You got it pretty much, theres a big difference between fast shifts and hard shifts. You can have it slam the gear so hard it feels like it will rip it out of the mount, but that doesnt mean that its doing it "quick". And its hard to perceive clutch engagement just by the seat of your pants, there is alot that you can review in datalogs in HPT for transmission that tell you just how fast your car is shifting. But you have to look at those tables in relation to the shift pressure tables as they will scale accordingly. Now I don't have a performance shift mode on my GP GXP because of its year, but this is what my stock shift time table looks like.Originally Posted by BrandonHall10
HPT's wording of the tables can sometimes be misleading but you can see that my stock tables are scaled for more allowed shift time at lower torque levels, but it is also directly proportional to shift pressure as well. And there in lies the error that is typically made. People will take that table and lower it across the board. Sure you might be able to achieve .175 on your tune if the trans pressure setting is for 96psi, but at 36ft lbs of input torque, the trans pressure might be somewhere like 15-20psi, and thus it will never be able to achieve the value you set for it, so the trans thinks something is wrong, and thus you get that BANG on the shift because it is an internal limp mode as it was explained to me. The trans does what it can to prevent damage because of that un-achievable value. And remember there are alot of aspects about the TCM that we arent allowed to edit or have no access to from GM, and that is just another part of it. The tables have to work in layers with each other for them to work right, so you have to be really delicate about how you mod them.
None the less youve done a fantastic job with the hard parts of the trans, so I wouldnt be quick to jump into software changes without experiencing what the hardware changes have done for you yet. THe sonnax line pressure booster kit and the valve body upgrades along with the shift kit are going to make a world of difference as they are mechanically modifying the trans within the bounds of the known stock software values. See how it is, go from there, id be happy to send you my tune file, just PM me your email, but I gotta warn you in advance, my settings will probably be drastically different, I wasnt as aggressive with building my trans as you were so my software values will likely be more heavily modified to reflect that fact.
