Is it possible to change CARB tune to EPA tune
Thread Starter
Joined: Aug 2012
Posts: 1,539
Likes: 84
From: Mesa, Arizona
Is it possible to change CARB tune to EPA tune Hey gang, I’ve got a coworker in a predicament. Long story short he changed out his cat y pipe on his 2007 Silverado with a walker EPA cat setup not knowing the truck is CARB compliant. He is now getting a 430 Catalyst efficiency code with the brand new cats. Is there a way to change the ecu programming to not look for the stricter “California bullshit”? We live in Arizona and epa compliance is all that’s required but he can’t keep throwing codes.
Thread Starter
Joined: Aug 2012
Posts: 1,539
Likes: 84
From: Mesa, Arizona
He talked with a local shop and they asked if he installed the correct cats. Apparently it happens a lot and the incorrect cats can throw the catalyst efficiency code because they aren't as efficient as the ones removed.
We are wondering if something can be changed in hp tuners to not meet CARB requirements.
Aftermarket cats are never going to behave the same as factory cats, that's what's causing your P0420 code. It has nothing to do with a CARB tune vs an EPA tune, there is no such thing/difference. You can either switch out the aftermarket catted y-pipe for an OEM one or you can just disable codes.
Thread Starter
Joined: Aug 2012
Posts: 1,539
Likes: 84
From: Mesa, Arizona
Aftermarket cats are never going to behave the same as factory cats, that's what's causing your P0420 code. It has nothing to do with a CARB tune vs an EPA tune, there is no such thing/difference. You can either switch out the aftermarket catted y-pipe for an OEM one or you can just disable codes.
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It sounds like you have all the answers, except there is no tune difference and that's what matters and it's why it's throwing codes with aftermarket cats. So we are back to what I originally said to do to fix it.
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Verdad Gallardo Thread Starter
Joined: Aug 2012
Posts: 1,539
Likes: 84
From: Mesa, Arizona
The shop is telling him his truck is CARB compliant and his new cats are not the CARB compliant ones required.
I don't care what the shop is telling him and I don't care what somebody charges for CARB stamped cats, I'm telling you what the problem is and how to fix it. The rest is pure bullshit.
Rick does special project design and manufacturing projects there, he isn't going to tell him any different than what I have. I do the tuning down there and know exactly what the OP is dealing with and I've told him how to fix it.
Which ones? There plenty of "compliant" cats that are still going to trip codes because they don't work the same as OEM cats do. Saying they are carb compliant means they spent the money to get them certified and nothing else.
Thread Starter
Joined: Aug 2012
Posts: 1,539
Likes: 84
From: Mesa, Arizona
He was looking at the Walker and Davico. If they are junk he will have to find an oem.
