First, Please test the game using a steering wheel, especially when you’re modifying some code related to it, there are some other wheel bugs that have existed since the game release too.
Related to: H-Shifter input handling, Launch Control logic, Clutch override at the race start.
When does it happen: Race start.
What’s the possible cause: Bad clutch override at the start of the race. Override it properly and the problem is solved.
Issue description (brief): When starting a race, no matter if Launch Control is on or off, also no matter whether the shifting is set to Manual or Manual with Clutch, having my (G920) H-shifter in 1st gear is enough for the car to stall on launch in the race. Using Manual (without clutch) setting and putting the H-shifter device in neutral (=> no shifter input to the game) makes the car launch properly.
So Manual with Clutch => doesn’t launch properly.
Manual (or auto?) with H-Shifter device in gear => doesn’t launch properly.
Manual (or auto?) with no H-Shifter or it in neutral sending no input => launches properly.
Possible solution: Right now, the game ignores clutch input for the first couple of seconds in a race, which is understandable with LC. You can make the clutch override act like auto clutch control so that the car doesn’t stall on launch and that would pretty much fix the issue.
How to reproduce and test: Try doing the first seasonal eventlab event of the second week of the night series with the rally Audio Quattro, the one with the rally livery and body etc., try with <anual with Clutch difficulty, holding clutch does nothing at the race start (probably because of LC implementation) but the game doesn’t manage the clutch properly so the car launches really slowly without revving at the start / launches at idle, not good. Also try with Manual/Auto shifting with your H-shifter device in neutral, it’ll be a normal good launch this time, as expected.
Why even race with H-Shifter: For me, sometimes it’s more fun and more authentic in some slower cars (though if the ffb worked as expected, without the huge load ffb update interval that have existed for many months, but that’s another issue, a more urgent issue that you must read before this one).
I haven’t tested it without using the H-Shifter, but who shifts manually without the H-Shifter anyway? It has to work correctly.