tuning a 4k stall
04-27-2007, 10:48 AM
#1
TECH Addict
Thread Starter
iTrader: (8)
Join Date: Sep 2005
Location: The beautiful Kingdom of Bahrain
Posts: 2,401
Likes: 0
Received 0 Likes
on
0 Posts
tuning a 4k stall What exactly do I need to tune? My issues are when cruising it goes into 3rd then the converter locks up really quick after. I'm thinking that I need to adjust the tps / shift or something because that seems to be were it's acting wierd. Any ideas?
04-27-2007, 03:53 PM
#2
TECH Addict
iTrader: (10)
Join Date: Jun 2004
Location: Commerce Twp, MI
Posts: 2,918
Likes: 0
Received 0 Likes
on
0 Posts
You need to adjust your torque converter clutch (TCC) lock-up and release tables. The TCC lockup MPH should not be lower than upshift MPH for that gear (ie 3rd gear lockup and 3>4 part throttle upshift). The release tables need to be lower than the lockup tables for any given TP%.
Also, it may be a good idea to max out the MPH in the first two or three cells (where TP% is low) for the 3rd and 4th TCC lockup. Since the stall is 'looser' than stock, you can experience situations where your RPMs will be too low when the TCC tries to lock up. That will cause the car to jerk/slow down when it does lock up. Maxing out the first couple of cells will only let the TCC lockup when you're on the gas.
Key notes:
If MPH becomes greater than or equal to the value in the lockup table for the current gear and TP%, the converter will lock.
If the converter is locked and MPH becomes less than or equal to the value in the release table for the current gear and TP%, the converter will unlock.
TCC lockup needs to be greater than or equal to the upshift tables for that gear to the next.
Try to avoid lockup in low TP% (<7%) ranges for gears set to lock up with loose aftermarket stalls.
Also, it may be a good idea to max out the MPH in the first two or three cells (where TP% is low) for the 3rd and 4th TCC lockup. Since the stall is 'looser' than stock, you can experience situations where your RPMs will be too low when the TCC tries to lock up. That will cause the car to jerk/slow down when it does lock up. Maxing out the first couple of cells will only let the TCC lockup when you're on the gas.
Key notes:
If MPH becomes greater than or equal to the value in the lockup table for the current gear and TP%, the converter will lock.
If the converter is locked and MPH becomes less than or equal to the value in the release table for the current gear and TP%, the converter will unlock.
TCC lockup needs to be greater than or equal to the upshift tables for that gear to the next.
Try to avoid lockup in low TP% (<7%) ranges for gears set to lock up with loose aftermarket stalls.
04-30-2007, 10:00 AM
#3
TECH Addict
Thread Starter
iTrader: (8)
Join Date: Sep 2005
Location: The beautiful Kingdom of Bahrain
Posts: 2,401
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by SSpdDmon
You need to adjust your torque converter clutch (TCC) lock-up and release tables. The TCC lockup MPH should not be lower than upshift MPH for that gear (ie 3rd gear lockup and 3>4 part throttle upshift). The release tables need to be lower than the lockup tables for any given TP%.
Also, it may be a good idea to max out the MPH in the first two or three cells (where TP% is low) for the 3rd and 4th TCC lockup. Since the stall is 'looser' than stock, you can experience situations where your RPMs will be too low when the TCC tries to lock up. That will cause the car to jerk/slow down when it does lock up. Maxing out the first couple of cells will only let the TCC lockup when you're on the gas.
Key notes:
If MPH becomes greater than or equal to the value in the lockup table for the current gear and TP%, the converter will lock.
If the converter is locked and MPH becomes less than or equal to the value in the release table for the current gear and TP%, the converter will unlock.
TCC lockup needs to be greater than or equal to the upshift tables for that gear to the next.
Try to avoid lockup in low TP% (<7%) ranges for gears set to lock up with loose aftermarket stalls.
Also, it may be a good idea to max out the MPH in the first two or three cells (where TP% is low) for the 3rd and 4th TCC lockup. Since the stall is 'looser' than stock, you can experience situations where your RPMs will be too low when the TCC tries to lock up. That will cause the car to jerk/slow down when it does lock up. Maxing out the first couple of cells will only let the TCC lockup when you're on the gas.
Key notes:
If MPH becomes greater than or equal to the value in the lockup table for the current gear and TP%, the converter will lock.
If the converter is locked and MPH becomes less than or equal to the value in the release table for the current gear and TP%, the converter will unlock.
TCC lockup needs to be greater than or equal to the upshift tables for that gear to the next.
Try to avoid lockup in low TP% (<7%) ranges for gears set to lock up with loose aftermarket stalls.
04-30-2007, 01:27 PM
#4
TECH Regular
iTrader: (7)
Join Date: Jun 2005
Location: Mass
Posts: 438
Likes: 0
Received 0 Likes
on
0 Posts
I would also change the torque reduction table, and under engine diagnostics the misfire table. Torque reduction makes the engine lag a bit before shifting. With the stall converter the engine will think it is misfiring and keep unlocking the converter.