Hi guys, in the workshop there is a 1993 Alfa Romeo 155 V6 DTM, but the mod car is RWD, not 4WD like the real thing. So I'm messing around with the HDV file of the mod, in order to make it 4WD and eventually share it as an upgrade. The uploader disabled the comments and "forgot" to tell people that his car is RWD. Now, I'm trying the settings copied from the hdv file of the Delta S4 group B car of the RallyWorld RF1 mod. It seems ok, but the front tires are always a bit higher in temp than the rear ones. And there is a bit of understeer. I haven't checked the tire settings of the mod yet, I'm more interested in unerstanding how to give the car the right front/rear torque split throught the hdv file. In game it has only the soft compound. This is the DRIVELINE section of the modified HDV file, with the new lines in bold: [DRIVELINE] // 140mm carbon triple plate clutch EngineTorqueDistrib=(0.98:front_subbody,0.02:rear_subbody) ClutchTorqueDistrib=(0.9:front_subbody,0.1:rear_subbody) GearboxTorqueDistrib=(0.05:front_subbody,0.95:rear_subbody) DifferentialTorqueDistrib=(1:rear_subbody) ClutchInertia=0.01 ClutchTorque=720 ClutchWear=0.0 ClutchFriction=10.6 ClutchEngageRate=1.2 // how quickly clutch is engaged with auto-clutch driving aid AIClutchEngageRate=1.9 BaulkTorque=865 AllowManualOverride=1 // whether to allow manual shift overrides when using auto shifting SemiAutomatic=2 // whether throttle and clutch are operated automatically UpshiftDelay=0.085 // delay in selecting higher gear (low for semi-automatic, higher for manual) UpshiftClutchTime=0.01 // time to ease auto-clutch in AFTER upshift UpshiftLiftThrottle=0.01 // lift to this throttle fraction while upshifting (if controlled by game not player)) DownshiftDelay=0.095 // delay in selecting lower gear (low for semi-automatic, higher for manual) DownshiftClutchTime=0.055 // time to ease auto-clutch in AFTER downshift DownshiftBlipThrottle=0.95 // amount of throttle used to blip if controlled by game (instead of player) WheelDrive=FOUR // which wheels are driven: REAR, FOUR, or FRONT GearFile=155_Gears.ini // Must come before final/reverse/gear settings! AllowGearingChanges=1 // cannot change stock ratios until one buys a tranny upgrade AllowFinalDriveChanges=1 // cannot change stock ratio until one buys a diff upgrade FinalDriveSetting=2 // indexed into GearFile list ReverseSetting=0 ForwardGears=6 Gear1Setting=1 Gear2Setting=9 Gear3Setting=19 Gear4Setting=32 Gear5Setting=43 Gear6Setting=55 DiffPumpTorque=10 // at 100% pump diff setting, the torque redirected per wheelspeed difference in radians/sec (roughly 1.2kph) DiffPumpRange=(0.004,0,1) // differential acting on all driven wheels DiffPumpSetting=0 DiffPowerRange=(0.1,0.05,19) // fraction of power-side input torque transferred through diff DiffPowerSetting=6 DiffCoastRange=(0.1,0.05,19) // fraction of coast-side input torque transferred through diff DiffCoastSetting=8 DiffPreloadRange=(20, 10, 11) // preload torque that must be overcome to have wheelspeed difference DiffPreloadSpecial=(0,20,"Nm",) DiffPreloadSpecial=(1,30,"Nm",) DiffPreloadSpecial=(2,40,"Nm",) DiffPreloadSpecial=(3,50,"Nm",) DiffPreloadSpecial=(4,60,"Nm",) DiffPreloadSpecial=(5,70,"Nm",) DiffPreloadSpecial=(6,80,"Nm",) DiffPreloadSpecial=(7,90,"Nm",) DiffPreloadSpecial=(8,100,"Nm",) DiffPreloadSpecial=(9,110,"Nm",) DiffPreloadSpecial=(10,120,"Nm",) DiffPreloadSetting=3 RearSplitRange=(0.50, 0.01, 15) // Torque split to the rear, defaults to RearSplitSetting=2 // 50:50 if these entries aren't here. Pump4WDEffect=(1.0, 1.0, 1.0) // Effect of various diff settings on Power4WDEffect=(1.0, 1.0, 1.0) // the center diff, then the front diff, Coast4WDEffect=(1.0, 1.0, 1.0) // and then the rear diff. Sorry, no Preload4WDEffect=(1.0, 1.0, 1.0) // separate settings for each diff. In the real car the front/rear torque split seems to be 37%F/67%R. Some source instead says that it is 40%F/60%R. Can someone please tell me how to read the RearSplitRange line settings and how to change them in order to get the torque split described? Same thing for the ReaSplitSetting line. Any other suggestion on what things to adjust when we try to convert a 2WD to 4WD is very welcome.
I found this post in the forum, but I don't seem to find anything else about 4WD cars. Here there is also one more line after the first one, but don't know what it does: I found also this other post: I modified the previous values to this RearSplitRange=(0.60, 0.01, 7) everything else the same. This now should mean that the car starts with a default 60% torque on the rear, that increases to 67% with 7 steps of 1%. Or I think so. The result is good: the car is better than before. Less understeer. The front tires continue to have 5-10°C more than the rear ones also in the long straights, but this could be caused by the different camber. Have to look at that. Great grip by the way.
That's what the available range is, yes. Though that's 60 to 66% rear (7 settings total; if you want to include 67 you need 8 settings). The default setting is what RearSplitSetting will determine. 0 is the first value in the range, so the maximum default is number of settings - 1.
Hey, thanks a lot for the answer. So should be like this? RearSplitRange=(0.60, 0.01, 8) RearSplitSetting=0 for 60% and =7 for 67% ? So if I set the default to 67%, it will keep this torque split always?
Yes on the range settings, and the default means it will be the standard setting when you use that car. You'll be able to adjust it across the entire range in the car setup. If you want it locked just set it to exactly what you want and make the last value 1: (0.67,0,1)
