However, rules then also specified that the cars were to be weighed filled with their usual fluids. In 1982, other teams (chiefly Brabham and Williams) had used this provision to develop cars with features such as 'water-cooled brakes' – the car officially started the race with a large, full water tank, the water was released in the general direction of the brakes and the car ran underweight when on track and unable to be weighed, only to be later topped up sufficient water to ensure the weight limit was not breached. As Tyrrell was the only naturally aspirated engine user in 1984 season, they were uniquely placed to be able to benefit from a similar strategy of the water brake. In Tyrrell's case, the engine was equipped with a water injection system (a common means of lowering cylinder temperatures to increase power), whose supply tank was to be topped up late in the race. In addition, the FIA had already made provision to reduce the fuel allowance for each race during the season to 220 litres and banned the refueling of 1982–83, reducing the power available to turbocharged runners while imposing little restriction on more efficient non-turbo runners. Predictably turbo-powered teams were against this move, leaving only Tyrrell – whose engine did not need the additional fuel – in favour of it. However, F1 rules required unanimity for the change to be scrapped, leaving Tyrrell in the way. It had been observed in races that, after Tyrrell's final pit stop, lead shot could be seen escaping from the top of the car. It turned out that Tyrrell were running the car underweight during the race then, in the closing stages, topping up water injection supply tanks with an additional 2 gallons of water mixed with 140 lb of lead shot to ensure it made the weight limit. As this was pumped in under significant pressure, some escaped through the tank vent and rained down on neighbouring pits, in sufficient quantities for other teams to sweep the shot away before their drivers pitted. After the Detroit Grand Prix where Martin Brundle had finished in second for Tyrrell, the top cars were, as usual, impounded for inspection for compliance with the rules. Following this, it was alleged that the water was in fact 27.5% aromatics and constituted an additional fuel source. Tyrrell were thus charged with:  As a consequence of these charges, Tyrrell were excluded from the 1984 world championship and retroactively disqualified from all races that year. Further analysis showed that the actual fuel content of the water was significantly below 1% and well within rules.