Firm up shifts

[Confused1]

Have a 3500 stall and would like to firm up the shifts. I've read that the values in the "Base shift pressure" table need to be raised.
Could someone explain what exactly needs to changed and what other tables would needs changes?

[XTrooper]

Try this (copy and paste it in). This table is from a C5 with a 3800 stall converter. I'm using it also (I have a Yank 3000 with 3.73 gears) and it's working great for me. Note that the higher the value, the lower the line pressure and vice versa. This gives you stock-like shifts at part-throttle and nice, firm ones at WOT. The numbers above the top of your table represent your throttle position so you'll see that as the throttle position % goes up, the line pressure also increases (lower value). If it's too firm for you just advantage the upper throttle position percentage columns to a higher value.

Good luck!

1069 874 874 874 835 796 776 664 610 576 483 371 332 278 200 68 68 0
1069 913 894 874 835 796 776 645 610 576 483 371 332 278 200 68 68 0
1069 913 894 874 835 796 776 664 630 576 483 371 332 293 200 68 68 0
1069 913 894 874 835 796 776 664 610 576 483 371 332 278 200 68 68 0
1069 913 894 874 835 796 757 645 610 576 469 361 322 278 200 68 68 0
1069 933 894 874 835 796 757 645 610 562 469 361 322 264 200 68 68 0
1069 933 894 854 835 796 757 645 610 562 469 361 322 264 200 68 68 0
1069 933 894 854 835 796 757 645 610 562 469 361 303 264 200 68 68 0
1069 933 894 854 835 796 757 645 610 562 469 361 303 264 200 68 68 0
1069 933 894 854 815 796 757 645 610 562 469 361 303 264 200 68 68 0
1069 933 894 854 815 796 757 645 591 562 454 361 303 264 200 68 68 0
1069 913 894 854 815 776 757 645 591 562 454 361 303 264 200 68 68 0
1069 913 894 854 815 776 757 645 591 562 454 342 303 264 200 68 68 0
1069 913 894 854 815 776 737 630 591 562 454 342 303 254 200 68 68 0
1069 913 874 854 815 776 737 630 591 562 454 342 303 254 200 68 68 0
1069 913 874 854 815 776 737 630 591 562 454 342 303 254 200 68 68 0
1069 913 874 854 815 776 737 630 591 562 454 342 303 254 200 68 68 0

[Confused1]

By copying these values and pasting them into the "Force motor current vs pressure vs temp" will firm up the shifts. Will there be any need to change the values in the "Base shift pressure" tables. I was under the impression that this was the tables to use.
Thanks for the help XTrooper

[XTrooper]

Sorry, I guess I just wasn't thinking when I read the title of your thread. I automatically assumed you'd already edited your base pressure settings.

Try this table for your base shift pressure settings.

0 15 20 20 20 25 25 29 32 35 39 42 50 52 55 58 63 67 70 74 79 83 86 90 93 96 96 96 96 96 96 96 96
0 24 29 30 32 37 41 45 48 53 56 60 62 65 69 74 77 81 85 88 91 95 96 96 96 96 96 96 96 96 96 96 96
0 24 29 32 35 41 44 47 50 53 56 61 65 67 70 74 77 81 85 88 91 95 96 96 96 96 96 96 96 96 96 96 96

If after you've done this, you still feel you want your shifts to be firmer, then try changing your Force Motor Current table.

If you find the above settings a little too aggressive, try this one. It's a bit above stock at WOT, but basically stock at lower speeds. It's also the table I'm currently using along with the Force Motor Current table previously posted.

0 0 0 0 0 0 0 3 6 9 12 15 18 21 24 28 31 34 37 40 43 46 49 52 55 58 62 65 68 95 95 95 95
0 0 0 0 0 0 2 5 8 11 13 16 19 22 25 27 30 33 36 39 41 44 47 50 52 55 58 61 64 95 95 95 95
0 0 0 3 5 8 11 13 16 19 21 24 27 29 32 35 37 40 43 45 48 51 53 56 59 61 64 67 69 95 95 95 95

[XTrooper]

On the A4 Shift Properties page there is also a box for Max. Line Pressure which you can adjust. If I remember correctly, the stock setting is 90. I currently have mine set at 95%.

[Confused1]

I will give this a try. Thanks again

Sorry, I guess I just wasn't thinking when I read the title of your thread. I automatically assumed you'd already edited your base pressure settings.

Try this table for your base shift pressure settings.

0 15 20 20 20 25 25 29 32 35 39 42 50 52 55 58 63 67 70 74 79 83 86 90 93 96 96 96 96 96 96 96 96
0 24 29 30 32 37 41 45 48 53 56 60 62 65 69 74 77 81 85 88 91 95 96 96 96 96 96 96 96 96 96 96 96
0 24 29 32 35 41 44 47 50 53 56 61 65 67 70 74 77 81 85 88 91 95 96 96 96 96 96 96 96 96 96 96 96

If after you've done this, you still feel you want your shifts to be firmer, then try changing your Force Motor Current table.

If you find the above settings a little too aggressive, try this one. It's a bit above stock at WOT, but basically stock at lower speeds. It's also the table I'm currently using along with the Force Motor Current table previously posted.

0 0 0 0 0 0 0 3 6 9 12 15 18 21 24 28 31 34 37 40 43 46 49 52 55 58 62 65 68 95 95 95 95
0 0 0 0 0 0 2 5 8 11 13 16 19 22 25 27 30 33 36 39 41 44 47 50 52 55 58 61 64 95 95 95 95
0 0 0 3 5 8 11 13 16 19 21 24 27 29 32 35 37 40 43 45 48 51 53 56 59 61 64 67 69 95 95 95 95

[XTrooper]

Ok. Good luck and keep us posted!

[marc_w]

What are 'safe' numbers to run in the base shift pressure tables? Anything under max line pressure - up to as much as you can tollerate?

Pump failures come from increasing max line pressure, correct?

[SportSide_5.3]

I also have a question.

I increased base shift pressure for my 1-2 shift. Now I have a slight bark of the tires.

Is anyone REALLY barking the tires from increased line pressure? I'm just wondering how far I can bump up LP. Higher values equal more bark correct?

Kyle

[XTrooper]

I also have a question.

I increased base shift pressure for my 1-2 shift. Now I have a slight bark of the tires.

Is anyone REALLY barking the tires from increased line pressure? I'm just wondering how far I can bump up LP. Higher values equal more bark correct?

Kyle

I was barking my tire really badly at my 1-2 Shift and chirping them at the 2-3 Shift by increasing my Max Line Pressure to 100% and setting my Shift Time to 0.00. I've since lowered those values to a more conservative 95% and 0.10 respectively. I don't think it was really helping anything and I doubt it was good for the tranny.

[SportSide_5.3]

I went ahead and copied JimmyBlue's tranny spread sheet. everything.

Went and tried it and I like it. Got more umph @ low speed shifts. My shift time table was @ .6 across most the table, so I replaced those with .2 Much better.

Thanks for your time spent on that Jimmy

I think alot of the settings for the trucks are more layed back for "Truck" use. I just notice tons of differences inbetween F-body vs Truck tables. I could be way off though. Definetly, starting to feel more sporty. Just need a stall in there now.

Thanks,

Kyle

[CHRISPY]

XTrooper how is your trans holding up with the numbers you have above in the base and force motor current table?

How many miles and how many 1/4 mile passes.

Did you alter TM at all?

[XTrooper]

XTrooper how is your trans holding up with the numbers you have above in the base and force motor current table?

How many miles and how many 1/4 mile passes.

Did you alter TM at all?

It's holding up just fine with 37,000+ total miles and countless 1/4 mile passes. I'm making just shy of 400 rwhp and 370 rwtq. The rear has 3.73 gears with hardened output shaft, but my tranny is bone stock.

TM is unchanged from stock.

P.S.- I've also swapped out the Yank 3000 for a Super Yank 3500. I did that near the end of last season.

[CHRISPY]

Great thanks for the info!

Did you adjust the max Retard or did you leave it at -10?

Any adjustment to Engine Torque management? If so what did you do?

I am tuning on Thursday night and want to have the trans live into next season



Chris

[XTrooper]

Max retard unchanged. As far as what's been changed on the engine side, I'm afraid I don't really know as Rapid Motorsports did all the engine tuning. Sorry I can't help on that score.

[JasonB]

I've had better than stock results changing the upshift pressure modifier.
Testing was done using a trans test gauge and reading the actual trans line pressure. Doing it this way increases the pressure only during shifts so you're not running with jacked up line pressure when you might not need it. I'd also reduce max retard, mine is at zero.
If you get on it just right and hit -10 the car will fall flat on it's face.
I never get any KR since doing this.

[CHRISPY]

XTrooper,

Would this combination be too aggressive with Max pressure at 95%

0 15 20 20 20 25 25 29 32 35 39 42 50 52 55 58 63 67 70 74 79 83 86 90 93 96 96 96 96 96 96 96 96
0 24 29 30 32 37 41 45 48 53 56 60 62 65 69 74 77 81 85 88 91 95 96 96 96 96 96 96 96 96 96 96 96
0 24 29 32 35 41 44 47 50 53 56 61 65 67 70 74 77 81 85 88 91 95 96 96 96 96 96 96 96 96 96 96 96


1069 874 874 874 835 796 776 664 610 576 483 371 332 278 200 68 68 0
1069 913 894 874 835 796 776 645 610 576 483 371 332 278 200 68 68 0
1069 913 894 874 835 796 776 664 630 576 483 371 332 293 200 68 68 0
1069 913 894 874 835 796 776 664 610 576 483 371 332 278 200 68 68 0
1069 913 894 874 835 796 757 645 610 576 469 361 322 278 200 68 68 0
1069 933 894 874 835 796 757 645 610 562 469 361 322 264 200 68 68 0
1069 933 894 854 835 796 757 645 610 562 469 361 322 264 200 68 68 0
1069 933 894 854 835 796 757 645 610 562 469 361 303 264 200 68 68 0
1069 933 894 854 835 796 757 645 610 562 469 361 303 264 200 68 68 0
1069 933 894 854 815 796 757 645 610 562 469 361 303 264 200 68 68 0
1069 933 894 854 815 796 757 645 591 562 454 361 303 264 200 68 68 0
1069 913 894 854 815 776 757 645 591 562 454 361 303 264 200 68 68 0
1069 913 894 854 815 776 757 645 591 562 454 342 303 264 200 68 68 0
1069 913 894 854 815 776 737 630 591 562 454 342 303 254 200 68 68 0
1069 913 874 854 815 776 737 630 591 562 454 342 303 254 200 68 68 0
1069 913 874 854 815 776 737 630 591 562 454 342 303 254 200 68 68 0
1069 913 874 854 815 776 737 630 591 562 454 342 303 254 200 68 68 0

[XTrooper]

No, I wouldn't say it's too aggressive, but the low speed shifts were a little too harsh for my tastes. Just try it and see what you think.

[jimmyblue]

I'd be interested in knowing more about what you did
to the tables, & what you observed w/ the gauge. I've
never understood just what the pressure modifiers do,
differently than the base shift pressure table.

I currently favor using the Max KR (Retard) table to limit
the TM's authority, though I suppose you could also
do this via the Spark Retard vs % Torque Reduction
table. If your trans TM table commands 37% torque
reduction then the PCM wants to pull out 32 degrees
(a bit bogus you might think). Modifying that table
with lesser retard values might be cleaner than just
capping it off like Max Retard does. I have that at 20
now in the upper RPM and the torque management
is unnoticeable. Finding the proper trade between
protection and performance is another of those
"someday" things.

I've had better than stock results changing the upshift pressure modifier.
Testing was done using a trans test gauge and reading the actual trans line pressure. Doing it this way increases the pressure only during shifts so you're not running with jacked up line pressure when you might not need it. I'd also reduce max retard, mine is at zero.
If you get on it just right and hit -10 the car will fall flat on it's face.
I never get any KR since doing this.

[CHRISPY]

Reprogrammed today

Here is what I did:

1) I put back in trans upshift TM (Stock values and then multiplied by 50%)

2) Left Engine TM off

3) Went back to stock force motor current table

4) Went back to stock base pressure table but then added 10% across the board

5) Shortened the part throttle shift adaptation times.

6) Turned off locked altogether in third and moved up fourth gear lockup/unlock by 10mph across the board

Feels WAY better and the trans should live a bit longer now with trans TM back in place.