Torque Converter Lock-Ups

[Bruce Plecan]

-----Original Message-----
From: Roger Heflin <rah at horizon.hit.net>
Subject: Re: Torque Converter Lock-Ups

My point was that in KV's Blazer, which had a 747 is different from what
your 93
calibration is.  Then on the TBI 82-92 Camaros was different from the TPI,
and
the Caprice different yet.  On the 700R4 some used a 3rd gear switch some
used
a 3+4th gear switch some used a overheat switch, so there are variants.
  Most commonly on the gms the TCC power feed is from the fuse box to a
brake
switch on the brake pedal arm to the TCC solenoid, then switches in the
valve body, and then to the ecm.
Bruce

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