![]() |
Shifting with torque converter locked
Hello everyone, I am wondering if it is bad for my 2005 Honda Civic’s transmission to shift with the torque converter locked up. With my solenoid mods to raise line pressure, it shifts somewhat hard when locked up and I am wondering if this is bad on it. I like hard shifts, but I certainly don’t want to destroy my new (to me) transmission by shifting it with a locked torque converter. I don’t allow it to shift while the converter is locked up because I am unsure of the long term effects of doing do.
Also, I modified my pressure control solenoids so the trans runs at a higher line pressure so it shifts quicker and so the TCC instantly fully applies whenever I want it to. What I did is I unplugged the pressure control solenoids and plugged in extra solenoids so it doesn’t set a code and go into limp mode. I have been running it for about 6K miles this way and nothing bad has happened yet that I can tell, but I am wondering if shifting with high line pressure is bad for the trans in the long run. The trans does not shift excessively hard (by my standards) from the solenoid modifications, so I would expect that this modification could actually extend the life of my trans because it shifts quicker, meaning the clutches engage faster and slip for a shorter amount of time, but I don’t know a lot about automatic transmissions, so I may be missing something. Thank you very much in advance, I really appreciate your help. |
Traditionally, in a powerglide used for racing, no TC, the bands tend to wear out faster, particularly the low one used to get the car moving.
Notice the caveats. The secondary and any other bands of a multi-speed modern trans probably wont see that much additional wear because the ring set is dealing with a moving car. In a powerglide, the low band is gone before anything else so that's the rebuild point. OTOH, the majors unlock the TC between shifts for a reason, albeit for comfort and smoother shifts. Worse case get an analysis on the fluid looking for band residue. |
Quote:
|
I don't know about Honda but old GM vehicles with early th700 transmissions shifted between 3rd and 4th with the converter locked up.
Shifting with the converter locked up customer complaints because you could really feel it when it shifts and it would break transmission mounting bushings. |
Quote:
|
Yeah the early TH700 only had electronic on or off for lock up.
A PWM soft lockup came later for GM. If you can't really feel it shift then there is some electronic or hydraulic trickery going on. By all accounts I have been able to find soft grocery getter shifts ruin transmissions faster as it wears clutches faster than hard shifts. |
Quote:
|
FWIW my '17 Fusion locks the converter after it shifts into 3rd, has a 6 speed trans
I'd like to know why the engineers chose to have it this way. Not saying it's wrong, just curious. |
Quote:
This could also be because some people don’t like the immediate and direct response of getting on and off the throttle that occurs with a locked converter. I notice this more in lower gears. I like the direct response, but some people may feel like it’s harsh. |
I had 2 options with my Allison 6sp install.
1 GM style, soft and squishy 1-5(1stOD) 5-6 locked shift 2 Allison style, 1-2,lock 3-6 locked shifts GM went this way for a soft fill not longevity or controlling excessive heat. Allison, went for longevity @ up to 26k lbs. Ether way the TCM adjusts the apply and release solenoids timing(when) and rate (how much time it takes each) to make smooth shifts independent of controlling line pressure. Uncontrollable line pressure WILL destroy the trans with extremely violent shifts as timing and rate alone are inadequate. Read up on how your particular trans controlls shift firmness. A shift kit may be the better option. |
All times are GMT -4. The time now is 09:21 PM. |
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2025, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com