Torque Converter Lock-Ups

[kv at us.ibm.com]

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
>> ----------------------------------------------------------
>>
>
>