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Originally Posted by ian beckett
The first race of the '77 IMSA season was indeed at the Daytona 24 hours and Hobbs together with Ronnie Peterson and Sam Posey drove the car but retired. In Jeremy Walton's Unbeatable BMW book a photo caption does state that the turbo engine made its debut at round three-Atlanta and the 1978 IMSA yearbook states that at Daytona the car ran with a standard 2 litre motor which left it way behind the turbocharged Porsches. This lack of power seems to have accelerated BMW's decision to go down the turbo route themselves some time before they did so in Europe. In the US,Mclaren Engines prepared the motors while factory built units were used elsewhere.
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Correct, it was the atmo engine at Daytona and Sebring.