Open to all Porsches of any age or persuasion, the CALM All Porsche Trophy Series is designed to offer competitors a great deal of freedom of specification whilst providing a framework that keeps racing close and cost effective. An ethos of safe and gentlemanly driving standards is paramount and all profits are donated towards the charity CALM.

Classes & Format

Organised on a power to weight basis, including the driver. A mixture of 15 and 40 minute races (40 minute with a mandatory pit stop) plus 20 minute qualifying session. Entries may be by single drivers or two drivers sharing the same car.

SP1 – 181-230 bhp/tonne (Blue Sticker)
SP2 – 161-180 bhp/tonne (Red Sticker)
SP3 – 131-160 bhp/tonne (Yellow Sticker)
SP4 – Up to 130 bhp/tonne (Orange Sticker)
INVITATION – Any car not meeting any of the above but deemed a positive entry by the organisers (Silver sticker)

Body & Chassis

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

Engine & Transmission

Original engine and gearbox type to be retained, internals are free, but no sequential gearboxes, unless supplied in original road car. 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

Suspension, dampers, springs arms, links and wishbones are free. Cars must run on any Motorsport UK list 1A/1B/1C tyre (no slicks).

Pit Stops

A mandatory 60-second pit stop is required during 40 minute races. The pitstop duration may be adjusted according to each individual car’s lap time during qualification providing the time is at least as quick as a a ‘datum’ provided by the organisers.

Contacts

For more information on the CALM All Porsche Trophy, contact Philip Waters: 07974 034654
For general queries, contact: 750 Motor Club

Competitor Links & Downloads

CALM All Porsche Facebook Drivers’ Group
Mandatory Decal Booklet
Full 750MC 2025 Grid Calendar