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Re: Loss of power [Re: Nukeiridium] #968841 10/23/09 01:41 AM
Joined: Jun 2006
Posts: 3,814
Hydra747 Offline OP
Roll Me Over
*
I first noticed the change of the sound while in the lower gears and of course the power loss........

Sounds like aliens snuck in at night and changed my muffler for me! <img src="/forums/images/graemlins/lol.gif" alt="" />

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Re: Loss of power [Re: Hydra747] #968842 10/23/09 04:33 AM
Joined: Mar 2005
Posts: 265
S
sportagebandit Offline
Mudrunner
empty the cat and save 400 bux.


96 SPORTAGE 4 DOOR:1 3/8 body lift:eibach springs & spacers:15x8 rockcrawlers & 31x11.50 super swampers:warn hubs:winch bumper http://www.cardomain.com/ride/2115301
Re: Loss of power [Re: sportagebandit] #968843 10/23/09 05:32 AM
Joined: Dec 2004
Posts: 240
blitz Offline
Wheeler
ive wanted to do this. my exhaust is toast right now,has been for months. tryin to decide how to approach this. interested to see how this turns out.will help with my decision.
or we could ship our kias to banks turbo and tell em dont call me, till it's pullin the front wheels off the ground..that would be cool. $$$$

Re: Loss of power [Re: blitz] #968844 10/23/09 07:45 AM
Joined: Dec 2008
Posts: 336
2002_Sporty Offline
Mudrunner
Quick question while were waiting to see what's up with Hydra747's truck.

Can I delete the second catalytic converter or place a high flow glasspack in there without screwing anything up.

If I punch out the internals on the first catalytic converter will this screw anything up?


2002 4dr Kia Sportage 4X4
Tires:235/75/15, Wheels: Black 15x8 Steel ProComp 2.5" B.S., Hubs:Warn Manual, Lift:3" UPYOURKIA, Trailer Hitch, Cargo Rack, Clinometer.
Re: Loss of power [Re: 2002_Sporty] #968845 10/23/09 07:53 AM
Joined: Feb 2003
Posts: 2,243
DamKia Offline
Kia Moderator
Quote
Quick question while were waiting to see what's up with Hydra747's truck.

Can I delete the second catalytic converter or place a high flow glasspack in there without screwing anything up.

If I punch out the internals on the first catalytic converter will this screw anything up?


In short, no, and yes.

Both cats are needed for the ECU to operate correctly. Doing either of what you have suggested will result in the ECU reverting to "limp home" mode and WILL NOT improve anything (poor fuel consumption, poor performance). Cats these days have almost no effect on the exhaust gas flow, so there is absolutely nothing to be gained from trying to eliminate them.

Worst case scenario is that you will be up for new O2 sensors as well due to contamination.


2002 Sporty , Ironman 2.5" spring, 2" body, 15 x 7 ROH wheels, K&N, 15 x 10.5 Simex Centipedes, Powerchip 91.

"Never argue with an idiot. They will bring you down to their level then beat you with experience!"
Re: Loss of power [Re: DamKia] #968846 10/23/09 10:12 AM
Joined: Dec 2008
Posts: 336
2002_Sporty Offline
Mudrunner
Thanks DamKia,

Always in search of more power.


2002 4dr Kia Sportage 4X4
Tires:235/75/15, Wheels: Black 15x8 Steel ProComp 2.5" B.S., Hubs:Warn Manual, Lift:3" UPYOURKIA, Trailer Hitch, Cargo Rack, Clinometer.
Re: Loss of power [Re: 2002_Sporty] #968847 10/23/09 11:36 AM
Joined: Aug 2008
Posts: 19
C
cheapkia Offline
Need a Spot
I have a saturn that both the cats went bad on and I didn't have the money at the time to replace them so I cleaned them both out and the car ran great no problems at all and it's an odb2. When it came time to smog I replaced the second cat only and it passed with flying colors and that's how it runs today. The only thing cats are for is smog. You will get a cel with empty cats but that's all mpgs and performance will be the same as if you had new cats on the car.

Re: Loss of power [Re: DamKia] #968848 10/23/09 12:10 PM
Joined: Mar 2002
Posts: 4,497
Axe Man Offline
Kia Moderator Emeritus
Quote
Quote
Quick question while were waiting to see what's up with Hydra747's truck.

Can I delete the second catalytic converter or place a high flow glasspack in there without screwing anything up.

If I punch out the internals on the first catalytic converter will this screw anything up?


In short, no, and yes.

Both cats are needed for the ECU to operate correctly. Doing either of what you have suggested will result in the ECU reverting to "limp home" mode and WILL NOT improve anything (poor fuel consumption, poor performance). Cats these days have almost no effect on the exhaust gas flow, so there is absolutely nothing to be gained from trying to eliminate them.

Worst case scenario is that you will be up for new O2 sensors as well due to contamination.



Gary, not quite correct, at least for 1998 and newer Sportages in North America.

The cat that is bolted to the exhaust manifold is indeed monitored by the ECU from the rear O2 sensor. You cannot remove or gut this converter. It is required for emissions as well as keeping the ECU happy and CEL free.

The second cat under the driver on left hand drive is not monitored. It can be removed or gutted with no driveability effects other than slightly higher emissions. If your state/province conducts tailpipe emissions tests on an annual inspection you might fail. But other than that the ECU will never know it's been removed or gutted.

This does NOT apply to 1997 and older Sportages in North America. They have one cat under the driver and it is monitored by the ECU.


1998 Sportage - Gone.
2004 Honda Civic Coupe.
2007 Suzuki Grand Vitara - She got it.
Re: Loss of power [Re: Axe Man] #968849 10/23/09 12:27 PM
Joined: Dec 2008
Posts: 336
2002_Sporty Offline
Mudrunner
Thanks Axe Man,
I'm in North America. I want more power and a throaty exhaust to combat all those duel exhaust pickups here in Alaska. Loud is safe, people shooting in the woods know your out there wheeling.

Hope Hydra figures out what the hell is going on with his rig. I'm a night time security guard and can't wait for the next post on this issue. Information here on the Kia-Forums is a gold mine.


2002 4dr Kia Sportage 4X4
Tires:235/75/15, Wheels: Black 15x8 Steel ProComp 2.5" B.S., Hubs:Warn Manual, Lift:3" UPYOURKIA, Trailer Hitch, Cargo Rack, Clinometer.
Re: Loss of power [Re: 2002_Sporty] #968850 10/23/09 02:21 PM
Joined: Dec 2007
Posts: 316
H
homerdog Offline
Mudrunner
I've been running mine with both cat's gutted for a few months now. I put a spark plug extender on the O2 sensor to get it out of the exhaust stream and it seems to work fine with no CEL. BTW it sounds better and it might have a little more pep to it, it is a manual though so it's easier to notice the little things.


2001 Sportage, TJ 106's, Everet spacers and bumpstops, Bilstein shocks on the rear, cone filter, Crager wheels, 235-75-15 Goodyear tires. Custom front winch bumper by Dave Scott. Currently DOA, but it is a work in progress.
2011 Kia Forte EX
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