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B-SpecUK Technical Regulations

B-Spec UK



1.1 Introduction

1.1.1 The following Technical Regulations are set out in accordance with the Motorsport UK specified format and it should be clearly understood that if the following texts do not specify what modifications or upgrades can be made to the car, then the principle is that alternatives will not be permitted.

The fact that some modifications are specifically mentioned as prohibited does not imply that others are allowed. If any doubt exists about the legality or acceptability of any modifications then clarification from the Eligibility Scrutineer or nominated 2RacingUK person, prior to any work being undertaken must be sought.

Where a technical issue is disputed, the decision of the Championship Organisers shall be final. This includes their acceptance or otherwise to allow participation in the Championship races. Should a competitor be concerned that their car, or any part fitted to their car may not fully comply with any specific technical regulation, it is the responsibility of the competitor to contact the Championship Organisers to discuss these concerns prior to placing a race entry.


For the avoidance of any doubt, it should be fully understood that if the following texts do not clearly specify that you can do it, you must always work on the principle that you cannot.



The phrase ‘standard part’ or ‘OEM’ used within these technical regulations as a description of components is to be interpreted as per ‘Standard Part’.


Checking will be any means necessary to establish compliance. Motorsport UK definition (Section B – Nomenclature and definitions). Standard Part: “Is a part, the specification, features; location and method of operation of a part are as supplied when new by the motor manufacturer for the model and date of car as shown on the entry form.”



The phrase ‘standard pattern’ used within these technical regulations, as a description of components is to be interpreted as per ‘Standard Pattern Part’. Checking will be by any means necessary to establish compliance.


Motorsport UK definition (Section B – Nomenclature and Definitions) Standard Pattern Part “A replacement part that has a similar form shape and features as the standard part and is made using similar materials and manufacturing processes e.g. A standard part manufactured by a non-original equipment supplier that is fully interchangeable with the standard part.”


1.2 General Description.

The B-SpecUK series by 2RacingUK is for competitors participating in standard production right-hand drive versions of B Segment (Subcompact) cars with petrol engines of up to 1500cc of natural aspiration. The B-SpecUK series is NOT a development formula, and all aspects of cars being raced must remain as standard unless specifically detailed otherwise within these regulations


1.2.1 Examination of Vehicles

The Eligibility Scrutineer (in addition to any other powers held under these Regulations) reserves the right before or after any qualifying session or race in the series to designate any one or more of the competing cars for special eligibility scrutineering.


Competitors must be prepared, with tools and spare parts as necessary, to enable dismantling, removal and inspection of components, or to have any component(s) sealed at the circuit for later inspection by an Eligibility Scrutineer at the competitor’s expense.


Upon such election being made the competitor shall immediately place the car under the control of the Championship Coordinator and be deemed to have permitted all such scrutineering, examination and testing as the organisers may responsibly request.


The Eligibility Scrutineer and any person appointed by them has the right to:

a. Examine any aspect of the car at the circuit for such period as they may reasonably require and take fuel and/or other samples

b. Retain the car for detailed examination at premises chosen by the Championship Coordinator. If the Eligibility Scrutineer elects to retain the car they shall make it available for collection by the competitor at least seven days prior to the qualification session for the next race in the Championship unless the car is found to be in breach of these regulations

c. Seal the car and any of its components in any such manner as chosen and require the competitor at their own expense to present the car at any other premises chosen by the organisers for detailed examination within any agreed period and/or remove the car by transporter at no expense to the competitor to an appointed location. The competitor will be notified of the time, date and location of the subsequent testing or eligibility examination.

d. The overseen stripping of the engine or any required component will be undertaken by the competitor and/or mechanic/technician nominated by the competitor.

e. The scrutineer may at their discretion request the removal of any part for further inspection and testing.


If the scrutineer decides to retain any part for further inspection over a race weekend, a fully eligible replacement part will be provided by the scrutineer at the time of removal, allowing the competitor to continue racing.


A refusal to comply with the request(s) of the championship co-ordinator or eligibility scrutineer may place the competitor liable to disqualification from any of the following:

a) a single race,


b) all races taking place on the event,


c) all races from the point at which a scrutineers seal had been fitted, or


d) the championship in its entirety for the season in which the refusal takes place.


1.2.2 For the purposes of postseason scrutineering, at any time the Eligibility Scrutineer may seal any car and any of its components in any manner he/she chooses, and require that the competitor at their own expense present the car at any other premises chosen by the organisers for detailed postseason examination. The competitor will be notified of the time, date and location chosen for this examination.


1.3 Safety Requirements


The following Articles of Motorsport UK Section K Safety Criteria Regulations will apply:

K drawings 1-6 with compulsory ‘side-entry’ bar on both the driver and passenger side of the car; K5, K6, K8 - K11, K13 - K14. Extinguishers must be plumbed-in and comply with Motorsport UK regulation K 3.1.2


a). Seat belts must be FIA homologated as per K2.1.2, K2.1.3 or K2.1.4.


All participants must ensure their entered vehicles are fitted with Roll over protection meeting the design, manufacture and installation of the Motorsport UK blue book. ROP systems can be subjected to thorough inspection by recognised professionals and series personel to ensure compliance.


1.4 General Technical Requirements and Exceptions

All cars must comply with the requirements of sections J and Q13 of the current Motorsport UK Yearbook. All vehicles must be of sound construction and mechanical condition and be well maintained. There is no requirement for an MOT Certificate, Road Tax or Insurance although this is preferable.


The Championship Coordinator in conjunction with the Organisers reserves the right to refuse or cancel the entry of any car of which in their opinion the preparation is not to a standard expected by the Championship, (including the external appearance) and/or which may be considered to bring the series into disrepute.


Any car which has suffered panel damage at a previous race meeting may be inspected by the Championship Co-ordinator or their representatives at the subsequent race meeting to ensure that the external appearance is to a standard expected by the series.


1.5 Chassis

1.5.1 No chassis or bodyshell modification or stiffening is permitted except that derived from the fitting of the ROPS as recommended by the roll cage manufacturer.


Modification of roll cages from the manufacturer’s specification in any way is prohibited. The addition of any form of chassis or body shell bracing or strengthening is prohibited. Unless for the sole purpose of effecting a localised repair to an area of damage, seam welding, stitch welding or the addition of any welds to any part of the bodyshell is prohibited.


No modifications or alterations to the front subframe or rear axle beam, or to their mounting points are permitted, and these must remain fitted in their original positions and in the standard manner.


1.5.2 All race cars must be equipped with front and rear towing eyes. They must be clearly visible, marked with an arrow and the word “tow” and be clearly identifiable by means of a brightly coloured coating and pull cord or tab. The towing eyes must be made of at least 6mm diameter steel wire rope with a 6x19 wire core, each of which must have a breaking strain of at least 2 tons. Each towing eye must allow the passage of a cylinder with a diameter of 60 mm, situated 25mm forward of the adjacent bodywork - 100 mm above and below this hole must retain clearance to enable the recovery crews to attach straps and shackles.


The towing eye must be securely fixed to a structural part of the chassis, the inner part must be flexible in order for the towing eye to be retracted inside the bodywork profile. A “pullcord” must be attached to the towing eye to enable the marshals to access the wire loop. The end attached to the chassis may be either ‘thimble’ or ‘open-loop’ style. Each complete towing eye must be certified as meeting this load requirement.


1.6 Bodywork

1.6.1 Modifications Permitted: Drilling of holes is permitted to allow the addition of small external bracing plates or ties between the edges of the bumpers and metal bodywork for the sole purpose of securing the bumpers.


It is permitted to roll the inner edges of the front wings to increase tyre clearance, however, no metal may be removed, and the general shape of the wheel arch cannot be altered. General:

The external styling alterations are permitted in decal form only and must not change the original factory specification silhouette. Interior: Excluding the dashboard, centre console, window winders, dash top speaker covers and steering column cowlings which must all remain intact and correctly fitted, all other interior trim and fittings may be removed.


It is permitted to neatly trim the ends of the dashboard to allow fitment of the roll cage.


It is permitted to remove and/or blank off the circular dashboard air vents, however, the heating and windscreen demisting system in terms of fitment and operation must remain complete and operational as standard.


The radio / CD and speakers may be removed.


It is mandatory that the OEM door cards remain in place.


All door window mechanisms whether manual or electric must remain fitted inside the doors. The driver’s window must remain fully operational at all times. It is highly recommended that safety film be applied to the inner surfaces of all side windows and the tailgate glass.


A driver’s seat compliant with FIA 8855-1999 as a minimum, must be fitted. Adjustable seat rails may be fitted; however, they must comply with MSUK Regulation K.2.2.1 At least one centrally mounted interior rear-view mirror must be fitted. It is highly recommended that the standard rear-view mirror be replaced by a wide-angle version.


The original dash binnacle and instrument cluster must remain fitted in the original position.


Spare wheel & associated parts, and all tools must be removed.


Any glass sunroof must be removed or replaced as per Motorsport UK regulation Q19.14.6.


The fuel pump cover located in the rear passenger compartment must remain fitted and securely sealed to the vehicle floor.


Excluding the roll cage. No additional interior bracing may be fitted. Exterior:

All windows and glass must remain standard for the variant they are fitted to.


Standard door mirrors must be fitted by their original means to either side of the car in their original housings and positions.


All headlights must remain standard for the variant of car they are fitted to.


Fog lights may be removed for venting or replaced with blanking.


The driver and passenger doors must remain fitted with their original latch mechanisms; however, doors must remain unlocked at all times whilst cars are on circuit. If cars are fitted with central locking, this must be disabled at all times whilst the car is on circuit.


The rear tailgate hatch must be openable by the use of external securing pins or latches


The bonnet opening pull cable must be disabled and can be removed, The bonnet must be secured by way of two locking pins or straps conforming to MSUK regulation Q13.2.6.


It is permitted to minimally trim the scuttle panel directly above the front strut tops, this is to allow ease of suspension adjustment.

All front grille inserts must remain fitted within the front bumper. OEM plastic can be substituted with mesh.

Rear number plate lamps may be removed.

It is permitted to remove plastic wheel arch liners and all related fittings. It is also permitted to cut and reduce the wheel arch liners for partial fitment and to allow ducting to the brakes;


It is permitted to remove the roof rain channel plastic insert strips.


The use of tape to bridge gaps between panels is not permitted.


The roof aerial may be removed.  Silhouette

The frontal, side and rear silhouette SHALL NOT be altered


Ground Clearance / Ride Height Minimum ground clearance / ride height is 50mm, which will be measured from the points shown on the front subframe (as per image 1).


The ground clearance / ride height will be measured whilst the car is in normal racing trim with the driver (in full racing kit) seated normally in the car and steering in straight-ahead position.


Scrutineers may use a gauge of 55mm before or after races or practice to check the ground clearance; the vehicle may be stationary or moving during any testing.


There is no minus tolerance to this measurement. (1)


1.6.2 Modifications Prohibited

Other than minimal localised drilling and cutting to aid fitting of the ROPS, safety pull cables and fire extinguisher system, it is not permitted to remove any fixed metal from the bodyshell whether structural or otherwise bar the isofix loops.


It is not permitted to remove any metal from the doors or bonnet (other than drillings to enable fitment of bonnet securing pins). It is not permitted to remove, modify or lighten the front or rear bumper crash bar metal structures.


1.7 Engine

1.7.1 The only permitted engine is the standard OEM 4 cylinder of up to 1500cc petrol in natural aspirated form. Permitted Modifications:

Two engine cam cover bolts and one-timing cover bolt (bolt locations as shown in image 2) must be cross-drilled through their heads with a hole of minimum 1.5mm diameter. Two front / left sump bolts (as shown in image 3) must also be cross-drilled in the same manner. This is to allow the scrutineer’s locking wire to be accepted. Should these bolts be fitted in a position or manner that does not allow this, the scrutineer may instruct the competitor to reposition them to the scrutineer’s chosen position.

The Throttle body may be replaced with an item from the same manufacture. It is permitted to remap the engine ECU.

The intake and filter may be modified.


1.7.2  Prohibited Modifications No engine modifications whatsoever are permitted, and for the avoidance of any doubt, this means no skimming of cylinder heads, no refacing of blocks, no lightening, polishing, balancing, superfinishing or otherwise modifying any part from its standard factory specification.


Camshafts, crankshafts, pistons, oil pumps, timing gear, pulleys, flywheels, clutches (must remain either OEM or OEM grade), gaskets must all remain as OEM / standard with absolutely no modifications permitted. Any part of any engine or gearbox may at any time be sealed by the Eligibility Scrutineer (or their chosen deputy). Where fitted, and as of that instant those seals will be considered as a mandatory part of the scrutineering requirement for that vehicle, including at subsequent events in the Championship. The validity of any seal sanctioned by the Eligibility Scrutineer at any event, or until removal by the Eligibility Scrutineer will remain effective for the entirety of that Championship season, including for the purposes of post season scrutineering inspections and posting of final championship standings.


Submission of a previously sealed component at a subsequent scrutineering inspection of the 2024 series displaying broken or omitted seals, will be in breach of Scrutineering requirements and as such liable to the penalties outlined in C3.1.1 , C3.5.1 and C3.5.2. in the current Motorsport UK ‘Year Book’ Should a previously sealed component be replaced by another component then the following will apply:


a. The use of the replacement component shall be at the discretion of the Eligibility Scrutineer, and only with prior permission.


b. The previously sealed component must be inspected by the Eligibility Scrutineer and proven to be compliant with the regulations.


c. Failure of either of the above will entail implementation of the penalties outlined in C3.1.1, C3.5.1 and C3.5.2.


The replacement component may be sealed. Location Engine location and engine mountings must remain in standard form. Uprated bushes may be used.


1.7.4 Engine Oil System Engine oil type and specification is free. A standard or standard pattern part engine oil filter must be fitted in its original position, and no modifications, additions or alterations to the engine oil system are permitted. Water / Cooling The entire engine cooling system must remain completely as standard OEM in terms of its fitment and operation. A standard or standard pattern part water pump must be fitted. The water radiator in terms of dimensions, fitment and operation must be a standard or standard pattern part, and no aftermarket alloy or race items are permitted.


Coolant hose dimensions, routing, positioning and operation must remain as standard. It is permitted to replace rubber hoses with silicon type hoses, however internal hose diameters must remain as standard OEM, and routing of hoses must at all times follow the path of the standard hoses. It is permitted to remove all mechanical parts related to the air conditioning system if fitted.


1.7.5 Induction Systems The intake system is free to modify. The choice of filter is free It is permitted to cut/trim one section of the front grille to allow neat fitment of the air intake duct / funnel, however the air intake duct / funnel must not protrude forward of the grille. The remaining areas of all standard bumper grilles must remain intact and fitted. It is strictly prohibited to cut or reshape any part of the external face of the bumper, (excluding as required to comply with 5.5.2.)


1.7.6 Exhaust Systems The exhaust system must comply with Motorsport UK silencing regulations J 5.16, J 5.17 and J 5.18. The rear silencer must be fitted but is of free design. .


1.7.7 Ignition Systems All physical and operational aspects of the ignition system must remain as standard but may be replaced with uprated parts of the same design, this to include spark plugs, HT leads, coil packs, all related wiring sensors and connections. The standard ECU must remain as OEM with regard to fitment (it is permissible to invert the ECU next to the standard battery if fitted) and operation, mapping of the ecu is permitted. The organisers retain the right to request removal of any ECU at any time for compliance testing or comparison.


1.7.8 Fuel Delivery Systems The complete OEM fuel and fuel delivery system including fuel tank must remain in take and of OEM standard specification, An unlocked fuel cap must be fitted at all times whilst the car is on circuit.


1.8 Suspension

1.8.1 Permitted Modifications The Standard suspension may be upgraded to coilovers. The choice of coilover kit is free. It is permitted to alter rear wheel geometry by the fitment of shims or washers between the rear hub bearing carrier and rear axle crossmember. Standard bolts must be fitted in all mounting holes, with one bolt on each side of the car having no additional shims or washers fitted. It is strictly prohibited to modify, reshape or bend of any part of the rear axle structure, the hubs or mounting points. The choice of bushings is free although SuperPro are highly recommended.


1.8.2 Prohibited Modifications It is strictly prohibited to modify, reshape or bend any part of the front subframe or rear axle structure, front wishbones, the hubs or mounting points. No external or internal suspension bracing or strengthening brackets, supports or straps are permitted, and any attempt to alter the dynamics, dimensions or operation of the suspension system (other than by 1.8.1 & will render the car as non compliant with these regulations.


1.8.3 1.9 Wheelbase / Track The wheelbase and front track width must remain as standard. The rear track width can only be altered by the use of washers / shims as per 5.8.1 Transmission


1.9.1 For manual gearbox cars, the only permitted gearboxes are the standard manual versions as fitted by the OEM factory. It is permissible to use any manual gearbox, from any eligible year, in any model.


The standard ratio differential must be fitted.


All gear linkages, gearstick, clutch cable, pivots, pedals and mechanisms are to remain as standard OEM in their fitment and operation.


Driveshafts, CV joints, hubs and hub bearings must remain as standard / OEM.


Clutches may be upgraded.


Cars fitted with the standard OEM Automated gearbox system are permitted, however only if this was factory fitted to the car being raced, and with absolutely no modification to any mechanical, electrical or hydraulic part.


Prohibited modifications It is strictly prohibited to modify any internal or external part of a gearbox away from the original factory specification. It is not permitted to modify the differential in any way. It is not permitted to use the differential from an automated gearbox in a manual gearbox car.


1.10 Electrics

1.10.1 Exterior Lighting Except number plate lights, all rear exterior lights must remain as standard for the model being raced, Front lights may be replaced with blanks unless there is a risk of reduced visibility due to darkness or rain. Where a car has factory fitted DRL’s (daylight running lights), these may be left in place or disabled and removed.


1.10.2 Rear Warning Light / Rain Light Cars must be fitted with a manually switchable rearward facing red warning / rain light which must be fully compliant with the Motorsport UK Year Book ruling: Section K 5.1.


1.10.3 Batteries / Starting The charging system must remain completely intact, and the car must remain fitted with a standard or standard pattern fully operational alternator. It is not permitted to alter the alternator belt pulley size from standard.


A lightweight / reduced size / race / gel battery may be fitted, however this must be securely mounted and sealed.


1.10.4 General Electrical

All airbags must be removed. The dash top airbag cover must be refitted. The airbag warning lamp may be disabled. Other than the rear wiper motor plug (to allow it to be utilised for the rain light), it is prohibited to remove any standard OEM wiring or connector plugs from any part of the electrical system unless connected to the removed Airbags, these may be trimmed back and capped to look neat and tidy..


Front windscreen wiper(s) must be fitted and must operate as standard. The wiper arms must remain the standard items. The rear window wiper, wiper arm and motor may be removed. The hole in the rear tailgate screen must be blanked off.


Excluding seatbelt and airbag warning lamps which may be disabled, all standard OEM dashboard and functions must be retained and operational.


It is permitted to fit and use data logging equipment; however, this must be fitted in such a manner that it does not interfere with the standard functionality of the original dash clocks.


The standard ignition barrel must remain fitted; however, an additional starter button may be installed.


It is not permitted to modify the functionality of the OBD port.


A battery cut-off master switch must be installed. When operated, this must isolate all electrical systems with the exception of any that may operate the fire extinguisher system. The pull cable / operating button must be situated within easy reach of marshals at the vehicles side and clearly marked / labelled.



1.11.1 The complete braking system in terms of its componentry and operation must remain as standard OEM. Brake discs, calipers, drums, shoes, cylinders, servo, fluid reservoir and cables in terms of their design, materials and fitment must all remain as standard / standard pattern / OEM. The standard handbrake must remain fully operational and must be capable of operating as intended at all times.


1.11.2 Permitted Modifications.

It is permitted to relocate brake lines to the inside of the vehicle.


It is permitted to upgrade the standard brake hoses to braided steel version. Choice of manufacture is free.


It is permitted to upgrade the standard front brake discs to drilled, grooved versions of the same size as OEM. Choice of manufacturer is free


The front brake pad and brake Shoe brand material and manufacturer is free.


1.11.3 Prohibited Modifications

The ABS system must be fully enabled and operational at all times.


It is not permitted to fit any kind of brake biasing or brake pressure limiting mechanism anywhere in the braking system.

1.12  Wheels/Steering

1.12.1 The choice of steering wheel is free.


It is permitted to replace the standard steering wheel, and to use an aftermarket steering wheel boss as required.


The steering lock mechanism must be removed or rendered permanently inoperative. All other aspects and operation of the steering system must remain as standard OEM.


1.13 Tyres

1.13.1The mandatory Championship control tyre is the MRF ZTR medium or hard compound. Only tyres purchased from the nominated suppliers will be permitted. Tyres purchased from elsewhere will not be allowed. Logs will be kept by the nominated supplier.


MOT Trackdays ltd

Building 8,

The Old Depot,

Bridge St,

Weedon Bec,



07818 003267


1.13.2 The use of tyre heating/heat retention devices, tyre treatments and compounds is prohibited. It is not permitted to buff, cut, shave or mechanically interfere with tyres in any way.


1.14 Vehicle Weight Minimum 950kgs including driver post practice/ qualifying or post race.


Random checks will be carried out during the season and no car/driver combination shall be below this minimum weight. All minimum weights are including driver and race overalls, helmet, residual fuel etc.


Should any car require to be fitted with ballast to enable it to meet minimum weight requirements, only ballast which is fully compliant with MSUK regulations may be used and securely and correctly mounted on the passenger side floor, No other type of ballast or positioning of ballast is permitted.


1.15 Fuel Tank/Fuel

1.15.1The standard fuel tank must be fitted in its original position and must remain unmodified in any way. It is permitted to use correctly installed fuel tank baffle foam or fuel tank baffle balls. It is not permitted to alter the fuel tank dimensions, OEM capacity or operation by any other means.


1.15.2 Fuel

Only petrol as defined in Section B Nomenclature & Definitions, Pump Fuel (a) section of the Motorsport UK Yearbook and complying with, BSEN228 may be used. The use of additives by competitors which boost the octane rating (RON) in any petrol is prohibited.


At the end of practice and the race at least 3 litres of petrol from the tank of the competing car must be available to the scrutineers for analysis. Compliance with minimum weight for the car will be taken before the petrol is removed.


1.15.3 The use of fuel additives is not permitted.


1.16 Silencing All vehicles must comply with the relevant maximum noise limits set out in Motorsport UK YearBook regulation J. Chart 5.18.


1.17 Numbers & Championship Decals 1Positions:

The race numbers for each rear side window shall be as per (Q)11.5.1; (i) 200mm high. (ii) With a stroke width of at least 20mm. (iii) Coloured Day-Glo yellow. (iv) Driver names are permitted but must appear under the race numbers on each rear side window and be in white font only at a maximum of 100mm each letter.


1.17.1 In addition, the windscreen of all cars must display the competition number positioned on the upper area of the passenger side of the windscreen, as follows; (i) The numerals must be 150mm high (ii) Be in the same colour and font as those displayed on the rear side windows (iii) Be placed no closer than 50mm from the lower edge of the windscreen “sun-strip” and 50mm from the side edge of the windscreen. (iv) Driver and/or team names are not permitted on the windscreen.


1.17.2 Series Sponsor’s decals must be affixed in the positions detailed on the diagram supplied by the series Co-ordinator. series Sponsor’s decals take preference to any other decals. It is not permitted to make any alterations or additions to Championship decals including the front and rear sun strips. Drivers may be requested to remove decals that are viewed as conflicting with official series Sponsors. Failure to comply will render the vehicle and driver ineligible to race.


1.17.3 Suppliers Sponsors and Club decals will be available at or before the first series race in which the vehicle is entered. Competition numbers will be obtained at the competitor’s expense.

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