Handleheld tuners and the wonderful California smog rules

[#BrownRoush]

Got a question for those that live in California. My car is an 01', so I just have the smog for me is just through the OBD2 port. I plan on upgrading my rear gearing to 3.73's, which will necessitate either a custom tune or a modification of the stock tune. I know a custom tune will fail the car smog wise.

I'll try to explain this the best way possible. If I modify the stock tune, then just re-load the stock back up, will the smog shop be able to read/find out that I modified the stock tune? On my past cars, I have dealt with the whole "friendly" smog shop bs, and I just don't want to deal with it.

 

[lutter94]

Throw a speed cal at it, that just modifies the speed signal, ecm won't know the difference.

Sent from my SM-G930V using Tapatalk

 

[Mustanger]

Why does the gear change require a tune? My OBDI didn't by any means...

 

[lutter94]

Why does the gear change require a tune? My OBDI didn't by any means...

It doesn't "require" a tune. But their ecm can be tuned to modify the speed signal to the gauges, I don't believe ours have that ability. I'm pretty sure if its new enough to have the ecm stored odometer, the ecm can modify the speed signal.

 

[Jakespeeds]

I am in Southern California and have to do the smog every 2 years. I use a BBK catless X pipe & catch in the engine compartment. The engine is a mild build and everything on the motor is BBK from the shorty headers to the MAF, throttle body and so on. I use a SCT for the programming. Full Throttle Kustoms in Fillmore did a full tune. On the handheld I have the stock tune and the aftermarket tune. Come smog time I install the factory mid-pipe, disconnect the catch can and hook up the factory tubes from the cam covers. I load the stock tune and it sails right through smog. Then I run it home and reinstall everything back. So far no issues.

Jake

 

[#BrownRoush]

I am in Southern California and have to do the smog every 2 years. I use a BBK catless X pipe & catch in the engine compartment. The engine is a mild build and everything on the motor is BBK from the shorty headers to the MAF, throttle body and so on. I use a SCT for the programming. Full Throttle Kustoms in Fillmore did a full tune. On the handheld I have the stock tune and the aftermarket tune. Come smog time I install the factory mid-pipe, disconnect the catch can and hook up the factory tubes from the cam covers. I load the stock tune and it sails right through smog. Then I run it home and reinstall everything back. So far no issues.

Jake

awesome, that's what I was hoping to hear