I have an Art Carr 4L60E and an Art Carr 3200 9.5 inch stall. Its set to lock up in overdrive and it works great. But My engine builder and the dyno guy said I should tell the PCM to LOCK the converter when at WOT in 2nd and 3rd gear to improve performance. So I did, I dont really notice any difference honestly.

IS this even safe? or will it hurt the converter?

Also I only set the ENGAGE TCC lockup tables but never changed the RELEASE TCC lockup tables.

example in 2nd gear at 100 % TPS its set to lockup at 35 mph or faster, but the RELEASE is still set to 252 MPH at 100% TPS.

I dont notice the car driving any different.....can anyone give me an idea on this ?

 

dont do that....the only time you will get performance out of locking the converter is at the TOP of 3rd gear, nearing the end of the quarter. anything lower than that and the lockup is going to suck the motor down a little out of its powerband, which will cost you a little bit. remember, an automatic is DESIGNED to slip and thats how our RPM gets where it does as fast as it does. if you take the slippage out, the motor has to do more work to keep the RPM up. Also i wouldnt recommend using tuning to get it to lockup. just install a manual lockup switch and flip it somewhere over 5500 rpm in theird gear...its typically worth .1 seconds and 1 mph.