Torque Converter Lock-Ups

[Roger Heflin]

In 3rd gear, it locks up a WOT (full load at 95mph.)  I will get back
to you what the exact conditions are.  I am completing the flowchart
of the routine that does this to more fully understand what it is
doing.   I know under my tests it locks up at 95 under WOT, so I would
also assume it would be locked up under any lessor load.  I have not
noticed it locking up in 2nd gear, and in 4th gear it appears to be
locked above 50 (at light loads).  I don't really know about wot in
4th as I have to be doing about 130-140 to get there.  95 in 3rd
locks up before the end of the 1/4 so is pretty easy to test.  But
after I have the routine flowcharted I will add it to my web page.

				Roger

On Wed, 23 Dec 1998 kv at us.ibm.com wrote:

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