Continuously Variable Transmissions (CVT) Gear Ratios

Select from the following manufacturers for more information.

• Chrysler

• Ford

  • Freestyle and Five-hundred

  • Escape Hybrid and Mariner Hybrid

• General Motors

• Honda

• Nissan

  • 2007 Altima Hybrid with RE0F01H Transaxle

• Toyota

  •  2002 - 2008 Prius with the P111 or P112 transaxle.

  •  2006 - 2008 Highlander Hybrid with the P310 transaxle and Q211 rear axle.

  •  2007 - 20008 Camry HV Hybrid with the P311 transaxle

Continuously Variable Transmissions have a low gear ratio and a high gear ratio with infinitely many ratios in-between.  The advantage of a CVT is the ability to keep the engine RPM in it's optimum power output range for all operating conditions.  A vehicle with a CVT transmission can be diagnosed with this software.  Most Chrysler, Ford, GM, Honda, and Nissan CVT's use a drive belt and two variable size pulleys, as shown below, to deliver power to the transaxle final drive planetary gear set.  The Toyota Prius, Ford Escape Hybrid, and Mercury Mariner Hybrid use a gasoline engine and two electric motor-generators (MG1 and MG2) connected to a planetary gear set called the "Power Split Device" to deliver power to the transaxle final drive planetary gear set.

Chrysler CVT Transaxle Gear Ratios

The 2007 Dodge Caliber, Jeep Compass, Jeep Patriot will use a new belt-driven CVT (Jatco JF011E).

On the road test, use a scan-tool to monitor the current gear ratio while the vibration is occurring. If the gear ratio is not available, obtain the drive pulley RPM and the driven pulley RPM.  Divide the drive pulley RPM by the driven pulley RPM to obtain the current gear ratio. For example:

• At low vehicle speeds under hard acceleration , the drive pulley RPM = 2160 and the driven pulley RPM = 919.  2160 / 919 = 2.427:1 gear ratio (Under driven). 

• At high vehicle speeds while holding a steady throttle, the drive pulley RPM = 1710 and the driven pulley RPM = 4340.  1710 / 4340 = 0.394:1 gear ratio (Overdriven).

If the vibration occurs at freeway speeds, the high gear ratio is probably being used.  Once the gear ratio is obtained, record the engine RPM and vibration frequency of the vibration.  After returning to the shop, enter the gear ratio information into the software and use the engine RPM and vibration frequency readings from the road test to plot the vibration worksheet the same way you would any other vehicle.

• See a photo of the transaxle from Jatco

• Visit the Jatco website

 Ford CVT Transaxle Gear Ratios (Preliminary Information)

The 2005-2007 Ford Freestyle and Five-hundred uses a new belt-driven CVT. 

On the road test, use a scan-tool to monitor the current gear ratio while the vibration is occurring. If the gear ratio is not available, obtain the drive pulley RPM and the driven pulley RPM.  Divide the drive pulley RPM by the driven pulley RPM to obtain the current gear ratio. For example:

• At low vehicle speeds under hard acceleration , the drive pulley RPM = 2160 and the driven pulley RPM = 890.  2160 / 874 = 2.47:1 gear ratio (Under driven). 

• At high vehicle speeds while holding a steady throttle, the drive pulley RPM = 1710 and the driven pulley RPM = 4170.  1710 / 4170 = 0.41:1 gear ratio (Overdriven).

If the vibration occurs at freeway speeds, the high gear ratio is probably being used.  Once the gear ratio is obtained, record the engine RPM and vibration frequency of the vibration.  After returning to the shop, enter the gear ratio information into the software and use the engine RPM and vibration frequency readings from the road test to plot the vibration worksheet the same way you would any other vehicle.

Ford Escape / Mercury Mariner Hybrid (Preliminary Information)

The 2005-2007 Ford Escape Hybrid and Mercury Mariner Hybrid use a different style of CVT which is similar to the Toyota Hybrid CVT shown below.  The same method of vibration can be used on this vehicle.

The 2005 Ford Escape Hybrid and Mercury Mariner Hybrid uses split hybrid technology to power the vehicle.  A 4-cylinder gasoline engine drives the planet carrier of a planetary gear set which drives both the ring gear (which is connected to the transmission) and the the sun gear (which is connected to the 28 kW generator motor) in opposite directions.  A 65 kW traction electric motor drives the ring gear of the planetary gear set (which is connected to the transmission), and the generator motor is driven off of the sun gear of the planetary gear set. 

There are three modes of operation:

• When running on gasoline only, the engine rotates the planet carrier causing the sun gear to drive the generator motor and the ring gear to drive the transmission. 

• When running on electricity only, the traction motor rotates the ring gear which directly drives the transmission.  The generator motor can contribute to driving the vehicle by rotating the sun gear.  When the sun gear rotates with the engine off, the planetary carrier is stationary; however, the planet gears will still rotate.  This will allow the power from the generator motor to be transferred to the ring gear which drives the transmission along with the traction motor.

• When running on gasoline and electricity combined, the gasoline engine drives the planet carrier, the traction motor drives the ring gear causing the planetary gear set to lock.  This will cause the generator motor to turn the same speed as the engine and the traction motor which are driving the transmission.

The transmission gear ratio limits and the final drive gear ratio are unknown at this time.  Research will continue to attempt to obtain them.  If you know this information, please let us know by e-mailing customer support at support@vibratesoftware.com .

GM Continuously Variable Transaxle Gear Ratios

The 2002 - 2005 Saturn Vue uses an optional CVT transaxle

On the road test, use a scan-tool to monitor the current gear ratio while the vibration is occurring. If the gear ratio is not available, obtain the drive pulley RPM and the driven pulley RPM.  Divide the drive pulley RPM by the driven pulley RPM to obtain the current gear ratio. For example:

• At low vehicle speeds under hard acceleration , the drive pulley RPM = 2160 and the driven pulley RPM = 890.  2160 / 890 = 2.618:1 gear ratio (Under driven). 

• At high vehicle speeds while holding a steady throttle, the drive pulley RPM = 1710 and the driven pulley RPM = 3860.  1710 / 3860 = 0.443:1 gear ratio (Overdriven).

If the vibration occurs at freeway speeds, the high gear ratio is probably being used.  Once the gear ratio is obtained, record the engine RPM and vibration frequency of the vibration.  After returning to the shop, enter the gear ratio information into the software and use the engine RPM and vibration frequency readings from the road test to plot the vibration worksheet the same way you would any other vehicle.

Honda M4VA CVT Gear Ratios

The Honda Civic HX has used a CVT transaxle since 1996.

On the road test, use a scan-tool to monitor the current gear ratio while the vibration is occurring. If the gear ratio is not available, obtain the drive pulley RPM and the driven pulley RPM.  Divide the drive pulley RPM by the driven pulley RPM to obtain the current gear ratio. For example:

• At low vehicle speeds under hard acceleration , the drive pulley RPM = 2160 and the driven pulley RPM = 890.  2160 / 890 = 2.427:1 gear ratio (Under driven). 

• At high vehicle speeds while holding a steady throttle, the drive pulley RPM = 1710 and the driven pulley RPM = 3779.  1710 / 3779 = 0.452:1 gear ratio (Overdriven).

If the vibration occurs at freeway speeds, the high gear ratio is probably being used.  Once the gear ratio is obtained, record the engine RPM and vibration frequency of the vibration.  After returning to the shop, enter the gear ratio information into the software and use the engine RPM and vibration frequency readings from the road test to plot the vibration worksheet the same way you would any other vehicle.

Nissan Xtronic CVT Gear Ratios

On the road test, use a scan-tool to monitor the current gear ratio while the vibration is occurring. If the gear ratio is not available, obtain the drive pulley RPM and the driven pulley RPM.  Divide the drive pulley RPM by the driven pulley RPM to obtain the current gear ratio. For example:

• At low vehicle speeds under hard acceleration , the drive pulley RPM = 2160 and the driven pulley RPM = 911.  2160 / 911 = 2.371:1 gear ratio (Under driven). 

• At high vehicle speeds while holding a steady throttle, the drive pulley RPM = 1710 and the driven pulley RPM = 3895.  1710 / 3895 = 0.439:1 gear ratio (Overdriven).

If the vibration occurs at freeway speeds, the high gear ratio is probably being used.  Once the gear ratio is obtained, record the engine RPM and vibration frequency of the vibration.  After returning to the shop, enter the gear ratio information into the software and use the engine RPM and vibration frequency readings from the road test to plot the vibration worksheet the same way you would any other vehicle.

Nissan Alrima Hybrid Electric Transaxle JA80A (RE0F01H)

More information to come.  The Hybrid transaxle works similarly to the Toyota P311 shown below.

Toyota (ECCVT) Gear Ratios

Toyota uses three configurations of hybrid electric vehicles.

•  2002 - 2008 Prius with the P111 or P112 transaxle.

•  2006 - 2008 Highlander Hybrid with the P310 transaxle and Q211 rear axle.

•  2007 - 2008 Camry HV Hybrid with the P311 transaxle

2002 - 2008 Prius with the P111 or P112 transaxle.

The Toyota Pruis, a Hybrid-Electric Vehicle, has a gasoline engine and two electric motor-generators (MG1 and MG2) connected to a planetary gear set called the "Power Split Device" to deliver power to the transaxle final drive planetary gear set and charge the batteries. This combination of electric motors and a gasoline engine; each powering one of three planetary gear set components, provides a transaxle which acts similar to a CVT.  The output from the final drive planetary gear set provides power to the tires.  A Hybrid-Electric vehicle can be diagnosed with this software.  On the road test, use a scan-tool to monitor the MG2 electric motor RPM while the vibration is occurring.  Once the MG2 RPM is obtained, use the MG2 RPM as the engine RPM on the vibration worksheet.  Also record the vibration frequency of the vibration.  After returning to the shop, enter the transaxle gear ratio (1.0) into the software and use the MG2 RPM and vibration frequency readings from the road test to plot the vibration worksheet the same way you would any other vehicle.  Ignore the engine RPM lines (E1 and E2) on the vibration worksheet.

• The MG2 motor-generator could be the source of a vibration.  MG2 RPM = (Vehicle Speed MPH x 1312.08) / (2 x Tire static radius)

• The MG1 motor-generator could be the source of a vibration.  MG1 RPM = (3.6 x Engine RPM) - (2.6 x MG2 RPM)

• The gasoline engine could be the source of a vibration.  Monitor the engine RPM with a scan tool.  A normal vibration would be twice engine RPM, an abnormal vibration would match engine rpm.

2006-2008 Highlander Hybrid with the P310 transaxle and Q211 rear axle.

The 2006-2007 Toyota Highlander Hybrid-Electric vehicle, has a gasoline engine and two electric motor-generators (MG1 and MG2) connected to a planetary gear set called the "Power Split Device" to deliver power to the transaxle final drive planetary gear set and charge the batteries. The P310 MG2 motor-generator uses a motor speed gear reduction planetary gear set (with a 2.47:1 reduction) to provide increased torque to the wheels. This combination of 2 electric motors and a gasoline engine; each powering one of three planetary gear set components, provides a transaxle which acts similar to a CVT.  The output from the final drive planetary gear set provides power to the tires.  A Hybrid-Electric vehicle can be diagnosed with this software.  On the road test, use a scan-tool to monitor the MG2 electric motor RPM while the vibration is occurring.  Once the MG2 RPM is obtained, use the MG2 RPM divided by the motor speed gear reduction planetary gear ratio of 2.47:1 as the engine RPM on the vibration worksheet.  Also record the vibration frequency of the vibration.  After returning to the shop, enter the transaxle gear ratio (1.0) into the software and use the MG2 RPM divided by 2.47 and vibration frequency readings from the road test to plot the vibration worksheet the same way you would any other vehicle.  Ignore the engine RPM lines (E1 and E2) on the vibration worksheet.

• The MG2 motor-generator could be the source of a vibration.  MG2 RPM = ((Vehicle Speed MPH x 1312.08) / (2 x Tire static radius) x 2.47)

• The MG1 motor-generator could be the source of a vibration.  MG1 RPM = (3.6 x Engine RPM) - (2.6 x MG2 RPM)

• The gasoline engine could be the source of a vibration.  Monitor the engine RPM with a scan tool.  A normal vibration would be twice engine RPM, an abnormal vibration would match engine rpm.

2007 - 2008 Camry HV Hybrid with the P311 transaxle

The 2007 Toyota Camry Hybrid-Electric vehicle, has a gasoline engine and two electric motor-generators (MG1 and MG2) connected to a planetary gear set called the "Power Split Device" to deliver power to the transaxle final drive planetary gear set and charge the batteries. The P311 MG2 motor-generator uses a motor speed gear reduction planetary gear set (with a 2.47:1 reduction) to provide increased torque to the wheels. This combination of 2 electric motors and a gasoline engine; each powering one of three planetary gear set components, provides a transaxle which acts similar to a CVT.  The output from the final drive planetary gear set provides power to the tires.  A Hybrid-Electric vehicle can be diagnosed with this software.  On the road test, use a scan-tool to monitor the MG2 electric motor RPM while the vibration is occurring.  Once the MG2 RPM is obtained, use the MG2 RPM divided by the motor speed gear reduction planetary gear ratio of 2.47:1 as the engine RPM on the vibration worksheet.  Also record the vibration frequency of the vibration.  After returning to the shop, enter the transaxle gear ratio (1.0) into the software and use the MG2 RPM divided by 2.47 and vibration frequency readings from the road test to plot the vibration worksheet the same way you would any other vehicle.  Ignore the engine RPM lines (E1 and E2) on the vibration worksheet.

• The MG2 motor-generator could be the source of a vibration.  MG2 RPM = ((Vehicle Speed MPH x 1312.08) / (2 x Tire static radius) x 2.47)

• The MG1 motor-generator could be the source of a vibration.  MG1 RPM = (3.6 x Engine RPM) - (2.6 x MG2 RPM)

• The gasoline engine could be the source of a vibration.  Monitor the engine RPM with a scan tool.  A normal vibration would be twice engine RPM, an abnormal vibration would match engine rpm.

This page was last modified Thursday, June 12, 2008 11:14:59 PM

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