Torque Converter Lock-Ups

Tue Dec 29 17:39:24 GMT 1998

I have a carburetor 305 in a 83 chev and the TCC locks up using a 
combination of the brake switch and vacumn switch connected to the EGR 
port. When the vacumn rises above the cut in point the switch closes. I 
believe that GM would consider MAP & TPS in deciding the lockup point.

/Marc

----------
From: 	Bruce Plecan[SMTP:nacelp at bright.net]
Sent: 	December 23, 1998 11:50 AM
To: 	diy_efi at efi332.eng.ohio-state.edu
Subject: 	Re: Torque Converter Lock-Ups

-----Original Message-----
From: kv at us.ibm.com <kv at us.ibm.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Subject: Re: Torque Converter Lock-Ups

There are no iron clad strategies, for TCC.  What some one says is usually
about their experience.  In the gm calibrations, there is sometimes a
mandatory lock up speed, reguardless of TPS, but (and off hand I can't 
think
of an exception) there
is usually a TPS disable in the gm calibrations, at less than that speed.
  Most all if not every gm uses a brake switch as a fail safe so that the
TCC
won't engage, at a stop, and launch a car into an intersection.  The are
other reasons, but the lawsuits of a TCC failure, and not having a brake
switch cut out would scare even gm, IMHO
Bruce
>
>SO is the TCC lockup/unlock based only on MPH and the brake switch?  No
info on load is used??
>
>________________________________________________
>  Kevin Vannorsdel     IBM Arm Electronics Development
>    408-256-6492                Tie 276-6492     kv at us.ibm.com
>
>
>
>"Bellsouth" <n5xmt at bellsouth.net> on 12/23/98 09:16:30 AM
>
>Please respond to diy_efi at efi332.eng.ohio-state.edu
>
>To:   diy_efi at efi332.eng.ohio-state.edu
>cc:    (bcc: Kevin Vannorsdel/San Jose/IBM)
>Subject:  Re: Torque Converter Lock-Ups
>
>
>
>
>
>Roger,
>There is a solenoid in the trans that controls lockup, and a valve in the
>valve body that inhibits it until 2nd gear.
>Grounding pin F of your ALDL connector will hold the TCC locked in 2nd, 
3rd
>and OD. (Unless you step on the brakes...)
>Not sure exactly where it is in your chip, but there should be an apply 
MPH
>for 2nd, 3rd and OD (usually different for each gear) and a disengage MPH
>also.  The early 700R4 and 4L60's had the engage/disengage too close
>together so the TCC would cycle on/off quickly and burn up the trans.
>
>Later,
>Dave
>
>-----Original Message-----
>From: Roger Heflin <rah at horizon.hit.net>
>To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
>Date: Friday, November 13, 1998 11:22 AM
>Subject: Re: Torque Converter Lock-Ups
>
>
>>
>>
>>Well,
>>
>>I have a 93 Z28.  I know there is a way for the computer to request
>>lockup.  The lockup characteristics seem to be:
>>
>>low throttle: 50mph+ in high gear.
>>wot: 95+mph in 3rd gear (about 4300 rpm)
>>
>>My car at least (with a big cam) has difficulties with the low
>>throttle lockup.   I am currently disassembling the prom, and
>>hopefully can find where it controls things.  It looks like I need to
>>raise the low throttle part to about 60-65.
>>
>>Also there is a electronic control to lockup things and it can be
>>manaully controlled with some aftermakert parts.  I was thinking that
>>In cases where the car computer cannnot control things someone could
>>rig a circuit to detect some various car parameters and decide when to
>>force a lockup.
>>
>>Note that my car has a 4L60 tranny (basically a 700R4) and this is the
>>non-electronic tranny, the 94 f-bodies was when they started using
>>4l60E's, so all of my tranny is under mechanical control except for
>>the torque convertor.
>>
>>
>>
>> Roger
>>
>> On Thu, 12 Nov 1998 martin at mgass.demon.co.uk
>>wrote:
>>
>>> I would like to raise the subject Auto Transmission Torque Converter
>(TC)
>>> Lock-Ups and Electronic Control..
>>>
>>> Does anybody know if there are any TCs with Lock-Up operating under
>>> electronic control in tune with the auto-box.
>>>
>>> Most TCs seem to me to Lock-Up purely mechanically determined by
>>> speed and load.  (are these the only parameters and are they the
>>> correct ones ?).
>>>
>>> Are mechanical based Lock-Ups adjustable in any way...or must the
>>> whole TC be replaced ?   Similarly if there are any under elctronic
>>> control are they alterable....what electronic control device is used ?
>>>
>>> I believe that TC lock-Up is a relatively recent thing and was
>>> not present in the Borg-Warner Type 35 & 65 implementations of the
>>> late 60s and 70s.  I first remember it being mentioned in Europe in
>>> some small Ford Autos of the early 1980s...but has now found its way
>>> into most Auto setups.
>>>
>>> Martin
>>>
>>> ----------------------------------------------------------
>>> martin at mgass.demon.co.uk
>>> ----------------------------------------------------------
>>>
>>
>>
>
>
>
>
>

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