Private League Derivative for TTM at THR
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Engine:
- Type: HSV Injected V8 (Iron Lion) Group A
- Configuration: 5.0L cross-plane V8 OHV 16V with EFI
- Aspiration: natural with twin throttle manifold by TWR (inspired by Rover SD1)
- Interesting fact: The Peter-Stevens-designed TWR bodykit improved drag and drastically lowered the lift, but did not cancel out all of it.

Pros:
- highest power of all
- very high top speed
- widest tyres (12") of all, on surprisingly light Perkins Dymag 17x11" magnesium rims
- smooth power delivery
- front carbon brakes from TWR's Jaguar Le Mans program

Cons:
- cold brakes are very difficult (steel in rear bites at lower temps than carbon front)
- highest weight & consumption
- only 5 gears
- TWR aero kit designed by Peter Stevens did not cancel out all aerodynamic lift
- rear suspension is an asymmetrically-linked (3-link) live axle
- very high rear unsprung mass
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Changelog v1.7.2 (TTM 2025):
1. car.ini:
- weight reduced by 125 kg to 1325 kg (ATCC)
- installed 120L CAMS endurance tank & increased fuel consumption
2. suspension.ini:
- revised front suspension geometry (angle-induced Y & Z offsets)
- recalculated front & rear hub mass
- rear axle geometry updated
- softer front damper fastbump (2500->1500) hardcoded
- stiffer default front damper bump (11250), softer rebound (2655)
- BASEY updated
3. setup.ini:
- three gearboxes to choose from (Borg Warner BT5G + 2x Holinger GRA-5)
- fuel capacity updated to 120L endurance tank (same location as Group A)
- added alternative gearset from 1990
- front damper bump adjustment MAX raised from 11250 to 15000
- converted all damper setup options to steps
4. 3D model:
- added small left exhaust cutout
- fixed material alpha of lit cockpit switches
5. collider.kn5 updated for better alignment to 3D model
6. colliders.ini updated to match adjusted center of gravity and graphics offset
7. tyres.ini:
- recalculated angular inertia of wheels
- recalculated (lowered) FZ0
- HX tyre: SURFACE_ROLLING_K=0.5641 (Delta 0.03 between compounds)
8. dash_cam.ini: moved dash cam back 2 cm and down 1 cm
9. flames.ini: revised positions to match chassis PE010 single side exhaust
10. analog_instruments.ini: updated fuel gauge for 120L CAMS endurance tank
11. drivetrain.ini:
- differential revised (less coast, more lock)
- new default gearbox Borg Warner BT5G
12. brakes.ini fully reworked
13. engine.ini: limiter raised by 500 rpm (result: 8500 rpm)
14. ext_config.ini:
- fixed interior shading
- new warning lights (fuel, oil pressure, voltage)
- better exhaust smoke (true-to-life)

v1.7.1 (TTM 2024 hotfix): tyres.ini: DY_REF and DX_REF of HX compound corrected

==== Basis ====

1) RJE/Assettomods v1.5 mod: https://assettomods.com/atcc-group-a-pack-v1-5/
2) plus adjustments by ACTK (v1.6) but but only two of his edits remain untouched:
- collider.kn5
- wipers

==== Fundamental Changes for this TTM derivative ====

Physics Changes:

Suspension:
- NEW front STRUT suspension geometry with 3.63° caster
- NEW rear AXLE suspension geometry with 2 lower trailing arms & 1 top right arm (RJE mod had a DWB)
Reference: FIA Homologation & https://www.youtube.com/watch?v=8FTX_KR2su8

Global Data Changes:
- car.ini TOTALMASS=1525 to comply with 75 kg driver + 1450 kg mandate for 5.0L engines in DTM 1992 rulebook (note: we previously tested ATCC 1992 rulebook's 1325 kg but it was too OP with that)
- car.ini Fuel consumption adjusted
- car.ini Fuel tank rescaled to 83L (FIA homologation) and relocated to match PE010 tank location
- analog_instruments.ini fuel gauge rescaled to match updated fuel capacity
- lights.ini revised to use reflectors instead of illuminating a mistakenly opaque glass texture
- colliders.ini adjusted again
- dash_cam.ini adjusted
- flames.ini relocated to match sidepipe exhaust position of chassis PE010 from ATCC 1992 season

Tyre Changes:
- Rim colliders for tyre compression rescaled to 17" diameter (8.5" radius)
- Tyre Names reverted to DTM90s (it was the same tyre model anyway as on the Kunos 190E)
- FZ0 of tyres increased by 33.33% to account for 12 inch wide racing tyres on 11 inch wide wheels as raced in ATCC since late 1990 season (baseline value: FZ0 from 9 inch wheels on 190E and M3)
- Added DTM90s Hard compound tyre
- Developed New DTM90s Extra Hard compound tyre

Engine changes:
- power.lut All-New engine torque curve based on dyno data of a Perkins Engineering Twin Throttle Group A engine with 13% friction loss factored in and extrapolated to the 8800 rpm reported for Perkins's Bathurst shootout lap. Video source: https://www.youtube.com/watch?v=jj6jpZwRay4
- engine.ini revised for higher engine braking torque, higher rev limiter, higher damage threshold (Perkins revved it to 8800 in the 1992 Tooheys 1000 shootout)

Gearbox (drivetrain.ini & final.rto):
- gearbox replaced by Holinger 5-speed gearbox ratios from Group A homologation documents of the VL Commodore SS Group A SV (Extension 27/16V0 on Homologation A-5282)
- final ratios replaced by those from the same homologation package
- differential converted from 100% lock to 30% lock

Setup.ini:
- increased ground clearance adjustment range

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3D Model & LOD Changes:
- headlight glass glasslh_a_SUB1: shader change to KsPerPixelReflection, new texture
- brake discs spun off into separate material, shader change to KsBrakedisc & addition of new Normals, Blur & Glow textures
- new txDamageMask drawn & imported for body
- new txNormals drawn & imported for body
- new txDamage drawn & imported for body
- new txDust drawn & imported for body

Note: Damage & Dust only randomly affect the skirts on the front, side, and rear, because they're assigned to the same damage shader textures but mapped under a different UV map layout.
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All-New CSP Extension Config with following features:
- headlight low/highbeam separation in LOD 0
- turn signals
- reversing lights
- tail & brake light effects with different brightness
- working reflector in tail light assembly
- custom oil pressure calculation & working gauge
- customized exhaust flame behaviour
- light exhaust smoke like on Perkins's 1992 Toohey's 1000 shootout lap
- headlight glass set as photoelastic glass
- deforming hood & rear spoiler in LOD 0
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Skins: renamed defaults, plus:

from "ATCC 5L Touring Car Skins":
https://www.overtake.gg/downloads/1995-bathurst-1000-car-livery-track-skin-pack.56012/
https://www.overtake.gg/downloads/1995-atcc-additional-car-skins-pack.54392/