Does your stalled auto unlock when coasting?
Thread Starter
10 Second Club
iTrader: (27)
Joined: Sep 2008
Posts: 2,229
Likes: 0
From: Lake Tapps, WA
Does your stalled auto unlock when coasting? Does your stalled auto unlock when you left off the throttle? When you roll back into the throttle does it take a couple hundred rpm rise in rpm before the lock up clutch fully engages and brings the rpm back down?
Thread Starter
10 Second Club
iTrader: (27)
Joined: Sep 2008
Posts: 2,229
Likes: 0
From: Lake Tapps, WA
depends who you ask, it's a built trans and circle D convertor, when you do a search on tech and HPtuners there's quite a few people who say when your tps goes to 0% open it unlocks the convertor, my 98 suburban does it.
Thread Starter
10 Second Club
iTrader: (27)
Joined: Sep 2008
Posts: 2,229
Likes: 0
From: Lake Tapps, WA
So just as your about all the way off the throttle you feel it unlock? When you just roll into the throttle you feel it lock? Does the rpm climb a little first before the lock up clutch catches it?
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
10 Second Club
iTrader: (27)
Joined: Sep 2008
Posts: 2,229
Likes: 0
From: Lake Tapps, WA
Yea pretty much right on then when it locks up it goes back down. It feels like a 5th gear it down shifts when I get out of it then RPMs climb maybe 200 then when it locks it is like an OD gear. I think that is the best way to describe it.
My car was tuned a short time after the stall and that really helped too.
My car was tuned a short time after the stall and that really helped too.
You don't want the TC to release instantly the tps goes to 0 %; otherwise you would have a very annoying problem with TC cycling between unlock and lock. That's why it depends on the TCC release mph and TCC lockup mph.
Thread Starter
10 Second Club
iTrader: (27)
Joined: Sep 2008
Posts: 2,229
Likes: 0
From: Lake Tapps, WA
Your right it's annoying, but I'm still above the TCC release mph when it does this by at least 10mph.
You can change the parameters for lock and unlock when coming into and releasing throttle. Factory generally the will unlock on tilt out and relock on tilt in but of course unlock if you tilt in hard.
The factory tuning is set up basically for it to only be locked at a steady throttle cruising not on decel or acceleration.
Now as to How you set those parameters you will need to talk to a tuner about that.
But pretty much with no ajustments in tuning that is normal and will of course be alot more noticable the higher the stall speed and of course the higher the rpm the more the rpm jump and drop will be depending of of course speed and rpm at the time.
The factory tuning is set up basically for it to only be locked at a steady throttle cruising not on decel or acceleration.
Now as to How you set those parameters you will need to talk to a tuner about that.
But pretty much with no ajustments in tuning that is normal and will of course be alot more noticable the higher the stall speed and of course the higher the rpm the more the rpm jump and drop will be depending of of course speed and rpm at the time.
__________________
Launching!
Joined: Sep 2008
Posts: 234
Likes: 0
From: Ashland,VA
The vehicles with the PWM TCC solenoid will unlock smoothly while off the gas and lock smoothly when you get back on it. GM did them like that to improve smoothness durring the transition unlike the older non PWM solenoids that were on and off only with no in between.PWM systems use duty cycle in % to control the TCC solenoid. Most of the older ones stay locked on decel until you hit the brake or speed drops. Theres nothing wrong with your car.
Thread Starter
10 Second Club
iTrader: (27)
Joined: Sep 2008
Posts: 2,229
Likes: 0
From: Lake Tapps, WA
OK figured it out with the help of Frost, the tcc uses input from a brake pedal switch, if the pcm doesn't see a constant 12v it will unlock the convertor at 0% tps. I had a connector pin pushed back at the switch.
On my car it's pin 33 ppl wire, it should see 12v with key on.
On my car it's pin 33 ppl wire, it should see 12v with key on.