Can 33s on 3.73's pass California Smog? - Jeep Wrangler Forum
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Old 04-02-2009, 11:05 PM   #1
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Can 33s on 3.73's pass California Smog?

Hey guys. My last 4x4 was a Suzuki Samurai. Those come stock with 215 tires (about 25"). It passed smog no problem with stock tires. Later I installed 235s (about 29") but did not change the gearing. Dang thing barely passed smog with a VERY helpful and understanding tech. The computer did not like the rmp/speed relationship and kept wanting to fail me. I knew I would probably have to re-gear before the next check but always wanted a jeep so I sold in and bought an 04 Tj with the 4.0.

I have 3.73 gears and 31X10.50. Ultimate plans are 33's and 4.56s but I would like to build it in stages. So.....

Has anyone passed a California Smog test with 33" tires and 3.73 gears with a 4.0 5 speed?

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Old 04-03-2009, 01:39 AM   #2
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I passed with flying colors with 33s and 3.73s.

change the motor oil then go drive it in. motor oil is major item on the smog check. dirty oil greatly increases your chance of failing due to whats commin out of the crank case breathers.

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Old 04-03-2009, 07:33 AM   #3
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Very cool thank you
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Old 04-03-2009, 10:29 AM   #4
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Not trying to be a smart ass here, but what does tire size and gear ratio have to do with a smog test? Are they doing some kind of vehicle inspection too?
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Old 04-03-2009, 03:49 PM   #5
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So Cal smog test is done on a dyno or roller. They test emissions at idle and specific speeds I think 17 mph and 25 mph. If it was a stationary test it would have been no problem.
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Old 04-03-2009, 04:03 PM   #6
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You can cheat the system too if you don't change your speedo gear!
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Old 04-03-2009, 04:14 PM   #7
Really?

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I had no issue either with 33's once I got my emissions system fixed.
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Old 04-03-2009, 09:40 PM   #8
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So Cal smog test is done on a dyno or roller. They test emissions at idle and specific speeds I think 17 mph and 25 mph. If it was a stationary test it would have been no problem.
We don't have that up here in my area of Cal.
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Old 04-03-2009, 10:56 PM   #9
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You can cheat the system too if you don't change your speedo gear!
I question this as they do not check your speed off of your speedometer but off of the rollers.
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Old 05-25-2009, 07:25 PM   #10
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Wow thats crazy Im in northern Cali and when i first read this i was like are you kidding me but now that i read in. thats crazy that they dyno test. but i cant pass smog sationary so haaa haaa
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Old 05-26-2009, 10:57 AM   #11
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The only reason your tire size/gear ratio should effect anything is if they didn't factor in your tire size or gears, and I still don't get how that would change your emissions output. More likely, a problem had developed with the Zuke, and you simply hadn't seen it otherwise- which emissions were up? Mark W.
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Old 08-06-2009, 10:33 PM   #12
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Well 4 Point is up in the Hills, But the funny thing is my 4cyl. Made it without the dyno they called it stage 2 or something
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Old 08-07-2009, 10:10 AM   #13
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they outlawed them here in ky...
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Old 08-07-2009, 10:58 AM   #14
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We don't have that up here in my area of Cal.
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Wow thats crazy Im in northern Cali and when i first read this i was like are you kidding me but now that i read in. thats crazy that they dyno test. but i cant pass smog sationary so haaa haaa
Yeah they have been doing it with the dyno in the SF Bay Area for a few years now.
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Old 08-07-2009, 12:59 PM   #15
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Yeah got mine done 2 months ago in SF east bay on the dyno.
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Old 08-15-2009, 11:32 AM   #16
Knows a couple things...

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One thing to keep in mind is to make darned sure your engine is as hot as possible just before the test which will help it pass. The only time my TJ barely failed the test was when it wasn't warmed up fully before the test started. The tech told me to go drive it to get it fully warmed up and it passed after that.
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Old 09-11-2009, 11:40 PM   #17
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Thanks for these information
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Old 09-11-2009, 11:52 PM   #18
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why not just keep a set of stock tires to throw on for the test no testing he in michigan so i gess i dont understand is it a random thing or do you know ahead of time
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Old 01-16-2010, 11:39 AM   #19
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Hey u.p.jeeper, Unfortunatley in California they do smog test on vehicles every 2 years, Thats what is keeping me from swapping out my 2.5 on my 90 YJ.It's not easy to build a jeep in California. Just thought you would want to know.
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Old 01-16-2010, 02:19 PM   #20
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Heh Heh, man ain't that the truth, I had my Yota done here in Ca. NorBay (with Dyno), but My jeep is registered in Nevada and will never need to be smogged ( never say never)

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