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2-1 downshift bump after basic tune

 

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SparKnocK
2-1 downshift bump after basic tune

Hey ya'll,

I've recently tuned two different stock 1500 sierras (12' and 13') and have the same issue with both when coming to a stop. When the trucks shift down from 2nd to 1st (0% throttle) they kind of bump/drag into gear. Is this primarliy from increasing base upshift pressures? I have not messed with base downshift pressures yet. From what i read on here, i can aid this with reducing minimum spark but not sure how much lower to go than stock settings. Also is this primarily adjusted in the minimum spark base and TM tables? Or will adjusting the Idle spark advanced coastdown table help as well? Attatched is one of the trucks files.

 

Thank you!

 

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