slowprocess

iTrader: (9)

Got a question about the performance mode in the pcm. Is there a way I can use this mode for, say street races that start from a slow roll. For instance, can I tune it in performance mode to hold 1st gear out longer at low speeds instead of shifting out so quick? I've already got my shift points a little more aggresive in it, but don't know how, if even possible, to hold out first longer using it.

Also, is there a way to make the downshifts faster using the tune or is this just the nature of the 80? At a slow 15 to 20mph roll, it really seems to be slow downshifting down to go.

oakley6575

iTrader: (5)

Yes it can be done. Do you have a tow/haul switch in your truck already or are you going to run a new switch?

BTW, my 80e is kind of slow to downshift as well. The converter always flashes to its stall speed before it downshifts. So I would be interested to see if there is a fix

03sierraslt

iTrader: (22)

Absolutely you can, you can change all the shift points and pressures. As for the slow downshift you speak of, I really don't notice it on mine but at the same time mine is not stock at all so I don't know if that plays a role.

slowprocess

iTrader: (9)

Yeah I have the tow/haul in mine, so I figure why not use it. My 2500 gets all of the work duty, so might as well get something out of that switch. Yeah, mine flashes as well then downshifts. Sort of puts me behind right from the start on slow rollers.

I guess my next question would be.....how to I start to go about setting it up to hold first gear longer at a slow roll? And we're not going to count your 80e setup since its you're running a Rolls Royce of 80es and I'm rolling a pinto of 80es.

03sierraslt

iTrader: (22)

Go into the performance tabs and start raising your MPH at lower throttle settings. Post up your tune and I'll tweek it and post up the screen shot later this eve.

slowprocess

iTrader: (9)

Man I really appreciate it! Here's my tune as it sits right now.

nonnieselman

iTrader: (10)

Yea thats how mine is setup..
Each gear will hold out till 6000rpms at part throttle. and it will downshift into the lowest gear possible. its nice for playin on the highway cause it takes forever to downshift and then go.

slowprocess

iTrader: (9)

So in performance mode, will I be upping the part throttle speed to my full throttle shift speed across the board? I'm guessing that will keep it from shifting out of the gear at a lower speed while rolling in 1st or 2nd?

What would I need my downshift speeds to be set to in performance mode?

nonnieselman

iTrader: (10)

Ok heres what you want to do..
Get a good log of your 1-2 and 2-3 shifts. MPH and RPM.

Say your 1-2 shift is at 60mph @ 6000Rpms

Your goin to go in your 1-2 part throttle shift table and Set performance mode up to ~55mph across the whole board..
2-1 downshift to 50mph or so. That way if your goin 50mph or under it will go to first gear.

2-3 shift is at 100mph@6000rpms
Set your 2-3mph part throttle to ~98mph.
3-2 downshift to 95mph or so.

Vola.
this coms invery handy if you spin and let out or feather it. Its not goin to up shift and then downshift again. Its goin to shift when it gets to your MPH set point.

slowprocess

iTrader: (9)

Makes sense Nonnie! I'll put those in and give it a try on the way to lunch.