Engine RPM at 120kph (75mph) on E320
07-14-2009, 04:39 AM
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E320
Engine RPM at 120kph (75mph) on E320
Hey guys, what engine RPM are you getting when you're driving at 120kph (75mph) on your 320E/E320? I am getting 3000RPM on my tach. But when I use this engine RPM calculator Engine RPM Calculator , to calculate engine RPM using a differential ratio of 2.65, a final gear of 1.00 and a tire height of 24.98in (195/65/15) at 120kph (75mph), it's coming out to 2673RPM.
Where's the discrepancy? I am running 225/50/16 (24.85in) tires in the back but even with that my RPM should be at 2687 at 75mph according to the calculator. I have a 1993 Japanese 320E/E320, but didn't all sedans come with a 2.65 rear end?
I want to change my rear differential with a shorter ratio but am trying to calculate what my engine RPM will be at highway speeds.
Where's the discrepancy? I am running 225/50/16 (24.85in) tires in the back but even with that my RPM should be at 2687 at 75mph according to the calculator. I have a 1993 Japanese 320E/E320, but didn't all sedans come with a 2.65 rear end?
I want to change my rear differential with a shorter ratio but am trying to calculate what my engine RPM will be at highway speeds.
