Subject	The cats need a 'Close to Stoch Mixture' to run.
Posted by	Cjw3 on May 01, 2022 at 10:08 AM
	This message has been viewed 162 times.
In Reply To	Vid Link for Zed Cat Test posted by Cjw3 on April 30, 2022 at 11:03 AM
Message	This Vid was a test to see if I could keep the Cats Hot while Idling. Initially the ECU would not adjust itself to keep the Mixture close to Stoch to keep the Cat Lit off.. The Fuel Mixture would fall off to lean, and the Flame would go out, and the Cats would get cold. After some Discussions, Research and Tuning, I was able to adjust things to get the 'Mixture' Richer at Idle, so the ECU would be in the range necessary to make mixture corrections, to keep the Cats Running. My Opinion is the Fuel now is different than the fuel of the 90's, and the Closed Loop Tuning Range of the ECU at idle is not enough to adjust for the requirement of moor fuel necessary to keep the O2's at Lambda. My Z does not go over the rollers, it just does the Stationary Test.. Last test was <10 Hc on both the Idling at 2500 RPM test. The Smog Tech said I was running about 16:1 Idling Mixture at test time. Looks like it needs to have a little more fuel at Idle Cj
Follow Ups	SMOG question - ChrisZTT(Sacto, CA) 16:25:58 04/26/22 Since it fails on all 3 tests, the cats are not working - Bernie (NoVA) 20:58:17 04/26/22 Re: Since it fails on all 3 tests, the cats are not working - ChrisZTT(Sacto, CA) 21:03:54 04/26/22 I don't remember the timing. I can check later. (n/m) - ChrisZTT(Sacto, CA) 21:10:13 04/26/22 Cats should be colder in the front, hotter in the back right - ChrisZTT(Sacto, CA) 21:02:48 04/26/22 It should be hotter or at least the same at the rear... - Ted (92TT) 17:10:03 04/27/22 It idled on the lift for about 20 min prior to measuring. - ChrisZTT(Sacto, CA) 18:44:49 04/27/22 Please don't start to do random shit. - Bernie (NoVA) 21:45:58 04/27/22 Some answers - ChrisZTT(Sacto, CA) 01:54:37 04/28/22 Did they say what "Modified-Other emissions" was for? - Ted (92TT) 03:08:57 04/29/22 Down pipes. Going to wrap them and take somewhere else. (n/m) - ChrisZTT(Sacto, CA) 10:48:33 04/29/22 I thought about fabbing up some shields... - Ted (92TT) 22:29:52 04/29/22 More info - ChrisZTT(Sacto, CA) 20:22:12 05/05/22 How cats work: - Bernie (NoVA) 21:55:57 04/27/22 Re: How cats work: - robo (sebring1970) 01:48:50 05/06/22 Vid Link for Zed Cat Test - Cjw3 11:03:38 04/30/22 The cats need a 'Close to Stoch Mixture' to run. - Cjw3 10:08:07 05/01/22 Do you think 87, 89 or 91 octane would be better for testing (n/m) - ChrisZTT(Sacto, CA) 20:23:48 05/05/22 I herd lots of stories, nothing valid in my opinion (n/m) - Cjw3 06:27:02 05/06/22 Just a follow up... I PASSED! - ChrisZTT(Sacto, CA) 23:21:24 05/10/22 Awesome, congrats! Did you do anything new for the visual? (n/m) - Ted (92TT) 01:30:28 05/12/22 On the original cats? (n/m) - NytWolf 11:44:08 05/19/22
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