L37 gear shifts at what speeds?
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Results 1 to 4 of 4
Northstar Engines and System Technical Discussion Discussion, L37 gear shifts at what speeds? in Cadillac Engine Technical Discussion; I was wondering at what speeds does the L37 shift, I know one happens at 35 mph because you can ...
  1. #1
    fpmesiIII's Avatar
    fpmesiIII is offline Cadillac Owners Fanatic
    Automobile(s): 1996 Cadillac Seville STS (167k)
    Join Date
    May 2005
    Location
    Western NY
    Posts
    473

    L37 gear shifts at what speeds?

    I was wondering at what speeds does the L37 shift, I know one happens at 35 mph because you can feel it. but I was wondering when the gears switch at what speeds do they switch?

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    danbuc's Avatar
    danbuc is offline Cadillac Owners Connoisseur
    Automobile(s): '87 Jeep, '10 Thruxton, '00 Duc 748, '01 748R (853cc)
    Join Date
    Mar 2004
    Location
    Mahwah, NJ
    Age
    29
    Posts
    3,703

    Re: L37 gear shifts at what speeds?

    Are you looking for every possible shift point, or just at WOT?

    At WOT, the 1-2 occurs around 42mph and the 2-3 Shift occurs around 80mph. I haven't found a long, straightenough road to see where the 3-4 shift occurs, but something tells me it's probably around 120mph judging by the gap in speed between 1st, 2nd, and 3rd gear.


    As for the other shift point, they're shown for 10, 20, and 50 TPS %

    1-2 shift @ +/- 3mph- 8 / 18 / 37

    ........................%TPS- 10 / 25 / 50


    2-3 shift @ +/- 3mph- 14 / 34 / 68

    ........................%TPS- 10 / 25 / 50


    3-4 shift @ +/- 3mph- 23 / 55 / 112

    ........................%TPS- 10 / 25 / 50

    VCC apply in Fourth Gear- 42mph


    As I mentioned before, at WOT the values are higher, but the FSM doesn't list those values (I wonder why....)

  4. #3
    fpmesiIII's Avatar
    fpmesiIII is offline Cadillac Owners Fanatic
    Automobile(s): 1996 Cadillac Seville STS (167k)
    Join Date
    May 2005
    Location
    Western NY
    Posts
    473
    Thread Starter

    Re: L37 gear shifts at what speeds?

    Quote Originally Posted by danbuc
    Are you looking for every possible shift point, or just at WOT?

    At WOT, the 1-2 occurs around 42mph and the 2-3 Shift occurs around 80mph. I haven't found a long, straightenough road to see where the 3-4 shift occurs, but something tells me it's probably around 120mph judging by the gap in speed between 1st, 2nd, and 3rd gear.


    As for the other shift point, they're shown for 10, 20, and 50 TPS %

    1-2 shift @ +/- 3mph- 8 / 18 / 37

    ........................%TPS- 10 / 25 / 50


    2-3 shift @ +/- 3mph- 14 / 34 / 68

    ........................%TPS- 10 / 25 / 50


    3-4 shift @ +/- 3mph- 23 / 55 / 112

    ........................%TPS- 10 / 25 / 50

    VCC apply in Fourth Gear- 42mph


    As I mentioned before, at WOT the values are higher, but the FSM doesn't list those values (I wonder why....)
    cool thanks for the info. but what does %TPS mean and VCC? i'm trying to read the charts under non-WOT.

  5. #4
    danbuc's Avatar
    danbuc is offline Cadillac Owners Connoisseur
    Automobile(s): '87 Jeep, '10 Thruxton, '00 Duc 748, '01 748R (853cc)
    Join Date
    Mar 2004
    Location
    Mahwah, NJ
    Age
    29
    Posts
    3,703

    Re: L37 gear shifts at what speeds?

    %TPS is the the amount of throttle opening that the Throttle Position Sensor is reading. In other words, a TPS reading of 10% means that the throttle plate is opened to 10% of of WOT (Wide open throttle). A reading of %25 would mean the throttle is open to 25% and so on and so forth. Depending on how much gas you give it, determines when the vehicle will shift. The more gas, the longer it will hold the shifts to make use of the added power.

    VCC is your Viscous Converter Clutch.....or more simply put, your locking torque converter. 42mph, is the point at which the PCM commands the friction plate inside the converter to apply and lock it. It helps on gas mileage by providing a solid link between the engine and tranny like a traditional clutch, instead of the the slippage one normally sees from a torque converter.

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting