Torque Converter Lock-Ups

[Roger Heflin]

To add to what bruce says, some of the lockup stuff is in the
computer, some of it will not be part of the computer.  I suspect that
the brake switch is not in the compuer, ie it is external hardware
that overrides what the computer is sending, of course I could be
wrong, ther could be a brake swtich bit in there someplace, but I
would have built it in external hardware since it is fairly simple to
build that way.

				Roger

On Wed, 23 Dec 1998, Bruce Plecan wrote:

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