Is it OK ??

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mshawari1

mshawari1

Member
Is it ok to use the LS400 transmission to down shift every time you slow down like the manual one ?? it will burn the internal clutches ??​
 
as far as im aware its perfectly alright to do so, id assume any additional wear and stress will not be noticeable and hardly affect the standard life of the drivetrain.
 
my friend used to do that in his plymouth duster and the transmission failed after only a short time in his hands.
 
in that case, i'd say if you do it you are prepared for the possibility that something will go wrong. :)
 
I think the plymouth transmission is differ than LS400 . The last is more tough.

"Why would you do that? I prefer to use the brake pedal to slow down..."

My hand automatically do that !! I do not know maybe to save the brake and keep your self ready to go fast !!
​
 
With a manual tranny down shifting is a constant, but manually downshifting constantly with the automatic tranny I would think you would wear something out prematurely...Just my guess....
 
If you shouldn't downshift an auto manually, why do they make Tiptronic trasmissions?

When you downshift in the Tiptronic all you are doing is using the paddle/switch/lever to do it electronically rather than manually shifting.

I remember when Powerglides were new (yeah I'm that old!) you were advised to manually downshift on hills because the old drum brakes ween't up to the task of continuos downhill use.

I drive my ML Mercedes like a manual. If I didn't all the Toyota Priuses would run me over.
 
Basic common sense tells me the transmission in accordance with the ECU will downshift as normal on it's own all the time during regular drivng....Using the 1 2 D to downshift now when thinking about it probably won't kill the tranny, maybe wear out the shifter as you will be performing what the transmission does anyway and regularly...I still wouldn't make it a habit, although I find myself doing that every now and then.....
 
you wouldn't think that a tiptronic transmission is designed for this vs. a normal auto?

Zuffen said:
If you shouldn't downshift an auto manually, why do they make Tiptronic trasmissions?

When you downshift in the Tiptronic all you are doing is using the paddle/switch/lever to do it electronically rather than manually shifting.

I remember when Powerglides were new (yeah I'm that old!) you were advised to manually downshift on hills because the old drum brakes ween't up to the task of continuos downhill use.

I drive my ML Mercedes like a manual. If I didn't all the Toyota Priuses would run me over.
Click to expand...
 
And what about circuit use with a automatic? I went on the track last week (TT circuit Assen, NL) and to keep the revs up high, i shifted to "2" when braking for the corner. It downshifted hard enough to shiftlock the rear tires :)

Sure it will give some extra wear, but nothing regular oil changen can't fix it think.
But hell, i'm gonna swap a manual in my car anyway, so why sould I care? :)
 
everytime you downshift the gear, the clutches slip to make the engine revs.

once the transmission is in gear and the engine matches the RPMs, it's ok. So if you are in 2nd gear already then keep it in 2nd gear to slow down, no problem. When it's time for upshifts, the transmission is at high pressures so clutches doesn't slip. On some electronic transmissions, the ECU retard engine timing or cut fuel while the transmission shifts, so the engine add no stress and it's easier for the transmission to drop the engine revs.

you can use it when needed, but i wouldn't use it all day long. Unless you put in in neutral and rev the engine so the clutches won,t slip.
 
The reason the engine timing is retarded is to smooth out the shift so the passengers don't get shaken up.

Plenty of old style transmissions were updated to Tiptronic in the 90's. I agree todays Tiptronic transmissions are designed with this usage pattern in mind.

Given the number of shift an auto does in its life cycle manually shifting it won't make much difference.

The thing that wears auto clutches is the flair (or slip) when changing up. The higher the line pressure the shorter and harsher the shift but the shift is kinder to the transmission.
 
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