2007 Lotus Exige 1.8L Petrol · AU56 EHC

The Toyota C64 6-speed manual transmission is subjected to intense shock loads in the Exige S2, especially on supercharged Exige S models driven aggressively on track. The brass synchromesh rings on 2nd and 3rd gear wear prematurely under rapid, high-rev downshifts and heavy track use. Initial symptoms appear as balking, notchiness, or a graunching crunch when shifting into 3rd gear, or when dropping down from 3rd to 2nd with cold transmission fluid. Rebuilding the gearbox requires dropping the rear undertray and removing the gearbox from the engine cradle, incurring substantial labour costs.

The factory Exige S2 radiator uses an aluminium cooling matrix with crimped composite plastic end tanks. Over repeated thermal cycles and UK road vibrations, the crimped seams fatigue, loosen, and weep coolant along the end-tank joints. A weeping radiator will steadily lose engine coolant, risking catastrophic overheating for the all-aluminium Toyota 2ZZ-GE engine. Replacing the radiator is an involved 'clam-off' procedure requiring complete front bodywork disassembly, making an upgrade to an all-aluminium welded radiator the industry-standard preventative repair.

The rear toe control links on the Exige S2 are subjected to immense cornering stress, accentuated by track-focused geometry and high-grip Yokohama tyres. The factory outer ball joints and tapered studs can work loose or fatigue under repeated track load. In extreme track use, ball studs have sheared, resulting in instant rear suspension geometry collapse and unrecoverable high-speed snap oversteer. Specialists strongly advocate replacing factory links with a centre-braced motorsport toe link kit featuring high-tensile spherical rose joints.