Should anyone modify the PWM or ECCC strategy to function as an ON/OFF apply while using a converter with a damper plate designed for PWM or ECCC, a tail end bump on the apply of the clutch would be felt, possibly resulting in a customer complaint. Only under high torque or high vehicle speeds will the PCM command the converter clutch to be fully locked. Otherwise, it always slips. A first design or second design clutch lining will not survive in the third design strategy. The woven carbon fiber or equivalent must be used in all EC^sup 3^ applications
From GM...It looks like the clutch material in the aftermarket verter is the culprit like you stated. Why don't they just build a converter with the necessary clutch material? Wonder if there is a way to trick the TCM in how much estimated torque is being delivered. I notice from my logs I don't achieve zero slip until in 4th.
Last edited by Waker; 03-17-2010 at 12:52 AM.
Really surprised no one has developed a part for the valve body that eliminates PWM like they did for the 4L60.
there are places that make a single disk that can be sliped like that and from what i am told work fine down the highway but you cant lock them up at wot. they wont hold the power.
with control over the right tables we would be fine with this converter.
for what it is worth control over the lock up tables isn't our only problem. i can force my converter to lock using the scan tool. it locks solid. when i go wot it ends up slipping at the top of 3rd and probably the top of 4th too. the actual line pressure ends up being under 80psi and from what i can tell there are no tables to bump that up either. this is with ~600rwtq so it wouldn't be an issue for everyone.
2017 camaro ss a8 with low mount twins
Good to talk with someone who is further along than myself. Appreciate the info
I just purchased HPT so within the next few days I'll be trying my luck with this thing. I had the tranny tuned already and have ran really good times with TM off. However my goal is to have it just as fast with TM.
i have hear people say leave it off till you are into the 450+hp/tq range. above that you have to run it to get it to shift. i dont know what all of yoru mods are but i would leave it off if you can.
does your car shift good at part throttle without kicking you on every shift? you can fine tune that part with the adder/modifier table. before i just tried on or off for tm and it made th part throttle shifts too harsh with it off and fall on it's face with it on. that table lets you get it in the middle.
2017 camaro ss a8 with low mount twins
Definitely too harsh at part throttle. Thats the main reason I bought HPT, and to get more control of the TCC lol. My WOT shifts are nice as long as I'm running 275psi. The only lull in the shift is when the TCC is re-locking after shift completion. I have a Vararam, ARH/Cats, 2.5/3" exhaust, Flowmaster Super 40's, DR's and of course a tune. Car ran a 12.4 @ 113 2K DA and shitty traction a few weeks ago. Corrected was a 12.1 @ 115. 4.10's are going in next weeks some time and I guess I have to wait on a verter till someone gets it figured out.
Can you turn TM off and still mess with the adders/multipliers? I have been reading all the help sections to prepare me for tuning, that is where I got the TCC rpm adjustment theory. Maybe it is a trouble shooting value only. If HP could add/manipulate that boy would it make allot of people happy.
i didn't know any of this a few weeks ago. you leave all of the master enablers on. leave all of the tm factors at the stock setting of 1. then do all of your adjusments in the adder/modifier table. the axis are rpm and tq. a value of 0 keeps full tm and a value of -1 is no tm. you can vary between 0 and -1.
for starters it sounds like you need to turn upshift tm back on. then adjust that table so you see 0 or close to 0 in the part throttle shift areas and -1 or close to -1 in the wot parts of the table. you can adjust from there. you might want to kill some of the tm at part throttle so start at 0 but then try -.2 and see if you like that better, then try -.4, you will find a part throttle shift that you like.
2017 camaro ss a8 with low mount twins
i see you mention 275psi. i am logging actual line pressure with a pressure sensor permanantly mounted to the tranny and loged with hptuners. i can say 100% for sure that adjusting the pressure values and tables has no effect on the main line pressure. i have gone from stock to double with all of those values and saw no effect at all. right now my values are stock and i am hitting it with 600hp/tq.
i can report seeing some odd pressures. 300-350psi at very light throttle 1st and 2nd gear. that seems very high. then as low as 80psi at wot/high rpms and that seems too low to me.
2017 camaro ss a8 with low mount twins
i can say top of 3rd and 4th see less than 100psi. i will post up a pic of my last 1/4 mile run.
i will also post up a pix of my addermodifier table and latest tune. i have mine set up diferent than what i just sugested you try. i need tm at wot to get thru the shifts and with a lose converter i want very little tm down low.
2017 camaro ss a8 with low mount twins
i am guessing whoever did your tune was making other changes at the same time and that is what you were feeling.
2017 camaro ss a8 with low mount twins