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- Q172534 subject Q7754625.
- Q172534 abstract "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.The EF15B was to appear in two forms, the standard engine and the "D.P." engine which featured pneumatic valve springs for the first time. At the end of the season Renault introduced the revised EF15C which in addition to the D.P. valve gear also boasted common rail fuel injection and much revised water cooling through the cylinder head reducing the likelihood of pre-ignition (detonation). Power figures for this period of F1 history are largely speculative as most engine manufactures freely admitted that their test beds would not have a sufficient power rating to measure the 1.5 litre turbos output at above 4 bar boost. It is claimed that the Renault EF15 in its pinnacle increment produced between 700 bhp (520 kW) and 900 bhp (670 kW) at 5.5 bar boost, thus making it one of the most powerful engines ever used in Formula-1 racing. The 98T was the final Lotus powered by a Renault engine, as Lotus switched to Honda for the following year/season.The gearbox came in two variants, a conventional five speed and a new six speed. The six speed was very much a development gearbox and was largely unreliable. While Senna opted to run only with the five speed, Dumfries was tasked with testing the six speed. Both gearboxes featured Hewland internals within a Lotus designed casing.Other notable innovations of the 98T included a two-stage ride height adjustment, water injection through the intercoolers, an early form of barge board (also present on the 97T) and an advanced (for the time) fuel consumption micro computer.During the 1986 Formula One season, the Formula One paddock was very much alive with speculation as to the legality of the Lotus 98T. The increasing rumours prompted Lotus team manager Peter Warr to issue a press statement after qualifying for the German Grand Prix, calling for the rumours to stop or for the teams to officially protest the car. While the rumours died down, they did persist, although no protest was ever lodged.".
- Q172534 thumbnail Senna_Brands_1986.jpg?width=300.
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- Q172534 comment "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.".
- Q172534 label "Lotus 98T".
- Q172534 depiction Senna_Brands_1986.jpg.