North Island Verses South Island Rules: Challenge/Open Class

Tim Fensom
posted Jul 31, 2013 at 8:54 PM

South Island:

Class 6 : Open

1) SPECIFICATION – “Open” are a progression from “Clubman’s”. They must resemble volume produced commercial or recreational vehicles.
Vehicle must be up to LVVTA standard (if required), have a current W.O.F. and be registered.
Rollcage 4 point min. (see attached Oranz Spec.)
No steel cables

2) ENGINE – Open
Radiators may be relocated within the frame.

3) BODY – Open

4) CHASSIS – Open
Framing for safety cage, body mounting, suspension, etc. may be permanently attached.Uni-body or monocoque construction is permitted providing the original rigidity and strength is not compromised in any way.
Refer to Rule 5 Protection for Soft Tops.



7) AXLE – Open

Cool TYRES – Maximum 930mm diameter and 343mm width.

North Island:

Vehicle Rules for Challenge Class
18.1 The chassis must be from an OEM production based 4WD vehicle. The chassis may only be shortened forward of the front tyres and rearward of the rear tyres. Other than this approved modification the dimensional width of the chassis must remain the same and the length of the side rails must also remain the same as the OEM specifications.
18.2 The chassis side rails may not be cut between the front and rear axle positions for modification purposes (other than for repair).
18.3 The chassis may be strengthened and must maintain the minimum number of OEM cross-members.
18.4 The wheel base may be altered by moving the axles either fwd or rearward from their OEM position provided they stay within the original chassis frame work within the limits of Rule 18.1.
18.5 Additional spring and shock absorber mountings are unrestricted.
18.6 Spring and shock absorber mountings may be strengthened.
19.1 The body of the vehicle shall be from a MC class (refer to LTNZ) 4WD vehicle of the same OEM as the chassis.
19.2 The entire body shell must be OEM forward of and including the ‘B’ pillar. Doors, guards, grill, light surrounds and bonnet of the vehicle type shall remain readily recognisable as OEM forward of the ‘B’ pillar.
19.3 The firewall and floor pan may be altered to allow for engine and transmission fitment but must remain readily recognisable as OEM.
19.4 The inner guards may be altered to allow for suspension and engine fitment but must remain readily recognisable as OEM
19.5 Aftermarket panels including bonnets with the addition of scopes, doors, guards, windscreen surrounds, and grills are permitted provided they remain readily recognisable as OEM. All aftermarket panels encompassing the passenger compartment must be equivalent strength as OEM.
19.6 The bonnet must have a secondary catch.
19.7 Body lift spacer must be no more than 75mm.
19.8 The flaring and trimming of guards is acceptable provided they remain readily recognisable.
19.9 Flares are unrestricted.
19.10 All vehicles must run a minimum of a half door.
19.11 Body profile modifications and alterations are permitted behind the ‘B’ pillar as listed:
(a) “Bob tailing” is permitted, provided the vehicle type remains readily recognisable.
(b) Well-side Ute modifications are permitted provided the vehicle type remains readily recognisable.
8 4x4 Challenges NZ Inc. Winch Challenge Competition Rules 2012, Version 10 13/11/2011
(c) Tray-back modifications are permitted, provided there is a recognisable structurally rigid decking surface the minimum width of the cab and extending back to align, at least, with the rear of the rear tyres.
20.1 Replacement engines from any automotive engine manufacturer are permitted, but any conversion must be certified.
20.2 The engine may be modified to include:
(a) Super chargers.
(b) Turbo chargers.
(c) Intercoolers.
(d) Alternative engine management systems and fuel systems.
20.3 All engine cooling radiators apart from oil coolers must remain within the confines of the front grill and the engine bay.
20.4 Snorkels and aftermarket air filters are unrestricted.
20.5 Oil coolers, filters and their attachments are unrestricted.
21.1 All batteries must be secured adequately.
21.2 Batteries mounted in the cabin must be enclosed and vented to the outside unless the battery is a sealed unit.
21.3 A mechanical battery isolation switch for the battery(s) that provide power to the engine, ignition and fuel pump is required. The switch must be within easy reach of both the Driver and Co-driver when they are seated in the vehicle with their full seat belt harnesses on. It must be clearly marked and it’s ‘on’ and ‘off’ positions easily recognised. This switch may isolate the negative terminal.
22.1 Vehicles must be fitted with a minimum of a six point roll cage for rollover protection. The roll cage must be manufactured to NZFWDA, CCDA, ORANZ or Motorsport NZ specifications. Documented proof of cage specification or accredited certification will be required.
23.1 4X4 Challenges NZ Inc. will produce a vehicle Log Book when a correctly completed application is received and when the appropriate fee is paid. Further information and an application form are available for download at 23.2 All vehicles must be registered and have a valid Warrant of Fitness.
23.3 All vehicles must have either a valid 4X4 Challenges NZ Inc. Log Book or the Warrant of Fitness must be no older than 28 days.
23.4 All vehicles must have third party insurance cover.
23.5 Vehicles must be LVVTA certified if required.