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High Rpm....low speed

Discussion in 'Ask An Owner Operator' started by trucky909, Feb 20, 2020.

Page 1 of 2
  1. Feb 20, 2020 #1
    trucky909

    trucky909 Light Load Member

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    2012 Cascadia....Deleted DD15...10 speed

    Why when shifting....I'm in 7th gear already between 18-20mph....8th at 25mph...9th at 35mph. I'm doing each shift close to 1500 rpms. It's been like this for about a year....cant figure out.

    Before delete....I didn't hit 7th gear till 25 mph for example.

    I've changed clutch, fuel pump, and been on top of PM's....can't figure this issue out. Truck just feels like it has nothing the first 45 seconds....high rpm and shifting at low speeds.

    Any ideas?
     
    trucky909, Feb 20, 2020
    trucky909, Feb 20, 2020
    #1
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  3. Feb 20, 2020 #2
    AModelCat

    AModelCat Road Train Member

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    Speedo calibration off due to ECM being flashed from delete?
     
    AModelCat, Feb 20, 2020
    AModelCat, Feb 20, 2020
    #2
    Roberts450 Thanks this.
  4. Feb 20, 2020 #3
    trucky909

    trucky909 Light Load Member

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    Is this fixable??? Thanks
     
    trucky909, Feb 20, 2020
    trucky909, Feb 20, 2020
    #3
  5. Feb 20, 2020 #4
    x1Heavy

    x1Heavy Road Train Member

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    I am going out on a limb and agree with the ECM being not correct. I don't know how you can have a tractor near top gear at 18 mph. You dealing with a 18 speed perhaps?
     
    x1Heavy, Feb 20, 2020
    x1Heavy, Feb 20, 2020
    #4
  7. Feb 20, 2020 #5
    trucky909

    trucky909 Light Load Member

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    I'll take a look regarding ECM and thanks.... No it's a 10 speed. This is my shift/ rpm sequence from 5th gear

    5th...5 mph to 10mph @1400 rpm

    6th...10 mph to 18/20 mph @ 1500 rpm

    7th...20 mph to 25 mph @ 1500 rpm

    8th...25 mph to 30 mph @ 1500 rpm

    9th...30 mph to 35 mph @ 1500 rpm

    10th....I'm in 10th gear by the 45 mph mark.

    Also....from 5th gear to 9th for example... its hitting 1500 rpm in like 3-4 seconds
     
    trucky909, Feb 20, 2020
    trucky909, Feb 20, 2020
    #5
    x1Heavy Thanks this.
  8. Feb 20, 2020 #6
    baha

    baha Road Train Member

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    Try useing your watch and time how many sec. it takes to go between mi. markers if you are going 60 mph it will take 60 sec. to go 1 mi. -
     
    Last edited: Feb 20, 2020
    baha, Feb 20, 2020
    baha, Feb 20, 2020
    #6
    x1Heavy Thanks this.
  9. Feb 20, 2020 #7
    FoolsErrand

    FoolsErrand Road Train Member

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    Your new clutch is adjusted wrong dude.
     
    FoolsErrand, Feb 20, 2020
    FoolsErrand, Feb 20, 2020
    #7
  10. Feb 21, 2020 #8
    trucky909

    trucky909 Light Load Member

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    You
    If this is the issue....can it be fixed? What about the other suggestions....ECM...speedometor calibration?
     
    trucky909, Feb 21, 2020
    trucky909, Feb 21, 2020
    #8
  11. Feb 21, 2020 #9
    FoolsErrand

    FoolsErrand Road Train Member

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    Is it an eaton trans? Underneath the bellhousing pull the inspection plate and check the throwout clearance. The paper that came with the clutch is the best spec to use but if u dont have it watch a few utube vids.

    Theres a bolt on the pressure plate to adjust the bull gear and get the clearance into spec. Youll need a partner in the cab to check the clearance. I think you need 1/2" on one side' 1/8" on the other and a .010" feeler gauge. Allen wrench works good for the 1/8.


    Why cant you check your actual speed against google maps gps speed on your phone?
     
    FoolsErrand, Feb 21, 2020
    FoolsErrand, Feb 21, 2020
    #9
  12. Feb 21, 2020 #10
    FoolsErrand

    FoolsErrand Road Train Member

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    Did your flywheel get surfaced when you did the clutch?
     
    FoolsErrand, Feb 21, 2020
    FoolsErrand, Feb 21, 2020
    #10
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