Seven heaven
Jonathan Palmer loves the Caterham Seven so much, he’s developed his own (again). Matt Prior joins him in a quest for handling perfection
Jonathan Palmer’s new Caterham
Acar maker would call it an abuse test. Every March, Palmersport’s doors open for drive events at Bedford Autodrome. People come, they thrash cars around for the day, encouraged to drive as fast as they can by Jonathan Palmer’s race instructors, and go home, happy and knackered.
By the end of each year, 12,000 people have taken part, with each of Palmer’s track cars covering 25,00030,000 miles – the equivalent of seven racing seasons. They might spend 60% of their time at full throttle and, when they’re not, it’s full braking or full cornering with varying levels of driving finesse.
At the heart of it all – in a fleet made up from BMW M2 Competitions, Renault Clio Cup cars, Formula 3000 single-seaters, JP-LM open-topped sports-prototype-alikes and evergreen Land Rover Defenders – are Caterham Sevens.
Palmer has used Sevens for virtually all of Palmersport’s 27 years. “We used to run them at Bruntingthorpe [the proving ground/airfield where Palmersport began],” says the boss, Jonathan Palmer. “Then when we came to Bedford, we designed each circuit around a particular type of car. The East Circuit is the tricky, sinuous one, which was designed for a Caterham.”
Partly as a result, Caterhams consistently top the customer satisfaction survey every Palmersport customer is asked to complete. “The Caterham is fun. You can push it, you can slide it. That concept – front engine, rear-wheel drive – it’s unbeatable really,” says Palmer.
Having tried a few different variants over the decades, this year Palmer wanted a Seven specifically designed to let people jump in and get the best out of it and Bedford’s East Circuit.
To spec it, Palmer largely “told Caterham what we want”, and Palmersport built the cars, including installing an instructor’s second brake pedal (with the ability to kick the brakes off as well as on) and a comprehensive roll cage that allows easier access than a full race cage.
The car is the SV wide-bodied Seven, because clients are of all sizes and “you’ve got to fit them, in a minute. You can’t spend five minutes trying to get comfortable.”
At the heart of it is an engine and transmission of a spec not normally offered in a Caterham, a 2.5-litre Ford Duratec driving through a Sadev six-speed sequential gearbox, pneumatically operated by steering wheel paddles so drivers new to the car can forget about the clutch and gearlever once they’re rolling.
The 2.5, used in Ford SUVS overseas, is a version of the 2.0-litre engine fitted to cars (including Caterhams) in Europe, just stroked for more torque, which means it’s the same external size as the smaller capacity unit.
Palmersport removes the surprisingly heavy counterrotating balance shafts, lightens the flywheel and fits a dry sump. It runs, like most Palmersport cars, on liquid petroleum gas (LPG), with a Vialle system injecting fuel as a liquid, rather than, as is more usual, a gas, so the
The Caterham is fun. You can push it, you can slide it
air-fuel temperature is lower and power therefore higher.
Its output is 200bhp but, more importantly, “we want a responsive engine that’s torquey”, says Palmer. That the Duratec is naturally aspirated and relatively low revving, to about 6200rpm, is key.
Turbo lag or an engine that doesn’t come alive until 6000rpm is “irritating enough on the road,” says Palmer, “but put it on a twisty little circuit and it kills the enjoyment.”
It’s mid-february and Palmersport is in the midst of tuning the car’s handling for the circuit. And that’s where Autocar comes in.
We’ve been invited for a drive and to be the enthusiastic amateurs, to say what we think of the car’s handling while it’s being tweaked. Palmer and I will swap in and out of the car during the day, and his engineers and technicians will change the set-up.
There are various tyres, ride heights, springs, geometries and anti-roll bar settings to work through and Palmer goes about it with the kind of rigour for which the place – and the man himself – is renowned. At nearly £1000, Palmersport’s days are expensive, but known as the best in the business.
At the start, the car’s in a fairly standard set-up. It’s weighed at 641kg, on Academy race dampers with a standard ride height, and running 15in rims, with no front but a stiff rear anti-roll bar. There are some videos of the new Seven on Palmer’s website and, I suspect, they were shot with it in this form, because it looks hilariously oversteery. Sure enough, the car wants to swap ends as soon as you look at the steering wheel and body movements are too noticeable.
A change of tyre makes it more drivable, but the quickest and most progressive is Nankang’s AR-1 track day tyre, though it feels like the tyres have too much performance for the chassis’ relatively soft set-up.
The ensuing mechanical tweaks make a bigger difference; the car is lowered, and race dampers and firmer springs are fitted. Palmer’s engineers clearly have an idea of where they think the car will go with these changes, but it’s gratifying that Palmer and I both prefer the set-up as they work through the iterations.
The car gets both faster and more predictable, but no less playful, and in the end, lowered with roll bars disconnected, is possibly the best Caterham I’ve ever driven. The engine’s broad powerband means you’re never left out of the rev-range, and the gearbox and its calibration are superb, letting you concentrate entirely on the handling. One final tweak reduces castor, and therefore steering weight, with no notable loss in steering feel.
The result is a really wonderful Caterham. The only time I might have had more fun in one was in a Supersport around the Rye House kart track. But this is, objectively and subjectively, better set up.
“Ultimately, we want the sort of set-up that, if you said ‘do you want to go and do 20 laps’, you’d just jump in and go,” says Palmer. Between us, we complete 104 laps. And I can’t think of a time when I wouldn’t want another 20.