You are correct: engaged (I hate it when I do that!)
Auto shift control...opinions please!!!!
Thread Starter
Pro
Joined: Jun 2007
Posts: 626
Likes: 2
From: Coquitlam British Columbia
Auto shift control...opinions please!!!!
Noticed that Corvette Central has a plug in unit that stops the up-down shifts in city traffic...p/n 534293. It sounds like a TC delay lockup. Is this worth while and has anyone used this?
Opinions please.....this sounds too good to be true!!!
Opinions please.....this sounds too good to be true!!!
Melting Slicks
Joined: May 2007
Posts: 2,382
Likes: 2
From: Kathleen FL
I wired a switch to turn off automatic lock up for the same reasons you may want to. Yeah all that unlocking and locking again gets really annoying. So when I turn the switch off, it will not lock up at all. When it flip it back on, it will lock up right back to the original settings in the chip.
Burning Brakes
Joined: Nov 2003
Posts: 914
Likes: 1
From: Redding Ca
I had a bypass switch installed too. But I did it because the car kept shifting into lockup just before the finish line at the drags. The rest of the time I like the way the thing works normally. Occasionaly I forget and leave lockup disengaged at a stop light. It is like starting off in high gear in a stick car
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by GeosFun
Occasionaly I forget and leave lockup disengaged at a stop light. It is like starting off in high gear in a stick car
As I understand it, the hydraulics in the trans prevent the converter from locking in first gear, regardless of the ECM or a manual switch command. Some people, with a manual TCC engage switch, will switch the converter to "lock" while staging, then the TCC will lock up when the trans shifts to second.
RACE ON!!!
Burning Brakes
Joined: Dec 2006
Posts: 936
Likes: 2
From: Tyrone PA
Disengaged??? You mean engaged, right? Disengaged would be normal. If the TCC were engaged at a stop, your engine should have stalled. Just like with a stick shift car if you forgot to push in the clutch pedal when you came to a stop unless your TCC slips like crazy.
As I understand it, the hydraulics in the trans prevent the converter from locking in first gear, regardless of the ECM or a manual switch command. Some people, with a manual TCC engage switch, will switch the converter to "lock" while staging, then the TCC will lock up when the trans shifts to second.
RACE ON!!!
As I understand it, the hydraulics in the trans prevent the converter from locking in first gear, regardless of the ECM or a manual switch command. Some people, with a manual TCC engage switch, will switch the converter to "lock" while staging, then the TCC will lock up when the trans shifts to second.
RACE ON!!!
Race Director
Joined: Jun 2004
Posts: 13,953
Likes: 706
From: WI
If I am cruising in town and the torque converter locks and unlocks alot, would shifting it from OD position to D position change anything, or would it continue to lock and unlock, only in 3rd instead of 4th? ('89 by the way). Also, I'm having a 3200 stall lockup converter installed right now. Will it act the same as the stock converter as far as locking and unlocking?
Thread Starter
Pro
Joined: Jun 2007
Posts: 626
Likes: 2
From: Coquitlam British Columbia
Thanks for the replies so far but I really need to know if this in line plug that plugs into the line underneath will stop the "lock-unlock" senerio and is it worth the $29.95.....note..no way to manually adjust one way or the other from what I can read into the description..does it really do what it says?
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Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Originally Posted by dan0617
If I am cruising in town and the torque converter locks and unlocks alot, would shifting it from OD position to D position change anything, or would it continue to lock and unlock, only in 3rd instead of 4th? ('89 by the way).
RACE ON!!!
Burning Brakes
Joined: Dec 2006
Posts: 936
Likes: 2
From: Tyrone PA
I wouldn't expect the shifter position to make any difference as long as the trans is in the same gear. Try it, let us know. The ECM, which commands the lock up, doesn't know the shifter position. There is 4th gear switch, inside of the trans, that tells the ECM when the trans shifts into 4th, but until then I wouldn't expect the shifter position to make a difference. Also, a different converter can't change the lock up points, but it could change the feel.
RACE ON!!!
RACE ON!!!
It doesn't matter 3rd or 4th gear, it locks at around 40mph. The only difference is, with the higher stall converter, it isn't stalling or "slipping" as much in 3rd as it is in 4th. Less "spongy" feel when it unlocks, then I push the gas down a little when I'm in 3rd compared to 4th. More of a high stall converter thing than any help to the original poster.UNCLEBILL, in my opinion, if you have a low stall converter and do alot of in town driving it will benefit you to be able to disable converter lockup, but you will want it enabled for highway driving. I don't know if the switch you are looking at will let you enable/disable when you want or if it just disables. I was considering a switch but now with a high stall converter disabling the lockup will be bad. It feels spongy all the time till the converter locks with the 3200 stall.
Is there any way to make the converter quit unlocking every time I tap the brake pedal??? I don't mind it locking and unlocking at a set mph, I acutally like it now. But I hate that if I tap the brake pedal for a curve in the road it unlocks, then when I hit the gas it revs to 2300 or so, then quickly locks back up.
Thread Starter
Pro
Joined: Jun 2007
Posts: 626
Likes: 2
From: Coquitlam British Columbia
Got the car back last night and tried it...and again you are right. It doesn't matter 3rd or 4th gear, it locks at around 40mph. The only difference is, with the higher stall converter, it isn't stalling or "slipping" as much in 3rd as it is in 4th. Less "spongy" feel when it unlocks, then I push the gas down a little when I'm in 3rd compared to 4th. More of a high stall converter thing than any help to the original poster.
UNCLEBILL, in my opinion, if you have a low stall converter and do alot of in town driving it will benefit you to be able to disable converter lockup, but you will want it enabled for highway driving. I don't know if the switch you are looking at will let you enable/disable when you want or if it just disables. I was considering a switch but now with a high stall converter disabling the lockup will be bad. It feels spongy all the time till the converter locks with the 3200 stall.
Is there any way to make the converter quit unlocking every time I tap the brake pedal??? I don't mind it locking and unlocking at a set mph, I acutally like it now. But I hate that if I tap the brake pedal for a curve in the road it unlocks, then when I hit the gas it revs to 2300 or so, then quickly locks back up.
It doesn't matter 3rd or 4th gear, it locks at around 40mph. The only difference is, with the higher stall converter, it isn't stalling or "slipping" as much in 3rd as it is in 4th. Less "spongy" feel when it unlocks, then I push the gas down a little when I'm in 3rd compared to 4th. More of a high stall converter thing than any help to the original poster.UNCLEBILL, in my opinion, if you have a low stall converter and do alot of in town driving it will benefit you to be able to disable converter lockup, but you will want it enabled for highway driving. I don't know if the switch you are looking at will let you enable/disable when you want or if it just disables. I was considering a switch but now with a high stall converter disabling the lockup will be bad. It feels spongy all the time till the converter locks with the 3200 stall.
Is there any way to make the converter quit unlocking every time I tap the brake pedal??? I don't mind it locking and unlocking at a set mph, I acutally like it now. But I hate that if I tap the brake pedal for a curve in the road it unlocks, then when I hit the gas it revs to 2300 or so, then quickly locks back up.
Oh well; back to doing more research!!!!
Racer
Joined: Dec 2006
Posts: 325
Likes: 2
From: Chattanooga TN
I wouldn't expect the shifter position to make any difference as long as the trans is in the same gear. Try it, let us know. The ECM, which commands the lock up, doesn't know the shifter position. There is 4th gear switch, inside of the trans, that tells the ECM when the trans shifts into 4th, but until then I wouldn't expect the shifter position to make a difference. Also, a different converter can't change the lock up points, but it could change the feel.
RACE ON!!!
RACE ON!!!
shifting to 3rd, or "D", will disable the TCC at all speeds and conditions.
not sure which, if any other model years had this additional switch...
Last edited by BigLee; Nov 5, 2007 at 08:09 PM.
