Differential settings
Jan 2, 2014 16:13:37 GMT
Post by cageyh on Jan 2, 2014 16:13:37 GMT
I hope this helps clear up the confusion regarding Diff Pump settings on a 2WD car.
Differential Lock+acel/decel
Hope this helps.
Differential Pump - This is the setting you all are most familiar with. With the F1 cars and most other mods, it is referred to just as the Differential Lock. Diff Pump works just like a viscous differential coupling, with spinning plates and a viscous fluid.
The HowStuffWorks explanation:
The viscous coupling has two sets of plates inside a sealed housing that is filled with a thick fluid, as shown in below. One set of plates is connected to each output shaft. Under normal conditions, both sets of plates and the viscous fluid spin at the same speed. When one set of wheels tries to spin faster, perhaps because it is slipping, the set of plates corresponding to those wheels spins faster than the other. The viscous fluid, stuck between the plates, tries to catch up with the faster disks, dragging the slower disks along. This transfers more torque to the slower moving wheels -- the wheels that are not slipping.
When a car is turning, the difference in speed between the wheels is not as large as when one wheel is slipping. The faster the plates are spinning relative to each other, the more torque the viscous coupling transfers. The coupling does not interfere with turns because the amount of torque transferred during a turn is so small. However, this also highlights a disadvantageof the viscous coupling: No torque transfer will occur until a wheel actually starts slipping.
You'll see in telemetry that setting this to 100% does not mean that your rear wheels are firmly locked together, but it does offer a nice stabilizing force in yaw and generally better traction while accelerating. The downside of a higher setting can be understeer and you may not likehow the chassis loses some of it's responsiveness.
This setting can be used alone to set up your differential (after all this is the only setting available with the standard F1 cars). It is highly advised that you use Diff Pump in conjunction with PowerSide and CoastSide as there are some shortcomings of those two settings with respect to the ramp angle&clutch pack setup you may be familiar with from GPL. In this case you can kinda treat DiffPump as the clutch pack to smooth the action from one side to the other.
Differential Power Side - This setting, together withCoast Side, work somewhat like the ramp angles of a typical clutch plate differential. The simplest way to describe how it works is that if a different amount of torque is being applied to the drive wheels, the differential will transmit a certain percentage of that difference through the axles in attempt to equalize the driving/braking torque on either side of the car. Still not so simple an explanation, eh? Think of it in cause and effect then: Setting the power side to 100% means that, when you are on the gas, the rear wheels lock together. A setting of 0% means that power will follow the path of least resistance and you'll get a one-wheel burnout (much like in an open differential). Anything in between will give you...well something in between.
Differential Coast Side - Works just like Diff Power Side, except under braking torques rather than power. Most effective at controling how the car behaves during turn in, as you are usally still braking somewhat while doing that. Higher settings will feel more stable but cause understeer. Too low a setting can allow the carto violently snap away from you during braking.
Differential Preload - Diff Preload is something like a clutch that must be disengaged before wheelspin can occur. Higher settings mean that alarger difference in wheel torques must be present before any wheelspin, and thus differential action, happen. For the Sport35Lcars this has little effect, but will be more important in later addon cars which sometimes ran a spool - locked - differentialfor added stability. In those cases there will only be two settings available:
0 - typical parasitic locking caused by friction of parts. Relatively small and wheelspin willeasily begin
1 -Spool diff. No way will you reach the preload value and the rear wheels will be solidly locked together. Can give stability at the cost of understeer and very likely will completely change the driving characteristics of the car.
Hope this helps.
Differential Pump - This is the setting you all are most familiar with. With the F1 cars and most other mods, it is referred to just as the Differential Lock. Diff Pump works just like a viscous differential coupling, with spinning plates and a viscous fluid.
The HowStuffWorks explanation:
The viscous coupling has two sets of plates inside a sealed housing that is filled with a thick fluid, as shown in below. One set of plates is connected to each output shaft. Under normal conditions, both sets of plates and the viscous fluid spin at the same speed. When one set of wheels tries to spin faster, perhaps because it is slipping, the set of plates corresponding to those wheels spins faster than the other. The viscous fluid, stuck between the plates, tries to catch up with the faster disks, dragging the slower disks along. This transfers more torque to the slower moving wheels -- the wheels that are not slipping.
When a car is turning, the difference in speed between the wheels is not as large as when one wheel is slipping. The faster the plates are spinning relative to each other, the more torque the viscous coupling transfers. The coupling does not interfere with turns because the amount of torque transferred during a turn is so small. However, this also highlights a disadvantageof the viscous coupling: No torque transfer will occur until a wheel actually starts slipping.
You'll see in telemetry that setting this to 100% does not mean that your rear wheels are firmly locked together, but it does offer a nice stabilizing force in yaw and generally better traction while accelerating. The downside of a higher setting can be understeer and you may not likehow the chassis loses some of it's responsiveness.
This setting can be used alone to set up your differential (after all this is the only setting available with the standard F1 cars). It is highly advised that you use Diff Pump in conjunction with PowerSide and CoastSide as there are some shortcomings of those two settings with respect to the ramp angle&clutch pack setup you may be familiar with from GPL. In this case you can kinda treat DiffPump as the clutch pack to smooth the action from one side to the other.
Differential Power Side - This setting, together withCoast Side, work somewhat like the ramp angles of a typical clutch plate differential. The simplest way to describe how it works is that if a different amount of torque is being applied to the drive wheels, the differential will transmit a certain percentage of that difference through the axles in attempt to equalize the driving/braking torque on either side of the car. Still not so simple an explanation, eh? Think of it in cause and effect then: Setting the power side to 100% means that, when you are on the gas, the rear wheels lock together. A setting of 0% means that power will follow the path of least resistance and you'll get a one-wheel burnout (much like in an open differential). Anything in between will give you...well something in between.
Differential Coast Side - Works just like Diff Power Side, except under braking torques rather than power. Most effective at controling how the car behaves during turn in, as you are usally still braking somewhat while doing that. Higher settings will feel more stable but cause understeer. Too low a setting can allow the carto violently snap away from you during braking.
Differential Preload - Diff Preload is something like a clutch that must be disengaged before wheelspin can occur. Higher settings mean that alarger difference in wheel torques must be present before any wheelspin, and thus differential action, happen. For the Sport35Lcars this has little effect, but will be more important in later addon cars which sometimes ran a spool - locked - differentialfor added stability. In those cases there will only be two settings available:
0 - typical parasitic locking caused by friction of parts. Relatively small and wheelspin willeasily begin
1 -Spool diff. No way will you reach the preload value and the rear wheels will be solidly locked together. Can give stability at the cost of understeer and very likely will completely change the driving characteristics of the car.
- cheers Kev.