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Old 09-07-2017, 09:33 AM   #1
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8.1 rpms varying

Occasionally the rpms on my rig will vary by 200 or so rpms. There is no misses or stutters.its as if I am depressing and letting up the gas pedal but Im not. Happens on or off cruise control. Flat or level terrain and not a hard pull. Looking for suggestions I don't believe the tranny is downshifting as I had my cluster indicating the gear I was in
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Old 09-07-2017, 12:12 PM   #2
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What speed and rpm's is it happening at? Could be just dropping down to 5th from 6th on a slight incline? Do you have the 6 speed Allison? May be something else like electrical signal interference if it's not shifting, you did say you were watching the display.
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Old 09-07-2017, 08:50 PM   #3
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It would be interesting to see if it does it with overdrive off.
What is the year of your chassis? Is it the 8.1L engine with Allison Transmission?
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Old 09-07-2017, 09:14 PM   #4
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Only 200 RPM , I doubt if this is a gear down shift ; BUT ; the possibility of the torque converter going in/out of lock-up is there.

If this is happening when operating in cruise ;
Are you always using the cruise control at the same speed ?
If you increase the speed ; say by 5 MPH ; on the same road , do you see the same change in RPM, at the slightly higher speed ?
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Old 09-07-2017, 10:43 PM   #5
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Quote:
Originally Posted by Skip426 View Post
Only 200 RPM , I doubt if this is a gear down shift ; BUT ; the possibility of the torque converter going in/out of lock-up is there.

If this is happening when operating in cruise ;
Are you always using the cruise control at the same speed ?
If you increase the speed ; say by 5 MPH ; on the same road , do you see the same change in RPM, at the slightly higher speed ?

I think Skip is right about the torque converter going in and out of lockup. Transmission shop told me of this variance and said not to worry about it.

Mine does the same thing.
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Old 09-08-2017, 10:39 PM   #6
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At 60 mph, when my 6 speed Allison kickes down from 6thh to 5th it drops 500 rpm.
Just a thought.
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Old 09-18-2017, 06:10 PM   #7
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Hi
I noticed my rpms fluctuating about 200 on my last trip. Usually between 60 and 65. overdrive on and off. I also noticed it seemed to be bump related. It seemed to happen during or right after a good bump. How concerned should I be? Another trip to a race in Texas next month.
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Old 09-20-2017, 06:38 PM   #8
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Quote:
Originally Posted by Skip426 View Post
Only 200 RPM , I doubt if this is a gear down shift ; BUT ; the possibility of the torque converter going in/out of lock-up is there.

If this is happening when operating in cruise ;
Are you always using the cruise control at the same speed ?
If you increase the speed ; say by 5 MPH ; on the same road , do you see the same change in RPM, at the slightly higher speed ?
it is NOT a downshift it is in 6th gear when I notice it and it doesn't make a difference when I change speed. I don't understand the torque converter idea. Please explain.
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Old 09-21-2017, 08:55 AM   #9
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Torque converter " lock up " is a function of modern automatic transmissions .
Internal in the torque converter is a plate that resembles a manual transmission clutch plate . As the transmission controller senses the correct conditions the lock up plate in the torque converter is applied , to provide a solid link between the engine and the transmission , for best fuel economy, and allowing the transmission to run cooler.
This function; lock up ; allows the solid link to be accomplished at a lower engine RPM than a standard torque converters , hydraulic lock up ( the point when the converters drive and driven vanes are turning at the same speed, sometimes referred to as the torque converters " stall rpm " .
The controller will dis-engage lock up to prevent drive line " shudder " similar to operating a car with a manual transmission in to high a gear for the vehicle speed .
On transmissions without the torque converter lock up plate ; hydraulic lock wouldn't occur until 2,400 rpm and higher, and below that rpm the torque converter would continually be heating the fluid in the converter.
I'll see if I can find any online files with diagrams and maybe a better description.
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Old 09-24-2017, 01:29 PM   #10
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Quote:
Originally Posted by Skip426 View Post
Torque converter " lock up " is a function of modern automatic transmissions .
Internal in the torque converter is a plate that resembles a manual transmission clutch plate . As the transmission controller senses the correct conditions the lock up plate in the torque converter is applied , to provide a solid link between the engine and the transmission , for best fuel economy, and allowing the transmission to run cooler.
This function; lock up ; allows the solid link to be accomplished at a lower engine RPM than a standard torque converters , hydraulic lock up ( the point when the converters drive and driven vanes are turning at the same speed, sometimes referred to as the torque converters " stall rpm " .
The controller will dis-engage lock up to prevent drive line " shudder " similar to operating a car with a manual transmission in to high a gear for the vehicle speed .
On transmissions without the torque converter lock up plate ; hydraulic lock wouldn't occur until 2,400 rpm and higher, and below that rpm the torque converter would continually be heating the fluid in the converter.
I'll see if I can find any online files with diagrams and maybe a better description.
Thank You.
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Old 09-25-2017, 05:43 PM   #11
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Brief description on page 14 .
Still looking .
U tube video ( 0.46 sec ) available too ; If you do an " Allison 1000 series torque converter lock up " search on Google.
Attached Files
File Type: pdf 1000_2000_operators.pdf (1.40 MB, 24 views)
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