722.9 TCU Build Theater
722.9 TCU Build Theater
03-11-2018, 07:03 AM
#13
(03-11-2018, 06:10 AM)baldur(03-10-2018, 05:31 PM)whipplem104 Yes and no. certain shifts are clutch to clutch. 3-4 being the main one. You are correct about the valve body. It handles most of the overlap control issues that you have in normal C-C trans. I think that the big thing is that you could technically run a 722.6 with 3 pushbutton switches to shift it. Doing it right is much more complicated but you can shift it that way. It is really hard to burn one up though and that is a big difference.
Ok, interesting. I wasn't aware that the 722.6 had shifts that were done by a single clutch. The valve body's built in logic kind of hides what's really going on when a shift happens. I just knew about the 3-4 flaring, which is a behaviour that is only possible on a clutch to clutch transmission, and I wondered why it only tends to happens in 3-4.
A real clutch to clutch transmission is next to impossible to control without a controller that tunes itself, and they're very sensitive to changes in fluid viscosity and clutch pack wear, basically anything that changes how quickly the clutch will bite or release when the solenoid controlling it opens or closes, hence the controller has to monitor each shift and continually alter its transfer functions.
I did a 5HP110 trans on a PCM controller several years ago and it was a gigantic pain in the ass to tune. We got it working reasonably well in the end (solid shifts, not violent but not factory smooth), and we didn't burn up the transmission but it has needed small tweaks to the tune occasionally since.
Baldur
Actually it is clutch to clutch on 3-4 shift. Every shift is done by one solenoid and solenoid is switched only during shift. Solenoid itself is not applying oil pressure directly to clutch, it applies pressure to valve in valve body and valve releases or applies pressure to more than one clutch at the time. Some useful pages:
https://www.youtube.com/watch?v=zQwN2-9mLME
http://www.all-trans.by/assets/site/file...22.6.1.pdf
(03-11-2018, 06:10 AM)baldur(03-10-2018, 05:31 PM)whipplem104 Yes and no. certain shifts are clutch to clutch. 3-4 being the main one. You are correct about the valve body. It handles most of the overlap control issues that you have in normal C-C trans. I think that the big thing is that you could technically run a 722.6 with 3 pushbutton switches to shift it. Doing it right is much more complicated but you can shift it that way. It is really hard to burn one up though and that is a big difference.
Ok, interesting. I wasn't aware that the 722.6 had shifts that were done by a single clutch. The valve body's built in logic kind of hides what's really going on when a shift happens. I just knew about the 3-4 flaring, which is a behaviour that is only possible on a clutch to clutch transmission, and I wondered why it only tends to happens in 3-4.
A real clutch to clutch transmission is next to impossible to control without a controller that tunes itself, and they're very sensitive to changes in fluid viscosity and clutch pack wear, basically anything that changes how quickly the clutch will bite or release when the solenoid controlling it opens or closes, hence the controller has to monitor each shift and continually alter its transfer functions.
I did a 5HP110 trans on a PCM controller several years ago and it was a gigantic pain in the ass to tune. We got it working reasonably well in the end (solid shifts, not violent but not factory smooth), and we didn't burn up the transmission but it has needed small tweaks to the tune occasionally since.
Baldur
Actually it is clutch to clutch on 3-4 shift. Every shift is done by one solenoid and solenoid is switched only during shift. Solenoid itself is not applying oil pressure directly to clutch, it applies pressure to valve in valve body and valve releases or applies pressure to more than one clutch at the time. Some useful pages:
https://www.youtube.com/watch?v=zQwN2-9mLME
http://www.all-trans.by/assets/site/file...22.6.1.pdf
Messages In This Thread
722.9 TCU Build Theater - by deviance - 03-09-2018, 07:42 AM
RE: 722.9 TCU Build Theater - by turbo_kemi - 03-09-2018, 07:49 AM
RE: 722.9 TCU Build Theater - by baldur - 03-09-2018, 09:49 AM
RE: 722.9 TCU Build Theater - by deviance - 03-09-2018, 10:14 AM
RE: 722.9 TCU Build Theater - by baldur - 03-10-2018, 06:14 AM
RE: 722.9 TCU Build Theater - by deviance - 03-10-2018, 09:52 AM
RE: 722.9 TCU Build Theater - by whipplem104 - 03-10-2018, 12:30 PM
RE: 722.9 TCU Build Theater - by baldur - 03-10-2018, 03:24 PM
RE: 722.9 TCU Build Theater - by baldur - 03-10-2018, 03:53 PM
RE: 722.9 TCU Build Theater - by whipplem104 - 03-10-2018, 05:31 PM
RE: 722.9 TCU Build Theater - by baldur - 03-11-2018, 06:10 AM
RE: 722.9 TCU Build Theater - by erx - 03-11-2018, 07:03 AM
RE: 722.9 TCU Build Theater - by deviance - 03-11-2018, 03:10 AM
RE: 722.9 TCU Build Theater - by whipplem104 - 03-11-2018, 10:36 AM
RE: 722.9 TCU Build Theater - by baldur - 03-11-2018, 11:57 AM
RE: 722.9 TCU Build Theater - by deviance - 03-11-2018, 11:37 AM
Users browsing this thread:
1 Guest(s)
1 Guest(s)
Users browsing this thread:
1 Guest(s)
1 Guest(s)