quick lock up question
Thread Starter
10 Second Club
iTrader: (27)
Joined: Sep 2008
Posts: 2,229
Likes: 0
From: Lake Tapps, WA
quick lock up question When traveling down the highway with light pressure on the throttle if you slightly ride the brake at the same time, the rpm jumps 200-400rpm is that the converter unlocking?
So the pcm logic leaves the trans in 4th but unlocks the converter?
So the pcm logic leaves the trans in 4th but unlocks the converter?
yes lightly tapping or holding the brake will unlock the converter that is normal
__________________
Well if PWN is enabled there will be some, However in the lockup release from hitting the brake that would be instant
__________________
Thread Starter
10 Second Club
iTrader: (27)
Joined: Sep 2008
Posts: 2,229
Likes: 0
From: Lake Tapps, WA
Yes hitting the brake is instant, but if I give it a few light blips of the throttle, the rpm will come up but still stay locked up. When I blip the throttle you can feel the drag of the converter being locked but there is slippage.
Thats PWM the partial or controlled apply of the converter (PULSED WIDTH MODULATION)
__________________
Trending Topics
Thread Starter
10 Second Club
iTrader: (27)
Joined: Sep 2008
Posts: 2,229
Likes: 0
From: Lake Tapps, WA
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
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 Well its just a way he converter is applied and yes i prefer its disabled particulary with small converters, Now while we do this mechanically in our units in you case it would be easiest to make it mostly go away in tuning,
This is done by setting the TCC DUTY CYCLE to 90 min and 100 max this will mostly do away with it ,
It will increase converter clutch life.
This is done by setting the TCC DUTY CYCLE to 90 min and 100 max this will mostly do away with it ,
It will increase converter clutch life.
__________________
depends how much throttle you give it. when you're tuning for the lockup, the throttle position (along with speed) is a variable that determines when it unlocks.
the way my lockup is set, i can jab at the throttle and as long as i don't go past approx 25% throttle, it will stay locked.
just as frank is telling you, when you tip in the throttle, pwm allows for slippage. with tcc duty cycle set to 90min and 100max, i have it, but its minimal.
the way my lockup is set, i can jab at the throttle and as long as i don't go past approx 25% throttle, it will stay locked.
just as frank is telling you, when you tip in the throttle, pwm allows for slippage. with tcc duty cycle set to 90min and 100max, i have it, but its minimal.
Thread Starter
10 Second Club
iTrader: (27)
Joined: Sep 2008
Posts: 2,229
Likes: 0
From: Lake Tapps, WA
wow didn't think so much went into a lock up clutch, I always thought it was on or off and that was it. One last question, if the pcm senses slippage outside of a certain parameter will it apply more pressure to the clutch? So if you installed a different converter would the pcm adjust the pressure required to control slippage?
Last edited by mike13; Jan 2, 2009 at 11:32 PM.
No thats why its a very good idea to eliminate PWM with smaller converters as with less area they will slip more and if the slip becomes excessive the PCM will set po1870 set line to max and disable overdrive and lockup .
__________________