The CALM All Porsche Trophy regulations 2026

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

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Race format

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A mixture of sprint, 15, 20 & 40-minute races plus 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.

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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. 

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

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Classes

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Blue sticker SP1 181 – 230 bhp/tonne open to 911 & Cayman including PDK gearboxes with original ECU and gearbox management 

 

Red sticker SP2 161 - 180 bhp/tonne Boxsters & early 911s

 

Yellow sticker  SP3 131 – 160 bhp/tonne 944 & 968 transaxle cars only

 

Orange sticker  SP4 Up to130 bhp/tonne 924 transaxle cars

 

Silver sticker  SP Invitation class   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   

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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.

 

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

 

The series organisers reserve the right for entrants to be weighed at any event and for up to date power runs to be provided at any time during the season.

 

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 2026.

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All power figures submitted in the 2025 season may be carried over to the 2026 season. However, CAP reserves the right to request a new power run if required. 

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Failure to comply will exclude the car and driver from the results, therefore no trophies will be awarded for a podium finish. 

(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 

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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 

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

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

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

Safety

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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.

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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 120 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.  Please ensure that any contact is reported to a member of the CAP team immediately after the race.

 

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.

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Bodywork

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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.

The after market GT3 type fibreglass bumpers are allowed on all Boxsters.

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Engine and Transmission

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Original engine and gearbox type to be retained, internals are free, but no sequential  gearboxes, unless supplied in the original road car. Cars fitted with PDK gearboxes must retain the original management systems.

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'Original engine and gearbox type' means the same engine (block and head) and gearbox as was available from the factory in period.

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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

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Cars may run on any treaded tyres in Motorsport UK list 1A/1B/1C. No slick or racing rain tyres allowed except for the Birkett 6-hour race.

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Road tyres, however may be used as rain tyres.

 

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.

 

Awards

 

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

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.

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