Tourque Conv. Lock Up
 

On the SVX race car that me and Benebob have been working on, we currently have a transmission out of a FWD Impreza 1.8. We are using the SVX TC and the SVX TCU... Now that we have some of the other issues worked out, we noticed a "bogging" while stomping it about 1/2 way through 2nd. It always seems to happen at the exact speed/RPM.

At first we though it was a fuel issue, this afternoon at about the same time we both had the thought of early TC Lockup???

Does this make sense to anyone else??? Can anyone tell me how the TC locks? I'm guessing a signal from the TCU to the trans. I checked out the FSM I have here for an XT6 (basically the same 4eat) and it looks like maybe Sel B is responsible for Lock Up?? If we find the wire going to Sel B and disconnect it would that keep it locked or unlocked?

My other thought is to try out a TCU from the Impreza and see if that will help it shift better?

For now the car is being run in auto crosses only, so I really don't care if the TC never locks again.

So your TC is locking early? At what speed and rpm exactly?

I've found mine will lock at 42mph, even though people say it should only lock at 50 and above. Not sure how your different gear set would make it act.

Hard to say exactly as we are generally more concerned with avoiding cones and reading the course than watching the dash. But it was always right about the same places on the course. It seemed to be about 1/2 way through 2nd.

Also, if we would let off the throttle then slam it back down it would seem to accelerate through it...

I suppose it could be locking, though it usually takes a while at a steady speed before it will do it. If you leave it in 1st, it won't lock.
Anyway you can cut the green/black wire, its on the 16 pin plug, top row,pin No.5, that goes to the TCU to disable solenoid B, though you will get a code posted. You would have to connect a resistor from the cut wire to ground to prevent the code.

Harvey. ;)