[KingLT1]

Another critical function will be having control of line pressure for the 6-7 shift for the A10. That is what has caused a lot of failures on the A10 making big power.

[laynlo15]

Originally Posted by KingLT1

Another critical function will be having control of line pressure for the 6-7 shift for the A10. That is what has caused a lot of failures on the A10 making big power.

I know on my A8s it seemed like the stock was about 110 psi of line pressure. Looked at some old tunes and I think we moved the line pressure to 340 or so.

[laynlo15]

Just got it back, plugged in and now charging the battery since its been disconnected for a week and a half. Getting ready to plug in and read the files.

[radz28]

Originally Posted by KingLT1

Another critical function will be having control of line pressure for the 6-7 shift for the A10. That is what has caused a lot of failures on the A10 making big power.

I've got mine cranked a good bit higher, but I know I'll never see that 170-MPH. lol... That - and I'm not making big power.

Originally Posted by laynlo15

I know on my A8s it seemed like the stock was about 110 psi of line pressure. Looked at some old tunes and I think we moved the line pressure to 340 or so.

I think I'm seeing a limit, in the SCANNER, of about 160-psi. I know I'm commanding more, but I don't really get slip from the TC or the TRANNY, so I'm thinking that might be enough.

[laynlo15]

I just finished up putting mine back together. Read the files even though I didn't need to read the T93 file, it actually popped right up and I was good to go. I did have to download a new version of Beta and download another program so I could use the new version of Beta. Sync everything and fired it up. Once we make changes to the TCM tune then I'll have to use my credit to flash it. Really had no issues but it's raining now so I'll try and drive it later or tomorrow when I have some dry time.

[laynlo15]

Just looking through some of the tables and man there is a lot of shit going on for sure. Stuff I don't have a clue about.

[radz28]

There isn't a WHOLE lot you HAVE to tune. Your ECM-side is dialed-in, so it's more TORQUE limits you might want to adjust. I mean - in terms of going fast. A lot of the rest, because you're mostly stock, probably don't need to be changed, IF you like the stock tuning. Personally - I like the stock tuning, mostly, so I only try to add a little more UPSHIFT feel, and the rest of my strategy (right or wrong) is based off keeping clutches locked when they need to be, and keeping the THROTTLE open and SPARK at commanded. It's nice to have a lot to fart around with though.

[KingLT1]

Originally Posted by radz28

I've got mine cranked a good bit higher, but I know I'll never see that 170-MPH. lol... That - and I'm not making big power.



I think I'm seeing a limit, in the SCANNER, of about 160-psi. I know I'm commanding more, but I don't really get slip from the TC or the TRANNY, so I'm thinking that might be enough.

I made a typo...it's the 5-6 shift. I command 299psi through gear 1-5 since that is all I have access too. I don't have the latest update since I currently don't have a MPVi3. I refuse to upgrade my MPVI 1 because HPtuners is taking away features in the newer versions. I probably will buy a MPVI 3 outright at some point.

The A8's required adjusting a ton of parameters to get them on point. Shift time, inertia, pressure, and tm.

[laynlo15]

I have Mpvi2, not planning on updating mine to a 3 anytime soon. So, 299 psi from 174 is stock.

[laynlo15]

I did get out and drive the car to make sure it shifts fine and everything appears to be ok. Looking to make just a few changes in the shift pressure and raising the torque limits.

[radz28]

Like King' has said - there is a fair amount of improvement that can be made just on the ECM-side, and if the MINIMUM SPARK has been changed in the right places enough, that single change can do a lot for feel and shift speed. Getting rid of TORQUE restrictions, though, is key, though, it seems can be detrimental if reduced too much.

[JP374]

Originally Posted by KingLT1

I made a typo...it's the 5-6 shift. I command 299psi through gear 1-5 since that is all I have access too. I don't have the latest update since I currently don't have a MPVi3. I refuse to upgrade my MPVI 1 because HPtuners is taking away features in the newer versions. I probably will buy a MPVI 3 outright at some point.

The A8's required adjusting a ton of parameters to get them on point. Shift time, inertia, pressure, and tm.

Yup, mine had troubles with 5-6 shift. My pressure is now set at 359psi, inertia, shit timing has all been tuned. I’ve had no issues since then with the shifts.

[laynlo15]

Originally Posted by JP374

Yup, mine had troubles with 5-6 shift. My pressure is now set at 359psi, inertia, shit timing has all been tuned. I’ve had no issues since then with the shifts.

I've never had any issues with my shifts. Now I'm not at your HP either. Mines on time every time with firm shifts.

[radz28]

Originally Posted by laynlo15

I've never had any issues with my shifts. Now I'm not at your HP either. Mines on time every time with firm shifts.

Having VVE and VTT tuned correctly definitely helps in this area. Dyno load-tuning (I don't remember if I ever noticed you stating if your car was on the dyno, prior to adding the PI) is probably the most helpful because you can get into areas of VVE, in a good steady state "mode", and really dial in what the car really wants. Then, you can get good TORQUE calculations that you can apply in a manor, in the VTT, that allow both models to work together to give good information to the TCM to allow it to apply what it needs to for gear-holding pressure and shift pressures. It sounds like a lot of the SHIFT INERTIA and SHIFT TIMING-type definitions aren't as necessary (under the circumstances I just stated for VVE/VTT) except to really fine-tune the shift feel for the driver. At least from my research and courses I've watched. I tend to agree with that, too. My little Sonic is pretty much stock, except for the tune, and I've been able to make it, more or less, as aggressive as I want. Some of those changes apply to this car, too, and I know for sure, even changing VTT from stock under deceleration, can make things less than comfortable if you go the wrong way. HELL - even VTT between gasoline and E85 makes a difference. I'm closer to "optimal" on my E85 side than my gasoline side (at least in terms of the kind of feel I'm trying to achieve).

Personally - I like that I can make TOURING/SNOW a little softer than SPORT/TRACK, because I like feeling the shifts. I don't want old school tire-barking shifts under low load, but I want close to that at WOT. I really only wanted a little more shift aggression than stock, and it's nice to have a lot of the ability to do that. It's fun tuning on the TCM.