So as I said before, Im an easy driver. It takes me on average 10 to 15 seconds to get up to 45mph. I just dont get in a hurry and dont see any reason to. My truck, a 2019 nissan frontier sv 4x4, has a 4.0 L V6. I believe about 268 HP. Plenty of power for what Im looking for. But because of the way the transmission shifts, my engine has to work harder than It needs to to perform the job I ask of it. For example, going down my driveway, (about 100 yds). In order to get into 2nd gear I have to reach 11 mph. That engine is more than capable of pushing that truck down the driveway at 7 mph in second gear with no problem. But my transmission forces me to push it to 11 or 12 to get it in second gear. If I want to go 10 mph down my driveway I have to have my engine at 1600 rpm, on the verge of shifting, or push it to into second gear and then let off the gas a little. If I could bring my shift points down so that at minimal tps (Throttle percentage sensor? Or something) it would shift into second at 8 mph instead of 11. The truck would not unnecessarily rev so high in first gear. This also carries over into second to third shift. Easing down a flat or even slightly declined roadway, I have to go 20 mph to shift to third, that is 2000 rpm in second gear. When third is more than capable of pushing my truck at 15 mph. I dont see why, when trying to accelerate slowly, I should have to push my truck beyond a reasonable point to have it shift and continue.
The other thing is the TCC, the torque converter lock-up. When getting up to speed rather quickly (for me) it isnt noticed, but when 3 or 4 seconds is spent in third gear, the TCC locks up. Which is no problem except for that when it shifts into fourth it unlocks and will not lock back ever. The problem with this is that when climbing a hill in third gear I losse power upon the shift into fourth because the TCC unlocks. This causes forth gear to run at a higher rpm that third, (I shift into fourth at 1500 rpm and after the shift Im running 1600) which if you understand, the higher the rpm the more gas required to turn the engine. So I start to decelerate in fourth gear up the hill. So I give it more gas running it up to 1700 rpm until it shifts into fifth at 30 mph, where it also immediately locks the TCC, bringing me down to 1100 rpm where I can (not kidding) then let off the gas and keep accelerating up the hill. So I would like to set the TCC to lock in fourth gear to remove this “Dead zone”. in my transmission. I hope this helped you understand what I mean.