Mark Seymour - Reference and Resources

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Description: Ginetta G40 Engine & Drivetrain

New Ginetta G40s come with new power units supplied by Ford Power. Ginetta makes modifications to items like the engine mapping (ECU), throttle body, sump and possibly lightened flywheel and specialist camshafts. The GRDC car is tuned to around 135 BHP, whereas Junior cars are tuned to 100 BHP and GT5 cars to 185 BHP, all using the same 1.8 Zetec engine. A dyno test on my G40 with 5,000 miles on the clock gave 140 BHP.

The G40R road-tuned car comes with a Ford Duratec 2.0 engine tuned to 200 BHP. The Duratec engine's exhaust manifold is on the opposite side (driver's side), so an engine change would need re-configuration of the exhaust, plus suitable drivetrain.

The throttle body is branded as Ginetta but is probably supplied by Jenvey. The sump is a Raceline wet sump kit for the Zetec RWD black top. There are various modifications to the engine peripherals that make it suitable for racing, such as the oil catch tank and connectors for power supply (e.g. for transponders) and of course the gearbox and transmission going to rear-wheel drive.

The gearbox and clutch are Mazda (MX5). The gearbox is a five-speed H-pattern on the GRDC and GRDC+ car (Junior and GT5 use a sequential box). The clutch is dry single-plate and should be treated with respect during racing (careful with the practice starts). The differential is Ford with a Quaife ATB mechanical LSD.

The exhaust has a catalytic converter just after the outlet manifold, in front of and above the passenger footwell, and a silencer box in the rear of the car, in the space above the diffuser and behind the rear axle. Silencing tends to wear off with use and the exhaust may become louder. After a year of use, the G40 may fail a static noise test of 98 db and is at risk at a 101 db limit (such as Brands Hatch GP circuit). You may also get pulled in for drive-by noise if the clamps have come off the airbox, giving induction noise. You can fix this with cable ties. You can only fix static noise with an extra baffle in the end of the exhaust (inner pipe 2" outer pipe oval 4x3"), or a new exhaust from Ginetta. For race scrutineering, the cat may be subject to camera inspection, looking for breakdown of the unit.

The G40 GRDC / Club engine, like other championship versions of the G40, is a sealed unit and must not be modified if you are using it in the championship. Bearing in mind the above, the following links provide information on the history and tuning of the Ford Zetec 1.8 engine and Ford Duratec 2.0 engine.