Just ran across this, it’s really cool! Is this something that an amateur can do if they understand the transmission strategy? Do u offer a base setup for sale?
Are you distributing the TCM sketch? If so, where do you have it up? I've got my 4L80e wired up for manual shift, and while writing arduino sketches aren't a problem, I've no idea of where to even start setting up shift points such that RPM & TPS are both taken into consideration, not to mention pressure control. If I had a TCM, I could feed it input and see how it behaves to get a ball park, but, I don't have one. ;)
I was distributing the sketch and I haven't gotten back to this project in 4 years. I've been using my original system using PIC chips. I may pick this up again next year since I am making changes in the car. Pressure control is a waste of effort. Leave it be, soften your shift based upon RPM. Regarding shift points, that is entirely up to you. Max shifting RPM is really based upon the engine you are mating to the transmission.
@@black70buick54 Does TC lockup need modulated signal, or is it just send to ground like A & B solenoids? Hrm, no pressure control? Shifting to 2nd (and 1st on downshift) is rather harsh at full line pressure, and that's in a Suburban. I get what you're saying, as I have noticed I can mitigate by being hypervigilant on when I shift to second (or downshift into 1st)...which if I had a programmable TCM, I could obviously setup accordingly. In any case, if it wasn't for the harsh 2nd shift, I'd probably never be sufficiently motivated to install a TCM...though paddle shift might have gotten me there (steering column shifting is annoying, to be sure). Many thanks for the insights!
@@dota9925 The TCC and The PCM are originally modulated. The PWM in Arduino is not the right frequency so much more code will be required and/or working out the duty cycle to compensate. 1-2 shift hasn't been an issue for me, maybe because of vehicle weight and or motor torque. TCC was modulated to mitigate heat build up in the TCC coil, but that simply adds heat to the fluid. Again not a problem for me. All my information came directly from the lead Hydromatic engineer . So pwm of these solenoids is upto you.
@@black70buick54 Thank you! Very helpful. I remember there are two frequencies -- pre 94 = 292.5Hz, and 94+ = 614Hz. Looking at arduino spec, looks like 490.196Hz/976.56Hz is default (depending on board and pins), but this can be adjusted with one line of code to between 30-65000Hz. So, doable, but would still need some clue as to how to drive the damn thing (no problem sending 614Hz...but now what?). If modulation is just a matter of heat management, maybe just wire up constant voltage, with temp sensor, and keep an eye on it...?
@@dota9925 if you saw my other videos about this (though incomplete with the arduino) you can use FETs. I am sure you can use a solid state audio driver or motor driver board as well. The trans solenoids are not high power but they are high enough to require amplification from the Audio signaling. You can measure the solenoid draw yourself to double check the specs of what you want to drive them with. Regarding heat, I believe you are over thinking it. just my opinion.
@@black70buick54 ok lol i was a half asleep and must have reed / thought wrongly fer some resin must been thinking it may need a different type or source of signal apologizes
@@overbuiltautomotive1299 to be clear you are not too far off. The Arduinos have pwm signaling. I don't think more power is needed to drive the pressure control through a FET. But a 555 timer could be powered up and turned off between shifts to slightly simplify code.
@@black70buick54 cool not bad i guess for a guy that ant ever fooled with that type of digital stuff much lol ;that were mind wuz at is adjustable on the fly possible higher current solution ...i don`t know God bless
