issue this manual must be read in conjunction …€¦ · issue 2012 –04/01-02-2012 this manual...

Issue 2012 –04/01-02-2012 THIS MANUAL MUST BE READ IN CONJUNCTION WITH THE BTCC TECHNICAL NGTC REGULATIONS


General Guidelines - Homologation Criteria ( NGTC TECHNICAL REGULATION 3.1)

A Constructor may make application to the Administrator to Homologate a car, solely for use within the BTCC subject to: It being from a model with a production minima of 2,500 cars It being from a family with a production minima of 15,000 cars The engine has a production minima of 2,500 from the manufacturers family of

marques. The production minima of the engine, the model and the family must normally have

been achieved prior to the final race of the Championship in its first full season or the homologation may be invalidated.

The family and model being freely on sale in the UK through the manufacturers normal dealer network.

The Administrator may consider applications for cars very close to, but below, the nominal minimum length of 4.4m 3.1.1 ‘Model’ definition All the identical cars belonging to a family (see below) and to a production series distinguishable by an identical conception and identical external general lines of the bodywork, and by an identical mechanical conception of the engine and the transmission to the wheels. At least 2,500 cars must have been produced in 12 consecutive months. For all cars of the same model, the materials of the front and rear bumpers must be identical. The same applies for the material of the boot lid, engine bonnet and front wings, respectively. The bumpers of cars derived from the same model may not include adjustable parts. 3.1.2 ‘Family’ definition Different series models belonging to one and the same production series of the same manufacturer. At least 15,000 cars with identical external general lines of the bodywork must have been produced in 12 consecutive months. The wheelbase as well as the material of the bodywork/shell (including the doors) must also be identical. All models must be available through the normal commercial channels of the manufacturer. The external general lines of the bodywork may vary in the following details: - shape and material of front and rear bumpers, - material of the boot lid, engine bonnet and front wings, - removable aerodynamic devices (spoilers, wings, sill mouldings), - control and comfort equipment (sun roof, auxiliary lamps, door handles, exterior mirrors), - decorative strips and mouldings, - left- and right-hand drive versions, - 2 and 4-door versions, provided that these differ only with regard to the doors, door openings and B-pillar. Models with differing cylinder capacities can be counted towards establishing the ‘family’ minima.

NOTE: THESE ARE GUIDELINES ONLY AND MUST NOT BE READ IN ISOLATION OF ALL APPROPRIATE BTCC TECHNICAL REGULATIONS.


Initial Bodyshell Set Up Once you have chosen your base car you will need to locate the position for the front and rear ‘subframes’. This is determined by the layout of your chosen base vehicle, as the wheelbase of the race car must remain within the +/-10mm tolerance of the homologated road car figure. Once you have set the A-post position this becomes the ‘A’ datum point which allows you to locate the front and rear subframes and the rest of the cage structure, whilst keeping both frames parallel to the grounded Front Subframe The front axle is Y from the A-post datum point, which is determined from the base vehicle’s homologated wheel position. Y is defined as X (181mm Front Subframe) + bulkhead connections from A-post datum to subframe. The tube layout in the area labelled as ‘Bulkhead’ is free, however the design must be submitted to TOCA for approval. The engine and gearbox positions are fixed within the subframe. Rear Subframe The rear ‘subframe’ is positioned by the wheelbase of the homologated (+ tolerances) base vehicle, measured from the front axle line.

A

514.0

Y X

WB

59

4.0

345.0

20.00

All Dimensions are mean figures. All measurements of fabricated parts +/- 2mm unless stated. All measurements of machined parts +/- 0.2mm unless stated. This applies to all measurements unless stated elsewhere in this manual.


A

B

51

4.0

C

WB

594.00

34

5.0

Y

X


FRONT WHEEL DRIVE CRANK CENTRE LINE DEFINITION


Front Subframe The front frame attaches to the roll cage/bulkhead using 6 index bushes. The 6 index bush locations are determined by the use a jig. GPRM’s version is pictured below, with the car set at 285mm from surface plate. The front subframe houses the engine, gearbox, brake system, anti-roll bars, steering and suspension. There are two types of index bushes available a shorter version which is flanged or a longer version which is not. They are both capably of being centre draw only. A typical set of index’s consist of 4 short and 2 long however you could use 6 long. You may remove part/all of the flange on the short index if required when using the 6 centre draw bolts.

Example of GPRM Front Jig

Front Bushes

Front Frame Model


Front Index Positions

All measurements +/- 0.1mm


Front Tolerance’s Yellow - +/- 2mm Blue - +/- 2mm Red - +/- 1mm Black - N/A


Rear Subframe The rear jig gives the locations for the 4 housing sleeves for the subframe to locate in and the rear roll cage tubes. The rear subframe houses the air jack, suspension, brakes, anti-roll bar and (for rear wheel drive vehicles) the differential. The rear subframe attaches to the roll cage using 4 sleeves/bushes with 4 nails and collars. The front of the rear subframe must be linked to the chassis via TOCA specified clevis NGTC-D-024. The link and attachment method to the chassis is free.

Rear Bushes (4x) Rear Frame Model

Example of GPRM Rear Jig


Rear Index Positions

All measurements +/- 0.1mm


Front Tolerance’s Yellow - +/- 2mm Blue - +/- 2mm Red - +/- 1mm Black - N/A


Front Frame Installation of the front frame: Do’s 1. Attach front cross section. 2. Apply ant-seize compound (copper slip) to the 6 male and female index’s. 3. Support frame from underneath. 4. Pull the frame evenly into the index’s using the 2 centre index’s. 5. Support from underneath Don'ts 1. Don’t lift the frame using straps around either the top or middle side tubs. 2. Do not apply any pressure to any of the suspension or rocker pick ups. Rear Frame Installation of the front frame: Do’s 1. Attach dog bone. 2. Apply anti-seize compound (copper slip) to the 4 male and female index’s. 3. Ensure that the 4 collars at seated correctly & unobstructed. 4. Support frame from underneath & level. 5. Raise rear frame until all 4 bolts have been engaged. 6. Pull up evenly using the 4 nails & bolts. 7. Once in place remove the travel bars. Don'ts 1. Don’t remove travel bars until installed. 2. Do not pull up into place using less then 4 bolts. 3. Do not lift unevenly.


The generic ROPS design has been calculated, analysed and validated by MIRA. The length and width of your ROPS will change dependent on your base vehicle, however the tube dimensions must remain as per the design and must comply with the material specifications as stated in FIA 253 Article 8.3.3. You are permitted to use the following as an alternative to the standard ROPS design: Roof bars (A): You are permitted to follow FIA 8.3.2.1.3 drawing 253.12 in conjunction with drawing 253.23 instead of drawing 253.14 in FIA 253 Article 8. Roof bars (B): You are permitted to follow FIA 8.3.2.1.3 in conjunction with drawing 253.21 in instead of drawing 253.22 in FIA 253 Article 8. Seat Belt Fixings: Seat Belt Fixings are free as long as the belts are attached as per FIA 253 Article 6.2 Once these changes have been ascertained the new dimensions must be submitted to MIRA for confirmation, who have agreed a reduced fee for this service. This can be done via Martin Legge. Direct Tel: +44 (0)24 7635 5704 Email: [email protected] On receipt of the information from MIRA you need to apply for a MSA Safety Cage Certificate. This can be done via e-mail to [email protected]

Front view of ROPS Rear View of ROPS

mailto:[email protected]


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Rear Subframe The bar that goes between the two rear frame index bushes must be at least 30mm from the bottom of the index bushes. This is to ensure that there is enough clearance for the push rod and rocker. The diagram blow is a side view of the two index bushes and rear subframe.


Exhaust system (6.4.18)

The exit of the exhaust pipe must be situated at the left-hand side of the car, within

the perimeter of the car, and be less than 10 cm from this perimeter. A

‘megaphone’ may be incorporated into the exhaust exit pipe. The Technical

Manual details the modifications to the bodyshell. Other than for the ‘megaphone’

section, the cross-section of the exhaust silencers or of the catalyst itself must fit

into a rectangle; the aspect ratio of which must not be greater than 2.5.

Bodyshell Modifications

Refer to BTCC NGTC 2011 Technical Regulations 7.7 Bodyshell

Any part of the bodyshell structure removed during the fitting of the exhaust system must

be replaced.

Example of Exhaust Cut-out


Driver’s Seat Position

The driver’s seat must be fitted as close as possible to the centre line of the car

allowing for the exhaust and seat mounting bolts, as per Drawing 10 in the BTCC

Technical Regulations.

Parcel Shelf

The manufacturer-fitted parcel shelf structure may be removed, provided that any

section that is part of the rear window frame remains.

Fuel Tank Position

The Fuel tank position between the rear subframe and B hoop of the roll cage

should be as central as possible, as per Drawing 12 in the BTCC Technical Regulations.

There is a +/- 10mm on the height of the tank and left to right position of the tank.

Flat Floor Pockets

The flat floor can be pocketed, however it must be attached to the subframe via its

top surface and complete 12mm thickness.


Steering Rack Pinion Location

Below is the location of the steering rack pinion reference from the front frame index

bushes. Mirrored for right hand drive

issue this manual must be read in conjunction …€¦ · issue 2012 –04/01-02-2012 this manual...

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