Complimentary Transmission upgrades

A fast road engine will be quite capable of pulling a higher final drive ratio. The recommended change will be from 3.73 to 3.54 to 1 giving an extra 2 mph per 1000 rpm in fifth gear. For engines fitted with auto transmission, the standard final drive ratio is 3.54 to 1 and the recommended change there will be to 3.31. This would also be the recommended change for manual DB4 cars fitted as standard with a 3.54 to 1 final drive.

An additional option is the fitment of a 6 speed manual. Currently not a standard transmission option, it could be offered if desired and would potentially enable a further reduction in the final drive ratio for manual cars from 3.54 to 3.31, with 6^th gear giving a road speed in the region of 35mph per 1000 rpm. Such an option could realise a very useful improvements in fuel economy.

In summary the options are:

• Final drive ratio change – 3.73 to 3.54 to 1

• Final drive ratio change – 3.54 to 3.31 to 1

With other changes:

• 6 speed manual plus change of final drive from 3.73 to 3.31 to 1

• 5 speed auto with 3.54 to 1 final drive

Complimentary Suspension Upgrades

A general refit and upgrade of the suspension is strongly recommended when moving to a fast engine specification. The key options that are available are:

• The Monte Carlo handling kit. This brings:

• Stiffer front roll bar

• Fast road front and rear springs

• Up-rated Koni front dampers

An additional change highly recommended will be the fitment of telescopic rear dampers in place of the standard lever arm shock absorbers

Complimentary Brake & Wheel Upgrades

The brakes fitted as standard on DB5 and 6 cars, which is a 4 wheel all disc duplex Girling brake system has proven to be effective and capable of adequate retardation form very high speeds consistently and safely. With DB4 cars, the early simplex all disc brake Dunlop system lacks the same capacity to absorb heavy heat loss arising from very high speed speeds. The recommended changes to the standard brake systems are:

• DB4 – Fit the standard duplex Girling Brake system upgraded as below.

• DB5 & DB6 – Improve brake system resilience as follows:

  • Fit harder Pads

  • Upgraded Brake Servo assistance

• Wheels : Default to move to 6.J rim size wheel and to fit 205/70 section radial tyres with an added option to fit 225/70 radial tyres on 15 wheels.