First drive: New 2021 Bowler Defender Challenge racer

Bowler takes delivery of standard production Defender 90s and starts its work on them post-registration, performing a mix of mechanical changes but also electrical ones.

“We have the base vehicle’s electrical architecture and make changes as we need to,” says lead engineer Adrian Gregory. “For example, if you take the airbags out, the engine won’t start.” Unhelpful.

The Defender’s electronic stability control is the big thing to disable, understandably, given that a rally car has a rather different use case to a usual Defender, which will happily jump (I’ve tried it), but not like this one.

Disabling the yaw control on the steering switches that off. It currently limits the car’s top speed to 90mph, but that’s unlikely to be a problem on a Welsh hill rally.

“We worked with Special Vehicle Operations, who made the Bond cars [for the latest 007 film, in which Defenders jump big distances],” McKechnie says, “and asked them what they turned off.” But because a Challenge car starts road-legal and has to stay that way, a ‘race’ switch turns back on some of the systems that are necessary for compliance.

Mechanically, things are a little more straightforward but still different to the limited-production cars that Bowler is accustomed to making, such as the Bulldog.

“Normally we make our own chassis, build a safety cage on it and then clad it with bodywork,” explains Jez Siddall, Bowler’s head of design engineering.

Not so here. The Defender is a monocoque, so Bowler has had to design an FIA-compliant cage that fits inside the existing bodyshell and make sure that it has space to welds that penetrate all the way around the tubing.

And although it’s a stiff body, it’s mostly aluminium, a softer metal than steel, which means the plates where cage meets body are huge – much bigger than usual. And Bowler has had to tie them to crucial mounting points, too. For example, the dampers – external reservoir units made by Fox Motorsport – mount directly to the cage at the rear.

The Challenge car sits on coil springs, with a ride height 25mm taller than the standard Defender, but also smaller wheels (18in). It will accept bigger tyres than are fitted here, which is all part of Bowler’s futureproofing plan.

This Challenge car gets the changes it needs to keep it as affordable and approachable as possible (although we will come to that in a minute), and Bowler is ready to make more changes later if drivers want to take their cars further afield.

The Challenge car’s four-wheel drive system runs a regular Defender set-up, there’s no electronically controlled differential and the gearbox is still an eight-speed torque-converter automatic, albeit fitted with Bowler’s own single flappy paddle on the steering column.

Most of the other modifications beef up the Defender for the demands of rallying. Two small side radiators, which would be exposed to danger, have been removed and the frontal section has been opened up instead to allow more air into the single central radiator. 

There are new, more powerful supplementary driving lights in new housings (which are likely to become a Bowler accessory option later, because JLR fancies a slice of the aftermarket pie that independent tuners have been enjoying).

There’s a new rear roof lip spoiler, which keeps a bit of dust (but by no means all) off the rear screen and houses two powerful reversing lights so that you can more easily see your way out of trouble after you’ve had an off on a night rally.

Some 70mm is chopped from the bottom of the doors, which on the road car extend down to cover the sills so you don’t get muddy trousers when getting out of the car in winter, but which would be too exposed to damage while rallying. A 6mm-thick aluminium plate runs the length of the car’s underside instead, wrapping up and over the sills to act as a step for climbing over the cage.

Doing so is easier than in most competition cars, because the new Defender is so vast. There are two competition seats, the thick but incredibly neatly installed cage and just a few switchgear reminders that you’re in a Defender. It even retains air conditioning.