By 1955, Mercedes-Benz Technical Director Prof. Fritz Nallinger and his team held no illusions regarding the 190 SL's lack of performance, while the high price tag of the legendary 300 SL supercar kept it elusive for all but the most affluent buyers. Thus Mercedes-Benz started evolving the 190 SL on a new platform, model code W127, with a fuel-injected 2.2 liter M127 inline-six engine, internally denoted as 220SL. Encouraged by positive test results, Nallinger proposed that the 220SL be placed in the Mercedes-Benz program, with production commencing in July 1957.