[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.

[laynlo15]

Originally Posted by radz28

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.

It was on the dyno as an NA on E70, made 435/441 and ran 11.64@120.