tcc duty cycle
- Thread starter dynarex
- Start date
Ive been wondering about that too.
On the 5-speed allison's, the max duy cycle/PWM is 98%
why only 65% on the 6-speeds? Is it because the 6-speed TCC solenoid is pulsed at 1000hz? I think the 5-speed is only pulsed at 100hz or something...
On the 5-speed allison's, the max duy cycle/PWM is 98%
why only 65% on the 6-speeds? Is it because the 6-speed TCC solenoid is pulsed at 1000hz? I think the 5-speed is only pulsed at 100hz or something...
while tuning my tranny I was wondering the same thing...but didn't want to change is since im already pushing way to much power through the stock converter...
so would upping the duty cycle increase the holding capacity?
so would upping the duty cycle increase the holding capacity?
stock max duty cycle is 97%...Im not positive but I might guess if you up it anymore you risk burning out the solenoid.
I know mine is set at 65%, maybe someone such as Mike L.:hail: might know, because I'm not quite ready to pull the tranny.
After some more thought I am thinking that maybe the 65% duty cycle you see is the amount of time the TCC solenoid is seeing ground. This is just a different way of calculating.
In EFILive TCM tuning, there is a TCC solenoid duty cycle table that is referenced between throttle position and trans temp. The 01-05 allisons have 98% max duty cycle, the 06's have 65% max duty cycle. IIRC the 2006+ allisons pulse the TCC solenoid at 1000hz, whereas the 01-05's are pulsed at 100hz. Maybe this is the difference? I wonder what would happen if you set the whole table on an 01-05 allison to 98%? Probably get much harder lockup because the converter wouldnt be pulsed on. Shock load might break things tho. Im not gonna be the first person to try it! 
I bet you might be able to change the table to make ity pulse the converter on FASTER/more aggressively, but I wouldnt completely get rid of the "gradual" apply.
I bet you might be able to change the table to make ity pulse the converter on FASTER/more aggressively, but I wouldnt completely get rid of the "gradual" apply.