Supercharged Lotus Exige – PistonHeads

12 Nov 2014 | Author: | Comments Off on Supercharged Lotus Exige – PistonHeads
Lotus Exige

SUPERCHARGED LOTUS EXIGE

If you had to choose between a Lotus Exige and the Cup 240, which would it be? Sebastian Geisler checks them out

In contrast, the first Exige was a different animal. It was only built in limited numbers — about 600 cars — to offer drivers a road-legal version of the Motorsport Elise. It’s very fast on the track, but not really suitable for everyday driving.

Racing heritage

The S2 changed that. It was unveiled at the Geneva Motor Show in March 2004, at same time the Exige S2 Cup car, which was specially developed for the Lotus Cup Europe, and which Lotus describes as a road registered race car straight out of the box.

The race series has just finished its second season of regularity events and its first season of standard races, and continues next year. It’s rumoured that the system of the races based on regularity and the race rating will be confirmed. The timetable’s likely to consist of about nine weekends on circuits, most of them current or former F1 tracks, in Belgium, France, Germany, Italy, the Netherlands and, for the first time, the UK.

Both the Exige and the Exige Cup car are built on the same production line at Lotus’ plant at Hethel with only minor modifications. The difference is that the Cup car takes an extra three weeks to be assembled and modified at the Lotus Sport plant. That’s reflected in the price, as the Cup car is some Ј7,000 more expensive than the standard Exige and only available at one of the nine official Lotus Cup dealers.

Exige Cup

The following points differentiate the Cup version from the standard Exige:

Six-point FIA safety cage

Sport seats

Four-point seat belt

Electrically operated fire-extinguishing system

Battery isolation switches inside and out

Oil sump monitoring system

Adjustable front stabiliser

Two-way adjustable shock absorbers

Limited slip differential

Strengthened clutch plate and cover

Aluminium rims in silver

A Lotus Sport Division production plate.

Sport Exige 240R

The Cup Exige isn’t a limited edition — it’s only limited by the capacity at Lotus Sport and in the last 18 months, the division has produced some 55 cars. And this year, Lotus unveiled the first supercharged Exige at the Geneva Motor Show: the Sport Exige 240R — a 50-car limited edition that sold out within three weeks.

Due to the development costs involved, it was rumoured that Lotus will make the supercharger available as an option other Lotus cars, although it’s been available from Lotus Motorsport exclusively to the Exige Cup cars since July. Assembled in the Lotus Sport plant Hethel or at one of the European Lotus Cup dealers, the supercharged 240 will develop 243bhp instead of the current 189bhp from its Lotus-modded Toyota engine.

About 30 hours are needed to fit the supercharger. The kit contains 151 parts in total, including the Eaton supercharger itself, intercooler, modified engine management system, new grille for the air intake on the hard top, new catalytic converter and many other small bits and things like gaskets, bolts, tubes and screws.

Lotus Exige

To fit it, the rear clamshell, hard top, exhaust and many other small parts must be removed. But, unlike a turbo, a supercharger can be built around the engine, so it’s not necessary to open the engine. The intercooler will be fitted on the engine, which is why it’s not possible to fit this kit without modifications in the Elise 111R, although the design of the Circuit Car, unveiled at Shelsley Walsh this summer, shows that it’s possible to fit the cooler in a different place.

The supercharger kit including fitting costs about Ј8,700.

Driving the cars

We got hold of a new Cup 240 to see what it adds to the range. Entering the Cup 240 car is more difficult than the standard car due to the roll cage: if you’re going to wear a helmet in the car you have to be under six feet tall. If you prefer to drive it without a roll cage, the cage can be removed in an hour but both cars fit like race cars: the interior is small, but not too small and you immediately get the impression that you are as one with the car.

Fasten your three-point seatbelts in the Exige and the four-point belts in the Cup 240 and look in the mirrors. The rear view from the standard car was already restricted, but in the supercharged Exige you see nothing but the intercooler.

You can feel the difference between the two cars as soon as you start the engines. Their characteristics are completely different, the sound of the supercharged cup car being much deeper and throaty. And full power in the Cup 240 feels like sitting in a jet at take-off.

In the standard Exige, the cam profile changes at 6,200rpm, the rush is similar to someone pushing a button of a nitrous oxide-boosted engine. With the modified engine management system, the cam profile of the supercharged Exige 240 changes at 4,000rpm, but the effect is less spectacular than in the standard Exige.

The only problem — if problem it is — is that you simply can’t drive the supercharged car slowly. The sound of the supercharger alone is seriously addictive. So if you want to drive the standard Exige fast, when you’re following the supercharged Exige 240 you have to change gear much more often, especially at speeds over 60mph — and of course  the supercharged car reacts much faster than the standard.

The standard Exige offers a non-adjustable suspension from Bilstein, while the Cup 240 has an adjustable Цhlins suspension. The Cup 240 feels glued to the track due to the Yokohama semi-slick A048s, providing tremendous cornering ability. On the road, on the other hand, the Cup 240’s suspension feels more sensitive than the Bilstein dampers of the standard Exige, especially on the German autobahn at high speed, due to lorry-carved ruts.

The steering in both cars is similarly direct and offers a real go-kart feeling. The brakes are easy to handle and offer superb retardation, with no fade after several hard stops. On the car we tested, the Cup car had optional stainless steel brake lines and sport brake pads, which still improve the efficiency of the brakes, but the ABS kicks in more often.

Performance

With the Cup 240 we didn’t manage to accelerate to 60 mph in under five seconds, whereas Lotus claims 4.5 seconds. The standard Exige should achieve this in 5.2 seconds — we measured 5.5 seconds. We also compared the speedos on both cars with a highly accurate GPS-derived measurement and found that the speedos on both cars over-read by between 5-8 mph at 150mph, which is not a bad margin of accuracy.

Which to choose?

So which car do I prefer? For the road, the standard Exige is the one for me: the power is more than enough for daily use and it offers more comfort. The Cup 240 is the perfect toy for the track — on the road I would lose my driving licence within days.

Lotus Exige
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