The CALM All Porsche Trophy regulations 2025

 

Our series is open to ALL Porsches of any age or persuasion.

 

Race format

 

A mixture of sprint, 15 & 40-minute races, plus qualifying, with a mandatory pit stop.

Great value racing – with the ethos of safe and gentlemanly driving standards.

Entries may be by single drivers or two drivers sharing the same car.

 

The CALM All Porsche Trophy Series offers competitors a great deal of freedom in tuning your Porsche whilst at the same time providing a framework that keeps cars competitive and cost effective.

 

The class structure is organised on a maximum bhp (at the wheels – NOT the flywheel) per tonne, including the driver, as follows:

 

Classes

 

SP1 181 – 230 bhp/tonne Blue sticker

SP2 161 - 180 bhp/tonne Red sticker

SP3 131 – 160 bhp/tonne Yellow sticker

SP4 Up to130 bhp/tonne Orange sticker

SP Invitation class Silver sticker

 

Any car not meeting any of the above but deemed a positive entry by the organisers, including fully electric driven cars, meeting the current MSUK regulations.

 

A coloured sticker, as described above, will be provided to identify each class. The stickers must be applied to the front and rear of the car.

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The organisers reserve the right to adjust a competitor's class should lap times dictate. Designated rolling road companies.

 

In order to standardise power figures, one of the following MAHA rolling roads MUST be used and the results returned to the CALM organisers by 31st of March 2025.

 

(Check that the operator has a calibration certificate no older than 12 months before booking):

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Marlin Motor Engineers (Milton Keynes) Unit 4-5 Wellington Place Bletchley Milton Keynes Buckinghamshire MK3 5NA Tel: 01908 366256

 

Revivals (Duxford) Revivals Garage Lodge Road Thriplow, Royston Herts SG8 7RN Tel: 01763 208043

 

750 Motor Club (Mobile Dyno) Donington Park Castle Donington Derbyshire DE74 2RP TSR

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Performance (Bridgwater) 1 Stockmoor Park, Taunton Road, Bridgwater, Somerset, TA6 6LD United Kingdom Tel: 01278 453036

 

Garej Arwyn CYF (Gwynedd) Unit AH, Penygroes, Caernarfon Gwynedd Wales LL54 6DB 01286 882299

 

TI Motorsport (Stoke) TI Motorsport LTD Tegiwa House Sutherland Road ST3 1HZ Tel: 01782 950315

 

Alive Tuning (Louth) Unit 1 & 2 Meridien Centre Belvoir Way Fairfield Industrial Est. Louth Lincolnshire LN11 0LQ Tel: 01472 812900

 

Raceworx Performance Centre (Scotland) Unit 2 Block 1 Hunting Park, Livingston EH54 5QS Tel: 07483 161958

 

Safety

 

All CALM races are run to the regulations published by Motorsport UK (MSUK) and it is the responsibility of all CALM drivers and entrants to make themselves familiar with the relevant rules and regulations published by MSUK.

 

All cars must always carry at least one forward-facing, fully functioning in-cockpit camera when on a live circuit. These must be always switched on during free practice sessions, qualifying and the race. The recording (media) must be surrendered upon demand to the Clerk of the Course and the meeting officials as evidence of any incident. Cameras should be mounted to capture an image that provides a ‘driver’s eye’ view that should include, where possible, the steering wheel, dashboard, and the view of the circuit ahead with a field of vision of approximately 100 degrees, where the centre of that field of view is pointing directly ahead in the direction of travel of the vehicle.

 

Driving Standards / Behaviour

 

All CALM races are strictly non-contact. Any contact incident during an official practice, qualifying or race session will be reviewed and acted upon by the race officials in line with published MSUK rules. The ‘Race with Respect’ code of practice will be adhered to by all drivers / teams and officials on or off the track.         

 

The CALM organisers will also review any contact incidents and may also impose further penalties beyond any imposed by the race officials for persistent offenders and incidents that they deem to be particularly serious. In the most extreme cases,

this could include suspension from the series and/or refusal of entries for future CALM events.

 

Bodywork

 

Limited production splitters, wings and other aero devices may be allowed provided they are approved by the organisers. The devices must, above all, be securely fitted to the car with robust fittings and must not exceed the roofline or width of the car. Any competitor wishing to fit such devices must obtain permission from the organisers before they use

them on track.

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The aftermarket GT3 type fibreglass bumpers are allowed on all Boxsters.

 

Engine and Transmission

 

Original engine and gearbox type to be retained, internals are free, but no sequential gearboxes, unless supplied in original road car. 'Original engine and gearbox type' means the same engine (block and head) and gearbox as was available from the factory in period.

 

If fuel-injected, throttle bodies are allowed, fuel-injected cars may run carburettors but not vice-versa. Fuel injection and carburettor type are free.

 

Suspension & Tyres

 

Cars may run on any treaded tyres in Motorsport UK list 1A/1B/1C. No slick or rain tyres allowed except for the Birkett 6-hour race. Suspension, shock absorbers, springs arms, links, wishbones are free

 

Pit stops

 

A mandatory pit stop is required for all cars during our 40-minute races. This will allow a driver change in two driver teams; solo drivers can remain in their cars. The engine can be kept running during all pitstops. During the stop, each car must be stationary for 60 seconds, each team will be responsible for the timing of their stop. The organisers will use the official timing provided on the day to police the duration of each stop.

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Awards

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Awards are given at each round: - Class winners, 2nd, 3rd of each SP class will receive trophies.

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All cars must display the correct sponsors stickers as supplied by the club upon registration. Any competitor entering the assembly area for qualifying at any of the races not displaying our sponsor’s stickers and in the correct place on their car, will have their qualifying time deleted and must start at the back of the grid for that race.

 

Technical rights of the CALM All Porsche Trophy organisers

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The organisers have the right to overrule any of the above rules, including moving a car between classes and/or treat any applicant individually as seen fit to help promote and to enhance the series, and to protect and respect the position of all existing competitors.

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The organisers welcome all new enquiries but advise all interested parties to contact us before building or purchasing a car so we can help ensure the car is suitable for the series.

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The organisers also reserve the right to re-classify any car from a meeting that does not comply with the series technical regulations or is not prepared to an acceptable standard.

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The organisers reserve the right to amend these regulations at any time in the year.

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Socials

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