Cat or no Cat ?? That is the question

Does anyone have any actual figures on the difference it makes to a
P11 SR20DE with the Catalytic Converter removed ?
I removed it from my P10 eGT & found it would rev more freely
& less hesitation low down, but thats just how it felt.
Anyone know the facts ??? George ????

Originally posted by nismo_gt
Does anyone have any actual figures on the difference it makes to a
P11 SR20DE with the Catalytic Converter removed ?
I removed it from my P10 eGT & found it would rev more freely
& less hesitation low down, but thats just how it felt.
Anyone know the facts ??? George ????

I don't know for sure if someone has tested the SR20DE or not, but Sport Compact Car tested the KA24DE with and without the cat. It actually lost 1 hp and (IIRC) had the same torque w/o the cat.

i bet on a turbo, the cat would gain a lot of power.

Good luck passing emissions tests :)

dont forget hes in the UK, emissions might not be that strict, not sure though :confused:

giving off like a million billion times as much crap into the air for 3hp or so isn't the nicest thing to do..

Then the Cat stays !, Thanks :)

Turbo it :). Then you'll have a non-cat excuse.

Originally posted by ricecube77
Turbo it :). Then you'll have a non-cat excuse.

I would still keep the cat.

IMO, Not really worth the time and effort.

My cat is removed.

I noticed slight power loss, but it wound out faster.

When I run my Nitrous, it works well.

Do you run with a cat on the street and just not at the track? or no cat all the time?
Also, FWIW i'd run a cat all the time, regardless of tune, just because I couldn't stand that blatty ass noise that cars make without a cat. Or at least the ones i've heard.

Originally posted by nismo_gt
Does anyone have any actual figures on the difference it makes to a
P11 SR20DE with the Catalytic Converter removed ?
I removed it from my P10 eGT & found it would rev more freely
& less hesitation low down, but thats just how it felt.
Anyone know the facts ??? George ????
You might have a clogged cat then. You can get high flow ones for a pretty good price now days.

But where do we get da high flow cat's from and what kind of price we talking about?:confused: