Cali 2013 smog testing to account for final drive ratio, tire sizing, curb weight?
09-08-11, 01:40 AM
#1
Cali 2013 smog testing to account for final drive ratio, tire sizing, curb weight?
Many of you may have heard about the upcoming 2013 smog test changes for Cali. It mostly affects 2001+ cars differently. '00 and below (OBD1+2) still do the dyno test. The usual caveats with modification still apply.
According to this thread, however:
http://m.i-club.com/forums/showthread.php?t=231504
... in which some smog techs go into details about how the new rules and procedures will change things on their end, there may be some new things to worry about if your car has to see a dyno:
Vehicle weight, tire size and gearing.
That is according to them. So in theory even if you have a totally stock 2JZ-GE or 1UZ-FE without even an aftermarket intake, you may barely pass or not pass purely because your car's rpm isn't where the factory gear ratio is supposed to have it at 15mph on the roller. Or those 275's in the rear are too different from the factory 215's. Or just lightening up your SC 100-200lbs suddenly throws off the test.
I'll believe it when I see it but if this is actually true It is just pure cruelty.
Does anyone know more lowdown about the ARB adding vehicle weight, gear ratio and tire size to the new testing procedures?
I resigned my dream of swapping a 1JZ a while ago but this is ridiculous. They can't take my handling modifications away from me too.
According to this thread, however:
http://m.i-club.com/forums/showthread.php?t=231504
... in which some smog techs go into details about how the new rules and procedures will change things on their end, there may be some new things to worry about if your car has to see a dyno:
Vehicle weight, tire size and gearing.
That is according to them. So in theory even if you have a totally stock 2JZ-GE or 1UZ-FE without even an aftermarket intake, you may barely pass or not pass purely because your car's rpm isn't where the factory gear ratio is supposed to have it at 15mph on the roller. Or those 275's in the rear are too different from the factory 215's. Or just lightening up your SC 100-200lbs suddenly throws off the test.
I'll believe it when I see it but if this is actually true It is just pure cruelty.
Does anyone know more lowdown about the ARB adding vehicle weight, gear ratio and tire size to the new testing procedures?
I resigned my dream of swapping a 1JZ a while ago but this is ridiculous. They can't take my handling modifications away from me too.
09-08-11, 11:33 AM
#6
Well, from what I gathered these are factors that the smog techs must deal with when trying to get an accurate test result. I'd really like to hear from others in the testing industry.
I'll be keeping my stock diff and looking for stock rear wheels that's for sure but I don't know how I'm supposed to run 215's or 225's with TT brakes up front. I consider those a safety necessity. It'll be fun in a couple of years.
I'll be keeping my stock diff and looking for stock rear wheels that's for sure but I don't know how I'm supposed to run 215's or 225's with TT brakes up front. I consider those a safety necessity. It'll be fun in a couple of years.
09-08-11, 11:38 AM
#7
Lexus Champion
think about the true difference of wheel + tire sizes from stock to say 18's or 19's and hwo they affect RPMs at low levels 15 & 25mphs. It's far less of an impact at those levels than if they tested at highway speeds. With my 19's at 25 mph on my spedo I'm pretty accurate, however at 75 it's a different story.
Now compare someone with a big truck with a much larger disparity between stock and aftermarket: I.E. Off road, or a Navigator w/ 26's....I think they have more to worry about than we do.
Now compare someone with a big truck with a much larger disparity between stock and aftermarket: I.E. Off road, or a Navigator w/ 26's....I think they have more to worry about than we do.
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09-08-11, 12:14 PM
#10
Lexus Champion
Plus what if an auto 2j person swaps out their rear diff that's going to throw off the RPMs too. There are so many factors to take into consideration it could be a nightmare. Oh the joys of Commiefornia
09-08-11, 08:09 PM
#11
I'm not auto but I will be doing just that pretty soon. Basically giving myself the 93-96 NA Supra 5-spd final drive to get the revs higher in all gears. Pretty meager change to be hassled about compared to a swap or NA-T setup.
Last edited by KahnBB6; 09-08-11 at 09:28 PM.
09-08-11, 09:28 PM
#13
Found some more info. For far newer OBD2 cars, this link explains what MY2005+ owners are going to have to deal with although it could apply to 2000-2005 if the state wanted it to:
http://www.camaro5.com/forums/showthread.php?t=122635
It doesn't apply to SC owners since our cars are too old but it is good to know. Basically for MY2005+ cars the state is confident that just being able to tell if the ECU has been reflashed is enough to do away with the old dyno test. Any changes made to the ECU on a newer car is going to be detected... unless people figure out how to trick the hardware.
After reading this I think I know what I'm in for with a much newer car but it still doesn't clear up how testing for OBD1 cars will change in '13.
http://www.camaro5.com/forums/showthread.php?t=122635
It doesn't apply to SC owners since our cars are too old but it is good to know. Basically for MY2005+ cars the state is confident that just being able to tell if the ECU has been reflashed is enough to do away with the old dyno test. Any changes made to the ECU on a newer car is going to be detected... unless people figure out how to trick the hardware.
After reading this I think I know what I'm in for with a much newer car but it still doesn't clear up how testing for OBD1 cars will change in '13.
09-09-11, 07:26 AM
#14
Lexus Champion
Yeah I have theories that will possibly work for 2000+ cars who want to do motor swaps 
Again you need to have someone who will forgoe the visual inspection and you theoretically should be good to go
Again you need to have someone who will forgoe the visual inspection and you theoretically should be good to go
yay... more fun stuff...