BRSCC MX-5 SuperCup Technical FAQs

Below is just a selection of common technical questions about the MX-5 SuperCup cars. For further information please contact the championship organisers, one of the many car preparers or why not come along to a race meeting and speak to the drivers themselves, who will be happy to offer help and advice.

Do I need the later model year engine? -

During production of the MX-5 Mk3 2000cc MZR LF engine there was a revision for the 2009 model year (Mk3.5 facelift) however the standard power output and torque as stated by Mazda UK remained unchanged. The main difference between the two variants being a change to forged material for some of the engine internals and a 500rpm increase of the rev limiter up to 7500rpm. The mandatory standard championship ECU map brings ALL engines up to a 7500rpm rev limit.

Experience gained over numerous seasons racing of both versions of the 2 litre MZR LF engine has shown there is no power or reliability advantage to be gained from running the later model engine.

Is oil surge an issue on track? -

No, there are no issues of oil surge affecting the MX-5 Mk3 engine during competition while running on MSA List 1c tyres.

Is additional engine cooling required? -

There are no overheating issues associated with racing the MX5 Mk3 2.0 and the standard radiator MUST be retained. As standard the car comes with an oil/coolant heat exchanger sandwich plate between the oil filter and block, if this is not fitted it can be purchased as a standard Mazda component.

How is  the ECU map policed? -

Championship scrutineers have access to laptop and software able to verify if a car is running the correct engine map. This may be checked at any time during a race meeting or the ECU can be sealed and removed from the car for inspection after the race meeting.

I’ve heard about reinforcement of the 3rd gear selector fork, what is this? -

A documented issue with the pre-2009 Mk3 2.0 sport 6 speed gearbox is a potential weakness of the 3rd gear selector fork, This has been known in a small number of cases to fail while racing. 2009 and later gearboxes use a stronger component which can also be retrofitted to earlier gearboxes. It is permitted to strengthen this component, an example of which is shown below:

Do I need to fit an uprated race clutch?  -

The rules permit alternative friction plate material to be used as an option, however the vast majority of drivers race using the standard clutch without any issues.

Can I convert power steering to a manual rack? -

Yes, this modification is permitted in the regulations however due to the speed of rack and high cornering loads through the steering it may make the car very difficult to drive. This is not a common modification and is not recommended.

Can I remove the air conditioning compressor? -

Yes, this can be removed and an idler pulley and shorter auxiliary drive belt are available as bolt on replacement standard Mazda parts.

Tyre shaving. Is it necessary? -

The regulations permit shaving of the tyres. The main reason for this being that it cannot be policed through scrutineering as once used on track it is impossible to tell the difference between a worn tyre and worn shaved tyre.

Do wheel bearings wear out? -

The additional loads from running competition tyres can shorten the life of the standard MX-5 front wheel bearings. It has been found that original front bearings as fitted at the factory last a long time on circuit but subsequent non original equipment Mazda replacement bearings can wear out very quickly. It is common practice and permitted by the regulations to fit the larger front wheel bearings from the Mazda RX-8. These larger wheel bearing assemblies are a direct replacement and are more suited to track use.

How easy is it to change the car set up? -

Those familiar with earlier model MX-5s will be aware that geometry alignment was tricky to change due to camber and toe both being affected by a single bolt adjustment. The MX-5 Mk3 is much simpler to set-up with independent toe and camber adjustment both front and rear, ride height is adjustable on the control GAZ dampers.

Do I need brake cooling ducts? -

It is permitted to run with brake cooling ducts if the driver feels they are necessary; however the majority of cars race without, some even retaining the standard road car backing plates. Carbotech and EBC Yellowstuff are a popular brake pad choices but brake pads are ‘free’ in the regulations.

Is it difficult to get down to the 1110kg minimum weight limit? -

No, this limit is set to ensure no drivers are penalised and a selection of lightweight body panels are permitted to assist. However for the majority of competitors these are not required, many running with additional ballast to stay above this minimum.

Why do some cars run a rear deck cover, what does it do? -

In the early days of MX-5 Mk3 racing one driver fitted a fabricated sheet aluminium cover in order to tidy up the area where the folding roof would usually sit. This raised concerns that it gave an aerodynamic advantage and subsequently a number of drivers decided to do the same. In reality there is no aerodynamic advantage to this component but it does act as a firewall between driver and fuel system for safety scrutineering purposes.  If this panel is not fitted any holes in the standard rear bulkhead must be blocked off.

Front Bumper Styles -

During the life of the MX-5 Mk3 there have been three cosmetic ‘facelifts’ so there are three different styles of front bumper available (Mk3, Mk3.5 & Mk3.75). Each are permitted in the championship and any older style bumpers can be updated to a newer style without modification to the mountings, however the original headlight units will not fit into the later bumpers so would also require updating or alternatively blanking off.


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