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Old 12-05-2005, 23:01   #1 (permalink)
Doug Warner
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94 850: Is is possible to change the 2-1 manual downshift speed?


I routinely downshift my auto trans to maintain speed without braking
in traffic and downhill.
I can get into 2nd by shifting to 1 at speeds above 25MPH, but if I
let the speed drop below 25, it downshifts to 1 with heavy engine
braking, a hazard in traffic.
For smoothness, I feel that the 2-1 shift should occur at 15 MPH.

Does anyone know if it's possible to lower this shift point (2-1 with
lever in 1) without installing a reprogrammed ROM?
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Old 12-06-2005, 08:02   #2 (permalink)
Steve
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Re: 94 850: Is is possible to change the 2-1 manual downshift speed?

**slightly off topic reply**

Brakes are cheaper then transmissions!


"Doug Warner" <dwarner22@ccharter.net> wrote in message
news:90aap11n1mfc3cr3461h38gon11l8re0be@4ax.com...

I routinely downshift my auto trans to maintain speed without braking
in traffic and downhill.
I can get into 2nd by shifting to 1 at speeds above 25MPH, but if I
let the speed drop below 25, it downshifts to 1 with heavy engine
braking, a hazard in traffic.
For smoothness, I feel that the 2-1 shift should occur at 15 MPH.

Does anyone know if it's possible to lower this shift point (2-1 with
lever in 1) without installing a reprogrammed ROM?
--
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Old 12-07-2005, 06:02   #3 (permalink)
Douglas Hall
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Re: 94 850: Is is possible to change the 2-1 manual downshift speed?

>"Doug Warner" <dwarner22@ccharter.net> wrote in message
news:90aap11n1mfc3cr3461h38gon11l8re0be@4ax.com...
>
> I routinely downshift my auto trans to maintain speed without braking
> in traffic and downhill. I can get into 2nd by shifting to 1 at speeds

above
> 25MPH, but if I let the speed drop below 25, it downshifts to 1 with
> heavy engine braking, a hazard in traffic. For smoothness, I feel that the
> 2-1 shift should occur at 15 MPH.
>
> Does anyone know if it's possible to lower this shift point (2-1 with
> lever in 1) without installing a reprogrammed ROM?


What mode do you have the gearbox in, because I believe the economy / sport
modes change the speed at which the downshift occurs - I can't remember
which way round it is, but in one mode, the downshift should be a 25 mph, in
the other mode, I think it's 6 mph (quite a difference).



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Old 12-07-2005, 19:01   #4 (permalink)
Doug Warner
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Re: 94 850: Is is possible to change the 2-1 manual downshift speed?

"Douglas Hall" <@> wrote:


>What mode do you have the gearbox in, because I believe the economy / sport
>modes change the speed at which the downshift occurs - I can't remember
>which way round it is, but in one mode, the downshift should be a 25 mph, in
>the other mode, I think it's 6 mph (quite a difference).
>
>

The downshift point is 25 MPH in economy and sport mode.
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Old 12-08-2005, 04:01   #5 (permalink)
Douglas Hall
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Re: 94 850: Is is possible to change the 2-1 manual downshift speed?

> "Doug Warner" <dwarner22@ccharter.net> wrote in message
news:a75fp1dn28ju0lljddv3a5dt159qn147dt@4ax.com...
> >"Douglas Hall" <@> wrote:
> >What mode do you have the gearbox in, because I believe the economy /

sport
> >modes change the speed at which the downshift occurs - I can't remember
> >which way round it is, but in one mode, the downshift should be a 25 mph,

in
> >the other mode, I think it's 6 mph (quite a difference).

>
> The downshift point is 25 MPH in economy and sport mode.


Ah well it must be different in your age of 850. I have a 98 S70 auto, and
from memory of reading my handbook, and actual use, there is quite a marked
difference between economy and sport mode, in the downshift to 1st when in
L. Recently I had reason to experiment with this, when on holiday, one of
the country lanes, had quite a long descent, that you couldn't really drive
down quickly, so needed the 1st to keep the speed down.

It's the same gearbox, between your 850 and my S70, although I think there
was the odd revision (possibly software only) from the early 850s (I did
once read somebody's account of their early 850 and the gearbox would
downshift, automatically, when off the throttle and descending a hill, for
engine braking - but I've only ever read one account of this).

Do you have your handbook, and does it say anything about this? I'm pretty
sure mine does. So the question, really is a slightly different
implementation - or the possibility that your sport / economy mode switch
isn't working? Can you confirm from the other characteristics, that sport /
economy mode is definitely making a difference?


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Old 12-08-2005, 10:01   #6 (permalink)
Java Man
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Re: 94 850: Is is possible to change the 2-1 manual downshift speed?

In article <4398169b$0$17518$ed9e5944@reading.news.pipex.net>, "Douglas
Hall" <@> says...
> I did
> once read somebody's account of their early 850 and the gearbox would
> downshift, automatically, when off the throttle and descending a hill, for
> engine braking - but I've only ever read one account of this
>

My 95 854T does this routinely on steep hills.

Rick
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Old 12-11-2005, 15:01   #7 (permalink)
..................................................
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Re: 94 850: Is is possible to change the 2-1 manual downshift speed?

I hope that you don't take this the wrong way, but....I've always
wondered why people are do intent upon saving a few hundred dollars in
brakes at the expense of several thousand dollars worth of transmission.

Just as an aside, here in Las Vegas on certain downgrades, there are
signs posted that prohibit downshifting, like on Cheyenne Eastbound from
the Beltway through Summerlin.




Doug Warner wrote:
> I routinely downshift my auto trans to maintain speed without braking
> in traffic and downhill.
> I can get into 2nd by shifting to 1 at speeds above 25MPH, but if I
> let the speed drop below 25, it downshifts to 1 with heavy engine
> braking, a hazard in traffic.
> For smoothness, I feel that the 2-1 shift should occur at 15 MPH.
>
> Does anyone know if it's possible to lower this shift point (2-1 with
> lever in 1) without installing a reprogrammed ROM?
> --
> Email reply: please remove one letter from each side of "@"
> Spammers are Scammers. Exterminate them.

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Old 12-12-2005, 13:01   #8 (permalink)
Douglas Hall
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Re: 94 850: Is is possible to change the 2-1 manual downshift speed?

......................................................... wrote:
> I hope that you don't take this the wrong way, but....I've always
> wondered why people are do intent upon saving a few hundred dollars in
> brakes at the expense of several thousand dollars worth of transmission.


Well for long descents, it's more about brake fade, than saving on
friction material. That's the only reason I'd use lower ratios.

> Just as an aside, here in Las Vegas on certain downgrades, there are
> signs posted that prohibit downshifting, like on Cheyenne Eastbound from
> the Beltway through Summerlin.


What's the thinking behind that?

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Old 12-12-2005, 14:01   #9 (permalink)
Michael Pardee
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Re: 94 850: Is is possible to change the 2-1 manual downshift speed?

"Douglas Hall" <douglashall13th@yahoo.co.uk> wrote in message
news:1134419239.131279.282670@z14g2000cwz.googlegroups.com...
>> Just as an aside, here in Las Vegas on certain downgrades, there are
>> signs posted that prohibit downshifting, like on Cheyenne Eastbound from
>> the Beltway through Summerlin.

>
> What's the thinking behind that?
>

All the signs I've seen are for commercial vehicles with "engine brakes"
("jake brakes") and are in or around towns and cities. We have one here in
town that reads "engine braking prohibited" but I've seen them worded with
"downshifting." Unmuffled engine brakes create that loud BRAPPP noise.
Muffled ones really aren't very loud.

Mike

Mike


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Old 12-13-2005, 12:01   #10 (permalink)
..................................................
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Re: 94 850: Is is possible to change the 2-1 manual downshift speed?



Douglas Hall wrote:
> ........................................................ wrote:
>
>>I hope that you don't take this the wrong way, but....I've always
>>wondered why people are do intent upon saving a few hundred dollars in
>>brakes at the expense of several thousand dollars worth of transmission.

>
>
> Well for long descents, it's more about brake fade, than saving on
> friction material. That's the only reason I'd use lower ratios.
>
>
>>Just as an aside, here in Las Vegas on certain downgrades, there are
>>signs posted that prohibit downshifting, like on Cheyenne Eastbound from
>>the Beltway through Summerlin.

>
>
> What's the thinking behind that?
>

You know...I have absolutely NO idea.
Hey, this is Las Vegas where normal, rational thinking seems to fly
right out the window.
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