TCC switch & questions.....

[Bruce Plecan]

-----Original Message-----
From: Barry Tisdale <btisdale at cybersol.com>
To: DIY_EFI at efi332.eng.ohio-state.edu <DIY_EFI at efi332.eng.ohio-state.edu>
Date: Saturday, January 16, 1999 9:15 AM
Subject: TCC switch & questions.....

Is the TCC your using designed for WOT use?...
There are lots of considerations, ie, tranny life, converter life,
reliability,
firing impulses, and power transfer.
  A $3 switch is cheap, but the tranny overhaul it may cost, by using it
expensive if the converter ain't designed for that use.
  I think GH's mention about switching it off during a gear change has
merit in high weight drivetrains like yours (4WD)..
  Remember some comments here are about specific cars, and not
universal laws.
    FIRST TRUE LAW OF TUNING, Assume nothing, and doument
everything.  Ya wanna play with shift points, first get a G-Tech, and
Diacom+, to find out if your going in the right direction.  ie raising shift
the shift point if your already out of fuel would not make sense.
  Seat of the pants tuning, is for the, wannabe's
   SECOND TRUE LAW RULE OF TUNING, speed costs money,
how fast can you afford to go?.
Using some common sense reduces this cost.
Cheers
Bruce
Cheers
Bruce


>Recent discussion on TCC lockups got me thinking (always a dangerous
thing....).
>
>Having installed the TCC lock switch, I've got a couple of questions for
the performance gurus:
>
>What advantage or disadvantage, during daily driving, to having the switch
on or off?  Things just feel more 'solid' to me w/ the TCC lock on.
>
>It makes sense to me that having the converter locked during Banzii runs
will net a lower ET due to less loss thru the driveline - KB claims .2-.25
sec better.
>
>BUT -
>
>Shifts now occur @ about 500 rpm *less* engine speed (no slippage now).
W/O the TCC locked, my Syclone would shift @ (WOT) about 4300 rpm - just
about at the HP peak - this is not ideal.  Ideally, we'd like to upshift on
the 'far' side of the HP curve, to an approximately equal HP point on the
rising side of the curve.  As it stands w/ the TCC locked, shifts occur @
*less* than the HP peak of the engine.  This seems to be in need of
correcting - seems you'd like to raise the shift points to about 5000 RPM,
past the HP peak, to keep the engine on the power curve better.
>
>Would raising the shift points, at least to compensate for the now
'slipless' TC, be of benefit?  Seems there should be an additional .2 sec or
so there also (?).
>
>Right?  Wrong?  All wet??  Comments?
>
>Thanks - Barry
>