Tag: differential cooler

Running a higher diff ratio puts more pressure on the final drive. Longer race durations simply multiply that even further! Standard drive ratio for the 330Ci manual is 2.93, and we’ll be running a 3.73 after the rebuild (April 2021). This all means that the input shaft is spinning faster for the same forward speed. There are more crown teeth engaging, therefore more contact, more friction, and more heat generated. We do this to improve acceleration at the expense of outright top speed. Continue reading “e46 Differential Cooling Mod”