4L60E: please help me to get the big picture
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From: Zurich - Switzerland
4L60E: please help me to get the big picture I’m just trying to get the „big picture“ about my (completely original) 4L60E.
Here what I think I understood using LS1Edit:
The transmission will have a certain pressure depending on RPM and on a mechanical pressure regulating valve. This is the max pressure.
Depending on several signals the engine will calculate a certain torque.
Base Pressure vs Torque commands a certain system pressure depending on the gear and on the calculated torque.
Positive Pressure vs Temp takes the system pressure (from Base Pressure vs Torque) and reduce it by a certain % depending on temperature and on the TPS.
Desired Shift Time is the goal value for a shift depending on the gear and on the torque. The PCM will try to achieve this time using the Base Pressure vs Torque of that particular situation.
Here what I really don’t know (hey, it doesn’t mean the rest is correct!!):
Maximum pressure: this value apparently doesn’t affect any other thing (??) Is it a limit?
Max Torque: using Atap I saw that the PCM uses this value as a Desired Torque. The delivered Torque is a certain % of the Desired Torque, and not the force that the engine is really producing. Why?
Some tables have torque as variable value: Desired Shift Time, Base Pressure vs Torque, Upshift Torque Reduction. What happen if the Max Torque or the Delivered Torque is higher than the upper limit of the table? How will the PCM manage the situation?
There are hundreds of transmissions related posts, but still I don’t get it…
Who can help?
THANKS!
Here what I think I understood using LS1Edit:
The transmission will have a certain pressure depending on RPM and on a mechanical pressure regulating valve. This is the max pressure.
Depending on several signals the engine will calculate a certain torque.
Base Pressure vs Torque commands a certain system pressure depending on the gear and on the calculated torque.
Positive Pressure vs Temp takes the system pressure (from Base Pressure vs Torque) and reduce it by a certain % depending on temperature and on the TPS.
Desired Shift Time is the goal value for a shift depending on the gear and on the torque. The PCM will try to achieve this time using the Base Pressure vs Torque of that particular situation.
Here what I really don’t know (hey, it doesn’t mean the rest is correct!!):
Maximum pressure: this value apparently doesn’t affect any other thing (??) Is it a limit?
Max Torque: using Atap I saw that the PCM uses this value as a Desired Torque. The delivered Torque is a certain % of the Desired Torque, and not the force that the engine is really producing. Why?
Some tables have torque as variable value: Desired Shift Time, Base Pressure vs Torque, Upshift Torque Reduction. What happen if the Max Torque or the Delivered Torque is higher than the upper limit of the table? How will the PCM manage the situation?
There are hundreds of transmissions related posts, but still I don’t get it…
Who can help?
THANKS!
TECH Regular
Joined: Feb 2004
Posts: 439
Likes: 1
From: burbank ca
wife
Originally Posted by tici
I’m just trying to get the „big picture“ about my (completely original) 4L60E.
Here what I think I understood using LS1Edit:
The transmission will have a certain pressure depending on RPM and on a mechanical pressure regulating valve. This is the max pressure.
Depending on several signals the engine will calculate a certain torque.
Base Pressure vs Torque commands a certain system pressure depending on the gear and on the calculated torque.
Positive Pressure vs Temp takes the system pressure (from Base Pressure vs Torque) and reduce it by a certain % depending on temperature and on the TPS.
Desired Shift Time is the goal value for a shift depending on the gear and on the torque. The PCM will try to achieve this time using the Base Pressure vs Torque of that particular situation.
Here what I really don’t know (hey, it doesn’t mean the rest is correct!!):
Maximum pressure: this value apparently doesn’t affect any other thing (??) Is it a limit?
Max Torque: using Atap I saw that the PCM uses this value as a Desired Torque. The delivered Torque is a certain % of the Desired Torque, and not the force that the engine is really producing. Why?
Some tables have torque as variable value: Desired Shift Time, Base Pressure vs Torque, Upshift Torque Reduction. What happen if the Max Torque or the Delivered Torque is higher than the upper limit of the table? How will the PCM manage the situation?
There are hundreds of transmissions related posts, but still I don’t get it…
Who can help?
THANKS!
Here what I think I understood using LS1Edit:
The transmission will have a certain pressure depending on RPM and on a mechanical pressure regulating valve. This is the max pressure.
Depending on several signals the engine will calculate a certain torque.
Base Pressure vs Torque commands a certain system pressure depending on the gear and on the calculated torque.
Positive Pressure vs Temp takes the system pressure (from Base Pressure vs Torque) and reduce it by a certain % depending on temperature and on the TPS.
Desired Shift Time is the goal value for a shift depending on the gear and on the torque. The PCM will try to achieve this time using the Base Pressure vs Torque of that particular situation.
Here what I really don’t know (hey, it doesn’t mean the rest is correct!!):
Maximum pressure: this value apparently doesn’t affect any other thing (??) Is it a limit?
Max Torque: using Atap I saw that the PCM uses this value as a Desired Torque. The delivered Torque is a certain % of the Desired Torque, and not the force that the engine is really producing. Why?
Some tables have torque as variable value: Desired Shift Time, Base Pressure vs Torque, Upshift Torque Reduction. What happen if the Max Torque or the Delivered Torque is higher than the upper limit of the table? How will the PCM manage the situation?
There are hundreds of transmissions related posts, but still I don’t get it…
Who can help?
THANKS!
Thread Starter
TECH Fanatic
iTrader: (1)
Joined: Oct 2003
Posts: 1,066
Likes: 1
From: Zurich - Switzerland
Yes, it's about a 4L60E.
I see what each setting is doing saparately, but I still don't get the relationship between the tables.
The most misterious thing is the torque-value in several tables: what will the PCM do if the engin is making more than that?
Example: base pressure vs torque. the table goas from 0 to 320 FtLbs, but the stock engine is rated 350 FtLbs...
The calculated torque is a certain % of the max torque you write in Torque Control (Edit). If you put 100 FtLbs you will see 0-100 depending on the engine load. If 600 then 0-600.
Continental Airlines? Does she often fly to Europe? We could make a deal to carry parts from the States... here US cars parts are expensive like hell
I see what each setting is doing saparately, but I still don't get the relationship between the tables.
The most misterious thing is the torque-value in several tables: what will the PCM do if the engin is making more than that?
Example: base pressure vs torque. the table goas from 0 to 320 FtLbs, but the stock engine is rated 350 FtLbs...
The calculated torque is a certain % of the max torque you write in Torque Control (Edit). If you put 100 FtLbs you will see 0-100 depending on the engine load. If 600 then 0-600.
Continental Airlines? Does she often fly to Europe? We could make a deal to carry parts from the States... here US cars parts are expensive like hell
