Any one know good numbers and or how the diff works…
In the FM5 tuning lounge there are several tuning guides and discussions about this.
Imagine a high power car like a 2014 Corvette Stingray. If you set the Rear Accel Diff all the way to the right and floor the gas, it spins the tires out, burns some rubber and spins out. If you set the Rear Accel Diff all the way to the left, does this less, and (depending on the power and torque of the car) takes off in a straight line. For front wheel drive cars, the situation is much the same except you are dealing with the Front Diff and not the Rear Diff. Also, most FWD cars won’t spin out with a full 100 diff setting.
As to your question, AWD differentials. Well, they’re simply a combination of the RWD setting, and the FWD setting from my example above however you can pick where the power goes. 50% splits it evenly between the Front and Rear. A 0 Torque split results in an AWD car that behaves like a FWD, and a 100 torque split results in an AWD car that behaves like a RWD car. Anything in the middle is a percentage proportion based on how you set the slider, either more Front or more rear.
Go into the game and give this a try for yourself. It’s the best way to learn and understand how this works. You can read all you want, but if you experience it for yourself first hand, that is the best way to develop an understanding.
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Thanks that gives me a good idea of were ro start.but as you say i need to experiment.
In FH2 I start with the following and tweak from there.
50
0
75
0
65
Many ways to set a 4wd diff. i start around here.
100-80 F-accel
0 F-decel
70-90 R-accel
0-30 R-decel
50-60
I start like FM5 :
30-0
0
75-75
40-60
As for numbers, for AWD I use this typically in FH2:
5
0
30
20
80
I go by the Telemetry screen showing all 4 tires. I turn the car while full gas. If I see that the front goes red (Slipping) and the back is green (Traction) then I move more power to the back. I repeat this until all of the wheels will break loos at the same time with powering through a turn.
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The ultimate goal of the limited slip differential is to prevent all the torque from escaping through the wheel with the least traction. It does this by binding the axles together, through locking the differential, at a preset point. This point is determined by the difference between how fast each wheel is spinning. A higher percent means the differential is more sensitive to the difference between how fast each wheel is spinning, causing the diff to lock faster. If you set the percent to low it won’t lock at all, and if you set to high it will lock to fast making it more difficult to rotate. Set your diff higher in the front will also make the steering heavier and less percise
Generally you will want find the right balance between percent the power from escaping, improving traction and stability, and allowing the vehicle to rotate. Also note that a higher percentage is going to result in more oversteer, or drifting, when you break traction, although it is usually more difficult to break traction with a higher setting. If power is escaping or the vehicle isn’t rotating enough or too much, ei. Understeer and Oversteer, the controller will start to vibrate, so aim for less vibration and more smoothness. Keep in mind that because your front wheels need to spin faster its better to use a lower percentage then you would on the rear, I generally recommend leaving the front deacceleration setting at 0
For the torque split the more torque you can send to the back without breaking traction the better.
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Thanks that really helps me visualise what the differential does and how to tune it.
By higher what do you mean in relation to the sliders in Forza?
I find I have more precise control over the car when the accel diff slider (front) is further right. If I go too far then the wheels will spin and lose grip but in Horizon 2 that almost never happens.
For decel I find far left is better in this regard.
Beyond a certain point continuing to set higher in percentage, or more to right, will make the steering heavier and less precise. Although at the same if you set the % too far to the left you will lose a lot of precision due to wheel slip. Ideally what you want to is to set it as far right as you can without there being a lot of vibration powering out of a corner. Too far right can result in the diff over driving the inside wheel because the diff is spending so much time trying to match it to the speed of the outside wheel, causing mild understeer.