According to the manufacturer top speed was and took 6.3 seconds. In June 1986 Italian automobile magazine Quattroruote published a comparison test between a 328 GTS and a GTS Turbo. Despite the differences between the former's more powerful 32-valve atmospheric engine and the latter's torquier but peakier turbocharged 16-valve engine, performance was found to be quite similar in both acceleration and top speed. The Turbo sprinted from 0 to 100 km/h in 6.6 seconds (a tenth of a second behind the 328) and covered the standing kilometre in 24.6 seconds, two tenths behind the 328. Quattroruote recorded a top speed of .