Is there a way to manually lock the torque converter? Or do you have to have a reprogrammer? In the old Buick days we used a paper clip to short two terminals in the ALDL connector.

Im going to redyno and dont have access to software/reprogrammer. I see i should expect 25% drivetrain loss if I run unlocked.

thanks

 

Maybe someone can chime in but if you have a service manual you can ground the TCC pinout. I think it is pin 32 or 34. You may be able to do a search for the exact pinout location.

I have always had the same problem dyno'ng.

 

 

You can manually lock the T/C with a switch. Below is info someone posted on the forum, not sure who, about installing a lock up switch. I never tried it so I don't know if it works. If you really want to do this, I would suggest that you contact a tuner with some experience. I know that Doug at ECS did an install for GMF back in Nov. of 2004 and he ran a 10.9 at Atco.


======================================== =============

Lockup switch wiring

Here are the color codes, at the transmission
connector (20-pin round). This is probably a
good place to get ahold of them (if you like
soldering upside-down) as they're right close
to where you'd be putting the switches (but
on the other side of the sheet metal). The
colors "should" be the same at the PCM connectors
but there you have a lot of duplication to weed
through. You probably want a handy PCM pin chart
if you intend to work up there.

Pin Color Function
A LtGrn 1-2 Solenoid
B Yel/Blk 2-3 Solenoid
C Red/Blk Pressure control (PC) solenoid valve, high control
D LtBlu/Wht PC solenoid valve low control
E Pnk IGN
F-K ------ Not used
L Yel/Blk Transmission Fluid Temp sensor
M Gry Low reference 3.8L
M Blk Low Reference 5.7L
N Pnk TFP Switch Signal A
P Red TFP Switch Signal C
R DkBlu TFP Switch Signal B
S Wht 3-3 Shift Solenoid Valve Control
T Tan/Blk Torque Converter Clutch solenoid valve control
U Brn Torque Converter Clutch PWM solenoid valve control

Notes: transcribed from 2002 Helm manual Vol3/3 Pg 7-123
"TFP" = transmission fluid pressure switch logic from manual valve body

TFP Signals w/ Gear Selector:

Gear SigA Sig B Sig C
P Hi Low Hi
R Low Low Hi
N Hi Low Hi
D4 Hi Low Low
D3 Hi Hi Low
D2 Hi Hi Hi
D1 Low Hi Hi

Other codes are invalid
Hi = IGN, Lo = 0 voltage


You want to ground the Tan/Blk wire to apply the TCC and
you probably have to do something with the PWM solenoid
as well to get full pressure. But I don't know what. If I had to
guess I'd ground that too. Not that I recommend guessing.
Probably best to hook up a DVM and see what these two wires
get up to during normal operation, TCC locked, and go from
there.

Also unknown to me are any faults that might be caught from
jamming these signals to ground on a continuous basis, or from
making an open circuit as seen by the PCM (if, say, you wanted
a complementary force-converter-unlock switch for cruising
around town, you would open-circuit the Tan/Blk)

Solenoid resistance for TCC Solenoid: 24 ohms
Solenoid resistance for TCC PWM Solenoid: 12 ohms

So you would be running a 1A current and probably
want at least a 2A rated relay or switch. If you were
going to disconnect these solenoids from the PWM you
might want to present it a dummy load of the right
value, to keep it happy.

 

thanks for the info sir...i will look into it.

 

the shop where your having the dyno stuff done should have a tech2. it can lock up the tc in any gear you choose, its a hand held that plugs into the obd2 port, really simple and it should be free. the operator will/should know how to set it up...30 seconds to program it and your ready.

FWIW