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Dax 427, een prachtig stukje racehistorie…

Dax 427 "Tojeiro" De Dion

De AC Cobra stond model voor dit prachtig staaltje autotechniek. De AC Cobra is oorspronkelijk gebaseerd op de AC Ace: een ontwerp van John Tojeiro, die als adviseur aan DJ Sportscars verbonden was. Voor de fabrikant van de Dax 427 was het een uitdaging om het origineel van de AC Cobra zo dicht mogelijk te benaderen, en daar is men meer dan uitstekend in geslaagd.

De Dax 427 behoort al ruim 25 jaar tot de top van de Cobrareplica’s. In deze 25 jaar heeft Dax de wagen steeds verder doorontwikkeld, tot in detail. Hierbij moet u denken aan technische verbeteringen, lederen intrieurs, diepe brede sportvelgen en prachtige roestvrij stalen zijuitlaten. Daarom mag de Dax 427 eigenlijk niet meer als replica worden betiteld. Inmiddels leverde DJ Sportcars meer dan 2500 Dax 427´s wereldwijd, en dat is vele malen meer dan dat er van het origineel ooit zijn gemaakt.

Aan veiligheid is natuurlijk ook gedacht. Bijvoorbeeld is het chassis van beide types niet alleen erg ruim voor de inzittenden, het is ook voorzien van ingebouwde kreukelzones aan de voor- en achterzijde. Andere zaken zijn de “explosafe” benzinetank die als optie leverbaar is, rolbeugels inclusief gordelbevestigingspunten, en een inklappende stuurkolom bij een frontale aanrijding.

De Dax 427 is in twee types beschikbaar :

-1) 427 IRS (Independent Rear Suspension), onafhankelijke achterwielophanging

-2) 427 De Dion met CC&AR* (met De Dion achterwielophanging)

Beide uitvoeringen zijn ook verkrijgbaar met een “Extended footwell”, hierdoor ontstaat er ruim 5 cm meer voetruimte voor de bestuurder. Hiermee is de Cobra geschikt voor grotere bestuurders. Als motor kunt u kiezen uit een grote range V8 motoren van Chevrolet, Ford of Rover, maar ook andere typen motoren behoren tot de mogelijkheden.

* CC&AR is a unique and patented cross-linked double wishbone suspension system that counters roll (without the need for anti-roll bars) and maximises grip & predictability by constantly keeping all tyre treads in flat and even contact with the road.

 

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TECHNISCHE SPECIFICATIE DAX 427 IRS

Chassis:
Hooped ladderframe constructed from 10swg, 3″x2″ steel box with comprehensive cross bracing. Additional stiffness provided by three dimensionalised front and rear sections and bonded and riveted body assembly.

Body:
Composite reinforced moulded fibreglass construction, with jig bonded internal panels. Bonnet, boot and doors all double skinned.

Components:
Jaguar XJ front and rear axle, braking and suspension components with DAX suspension geometry, front anti-roll bar, steering rack and Spax fully adjustable coil over dampers.

Engines and Transmission:
Any American or Rover V8, Jaguar straight 6 or V12 with 4/5 speed manual or automatic transmission.

Front Wheels & Tyres:
Front – 9″ x Ø17″ Wheels with 235/45 R17 tyres or (Front – 7½” x Ø15″ Wheels with 215/60 R15 tyres).

Rear Wheels & Tyres:
Rear – 10″ x Ø17″ Wheels with 255/45 R17 tyres or (Rear – 8½” x Ø15″ Wheels with 235/60 R15 tyres).

Dimensions:
4040mm long, 1745mm wide, 1130mm high, 2280mm wheelbase, 1010kg weight (with Rover V8) ready to drive.

Performance:
Rover V8: 0 to 60 mph 7.5 secs. Top Speed 130 mph.
Chevrolet V8-454 cu.in: 0 to 60 mph 3.9 secs. Top Speed 160 + mph.

 TECHNISCHE SPECIFICATIE DAX 427 De Dion

Layout:
Front engine, rear wheel drive.

Chassis:
Robust multi-tube 75mm x 50mm x 3mm box-section chassis with comprehensive round-tube triangulation and extensively braced / triangulated backbone section. Chassis includes separate triangulated scuttle-hoop section, structurally laminated into internal body tub and bolted across entire main chassis structure for maximum rigidity. All brackets included for engine, transmission, rear hoop/s, seats, seat belts, door hinges, differential unit, suspension arms & links, steering rack, etc.

Body:
Gel-coat finished GRP body, hand-laminated in high-heat distribution resin. All internal panels – passenger compartment tub, boot tub and front inner wheel arches – jig bonded into position, for easy and accurate body / chassis assembly. Double-skinned bonnet, boot and doors. (No GRP work required by the builder.)
Note – Body and chassis are designed to interlock with bonded and riveted faces to form an integrated immensely rigid (rattle & squeak free) structure.

Safety:
Crumple zone design. Collapsible steering column (plus intermediate steering shaft offset with two UJs). Main chassis rails extend to full vehicle width for greater driver / passenger protection. Optional ‘Explosafe’ fuel tank.

As with all DAX vehicles, the Tojeiro is designed to meet the full type approval standards of the UK’s SVA test.

Suspension/Axles:
Front
Camber Compensation & Anti-Roll (CC&AR) front suspension system* using DAX upper wishbones, pivot bar assemblies and CC&AR cross-links with Jaguar / Daimler (XJ40) steering knuckles, wheel hub/flange assemblies and lower wishbones. GAZ gas-filled coil-over damper assemblies with full adjustment for height and damping.

* Patented, cross-linked, double wishbone suspension system, which provides maximum tyre-to-road contact and therefore maximum grip, whether cornering, accelerating, braking, or in any combination.

Rear
DAX De Dion rear suspension design using DAX axle beam, upper A-frame and lower radius arms with Jaguar / Daimler (XJ40) differential unit, driveshaft assemblies (modified to use CV inner joints), rear hub carriers and wheel hub/flanges. GAZ gas-filled coil-over damper assemblies with full adjustment for height and damping.

Differential Options :

Ratio XJ40 Donor Model Tojeiro Engine Recommendation
3.77:1 2.9l Manual Rover V8 (geared for maximum acceleration)
3.54/3.58:1 3.6l Auto Rover V8 (geared for touring) + Ford/Chevy Small Block + Ford/Chevy Big Block (geared for maximum acceleration)
2.88:1 V12 (Very Rare) Ford/Chevy Big Block (geared for touring)

Steering:
DAX rack and pinion steering (3 turns lock to lock) operated by Ford Sierra collapsible safety steering column.

Brakes:
Servo-assisted, dual-circuit, 4-wheel disc brake system using DAX pedal box and Ford servo & master cylinder (23.8mm diameter). Drum and shoe handbrake, operated by special DAX fly-off handbrake lever (drops to horizontal when not in use) – can also be sourced from Jaguar XJS.

Front
Jaguar / Daimler (XJ40) front discs and calipers, vented.

295mm diameter – from 1986 to ’90 (Girling brakes) 291mm diameter – from 1990 to ’94 (ATE brakes)

Rear
Jaguar / Daimler (XJ40) rear discs and calipers, non-vented. Handbrake function provided by centre, drum & shoe section, of each rear disc.

278mm diameter – from 1986 to ’90 (Girling brakes)
294mm diameter – from 1990 to ’94 (ATE brakes)

Wheels:
The DAX Tojeiro De Dion can be fitted with 17” or 18” diameter wheels and tyres.

WHEEL DIAMETER FRONT
(Tyres)
REAR
(Tyres)
17″ 8.5″ x 17″ with 32mm Inset
(235/45 x 17″)
9″ x 17″ with 22mm Outset
(255/45 x 17″)
18″ 8.5″ x 18″ with 32mm Inset
(235/40 x 18″)
10.5″ x 18″ with 6mm Outset
(295/35 x 18″)

Engines and Transmission :
The DAX Tojeiro is designed to accept any commonly available V8 (English or American) or any Jaguar / Daimler (XJ40-based) unit. The most popular engine choice by far is the small-block Chevrolet V8 but DAX hold jigs for all common options.

DAX will also be happy to undertake the fitting of other suitable units, subject to a modest tooling charge.

Dimensions:
Length – 4030mm (with nudge bars and overriders fitted)
Width – 1755mm
Height – 1110mm (to top of windscreen)
Wheelbase – 2280mm

Typical Performance: – with Chevrolet V8 (Approx. 400bhp)
0 to 60 mph: 4.5seconds
Top speed: 160+ mph, depending on gearing

Wijzigingen en foutieve vermeldingen voorbehouden.