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?
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.
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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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.