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gutting downpipe
Posted: Mon Dec 30, 2002 11:18 pm
by IggDawg
any reason I can't just take the downpipe off and drill/smash/crush/push/generally eliminate the cat? Everyone raves about new dp's, and I'm not getting inspected for another year now. on top of that I've heard of people running catless passing inspection. Anyways, are there any dangers from gutting the downpipe other than risking speeding tickets?
Posted: Tue Dec 31, 2002 3:25 am
by Legacy777
no.....not that I can tell...
Posted: Tue Dec 31, 2002 8:27 am
by Aaron's ej22t
I would not recommend it. the cat material is dangerous stuff from what i have heard. you don't want to be grinding that up. i recommend you either spring for a custom dp or an aftermarket one.
Posted: Tue Dec 31, 2002 10:58 am
by LegacyT
Just get a custum one done or get a prefab like the HKS for 150 bucks or so, and keep the stock downpipe around. You never know in your area it might not pass emissions. Or if you sell the car the new owner may want it returned to stock. Then what? You'd have to shelve out for a new or used stock downpipe which would be $$'y.
Mark,
Posted: Thu Jan 02, 2003 4:38 pm
by omahasubaru
I have a question for you guys with aftermarket catless down pipes... Does your ECU through any CEL codes or anything from taking the cats out... or does the OBDI not have issues with this?
Thanks - Jon
Posted: Thu Jan 02, 2003 4:54 pm
by boostjunkie
No CE lights, no driveability problems.
Posted: Thu Jan 02, 2003 5:45 pm
by Legacy777
As mentioned, OBD1 computers don't have a second O2 senser for cat efficiency. So no you won't get any CEL's
Posted: Thu Jan 02, 2003 5:51 pm
by IggDawg
so we just have the one wide-spectrum cat? schweet.
-IggDawg
Posted: Thu Jan 02, 2003 8:22 pm
by Legacy777
no.....we have the one wide spectrum O2 sensor
Posted: Thu Jan 02, 2003 9:15 pm
by boostjunkie
So are you saying that I could hook up an a/f gauge to the stock o2 sensor and get some REAL values outta it?
Posted: Thu Jan 02, 2003 9:21 pm
by IggDawg
Legacy777 wrote:no.....we have the one wide spectrum O2 sensor
Smartass
.
Posted: Thu Jan 02, 2003 10:49 pm
by eastbaysubaru
Good question Boostjunkie. Anyone?
-Brian
Posted: Thu Jan 02, 2003 11:28 pm
by IggDawg
If it's anything like the WRX wideband O2 sensor, it'll have a base voltage like 3.5V (on the WRX). A change in this voltage in either direction (IE 3.2 or 3.8 for example) would signify a leaner or richer mixture. The ECU actually reads a milliamp signal, but the information can be gathered by voltage also.
Posted: Thu Jan 02, 2003 11:48 pm
by Legacy777
The FSM gives the following info.
At idle, the O2 sensor should read between .1 - 1.0 V
(MT) 1.0 V would signify rich mixture
(MT) 0.2 V would signify lean mixture
(AT) 0.7 V would signify rich mixture
(AT) 0.0 V would signify lean mixture
Posted: Fri Jan 03, 2003 10:10 pm
by boostjunkie
Hmmmm, those numbers seem similiar to the values given for my obd-2 o2 sensor in the GT . . . Now I gotta figure out what the bosch wideband o2 sensor outputs are . . .
Anybody know?