94 850: Is is possible to change the 2-1 manual downshift speed?

Discussion in 'Volvo 850' started by Doug Warner, Dec 6, 2005.

  1. Doug Warner

    Doug Warner Guest

    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?
     
    Doug Warner, Dec 6, 2005
    #1
    1. Advertisements

  2. Doug Warner

    Steve Guest

    **slightly off topic reply**

    Brakes are cheaper then transmissions!



    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?
     
    Steve, Dec 6, 2005
    #2
    1. Advertisements

  3. Doug Warner

    Douglas Hall Guest

    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).
     
    Douglas Hall, Dec 7, 2005
    #3
  4. Doug Warner

    Doug Warner Guest

    The downshift point is 25 MPH in economy and sport mode.
     
    Doug Warner, Dec 8, 2005
    #4
  5. Doug Warner

    Douglas Hall Guest

    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?
     
    Douglas Hall, Dec 8, 2005
    #5
  6. Doug Warner

    Java Man Guest

    My 95 854T does this routinely on steep hills.

    Rick
     
    Java Man, Dec 8, 2005
    #6
  7. 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.
     
    .................................................., Dec 11, 2005
    #7
  8. Doug Warner

    Douglas Hall Guest

    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.
    What's the thinking behind that?
     
    Douglas Hall, Dec 12, 2005
    #8
  9. 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
     
    Michael Pardee, Dec 12, 2005
    #9
  10. You know...I have absolutely NO idea.
    Hey, this is Las Vegas where normal, rational thinking seems to fly
    right out the window.
     
    .................................................., Dec 13, 2005
    #10
  11. As far as long descents are concerned, I can definitely see the purpose
    of downshifting, but as far as downshifting while coming up to a traffic
    light, it just seems totally counter-productive.
     
    .................................................., Dec 13, 2005
    #11
  12. Doug Warner

    Doug Warner Guest

    I followed a car down a long mountain road, watching brake lights and
    smelling burning brake pads all the way, expecting them to lose it
    when the brake fluid boiled.. Fortunately, the slope ended before
    that.

    Also, it's the engine that absorbs most of the braking energy, not the
    transmission itself. I suppose the torque converter converts some
    kinetic energy to heat as well, but it's not a wear item. The heat
    ends up in the radiator via the transmission cooler.
    Engine braking puts no more wear on the trans than does normal
    driving.
     
    Doug Warner, Dec 14, 2005
    #12
  13. Doug Warner

    Doug Warner Guest

    "........................................................"
    I don't do that either. I use to to control speed on downgrades, and
    to maintain slow traffic crawl speeds without braking every 10
    seconds. Now, with a manual trans, I'd downshift, if I thought the
    light might turn green soon, so I'd be in a good gear to accelerate
    again. Otherwise, when the speed got too low, I'd just shift to
    neutral.
     
    Doug Warner, Dec 14, 2005
    #13
  14. I'm glad that you agree with me. Downshifting for a red light which I
    think is what the OP alluded to is just ludicrous. Very true what you
    say about putting no more wear than normal driving. Every time that
    bands and clutches engage and disengage there is wear. If you were to
    downshift at every light, you would be creating twice the wear. Don't
    delude yourself that the wimpy little coil in the radiator is doing a
    whole hell of a lot, it's a marginal stopgap at best even when
    everything is new.
    I just gotta tell you something funny. Last Summer, one of the hottest
    Summers on record here In Las Vegas, I went into the dealer for an oil
    change. As I was waiting, I walked around the entire building to smoke a
    cigarette (Don't go there). At the far rear of the lot, I saw this guy
    with an electric "pusher" that he was using to push an XC wagon into the
    very rear next to a wall. I walked over because I was interested in this
    machine and when I asked what was wrong with the car that they were
    pushing he just said "transmission...these hot days really bring them
    in". When I asked how many of the cars in the lot were in for
    transmission repairs, he pointed to the last two rows. TWENTY-THREE of
    them, all under five years old. He then added, "Oh, we have fifteen more
    in the storage lot".
    No wonder that they now have Volvos go into neutral when you come to a
    stop. Too bad it doesn't do it when the A.C. is on. With the kind of
    driving that I do, I think that I'll have the trans flushed on a yearly
    basis. I can just imagine a transmission failure on a 123 degree day
    with clients in the car.
     
    .................................................., Dec 21, 2005
    #14
  15. pushing he just said "transmission...these hot days really bring them
    Fortunately, manual transmissions don't break as easily, and a sizable
    fraction of Volvo models (S40,V50,S60,V70 but not S80 or the XCs) are
    offered with one. One more reason why slusheeboxes[*] suck.

    [*]- The exceptions to this rule seem to be the AW7x boxes offered on the
    old RWD Volvos. Those seem to be pretty bulletproof, and maybe even
    better than the 4+OD manual trannies offered on the same cars.

    -Andrew
     
    Andrew Szafran, Dec 21, 2005
    #15
  16. Doug Warner

    Ed Guest

    "........................................................"
    How about the noise produced by semis when they downshift?
     
    Ed, Feb 1, 2006
    #16
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.