tcc lockup issues
05-24-2006, 12:57 PM
#1
tcc lockup issues
Ive got a cheap TCI streetfighter stalls around 2800.
The problem Im having is the lockup will not stay locked.
At 45 with it locked in 4th whenever I let off the throttle completely it unlocks, then if I mash the throttle again it takes about 2 secs. for it to lock. This is such a pain in the *** it keeps locking and unlocking.
Also it will unlock at low rpm, high load, like going up a hill when its not supposed too.
I thought it was pwm, it does cause some vibration and chatter when locked at low rpms but have tweaked the tables to no adue.
The tcc lockup mph table is stock but the shift tables have been tweaked upward.
The problem Im having is the lockup will not stay locked.
At 45 with it locked in 4th whenever I let off the throttle completely it unlocks, then if I mash the throttle again it takes about 2 secs. for it to lock. This is such a pain in the *** it keeps locking and unlocking.
Also it will unlock at low rpm, high load, like going up a hill when its not supposed too.
I thought it was pwm, it does cause some vibration and chatter when locked at low rpms but have tweaked the tables to no adue.
The tcc lockup mph table is stock but the shift tables have been tweaked upward.
05-24-2006, 04:47 PM
#4
Originally Posted by dewmanshu
have ya hit up jimmyblue on hptuner's forum? He knows that trans tuning inside and out!
05-24-2006, 06:40 PM
#5
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Hopefully it doesn't turn out like this guys TCI TC. http://hptuners.com/forum/showthread.php?t=5398
05-24-2006, 07:50 PM
#7
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i don't think it's any tuning issues. it's the damn converter. my first one the lockup clutch went out at 5k mi. on it. now when i was home in louisiana on leave, the same thing happened with the same amount of mileage on this one. luckily it started working again before i left.
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05-24-2006, 10:51 PM
#8
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With stock tuninmg everytime you release the throttle, the TCC will unlock. Every truck does this.
A stock TC take less than 2 seconds to lock back up however. It might be a problem the clutch is actually slipping or the oil not evacuating quickly enough to allow the TCC to engage.
if you take your foot off the gas the TCC will unlock, you said you mash on the throttle. With most tuning mashing the throttle would delay a TCC engagement until a certain mph was met. Above 85 mph most TCCs are locked at WOT, under that they will not lock at WOT, unless told to by adjusting the tuning.
peace
Hog
A stock TC take less than 2 seconds to lock back up however. It might be a problem the clutch is actually slipping or the oil not evacuating quickly enough to allow the TCC to engage.
if you take your foot off the gas the TCC will unlock, you said you mash on the throttle. With most tuning mashing the throttle would delay a TCC engagement until a certain mph was met. Above 85 mph most TCCs are locked at WOT, under that they will not lock at WOT, unless told to by adjusting the tuning.
peace
Hog
05-25-2006, 12:14 AM
#9
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Originally Posted by hog
With stock tuninmg everytime you release the throttle, the TCC will unlock. Every truck does this.
A stock TC take less than 2 seconds to lock back up however. It might be a problem the clutch is actually slipping or the oil not evacuating quickly enough to allow the TCC to engage.
if you take your foot off the gas the TCC will unlock, you said you mash on the throttle. With most tuning mashing the throttle would delay a TCC engagement until a certain mph was met. Above 85 mph most TCCs are locked at WOT, under that they will not lock at WOT, unless told to by adjusting the tuning.
peace
Hog
A stock TC take less than 2 seconds to lock back up however. It might be a problem the clutch is actually slipping or the oil not evacuating quickly enough to allow the TCC to engage.
if you take your foot off the gas the TCC will unlock, you said you mash on the throttle. With most tuning mashing the throttle would delay a TCC engagement until a certain mph was met. Above 85 mph most TCCs are locked at WOT, under that they will not lock at WOT, unless told to by adjusting the tuning.
peace
Hog
The newer trucks will stay locked with 0% TPS.
If you can lock it and it locks it's not in the trans, its the tune. Could you post up a screen shot of your tcc apply/release tables? I bet it is in there.
And setting the min duty cycle to 98% should make a huge differents. You could also add more pressure with the forcing motor table but thats a bit harder to work out. I bet your problem is in the tcc apply/release tables.
05-25-2006, 01:21 AM
#10
Originally Posted by Wilde Racing
The newer trucks will stay locked with 0% TPS.
If you can lock it and it locks it's not in the trans, its the tune. Could you post up a screen shot of your tcc apply/release tables? I bet it is in there.
And setting the min duty cycle to 98% should make a huge differents. You could also add more pressure with the forcing motor table but thats a bit harder to work out. I bet your problem is in the tcc apply/release tables.
If you can lock it and it locks it's not in the trans, its the tune. Could you post up a screen shot of your tcc apply/release tables? I bet it is in there.
And setting the min duty cycle to 98% should make a huge differents. You could also add more pressure with the forcing motor table but thats a bit harder to work out. I bet your problem is in the tcc apply/release tables.
the tcc apply is stock