6L80 Tune (2-> 1 downshift questions)

[aknovaman]

Lower the settings to 7 mph and it will be fine.

[67Steven]

Originally Posted by aknovaman

Lower the settings to 7 mph and it will be fine.

I will give it a try, thanks.

I would like to know the 'why' behind the 'do' part if you or anyone could briefly explain- I like to learn this stuff for future use!

[BR3W CITY]

Originally Posted by 67Steven

I will give it a try, thanks.

I would like to know the 'why' behind the 'do' part if you or anyone could briefly explain- I like to learn this stuff for future use!

Afaik, its because there isn't the same capacity for overrun that the 4speeds had, due to the design of the internals. The 6l80e's are clutch-to-clutch, and setting too high of a downshift speed would cause more slip between clutches then allowed, and it would probably want to try and shift right back up.

Thats how I understand it from the reading. 6l80e's confuse the crap out of my because the Truck,car,and 'vette's were all setup and programmed a little differently.

[67Steven]

Originally Posted by BR3W CITY

Afaik, its because there isn't the same capacity for overrun that the 4speeds had, due to the design of the internals. The 6l80e's are clutch-to-clutch, and setting too high of a downshift speed would cause more slip between clutches then allowed, and it would probably want to try and shift right back up.

Thats how I understand it from the reading. 6l80e's confuse the crap out of my because the Truck,car,and 'vette's were all setup and programmed a little differently.

Thanks for the information. I thought it might have something to do with wanting to up-shift or the the TCM saves itself from destruction by not allowing the downshift at too high of speed.

It makes me wonder what else is wrong in the tune...

[Hart_Rod]

Originally Posted by 67Steven

Thanks for the information. I thought it might have something to do with wanting to up-shift or the the TCM saves itself from destruction by not allowing the downshift at too high of speed.

It makes me wonder what else is wrong in the tune...

Steven,

email me a copy of your tune and I will take a look at it, r.

R

Edit: just noticed you posted the tune above.