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The Lotus 98t was a development of the Lotus 97t of 1985. Of the four chassis built three were assigned to Ayrton Senna, now in his second year with team lotus, and one to team mate Johnny Dumfries.
Designed by Gérard Ducarouge and martin ogilvie the chassis featured a lower monocoque than the 97t as a result of a regulation change stipulating a reduction in fuel capacity to 195 litres. The powertrain consisted of the new Renault ef15b turbo v6 engine driving through a six speed hewland gearbox.
