Private League Derivative for TTM at THR
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Engine:
- Type: Cosworth YBD
- Configuration: 2.0L inline-4 DOHC 16V with EFI
- Aspiration: Garrett T4 turbocharger (limited to 2.0 bar)
- Interesting fact: DJR Sierras had up to 680 hp with 2.4 bar in ATCC 1992

Pros:
- brutal acceleration once the boost comes on
- very high top speed
- optional 6-speed Holinger gearbox (introduced in ATCC mid-1991)
- high rear downforce
- very powerful brakes (might fade)

Cons:
- enormous turbo lag
- boost comes on like a light switch
- narrow tyres are overwhelmed by the engine
- high weight
- heavily rear-biased downforce (not adjustable)
- no ABS

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Credits:
- Base Car, DTM skins by J.Leman, Akina Style (v3.0)
- Sound by Bitto69 (v0.8)
- TTM basis: JackCY (2021 THR League Proposal Physics)
- TTM edits: Valentin K

Links:
https://www.overtake.gg/downloads/ford-sierra-cosworth-rs500-pack.24027/
https://www.overtake.gg/downloads/ford-sierra-rs500-gra-rally.50770/
https://www.overtake.gg/downloads/ford-sierra-cosworth-rs500-skins-pack.32952/
https://www.overtake.gg/downloads/ford-sierra-rs500-gra-rally.50770/
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v3.1 updates for THR TTM 2025 season:
1) engine/turbo: brandnew engine designed in Automation
2) sound: new sound by Bitto69
3) collider.kn5: new
4) electronics.ini: removed ABS, traction control & electronic differential lock
5) car.ini:
- weight 1210 kg + driver (2.0L x 1.7 turbo x 1.0 for 4-valve head = 3500cc group)
- fuel tank upsized to 120L endurance spec and repositioned to match real life
- fuel consumption recalibrated to match new engine
- driver eyes repositioned
- graphical offset adjusted by Y -0.02 to make the car appear lower
6) setup.ini:
- aero adjustments removed for greater accuracy
- increased rear axle ground clearance adjustment range
7) Aerodynamics
- aero front: rebuilt with repositioned and resized wing span
- aero rear: rebuilt with repositioned and resized wing span
8) tyres:
- fully rebuilt based on BMW M3 properties
- grip for all TTM92 tyre compounds increased by 2.7-2.8% compared to 2024
9) flames.ini: updated exhaust flame
10) cameras.ini: new F6 cameras (Onboard TV angles)
11) drivetrain.ini: gearbox properties harmonized to common standard
12) brakes.ini fully reworked
13) recalculated angular inertia of wheels, and recalculated unsprung hub mass
14) ext_config.ini:
- added smoke
- added turbo indicator lamp, shift light, oil pressure warning light, highbeam indicator
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v3.0.1 Bugfix: tyres.ini: corrected DY_REF and DX_REF of HX compound
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==== 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/