Before the championships and before Monaco in the rain, there was an oddball, front-wing-radiator-equipped Toleman and a 24-year-old Brazilian kid nobody really knew named Ayrton Senna. That car, Toleman TG183B chassis number 05, is heading to RM Sotheby’s Monaco auction on April 25th and it’s kind of a big deal.
A Team That Punched Above Its Weight
Toleman Group Motorsport was never supposed to be a Formula 1 team. The operation was born out of a family-owned car transport business, evolved through Formula 2 and Formula Atlantic, and somewhat improbably muscled its way onto the F1 grid in 1981. It ran its own turbocharged Hart engine at a time when the big squads were throwing serious money at the turbo arms race. By 1983, the team had clawed its way to ninth in the Constructors’ Championship. Rory Byrne, who’d go on to design championship-winning vehicles at Benetton and Ferrari, penned the TG183 alongside John Gentry.
The Chassis That Launched a Career
TG183B-05 was built over the winter of 1983 as a stopgap while Toleman finished the TG184. It was, by that point, already a generation behind where the team wanted to be. Front-wing-mounted radiators and intercoolers gave it a distinctive boxy silhouette and made it somewhat unpredictable at high speeds. The Hart 415T, a 1.5-liter turbocharged inline-four, pushed around 800hp in qualifying configuration, which was competitive but not dominant. Pirelli rubber didn’t help matters either.
Nevertheless, Senna qualified 16th for his debut in Brazil, retired on lap eight with a blown turbocharger, then turned around and scored his first-ever World Championship point with a sixth-place finish in South Africa after damaging his front wing on the opening lap and still climbing through the field. He matched that result in Belgium. Four races in this chassis followed with DNF, 6th, 6th, and DNQ. That’s the entire résumé of TG183B-05 in period competition, and it’s enough to make it one of the most significant pieces of F1 hardware in existence.
What makes this offering particularly compelling beyond the Senna provenance is how well-preserved it remains. The original gear lever and wooden knob are still in place, the “Aryton” misspelling on the footrest (Toleman’s little typo, immortalized forever) is still there, and the car runs under a correct-spec Hart 415T with a rebuilt turbocharger and gearbox. Martin Brundle drove it at Brands Hatch in 2022 for the Sky Sports documentary The Story of Toleman as well. Believe it or not, it’s eligible for the Monaco Historic Grand Prix if the next owner wants to actually use it.
Spec Sheet
Model: 1984 Toleman TG183B, Chassis #05
Engine: Hart 415T, 1.5-liter turbocharged inline-four
Power: ~800 hp (qualifying trim)
Top Speed: 186+ mph
Gearbox: Hewland 5-speed
Suspension: Double-wishbone pull-rod (front), double-wishbone push-rod (rear)
Condition: Running, period-correct Hart engine, rebuilt turbo and transmission
Auction: RM Sotheby’s Monaco Sale, Lot 150
Sale Date: April 25, 2026
Estimate: €2,800,000 – €3,800,000 (~$3.2M–$4.3M)
Pricing & Availability
TG183B-05 crosses the block at RM Sotheby’s Monaco sale on April 25, estimated between €2.8 and €3.8 million (~$3.2M–$4.3M).
Recap
1984 Toleman TG183B-05 Ayrton Senna Auction
Senna’s very first F1 car, the 1984 Toleman TG183B chassis 05, is heading to auction at RM Sotheby’s Monaco sale on April 25th with an estimate of ~$3.2–$4.3 million. It’s the car he debuted in, scored his first championship points in, and it still runs.
