Gen3 CA smog - MR2 Owners Club Message Board
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post #1 of 5 (permalink) Old November 24th, 2016, 01:13 Thread Starter
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Gen3 CA smog

I just wanted to ask and see if anybody was able to pass a smog with gen3 in CA? Stock gen3 engine, not top mount turbo or aftermarket blow off valve. Stock without EGR. To pass the proper way. I assume not but just curious.
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post #2 of 5 (permalink) Old November 24th, 2016, 11:36
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I would be interested in this as well. I know there are some members who passed a Gen2 on Gen3 electronics. My guess is based on the thoroughness of the visual (EGR) you may/may not pass...? I'm still new to CA so not totally familiar with smog here. Just had my car smogged but I can't recall if they tested the EGR or just looked at it.

I vaguely recall CRW being able to tap/place EGR's on Gen3's from reading around (but not totally sure), so that might be an option?
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post #3 of 5 (permalink) Old December 12th, 2016, 17:21
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Those that have gotten by visual inspection have usually passed the sniff test provided they have a good cat installed. For extra insurance you can put 1.5-2gal of E85 in a full tank- it should reduce NOX due to cooler burn and won't change (even marginally improve) HC and NO. However, the gen3 runs fairly lean up til around 4kRPM, so I strongly recommend NOT driving hard until that tank has been burned and refilled with regular pump gas. Particularly with the JDM ecu which runs quite a lot of timing. My data logging with UK parts was kind of worrisome enough.

There are a couple roadblocks to adding EGR aside from just drilling. But it is possible if you're serious enough:
1) As far as I know, the JDM ECU has a small hardware difference on the PCB due to not being setup for EGR. The ROM code presumably doesn't contain the code to operate it, nor does the wiring harness have the connector to plug it in.
2) The gen3 manifold is physically different. The relative angles between both ends of the mating surfaces for EGR is the same, however the distance is shorter than the gen2. If you bolted on the gen2 EGR to a drilled gen3, you'll overshoot the threads in the side of the manifold by quite a bit.
3) The UK gear for the above is not falling out of trees
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post #4 of 5 (permalink) Old December 12th, 2016, 17:27
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I know several ppl in Sac that drilled and attached EGR from the gen2 onto their gen3. Smogged and passed. Then they block off EGR after to get some HP back. I planned to do the same, however, I won't actually drill but only attach it to pass visual.

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post #5 of 5 (permalink) Old January 5th, 2017, 21:07
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CRW is able to do a EGR on a GEN3. It's fairly complicated as L0s7 has stated and isn't very cheap. But, being able to pass emissions to me is certainly worth not only not having to pay someone to "pass" but also having the peace of mind of being able to do so. Then again I had several test stations simply refuse me simply because my Gen2 (stock except for an eBay SMIC) has silicone intake hoses on it.

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