I was looking at TCC tables and want to make my TCC unlock at lower TPS%. I think I can do that in the Normal Mode MPH v. TPS%. however, looking at the data, the names appear to be reverse of what I thought. The figures for "Release" match up with the speed that my lock-up is currently set to engage in. It looks like by raising the speed at the 60 - 80% TPS range that would accomplish my goal.

My question is: What is the "Apply" speed? I notice that it is higher than the release speed, but not set high enough to get it out of the way (e.g. 2nd gear is set at 256). Is it the speed that the converter will relock once it has been unlocked for a given TPS?

 

I'm not sure what you're asking. When you say you want your TCC to unlock at lower speeds, are you wanting your TCC to release more quickly or just not apply as early?

I'm also not sure what you mean by the apply speed "not set high enough to get it out of the way". You want the TCC to engage at some TPS%, reduce throttle for decel, and have the TCC disengage at some speed below that at which it engaged. The trans in my Expedition is incredibly annoying as the TCC releases almost immediately on throttle reduction (for fuel economy reasons) and you get nice converter flare upon reapplying throttle. Grrr...

<small>[ April 01, 2002, 11:57 PM: Message edited by: ToplessTexan ]</small>

 

Topless, I like your term "converter flare". I agree, it is annoying and makes your throttle pedal feel like a sponge. Was wandering if there is anyway to reduce this feeling when not in lockup?

 

Let me try again: <img border="0" title="" alt="[Embarrassed]" src="gr_emb.gif" />

Currently my converter locks up in 4th gear at about 40 mph under light throttle. This is fine. The problem is when I step hard on the gas, I want it to unlock so that the motor can spin up and make some power.

I Look at my Normal Mode MPH v. TPS% table and observe the following:

All values between 0% and 62% TPS are:

4th Apply = 45
4th Release = 41

1) What does "Apply = 45" mean and what happens, if for example, I change that number to 55?

2) What does "Release = 41" mean and what happens, if for example, I change that number to 50?

My goal is that when I hit 43% TPS to have the converter unlock if my speed is below 70 mph.

While we're at it, <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> My Max% TPS tables are set for 128 for every single entry. What's the deal with that?

TIA <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

First off, the TCC unlocks during shifts. One of the coll new features in v1.05 is a flag to keep it locked during shifts. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

If you raise the 4th apply value to 55 from 45, you just will not engage the TCC as early, having to reach highway speeds first (at that TPS%. I'm assuming that at lower TPS% you still engage it at lower speeds so driving around on surface streets will be more comfortable and efficient.)

If you leave the 4th apply at 45 and raise the 4th release to 50, I think you would probably toggle back and forth between applying and releasing, not good. (Apply has always been greater than release (i.e. the lines did not cross) in all the factory curves I've seen so far) Try it and let us know. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

If you raised 4th apply to 55 from 45 and 4th release to 50 from 41, it would behave as it does now, just at higher speeds. The TCC would unlock as you decellerated through through 50.

I think it's probably best (although I am by no means an expert) to keep the apply curves above the release curves. Given your goal of release at 43% TPS and above if vehicle speed is below 70mph, I'd set your release curve that way and then make sure the apply curve is above it. The big question is at wat TPS% do you want these changes in behavior. It sounds like you've already found that by analyzing your driving habits. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

I haven't got a definitive answer on the 'special value' cells. I've seen 128, 254, 255, 256... v1.05 has some 16 bit quantities too. Generally I don't monkey with it if it's 'special' unless I can get an explanation.

<small>[ April 02, 2002, 11:38 AM: Message edited by: ToplessTexan ]</small>

 

How did you get v1.05?

I got the software last week and I have v1.03 <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

I know that it unlocks during the shift. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> Given my high stall (4200), I decided it would be better to have it unlock and downshift to 3rd at that TPS. Otherwise, it will feel loose because of the high gear. I may change it back if seems like that happens too much.

 

I, um, uh, ... v1.05 in testing at the moment. KenK has leaked some of the features.