To TheJohnbags
I don't know your setup in the car but when u describe rear letting go(aka car is oversteering) when lifting the throttle then this can happen because of car setup. If u are using stock setup is just same thing for every single gravel location, irl drivers do not use same setup in NZ(if they would drive there) and in Greece and in Latvia. It's always slightly different to suite roads and conditions etc (they do testing before events to get setup right).
In Differential setup there's preloads Front and Rear options (it can be also other things in setup that causes oversteer but these preloads are ones specifically for throttle lift-off handling)
examples:
1. if preloads are set F 60.00 and R 60.00 handling can be quite balanced on throttle lift-offs.
2. If preloads are set F 60.00 and R 100.00 handling can be quite oversteering(+unstable) on throttle lift-offs.
3. If preloads are set F 60.00 and R 30.00 handling can be very understeering(but stable) on throttle lift-offs.
Overall higher preloads increase amount engine brake -> slowing down effect is stronger when lifting the throttle.
My Front preload value 60.00 is based on average speed of the unique roads(long stages on dry both ways ) in location which is over 125km/h (77.7mph) in NZ with Rally1 Hybrid class cars.
(my calculation formula: 125kph divided with 200kph = 0.625 -> so front preload 60.00 for starters, for fastest gravel location Latvia -> front preload 70.00-75.00, for slower gravel locations like Mexico+Greece -> front preload starting with 40.00 or even just 30.00)
Like if wanting less engine brake you set front preload lower like 30.00 and then u set Rear Preload value to suitable strength (like 0.00-100.00) based on how much throttle lift-off oversteer/turning u want/need. Every car is an individual so rear preload can need to be different than in some other car to have same effect to handling.
Starting Oceania setup for Rally1 Hybrid Puma 2024 could be like this:
- Alignment: Front toe 0.00 (or +0.10 <-> +0.50), camber -1.50 / Rear toe 0.00 (or +0.10 <-> +0.50), camber -1.25 (or -1.00 <-> -1.50)
- Brakes: Force 3000 (or 3300-2400), Bias 67% (or 55-75% whatever works best when testing), Handbrake max right
- Differential: Front driv 30%, brak 25% (or 20%), preload 60.00 (or 50.00) / Rear driv 35-40%, brak 30% (or 20-35%, preload 70.00 (or 40.00-100.00)
- Gears: top speed with 1st gear on flat road 70-80km/h (43-50mph) and top speed on 5th gear minimum 200km/h (124.3mph) or more 210km/h (130.6mph), mid gears 2-4 with slightly increasing gaps
- Damping: Front Slow +1, Fast +2 (or +3), Div 0.65mps (or 0.52-0.26mps), Rebound +0 (or +1) and same values to Rear damping
- Springs: Front rh lowest/middle/highest, spr 88, arb 10 (or 0<->20) / Rear rh (same as in front), spr 88-80, arb 15 (or 0<->40 etc) <- adjust rear arb (+front arb) if need [overall higher arbs reduce lateral bodyroll -> increasing stability, but this can reduce cornering grip]
