| Re: 700R4 TC lock-up |
Subject: Re: 700R4 TC lock-up by dan0617 on 2009/6/5 14:29:24 Quote:
If desired you can change the settings I mentioned in my previous post. Trial and error though as to what settings you would like the best. Also, I did what you did with the switch only I removed the wires from the brake switch and jumpered a switch between the 2 of them, effectively eliminating the brake pedal TCC unlock switch and letting me use my switch to unlock the converter any time the computer would normally have it locked. For me this did 2 good things: Doesn't unlock the converter when I touch the brake, then have to rev up to relock when back on the gas, (on decel the converter is set to unlock at 43 mph anyway which works for me) and Lets me lock the converter on my nitrous runs at the top of 2nd gear, and lets me keep it unlocked to 115 or so mph on my non nitrous runs. CC, yes, there is a setting in the tune called "TCC Unlock Prevention Threshlold" that lets you enter the MPH you want the converter to lock at during WOT. If the car is geared and stalled properly for the 1/4 mile, you will likely want it to lock near the top of 2nd gear, or just after the 2-3 shift. If you are running highway gears and the high stall converter is bandaiding them to keep your engine in it's powerband (3.07's and a 2800 stall is my setup, for example), locking that early will drop the rpms way down below the powerband so it is best to lock it up at a higher rpm so the converter keeps stalling longer and keeps the motor in the sweet spot for more of the run. Even then, I've found it best so far for me to lock at around 115 to eliminate the converter stall efficiency loss from slippage at high speeds. Locking it before the 2-3 shift when spraying keeps me off the rev limiter during the shift though, and all the torque from the nitrous and my higher than stock peak torque means it falls right into a sea of torque after the shift. As a side note, the converter is set to lock at WOT in the stock tunes I've seen, but be careful when you add power to your car. IF the converter is stock or like stock, a high powered car will destroy it quickly with WOT locking. |
