Combining Tunes

[cleatus12r]

Originally Posted by 907dave

Besides towing, I dont see why there could not be a Daily tune that (sorry diesel guys) could be more like driving a NA gas rig. Not lookin to set speed / hp records with a Daily tune just think that it could "do" a little more. Maybe I just have not had a good one yet. Guess thats were live tuning comes in.

There are ways of getting what you want. In all honesty, there are very few differences in "daily driving" tunes and performance tunes as far as fuel injection rates and SOI are concerned. Most performance tunes can be mirrored to daily driving tunes. The main differences come with shift points, shift feel, and torque converter clutch apply strategies.

I have had success in actually mapping out shift timing that changes significantly from the first 1/3 of accelerator pedal travel to the second 2/3 of travel. This gives early, comfortable shifts when not on the go-pedal and crisp, later shifts after 1/3 APP. The torque converter is tricky here because the apply speeds are only a guideline. There are always discrepancies in the speed unless parameters in the tuning are changed allow an accurate and "repeatable" TCC apply every time whenever you want it to. Again, more than 1/3 APP would be more aggressive. Unfortunately I haven't figured out how to vary TCC apply rate with a given calculated load. The duty cycle ramp rate in the tuning is based on fluid temperature and time...not load or APP.

Hope this helps.

[907DAVE]

Originally Posted by cleatus12r

Unfortunately I haven't figured out how to vary TCC apply rate with a given calculated load. The duty cycle ramp rate in the tuning is based on fluid temperature and time...not load or APP.

Hope this helps.

Strange....thought it would be controlled by LOAD/APP/RPM. The shift strategy would be the major focus if I were to try to make a program like this. But it still would be nice to have a little extra go up top. Hmmmmm.......you guys make it sound so simple yet I feel I will be totally lost when time comes to make it happen.

Thanks
Dave

[cleatus12r]

Originally Posted by 907dave

Strange....thought it would be controlled by LOAD/APP/RPM.

Logically, that would be the case.

However.....that's not how Ford decided to do it.

That map makes sense; obviously, even a 20W oil like ATF flows slower when it's cold so the map is aimed at how long the TCC takes to apply with fluid of different temperatures.

A second map would be better. I was looking at some more of the "functions" this afternoon and may have come up with how to make the TCC apply more quickly (firmer) with varying APP.

Expect updates.........

[907DAVE]

Originally Posted by cleatus12r

Logically, that would be the case.

However.....that's not how Ford decided to do it.

That map makes sense; obviously, even a 20W oil like ATF flows slower when it's cold so the map is aimed at how long the TCC takes to apply with fluid of different temperatures.

A second map would be better. I was looking at some more of the "functions" this afternoon and may have come up with how to make the TCC apply more quickly (firmer) with varying APP.

Expect updates.........

After thinking about it there must be a map to control TCC vs APP. My current Drag tune will only lock the converter (earlier) at WOT. Otherwise will stay unlocked untill after 3rd gear. Hope you find a way to do this, it would be really cool to have even more control over these things.

[cleatus12r]

Originally Posted by 907dave

After thinking about it there must be a map to control TCC vs APP.

Well that's easy since there are many functions relating TCC apply to APP vs. vehicle speed in each gear. I have MANY variations in these functions because each program type is going to require a different TCC apply speed in different gears. I was speaking more along the lines of TCC apply rate depending on APP. For example, having a less harsh apply while simply accelerating with traffic at less than 1/3 APP but then when you're shoveling the coal to it, have the TCC apply more firmly.

[907DAVE]

Gotcha, would make alot of sense to have that second map to change the TCC application rate. Pretty irritating when the TC "bangs" in when at a light cruisie. Not to get off subject completely but what do the OBS guys do to controll their TCC, thought it was more like an on/off switch, no PWM.

[cleatus12r]

It is an on/off type deal and increasing the feel involves increasing the line pressure. This then requires a reduction of pressure during shifts......