a few feature requests
Posted: Sun Jun 11, 2017 8:11 pm
i've been putting off making this post for awhile now. i have a few things i would like to see get added or changed
first the easier things
1. be able to change leaving torque locked during shifts. leaving it locked on shifts on high stall converters is a necessity to avoid rpm flares between 3-4 shifts while converter is unlocked. for example light acceleration running at 1800 rpm in 3rd unlock for 4th rpms jump to stall speed for that throttle position(abut 2500) then drop to 1400 for lockup. the car actually looses acceleration during this period.
when there is a stockish converter the 3-4 shift is harsh.
2.have a generic output or cooling fan control
the last part is a bit more in depth about shifting timing.
i did a big upgrade for my friends 4l80e. a few hard parts,roller conversion, friction upgrades and a d3 transbrake. line pressure is now fixed, no accumulators and the trans should be reliable to 1000hp. the on thing i didn't expect is the increase in time in the 1-2 shift. a 1-2 shift is taking .7-.8 seconds not slipping just a delay, i called the manufacturer and they said that is normal. 2-3 is about the same and 3-4 is quicker than the stock valvebody with shiftkit. i looked into this after the first few runs at the track looked goofy
then i overlayed the 1-2 shift from before and after the upgrade. the darker colors is before and the greyed is after
i increased the shift time some and had him take a run he said it was acting funny during the shift, the timing retard came back right before the shift and boost target get upped right at the actual shift occurs, it was working against what we are trying to do, so i just disabled it till hopefully the code can get a few changes.
this is my proposal on this. splitting the shift time into 2 sections. ill just call it A and B for the time being.
in region A the beginning is when the shift is commanded and the end of it is where the shift actually starts. for all intents and purposes A is still in the previous gear transfering torque without slipping or ratio change. this seems to me to be the time in which it takes for the field in the solenoid to colapse plus the time it takes to vent the signal line and move the valves nessesary to make a shift.
region B is where the shift actually occurs.
for region A there is no point in doing torque reduction(timing retard), i would like this to happen in region B.
there is a possibility that once a 1-2 shift has been commanded it can return to 1st if it is reapplied while still in region A, if that is useful or not.
with this trans and what i'd like to see done there would need to be different shift times for different gears
i would also like the "GEAR" to be either split up into "commanded gear" and "in gear" where "in gear" is what is sent to the engine controller so boost by gear dosent come before it is actually in gear or have "GEAR" that is broadcasted after shift time is completed insted of when it is comannded.
first the easier things
1. be able to change leaving torque locked during shifts. leaving it locked on shifts on high stall converters is a necessity to avoid rpm flares between 3-4 shifts while converter is unlocked. for example light acceleration running at 1800 rpm in 3rd unlock for 4th rpms jump to stall speed for that throttle position(abut 2500) then drop to 1400 for lockup. the car actually looses acceleration during this period.
when there is a stockish converter the 3-4 shift is harsh.
2.have a generic output or cooling fan control
the last part is a bit more in depth about shifting timing.
i did a big upgrade for my friends 4l80e. a few hard parts,roller conversion, friction upgrades and a d3 transbrake. line pressure is now fixed, no accumulators and the trans should be reliable to 1000hp. the on thing i didn't expect is the increase in time in the 1-2 shift. a 1-2 shift is taking .7-.8 seconds not slipping just a delay, i called the manufacturer and they said that is normal. 2-3 is about the same and 3-4 is quicker than the stock valvebody with shiftkit. i looked into this after the first few runs at the track looked goofy
then i overlayed the 1-2 shift from before and after the upgrade. the darker colors is before and the greyed is after
i increased the shift time some and had him take a run he said it was acting funny during the shift, the timing retard came back right before the shift and boost target get upped right at the actual shift occurs, it was working against what we are trying to do, so i just disabled it till hopefully the code can get a few changes.
this is my proposal on this. splitting the shift time into 2 sections. ill just call it A and B for the time being.
in region A the beginning is when the shift is commanded and the end of it is where the shift actually starts. for all intents and purposes A is still in the previous gear transfering torque without slipping or ratio change. this seems to me to be the time in which it takes for the field in the solenoid to colapse plus the time it takes to vent the signal line and move the valves nessesary to make a shift.
region B is where the shift actually occurs.
for region A there is no point in doing torque reduction(timing retard), i would like this to happen in region B.
there is a possibility that once a 1-2 shift has been commanded it can return to 1st if it is reapplied while still in region A, if that is useful or not.
with this trans and what i'd like to see done there would need to be different shift times for different gears
i would also like the "GEAR" to be either split up into "commanded gear" and "in gear" where "in gear" is what is sent to the engine controller so boost by gear dosent come before it is actually in gear or have "GEAR" that is broadcasted after shift time is completed insted of when it is comannded.