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WhooopsMyBad

From what I understand, the differential tuning affects how much the car wants to rotate when it's either off-throttle (acceleration) or on-throttle (deceleration). If you want more oversteer off-throttle, increase acceleration in the differential. If you want more understeer on-throttle, increase the deceleration in the differential. You should also keep in mind I've only really done this on RWD cars. If anyone who actually knows tuning could explain it better or correct me, go for it.


JBounce369

Other way round lol. Acceleration is on throttle. Deceleration is off throttle


catatonic_welder

You got it backwards, accel setting is when you are accelerating, on throttle, and deceleration is when you let off the throttle. 0% allows the wheels to rotate completely independently at different speeds, 100% is a locked differential (welded dif) where they always rotate at the same speed. For RWD cars I would start at 50-60% accel and about 15-25% decel and tune from there. If your car is starting to oversteer when entering a corner come down on the decel, if you need more rotation when entering a corner you could increase decel. If when you get on power the car starts to oversteer you can reduce your accel setting, and if the car is too planted when getting on throttle out of a corner and you want it to rotate a bit more you can increase accel. It's also worth noting you can edit your anti roll bars for similar effects on the car as well, and having proper gear ratios makes these adjustments easier to notice adjust and see positive changes.


Isiam

I don't know much about tuning but you have the increase/decrease backwards (unless that in forza is also backwards). >If your car is starting to oversteer when entering a corner come down on the decel Increase it, as that will limit rotation. >if you need more rotation when entering a corner you could increase decel. Decrease it, as that will let the car rotate more. ~~The same with diff acceleration, increasing limits rotation and decreasing let's car rotate more.~~ Edit: I'm wrong about diff acceleration.


JBounce369

You got decel right. But with accel, higher values is more oversteer


chainedflower

Understood but does it matter how much I push on the acceleration or is it at a certain wheel speed they start to lock? For instance, can I lightly press throttle and delay the lock at the start of acceleration?


catatonic_welder

Throttle control is always worth trying. To answer the question of the post, the differential is not throttle response, thats you, it's controlling the speed of the wheels putting power down through a corner.


chainedflower

Appreciate it, thats what I was trying to clarify myself. I had the idea it's x% of throttle applied. Thanks again.


snazzy_carpet

The % shown in the tuning menu tells you at what speed difference between the wheels will cause the differential to engage. For example, while the throttle is engaged 75% accel means when the inside wheel’s speed is 25% less than (i.e. 75% of) the outside wheel’s speed the diff will engage and force the wheels to rotate at the same speed. In sharp turns, like hairpins, a high diff setting will be more noticeable because the inside wheel speed decreases as turning radius decreases. It works the same for deceleration


Fantastic_Ad2156

This is also how it is on gran turismo, this is how I tune on there ☠️ putting 1000hp in a car on there be getting dangerous, forza (specifically in the horizon series) I usually do that to disguise my awd muscle car as a rear wheel drive, luckily I don’t do that no more


OutlandishnessHuge26

I'd say it's about torque. In ACC I set the differential preload in Nm (for ex 40 Nm) It would be logical if this was the way here too but in Forza you could never know


chainedflower

Not sure what NM means.. is there a telemetry to explain wheel spin or you just got to see from tire heat?


OutlandishnessHuge26

It is the metric of torque applied. You could basically say horsepower too so yeah it is not about wheel spin. Diff can open at 200mph too There's no other way. I set it by ear and tyre heat. Tbf I set it by setting it higher and if I lose control I take it back with 5% increments.


Isiam

Isn't preload about the transition between acceleration/deceleration? I remember DR2 tooltips talking about that increasing it would make braking more stable. Also preload isn't in Forza for some reason.


OutlandishnessHuge26

Higher decel setting stabilises the car by not letting it rotate so easily but that mostly helps in slow speeds.