The new series is open to ALL Porsches of any age or persuasion.
Format & Calendar
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. A mixture of sprint, 20,40 minute and 60 minute races with a mandatory pit stop plus 20 minute qualifying session. Entries may be by single drivers or two drivers sharing the same car. Great value racing – with the ethos of safe and gentlemanly driving standards.
4th April - Silverstone National - 20 min qualifying, 40min race
3rd May - Snetterton - 20min qualifying, 20min race & 40 min race
30th May - 1st June - Zandvoort (ADPCR) 30min qualifying, 3x30min races
27th/28th June - Thruxton - 20min qualifying, 20min race & 40min race
29th August - Brands Hatch GP - 20min qualifying, 40min race
24th October – Silverstone GP (Birkett Six-Hour Relay)
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 - 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 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
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.