K
KLB
What are the pro and cons when it comes to transmissions with or without
Lockup?
Thanks
Lockup?
Thanks
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M
Mike F
KLB said:What are the pro and cons when it comes to transmissions with or without
Lockup?
Thanks
Lockup allows lower revs at highway speeds and removes a source of loss
(the slippage of the torque convertor). Both of these lower
transmission temperature (good) and improve fuel economy. On the con
side, you have one more thing to go wrong, and everything else being
equal, the transmission won't respond as quickly to downshift demands.
All in all, I'd say the balance is overwhelmingly positive for having
this feature.
--
Mike F.
Thornhill (near Toronto), Ont.
Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)
K
KLB
Thanks Mike
Murphy's Law = of course I have the transmission without Lockup. I have
noticed that it shifts a little hard and is slightly slow responding between
park and drive. (110,000 miles, American car rescued into Canada)
I plan to change fluid this weekend, perhaps a flush if all goes well.
One thing I am worried about is that the car rolls backward on a hill if one
lets off the brake when in drive. Not a good sign uh? or is this also
indicative of non-lockup?
Murphy's Law = of course I have the transmission without Lockup. I have
noticed that it shifts a little hard and is slightly slow responding between
park and drive. (110,000 miles, American car rescued into Canada)
I plan to change fluid this weekend, perhaps a flush if all goes well.
One thing I am worried about is that the car rolls backward on a hill if one
lets off the brake when in drive. Not a good sign uh? or is this also
indicative of non-lockup?
R
Robert
I'm not entirely sure if that has to do with lockup or not, but I've
come to notice that cars with rear wheel drive generally only go in the
direction they are set in (i.e., set in drive, doesn't roll back; set
in reverse, doesn't roll forward) and front wheel drive cars roll all
over...but I could be wrong.
Anyway, how do you know whether you have lockup or non-lockup? I've
noticed that my 1993 Volvo 940 seems to shift a little hard and gets
fuel economy in the high teens/low twenties...could this be because it
is non-lockup?
come to notice that cars with rear wheel drive generally only go in the
direction they are set in (i.e., set in drive, doesn't roll back; set
in reverse, doesn't roll forward) and front wheel drive cars roll all
over...but I could be wrong.
Anyway, how do you know whether you have lockup or non-lockup? I've
noticed that my 1993 Volvo 940 seems to shift a little hard and gets
fuel economy in the high teens/low twenties...could this be because it
is non-lockup?
A
Andrew McKenna
From the Volvo Brickboard:Robert said:I'm not entirely sure if that has to do with lockup or not, but I've
come to notice that cars with rear wheel drive generally only go in the
direction they are set in (i.e., set in drive, doesn't roll back; set
in reverse, doesn't roll forward) and front wheel drive cars roll all
over...but I could be wrong.
Anyway, how do you know whether you have lockup or non-lockup? I've
noticed that my 1993 Volvo 940 seems to shift a little hard and gets
fuel economy in the high teens/low twenties...could this be because it
is non-lockup?
" Product Plate Number Coding. The Product Plate is located on the
passenger's side of the front radiator cross brace and has the following
additional information in the five lines on the right of the label: "
Line 2 Digit 2 refers to the Transmission.
If the code is 6 you have AW 70L/71L/72L with lockup
If the code is 7 you have AW 70/71/72 without lockup
http://brickboard.com/FAQ/700-900/700ModelData.htm
Further down the same page it says 940 normally aspirated had the AW 72L
and the turbo had AW 71L. So you should have lockup.
K
KLB
So Robert
Did you check if you had lockup or not? (thanks Andrew) I am interested to
know now since you mentioned that your 93 940 seems to shift a little hard.
Did you check if you had lockup or not? (thanks Andrew) I am interested to
know now since you mentioned that your 93 940 seems to shift a little hard.
B
Bosun
Sorry being from across the pond I think I'm in a boots/trunksKLB said:So Robert
Did you check if you had lockup or not? (thanks Andrew) I am interested to
know now since you mentioned that your 93 940 seems to shift a little hard.
bonnets/hoods thing please what is a "lockup"?
Thanks
Bosun
M
Mike F
Bosun said:Sorry being from across the pond I think I'm in a boots/trunks
bonnets/hoods thing please what is a "lockup"?
Thanks
Bosun
--
A careful driver is one who honks his horn when he goes through a red
light.
Henry Morgan
On an automatic transmission with lockup, there is a clutch built into
the torque convertor. At highway speeds this locks the input and output
shafts of the torque convertor together, which eliminates the slippage
in this fluid coupling. At light throttle settings as you accelerate
through the lockup point, you can feel something like an upshift.
--
Mike F.
Thornhill (near Toronto), Ont.
Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)
R
Robert
Just checked...the car indeed does have a lockup transmission, so I'm
not sure exactly what is going on. It's not a terrible shift, so it
could be normal and I just never noticed it; but my 1998 V70XC is a
whole lot smoother when it comes to shifting...that may have to do with
increased horsepower, though.
I'm not too worried about it...but it's definitely not a
lockup/non-lockup thing.
not sure exactly what is going on. It's not a terrible shift, so it
could be normal and I just never noticed it; but my 1998 V70XC is a
whole lot smoother when it comes to shifting...that may have to do with
increased horsepower, though.
I'm not too worried about it...but it's definitely not a
lockup/non-lockup thing.
B
Bosun
Thank you, yes I to have "lockup"with my 1997 850 GLT I just didn't know it!Mike said:On an automatic transmission with lockup, there is a clutch built into
the torque convertor. At highway speeds this locks the input and output
shafts of the torque convertor together, which eliminates the slippage
in this fluid coupling. At light throttle settings as you accelerate
through the lockup point, you can feel something like an upshift.
Thanks again
Bosun
K
KLB
Well I had half the fluid changed in my non-lockup 945 with 110,000 miles on
it.
Everything seems ok, shifts a little hard, I could do better myself if I had
a clutch but I am sure that there is a lot of folks who wished they had a
standard in their 940. (for all you folks across the pond, lots of US
Dollars waiting to be exchanged for 940 standard transmissions)
I will keep an eye on the gas mileage just to see how much worse the
non-lockup is over the lockup.
Not sure I understand exactly all the differences between the non-lockup and
the lockup but the way it was explained to me was that if I were going down
a steep hill with the cruse control set the non-lockup would not maintain
the cruse setting but would gain in speed. Personally I think the real
answer has a lot to do with which way the wind blows.
Haven't had the car long enough to get the feel of all this, perhaps a
longer trip is in order soon if the price of gas drops a bit more.
Thanks to all that replied
it.
Everything seems ok, shifts a little hard, I could do better myself if I had
a clutch but I am sure that there is a lot of folks who wished they had a
standard in their 940. (for all you folks across the pond, lots of US
Dollars waiting to be exchanged for 940 standard transmissions)
I will keep an eye on the gas mileage just to see how much worse the
non-lockup is over the lockup.
Not sure I understand exactly all the differences between the non-lockup and
the lockup but the way it was explained to me was that if I were going down
a steep hill with the cruse control set the non-lockup would not maintain
the cruse setting but would gain in speed. Personally I think the real
answer has a lot to do with which way the wind blows.
Haven't had the car long enough to get the feel of all this, perhaps a
longer trip is in order soon if the price of gas drops a bit more.
Thanks to all that replied
J
Joerg Lorenz
Bosun said:Thank you, yes I to have "lockup"with my 1997 850 GLT I just didn't know it!
Thanks again
The 850 and the following S/V70s always had lock up from the very
beginning of the production. The shifting strategies changed over time
but the concept remained the same.
Bosun
Joerg, driving a V70 D5 11/2005
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