Stator lock in?
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Stator lock in?
why does the stator unlock every time I let of the gas on my 2004 6.0, I have been trying to increase the gas milage on my truck and to me the number one problem is that every time I let of the pedel the stator unlocks increasing my rpm by 400. in my chevy the stator only unlocked if I touched the brakes or down shifted.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,704
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From: SE Florida
The torque converter clutch and the torque converter stator are two separate parts inside the torque converter. It's your converter clutch that is unlocking when you lift off the pedal.
It's done that way in the software by design. Yes, it is supposed to do that. The easiest way to change it is to get a custom chip that eliminates this.
It's done that way in the software by design. Yes, it is supposed to do that. The easiest way to change it is to get a custom chip that eliminates this.
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,704
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From: SE Florida
The short answer is that management liked it better that way.
We found a condition where we needed the converter to unlock with the go pedal released. If you are power on with the converter locked and quickly drop the go pedal, then quickly get back on it, the truck will go into oscillations. I went for a drive to duplicate this because we had a customer complain about it. It was AMAZING! I thought I was holding my right foot steady on the go pedal, but the data showed I was rapidly pushing it down and letting it up. The truck was jerking back and forth rapidly. I had things in the cab flying all over! I've never seen anything like it. I then changed the program to unlock the converter when the go pedal was released and I couldn't make this happen again. Went back to the staying locked program and I could make it happen every time.
I proposed a software change that only unlocked when it recognized this condition, but I was shot down. The early '99s did stay locked, I don't remember when it was changed to unlock at closed pedal.
We found a condition where we needed the converter to unlock with the go pedal released. If you are power on with the converter locked and quickly drop the go pedal, then quickly get back on it, the truck will go into oscillations. I went for a drive to duplicate this because we had a customer complain about it. It was AMAZING! I thought I was holding my right foot steady on the go pedal, but the data showed I was rapidly pushing it down and letting it up. The truck was jerking back and forth rapidly. I had things in the cab flying all over! I've never seen anything like it. I then changed the program to unlock the converter when the go pedal was released and I couldn't make this happen again. Went back to the staying locked program and I could make it happen every time.
I proposed a software change that only unlocked when it recognized this condition, but I was shot down. The early '99s did stay locked, I don't remember when it was changed to unlock at closed pedal.
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The short answer is that management liked it better that way.
We found a condition where we needed the converter to unlock with the go pedal released. If you are power on with the converter locked and quickly drop the go pedal, then quickly get back on it, the truck will go into oscillations. I went for a drive to duplicate this because we had a customer complain about it. It was AMAZING! I thought I was holding my right foot steady on the go pedal, but the data showed I was rapidly pushing it down and letting it up. The truck was jerking back and forth rapidly. I had things in the cab flying all over! I've never seen anything like it. I then changed the program to unlock the converter when the go pedal was released and I couldn't make this happen again. Went back to the staying locked program and I could make it happen every time.
I proposed a software change that only unlocked when it recognized this condition, but I was shot down. The early '99s did stay locked, I don't remember when it was changed to unlock at closed pedal.
We found a condition where we needed the converter to unlock with the go pedal released. If you are power on with the converter locked and quickly drop the go pedal, then quickly get back on it, the truck will go into oscillations. I went for a drive to duplicate this because we had a customer complain about it. It was AMAZING! I thought I was holding my right foot steady on the go pedal, but the data showed I was rapidly pushing it down and letting it up. The truck was jerking back and forth rapidly. I had things in the cab flying all over! I've never seen anything like it. I then changed the program to unlock the converter when the go pedal was released and I couldn't make this happen again. Went back to the staying locked program and I could make it happen every time.
I proposed a software change that only unlocked when it recognized this condition, but I was shot down. The early '99s did stay locked, I don't remember when it was changed to unlock at closed pedal.
Now that I think about it when coasting downhill in my aerostar I often hit the
unlock button to slow me down so I don't have to use the brakes...rotors too small issue. So it stays locked.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,704
Likes: 2,625
From: SE Florida
This would take a lot more than custom tunes, it would take custom software to change the operating system. It would be very involved, and if you could even find someone that could do it, it would be very expensive.
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The torque converter clutch and the torque converter stator are two separate parts inside the torque converter. It's your converter clutch that is unlocking when you lift off the pedal.
It's done that way in the software by design. Yes, it is supposed to do that. The easiest way to change it is to get a custom chip that eliminates this.
It's done that way in the software by design. Yes, it is supposed to do that. The easiest way to change it is to get a custom chip that eliminates this.
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