Lockup converters. tuning q for 730 ecm

[Tom Sharpe]

I have a "special" non-lockup converter from TCI. The specs are 10" race,
furnace brazed, yadayayda, and forget stall speed and torque multiplication and
give me max lockup when rpm > 4000. They said OK and sent me one. It's not for
sale.  Everything else is. TomS

Programmer wrote:

> Yes, when coupling phase occurs and the stator unlocks, rotary flow is high
> and vortex flow is low, you're at maximum torque transfer and multiplication
> is gone. You may as well be locked at that point, I guess...
>
> Lyndon.
>
> >A vast majority of the multiplication is ocurring below the stall speed of
> >the converter, once you'r 500 rpm over stall speed, all your taking about
> is
> >slippage (in a practical sense).
> >Bruce
>
> Message-----
> >> From: Bruce Plecan <nacelp at bright.net>
> >> To: gmecm at diy-efi.org <gmecm at diy-efi.org>
> >> Date: October 17, 2000 7:03 PM
> >> Subject: Re: tuning q for 730 ecm
> >>
> >>
> >> >
> >> >I think tis easier then that.
> >> >Autos give you addition torque multiplication (via converter), but the
> >down
> >> >side is slippage (slippage is a waste of heat energey).
> >> >Not wasting this heat energy gives ya some HP.
> >> >Depending on converter, this slippage can be 7-15%.
> >> >Down side, is all that more inertia to change speeds SUDDENLY during a
> >gear
> >> >change.
> >> >Bruce
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >> Heres what I think the reason is it works for some and not others:
> >> >>
> >> >> TCC lock at the track works to better the ET if your setup makes more
> >> >> average power at RPM's BELOW your normal auto shift point with TC
> >> unlocked
> >> >> (or if your setup makes more average power below where you MANUALLY
> >shift
> >> >> your auto trans and you didn't realize it.). If you can lock the TC at
> >> >your
> >> >> peak power it serves to extend or flatten the power curve as it holds
> >> peak
> >> >> RPM for a longer period. Think of it as a switch that changes your
> >3.73's
> >> >> into 3.42's (well, to illustrate anyway). Use the 373's for takeoff
> and
> >> >> switch to 342's to keep your 1/4 mi RPM's from extending too far above
> >> >> average peak power.
> >> >>
> >> >> If yer gonna lock it, Dont lock it at too low a RPM if you make more
> >> power
> >> >> in the upper range.... you're just delaying the good R's arrival.
> >> >>
> >> >> Locking it is cheating.. whereas N2O, for example is "natures" mod
> LOL
> >> >;-)
> >> >>
> >> >> My $0.015 Now back to your regularly scheduled EFI content.
> >> >>
> >> >> ----- Original Message -----
> >> >> From: <ECMnut at aol.com>
> >> >> To: <gmecm at diy-efi.org>
> >> >> Sent: Tuesday, October 17, 2000 4:54 PM
> >> >> Subject: Re: tuning q for 730 ecm
> >> >>
> >> >>
> >> >> > Sorry for the earlier blank reply..  The TC lockup works for my
> >> syclone.
> >> >> > good for about a tenth in a 12 second truck with stock trans &
> >> >convertor.
> >> >> > I have a drawing for which adld pins to short.
> >> >> >   http://www.enzoco.com/mike/syclone/lockup.htm
> >> >> > Crappy sketch, but someone from the F-Body list must have liked it,
> >as
> >> >> > he scarfed it and put it on his own page.  Very simple.. You just
> >short
> >> >> the
> >> >> > outside top row pins on the aldl connector together..  The TCC locks
> >in
> >> >> > any gear but first.  It unlock if youtrip a brake pedal switch, or
> >> >return
> >> >> to
> >> >> > firsr gear.  If you like boost, this tends to shorten TC clutch
> life.
> >> >> > Cheers,
> >> >> > MV
> >> >> >
> >> >> > >  I think that its hit or miss whether you lock the TC or not for
> >> track
> >> >> use.
> >> >> > >
> >> >> > >   A LOT of GN guys lock the TC.  This is why Precision Industries
> >> >> created
> >> >> > >  TC's with multi-clutch designs.  There's a group of people who
> >will
> >> >> swear
> >> >> > >  that they gain 0.1 and 1mph for locking up the TC in all gears
> >above
> >> >> > first.
> >> >> > >   So - when the car hits second the TC locks.  Some people have
> >tried
> >> >> this
> >> >> > >  'trick' and not seen anything.  There's even a couple magazine
> >> >articles
> >> >> > >  which show car gaining a tenth by manually locking the coverter
> >> above
> >> >> > first
> >> >> > >  gear.  I personally have never tried it.  However, I might try it
> >> >this
> >> >> > > weekend
> >> >> > >  for shits and giggles to see if it works.
> >> >> > >
> >> >>
> >>
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