So I just got into tuning and I’m getting the basics down. One problem I have is running a high powered car with no tcs. I don’t use any assists and would like to keep it that way. I read lowering your acceleration differential will improve stability and limit wheel slip.
It works great but are there and adverse effects? Is lowering it too much a bad thing or should I try to find a sweet spot?. I usually put it around 40%
When lowering it to much it will have bad results… easiest way to tell if its to low is when you hit the gas and only one tire spins. Thats means ur losing accel because only one tire is trying to get ur car out of the corner… keep raising it until both tires smoke. Then you gotta get ur throttle control better so you can keep ur tcs off and not go sideways on exit.
Btw 40% is a good accel number for me and thats where i set my base number… some go higher or lower after driving buts thats about where i start.
I usually am around 70%
There can be too little or too much but my thought on it is that there is a threshold for each car. There are 2 main components to FM differential setting and T10 has decided to marry these 2 into one (1) set-up parameter. Those 2 are: amount of slip, and amount of pressure. Amount of slip refers to the inside-outside wheel rotation difference BEFORE the differential LOCKS. Amount of pressure refers to how QUICK the differential LOCKS.
0% = fully open, no lock (my daily driver)
30% = engages only at big high-speed corners, slow action (slow engagement makes driving easier but may lose traction out of slow corners)
70% = engages pretty much at all corners, fast action (will tend to push at high speeds, oversteer at low speeds)
100% = fully closed, locked at all times (great for drifting, but hard on car reliability)
0% --------- LOW - GOOD - HIGH ------------- 100%
Going lower than LOW will feel the same, no matter the setting. Same with going higher that HIGH.
High setting has the tendency to UNDERSTEER if driven carefully because the locked differential will tend to push the car straight forward. If driven hard, then the locked differential will force the rear end to lose traction and cause slip, i.e. OVERSTEER.
The correct setting is the level that allows the driver to understeer or oversteer with throttle input. This depends very much on power, track width, wheelbase, tire size/choice, track, etc. Therefore the best way to tune for accel diff. is to test drive but NOT driving hard but at comfortable pace (about 1~2 seconds slower). If the car is accelerating from apex well but seem to catch power towards the exit, then the setting is too low. if the rear end wants to come around easily, then the setting is probably too high. In a high powered car, the rear end will come around no matter the setting if throttle application is too aggressive.
So bottom line = low is OK as long as you have good throttle control. Loss of laptime will be really inconsequential unless the tires are at the traction limit at all times. My general rule is low power = low setting, high power = high setting.
well written grd
Only thing is i would say i do the opposite of the last paragraph. High power car i tend to have a lower diff setting and the less powerful the car the higher you can get away with as wheelspin is less of a factor, so oversteer wont bite you too much.
Thanks for the advice guys. I’ll mess around with it a bit
Leave diff at default 70/35, if you are getting under/oversteer you better off looking somewhere else - it’s not the diff.
Corner entry/exit - springs, dampers
Mid corner - springs, ARBs
Change diff at the very last for that last extra turn-in tuning, I often end up in the range 34/68 or 35/68.
If you are getting too much wheel spin or on-throttle oversteer with the 70 accel setting you need to soften rear dampers/ARBs/springs.
It’s the difference between torque and power. Power from engine goes thou driveline to diff/torque. Divide torque into power that’s your setting. Your decel is the opposite to equal 100. Ex. After dividing ur answer is 65. Then your decel is 35.
Diffs don’t work in Forza like they do in real life, but here’s all you need to know about Forza diffs if that’s what you’re going to change to achieve a desired effect:
Off throttle understeer? Drop the decel.
Off throttle oversteer? Raise the decel.
On throttle understeer? Raise the accel.
On throttle oversteer? Drop the accel.
Exactly.