I need a way to get my TCC to release with less throttle. For example cruising in 4th gear with the TCC engaged at 60mph, I need a way to get the tcc to release with about 25% tps or so. Reason being with high compression on pump gas with the lockup engaged it puts too heavy a load on the engine and makes it knock (audibly as well as knock sensor). I think this could be easily cured by simply unlocking my 3200 stall for accelerations over 25% and staying in forth gear.

I'm just not sure if i can bump the engage table mph to get it done, or if I need to adjust the release table mph to get it to do it. I know how the engage table works for setting lockup mph... i'm just not sure how to make this thing unlock at the tps% I want at reasonable speeds.

If all else fails I can command a 4-3 shift at a pretty low tps at highway speed but i'd rather just be able to accelerate without the downshift by unlocking the converter.

Thanks for any help.

 

well, its not quite that simple, but its not that hard if you have tuned b4. Alternatively you could run and switch to cancel the lockup feature so you could command it by fingertip. Ill try to take a stab at doing it the correct way though, since I just re-did my whole trans. tune. You seem to know when and where you want it locked and unlocked and thats a big part of it. If you can remember all this when you sit down with tunercats then you just need to visualize it and modify your tcc engage and release points. Remember to keep a buffer between them because you dont want it locking and unlocking when yer cruising at say 60 mph. You will probably need to modify more than just one box or point in the map, but if you're happy with the rest of the lockup/release points then just change that one area. Look at your current normal mode lockup and release maps side by side and I think you'll understand more that im saying. When you bring your release point up at any given point you kind of need to feather the rest in and scale a few others near it. My 3rd and 4th gear engage points are identical to keep the converter on during the shift but the release points are different to keep the engine from bogging out on tipping in to moderate accelleration, but I wasnt having knock issues, just bogging down. Just need to keep the release points lower then the engage points and I spread them at least 2 mph on the low rpm to about 20 mph in 4th gear 50% throttle. I still need to make a couple minor tweaks to get it perfect, but hopefully you get the idea.

I kind of used lockup as an intermediate gear between 3rd and 4th and brought 4th gear in later, which required a whole shift point map re-scale. Why, you may ask. Because the 3rd gear to 4th gear drop in rpm is just silly. You're going from 1:1 to .7:1. Not much different. BUT if you bring in lockup in 3rd gear it drops engine rpm almost 1K. Then I just scaled 4th gear up in the maps to come in later. Theres a lot of fine tuning involved once you implement it but i blew through it in 5 tunes and maybe 10 test drives. I found more power daily driving it this way vs. having to almost completely lose 3rd gear lockup and go into 4th gear then delay lockup til about 55 mph and when you try to get on it in that range of say 50 mph and your locked up trying to keep rpm down then it has to release lockup, kickdown to 3rd, maybe 2nd......too much bs going on and too much time wasted. Now im not saying everyone should do it this way, but for me and my driving style and traffic situations I like it.

 

Lets just say its not my first day with tunining lt1's.

I understand the engage table and I have that set to where I want it. I dont lock in 3rd gear at all because it bogs the motor. It locks in 4rth at 49mph. The engage table I understand, when its over the mph and at or below whatever the tps setting is its going to engage. In my engage tables anything below 40% throttle over 49mph and it engages.

I also understand that in the release table if I drop below 44mph and have between 0 throttle and 30%, it will release.

Whats confusing is I need it to release when I give it more throttle and mph like passing somebody in 4rth gear. Then reengage when I get off the throttle which it should already do because I would be at low tps and over the 49mph which I have set in the engage table after i'm done speeding up.

I guess what I need to do is set the release table up to 70-80mph or 255 at 25% and above if I want it to unlock at that tps setting.

 

think of it this way, if you'er doing 50 mph and you hit 25% tps, you want it to release, correct? you gotta think this through backwards kind of. You gotta figure your lock points vs. speed vs. tps and then figure at what tps% you want it to unlock at that given speed. Like I said you will end up changing a few blocks, not just 1-2. You want it to release in 4th gear at 25% throttle, but its based on mph also. You need to se where you are at 4th gear and light throttle mph-wise and set the release to something below that point so when you push the pedal down to 25% throttle and the pcm sees that you're not doing the mph, it will release the tcc. Think of it this way, you're doing 50 mph, and you want to accell. You hit 25% throttle and it still wont release. lower the mph at 25% in the release table.

Also, what you said exactly describes why I implemented the TCC engage in 3rd gear then delayed the 4th gear shift. If you hit 3rd and lockup, then 4th with a stock type tune, you'll notice the car bogs like crap. Thats because 4th gear comes in too soon. Lockup is a good thing in 3rd gear, but it need to be correctly timed. I dont think I hit 4th gear until about 50 mph even at light throttle because I use lockup instead to bring the engine rpm down at light throttle.