The CALM All Porsche Trophy regulations 2020.
The new series is open to ALL Porsches of any age or persuasion.

A mixture of 20-, 40- and 60-minute races with a mandatory pit stop plus 20 minute qualifying session.
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 is designed to offer 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 will be organised on a bhp (at flywheel) per tonne, including the driver, basis as follows:

SP1: 240 bhp/tonne 
SP2: 200 bhp/tonne 
SP3: 180 bhp/tonne 
SP4: 145 bhp/tonne 
SPDA: Cars previously running in the Supersport Boxster Porsche Racing Drivers Championship
INVITATION CLASS: Any car not meeting any of the above but deemed a positive entry by the organisers
Proof of power and weight must be lodged with the organisers before an entry can be accepted.
The organisers reserve the right to adjust a competitor’s class should lap times in qualifying dictate.

All cars must carry forward facing in cockpit cameras and must be switched on at all times when on track, even in qualifying. The SD card must be surrendered upon demand to the stewards of the meeting as evidence of any incident.

The original silhouette is, largely, to be retained from all angles, with the exception of limited production splitters, wings in the SPDA class.

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 must run on either MRF ZTR, Dunlop Direzza, Toyo R888-R treaded tyres all in Motorsport UK list 1A/1B/1C. No slick tyres are allowed.
It is the intention of the race organisers to use the most successful tyre type as the ‘control’ tyre from 2021 season.
Suspension, shock absorbers, springs, arms, links, wishbones are free.

Pit stops
A mandatory pit stop is required during the 40 minute or 60 minute races. The duration of the pitstop will be adjusted according to each individual car’s lap time during qualification providing the time is at least as quick as a a ‘datum’ time provided by the organisers before qualification. The minimum length of the pitstop will be 60 seconds.

Awards are given at each round: Class winners, 2nd, 3rd of each SP class will receive a unique trophy. 
All cars must display the correct club stickers as supplied by the club upon registration otherwise they may not be eligible for awards.
Technical rights of the CALM All Porsche Trophy organisers. 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.

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.