Private League Derivative for TTM at THR
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Base car comes from v3.0 of this Original Mod:
https://www.overtake.gg/downloads/ford-sierra-cosworth-rs500-pack.24027/
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TTM version is derived from 2021 THR League Proposal Physics Changes by JackCY
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Updates by THR for TTM 2024 season:

v3.0.2 Bugfix:
- tyres.ini: corrected DY_REF and DX_REF of HX compound

==== Physics (on top of JCY physics) ====
- drivetrain.ini & setup.ini: configured all 4 gearboxes that were Group A homologated for RS500 in Group A competition by F.I.S.A. (5- & 6-speed)
- final.rto: added all 38 final ratios that were Group A homologated by F.I.S.A.
- colliders.ini: new ground collider
- brakes.ini: added brake temperature modelling
- dash_cam.ini: re-positioned to match 190E and M3
- electronics.ini: upgraded ABS to 4-channel specification again to match TTM-spec M3 & 190E
- tyres.ini:
--- added new Extra Hard (HX) tyre compound
--- reverted thermals of S, M & H tyres to Kunos M3 Gr.A92 specification
- ext_config.ini from v3.1 and expanded to add dedicated highbeam headlight emissive, 1 reversing light, and some better dash lights. No rear turn signals because the tail light object to texture mapping makes it impossible to configure

skins:
- original real-life skins by NWRAPGraphics
- added real-life DTM 1988-89 skins by =LM=908GTS:
https://www.overtake.gg/downloads/ford-sierra-cosworth-rs500-skins-pack.32952/

=== Physics basis: 2021 THR Proposal by JackCY ===
DTM regulations added weight and mandated a restricter on the turbo's inlet to reduce horsepower. Much more of a fair match to the E30 M3 and 190E.

Details below:

=== Equal to existing DTMs ===
- ABS_V2 1 channel ABS [revoked in THR TTM update]
- brakes 2500
- cockpit adjustable balance
- handbrake 600

=== Setup ===
- front spring step 20
- no fast dampers adjustment in line with existing DTMs
- damper rate ranges and steps in line with existing DTMs
- older version final drive ratios = better adjustment and top speed
- BRAKE_POWER_MULT available
- both older and newer version gearsets
- ARBs changed to steps in line with existing DTMs
- front and rear adjustable aero

=== Engine ===
combined and adjusted power curves of older and newer version to fit better with found data, 329.5 bhp/424.9 Nm at the wheels, gives power to weight ratio in line with other DTMs now 295.52 rwhp/tonne, power and torque at engine: 378.7 bhp/488.4 Nm.
reworked turbo and turbo drop off
fuel consumption to match other DTMs and expected engine power efficiency

=== Car ===
- found real weights, changed to 1115 kg including driver
- default fast and slow dampers in line with existing DTMs
- aero fixing the scientific notation of numbers
front and rear DTM aero
- bumpstop distances raised in line with existing DTMs
- lower clutch torque for easier starts
- AI shifting
- drivetrain version and extra data
- disabled debug logging
- RPM led blinking enabled

=== Remaining ===
- the RPM analog dial is off, same goes for Ks Alfa

=== Dragstrip 500m ===
13.4s 211 km/h Ford Sierra RS500 1050kg original v303 (way too OP power, aero, brakes, even fuel)
13.6s 207 km/h Alfa 155
13.8s 209 km/h Ford Sierra RS500 1115kg updated (this version with all the changes)
13.9s 208 km/h BMW E30
13.9s 207 km/h Mercedes 190E

=== Performance ===
power/tonne = acceleration, equal to Alfa, higher than E30 and 190E
top speed higher than all stock content DTMs
downforce/weight similar to E30, good weight balance car, a lot of power and top speed but as the real thing it has worse aero than newer DTMs