced once the internal elements expires. Want to improve performance but still be enviromentally friendly, change into a free flow cat. Want even better performance but don't care about the enviroment, change into a silencer or a straight through.

 

Mu $0.02!

 

Cheers!

[Yongwd]

Yo Mike,

 

thanks for de tip, so having a free flow cat will add potential on your car and will not and should not consume more petrol unless driven harder then normal after mod.

 

i will not decat my car.

Edited June 28, 2002 by Turbobrick