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2.7 Modifications to car design:
2.7.1 General
The complete car is divided into three types of part.
Type 1: These parts must be supplied by the manufacturer and used exactly as supplied. Repairs may be carried out only by the manufacturer.
Type 2: These parts are Type 1 parts with specific restrictions. Only the modifications indicated in the homologation may be carried out. Repairs are allowed only in the range described in the homologation.
Type 3: These parts are unrestricted, provided that they are used as designed by the manufacturer and do not fulfil any additional function.
The adding of colour or thin adhesive film up to a thickness of 0.5 mm is not considered as a modification, provided that the colour or film fulfils only an optical function.
2.7.2 Standard mounting parts
Standard mounting parts, such as screws, nuts, bolts, washers and lock washers, are considered as Type 3 parts unless specifically mentioned in the homologation. They may be replaced with equivalent or superior standard parts.
The thread type, size, length and pitch must remain the same.
The use of locking wire is permitted.
Any type of standard mounting part which has an influence on the car set-up is considered as a Type 1 part unless specifically mentioned in the homologation.
Only Type 3 washers may be removed.
Washers may be added only for facilitating and improving mechanical installation. They may influence the set-up of the car only when specifically mentioned in the homologation.
2.7.3 Protections
Heat protections, mechanical protections (such as abrasion protection or tape) and protections for driver comfort may be added, provided that their sole function is the protection of the relevant element and unless specifically mentioned in the homologation.
2.7.4 Bodywork
The modification of bodywork parts and bodywork supports is allowed only to ensure proper installation despite manufacturing tolerances.
2.7.5 Quick couplings
The use of quick couplings for brake, clutch and fuel lines is allowed, provided that FIA-approved dry couplings are used.
I'm not sure where Type 1, 2, or 3 is indicated for each part. Clearly you can't touch the bodywork or the wings, the profile of which is specified in the regulations.
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8.5.2 Sensors
The chassis may be equipped with only the following sensors:
- Acceleration (1 3-axial sensor)
- Wheel speeds front axle (2 sensors)
- Steering angle (1 sensor)
- Brake pressure front/rear (2 sensors)
- Lap timer/trigger (1 sensor)
- Gear (1 sensor)
- Throttle pedal or valve (1 sensor) only in case of a mechanical throttle
The dampers are restricted, but I don't see anything that limits how they are valved, or would prevent a team from carrying several sets of dampers (but you can do that now in any comparable series):
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10.7 Suspension damper:
10.7.1 Only conventional hydraulic, single tube dampers with one piston and maximum two-way adjustment are permitted.
10.7.2 Damper fluid may be pressurised.
10.7.3 Damper characteristics may vary only as a function of damper piston speed, created only by suspension movement. Any other variation of damper characteristics, such as those which vary as a function of position, frequency or acceleration, is prohibited.
10.7.4 The use of blow-off valves, inertia valves, external electronic inputs, the storage of energy or any hydraulic connections between dampers is prohibited.
10.7.5 Only one type of damper for front and rear is permitted (except for top eye).
10.7.6 The damper must comply with the following specification:
- Stroke: no less than 40 mm and no more than 50 mm
- Maximum outer diameter: 55 mm
- Compatible with 36 mm ID springs
- Optional external canister with max. 170 mm length and 50 mm diameter
- Fully extended length between pickup points 310 mm
- Bolt diameter of fixation points 8 mm or 5/16"
10.7.7 The use of any kind of bump stop is prohibited.
I don't really see room for any sort of suspension development given that all the suspension parts must be as supplied and there is minimum weights for many of them (including complete upright assembly and wheels). I guess you can adjust geometry within defined limits, camber, caster, toe, etc, as well as wing angles (maybe?) and ride heights.