How to tune the LSD
- Thread starter Cynical
- 5 comments
- 8,461 views
I've been tuning FF cars for the Seasonal Challenges and I really like having a 10/20/10 setup. It lets the cars rotate enough to make them quite enjoyable to drive. I don't know if it's a universal setting, but it's made a world of difference on the three cars I tuned.
As far as other setups, I royally screwed up my GTR Spec V with the LSD. Any settings for 4WD, FR and MR cars would be great.
As far as other setups, I royally screwed up my GTR Spec V with the LSD. Any settings for 4WD, FR and MR cars would be great.
- 256
- Margate FL USA
- jmii
Normally just tune 4WD cars to drive more like FRs by adjusting the torque split to be more like 20 front / 80 rear.
I would check the Tuning Guides area, I think there is a FAQ on the LSD. If not here is my take: LSD job is to limit the difference in wheel speed from the inside wheel versus the outside wheel. You see when turning around a corner the outside wheel has to travel a further distance, thus it has to turn MORE times around then the inside wheel. The results is two wheels (right and left) have different spinning speeds is they have different grip levels, this causing loss of traction so the wheels slip and you lose control. The LSD can lock the inside wheel and the outside wheel together via the driveshaft, this forces each wheel to rotate at the same speed. So the 3 basic settings work like this:
Inital - this effects how quickly the LSD reacts to the tires spinning, it also an overall power setting for the whole LSD system, turning it all the way down means the Accel and Decel settings don't really effect anything.
Accel - this effects how "locked" the wheels are when accelerating. On an FR (front engine / rear drive) configuration turning this up creates a "posi" style rear end, making it harder for the wheels to spin at different speeds. Think of it as a percentage, the higher number the more the wheels will be held together at the same speed.
Decel (braking) - opposite of the Accel setting, it keeps the wheels locked to each other as the car is slowing down.
If you want to learn how the LSD works I suggest messing with one of the older America muscle cars - since they have gobs of torque the LSD effects are easier to determine. Generally I turn up the Inital a little then turn up the Accel alot but turn down the Decel for this kind of car. If you turn up the LSD too much the car will understeer as the wheels attempt to run at the same speed which forces the car to only going straight ahead. However if the car is spinning out due to oversteer (too much wheel slip) turning up the LSD should fix it. Even FF (front drive / front engine) car can benefit from LSD as they spin their tires and lose grip when accelerating out of a turn.
On a 4WD car you can mess up the handling by doing too many LSD tweaks. 4WD just complicates matters X 2 so like I said above I just adjust the torque differential so the rear gets more power making the car more predictable. I would say adjusting the LSD would be best for Rally situations since the car is constantly sliding all over the place.
