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Originally Posted by htvfd460
Since I can't edit.... Make sure it's a CARB approved product. Since tour in CA your emissions laws are stringent! Get a Cortex tuner and program for economy (Superchips calibrates to CARB and CA emission standards so you'll be safe. Shoot for a lower shift point and monitor your egt and boost pressure.)
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Yeah, CA just started smogging diesels last year. I'm lucky because mine didn't have a CAT converter new, so I don't need one. I have a superchips flashpaq now and I run it on the highest setting. It seems like it get's the best mileage that way.
As far as additives I've had the best luck with two-stoke oil. One ounce per gallon, has to be a certain type though.
About the compression of diesels.. I think the cummins is 25:1. It doesn't even have glow plugs, it fires on just the force of the compression.
I've started it up on 25 degree mornings with no wait, it starts right up.