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Best CA smog-legal tune?

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Old Dec 21, 2019 | 10:17 PM
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Best CA smog-legal tune?

Any recommendations on the best CA smog-legal tune for our cars? I currently have EC, but I have to keep flashing back to stock when I go in for a smog check. After an ecu scare this year, I'd like to just tune it and not mess with it (after a recommendation from another member whose name I don't recall, apologies).
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Old Dec 21, 2019 | 11:57 PM
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I'd reckon Weistec, Renntech and Kleemann. I think OE has one too.
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Old Dec 22, 2019 | 12:24 AM
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Do you have cat deletes? Otherwise I can’t see a tune making you fail emission, unless the tuners are shutting off secondary o2 monitors for some reason?

Last edited by deadlyvt; Dec 22, 2019 at 01:10 AM.
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Old Dec 22, 2019 | 01:13 AM
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Originally Posted by G_Money
I'd reckon Weistec, Renntech and Kleemann. I think OE has one too.
Thanks.
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Old Dec 22, 2019 | 01:15 AM
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Originally Posted by deadlyvt
Do you have cat deletes? Otherwise I can’t see a tune making you fail emission, unless the tuners are shutting off secondary o2 monitors for some reason?
No cat delete, car is stock besides the EC tune. I know for a fact that not all of the monitors set when I have the tune on the car, I checked it with my OBD2 scanner.

Last edited by m a x i m u s; Dec 22, 2019 at 01:28 AM.
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Old Dec 22, 2019 | 02:17 AM
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Did you check with ec if they will reset the monitors? Should be no reason they are off with just a standard tune
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Old Dec 22, 2019 | 03:24 PM
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Originally Posted by deadlyvt
Did you check with ec if they will reset the monitors? Should be no reason they are off with just a standard tune
I did email Jerry on Friday evening and I'm waiting for his response. I just thought I'd bother you guys here in the meantime. 😊
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Old Dec 22, 2019 | 04:46 PM
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Technically none are smog legal as none are certified, but any should go through smog if you have cats and the tune is not turning off the 02 monitors, my last EC tune had the monitors all active as I was stock and would go through any OBD checks.
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Old Dec 22, 2019 | 04:46 PM
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I have a few oe files that keep all emissions system on including race gas files.

I'm sure any tuner can give you what you are looking for. I think the car runs better with them on. Throttle feels a little more sharper.

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Old Dec 22, 2019 | 07:22 PM
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Originally Posted by roadkillrob
Technically none are smog legal as none are certified, but any should go through smog if you have cats and the tune is not turning off the 02 monitors, my last EC tune had the monitors all active as I was stock and would go through any OBD checks.
Thanks, Rob. Are you in CA? You can PM if you don't want to publicize. I'm on my iPhone, so don't see if you've indicated your state.
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Old Dec 22, 2019 | 07:23 PM
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Originally Posted by skratch77
I have a few oe files that keep all emissions system on including race gas files.

I'm sure any tuner can give you what you are looking for. I think the car runs better with them on. Throttle feels a little more sharper.
Thanks, man. I'll see what Jerry says. I guess I could always just try to smog it with the tune on and if it fails, then flash it back to stock, but I'm a little paranoid about flashing my ecu excessively after a recent scare, which I mentioned.
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Old Dec 22, 2019 | 10:17 PM
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any tuner should be able to provide you the same tune with or without cat deletes.

ask for an updated EC tune. generally speaking, modifications to engine computers of any kind is not legal.
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Old Dec 23, 2019 | 01:46 PM
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As you guys have said, Jerry replied that it won't pass if catless but should pass if catted. I guess I'll stick with my V5 and cross my fingers. Thanks, all.
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Old Dec 23, 2019 | 02:59 PM
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Originally Posted by roadkillrob
Technically none are smog legal as none are certified, but any should go through smog if you have cats and the tune is not turning off the 02 monitors, my last EC tune had the monitors all active as I was stock and would go through any OBD checks.
You're wrong. The Weistec Stage 1 tune has CARB EO# D-691-3, meaning that it's smog legal for use in CA. Not many tuning companies go through the process of getting their tune smog legal.
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Old Dec 24, 2019 | 12:38 PM
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Originally Posted by EkS
You're wrong. The Weistec Stage 1 tune has CARB EO# D-691-3, meaning that it's smog legal for use in CA. Not many tuning companies go through the process of getting their tune smog legal.
Good to know, I knew they had a carb legal blower setup, didn't realize they certified a standalone tune, so guess there is one option then that is smog legal.
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Old Apr 13, 2021 | 02:02 PM
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Just passed California smog following Renntech HHT tune on my G500 (m113 5.0) =)
Only other mods were K&N air filters, deleting middle muffler, and upgrading to Magnaflow mufflers after cats. No warning lights after tune. I was scanning this post prior to going in for a smog check, and decided not to flash it back to stock prior to the check, so wanted to follow up.
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Old Apr 13, 2021 | 04:14 PM
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for those interested all of my tunes are sold with emissions intact.
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