E46Fanatics - View Single Post - **3.91 Diff Swap: Everything you need to know!!!**
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Old 08-22-2009, 06:11 AM   #209
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Join Date: Jul 2009
Location: Dublin Ire
Posts: 30
My Ride: 318CI
Originally Posted by Alex323Ci View Post
well you might use more gas trying to get your 318 up to speed in city driving. but when it is on the highway and cruising flat, yes a lower diff ratio should help your gas mileage(as long as your car's engine isn't too far out of it's best powerband).
So if i was to get the ECU chipped or mapped to bring the power band down would this help the car pull better on highways when you go to over take someone, instead of it taking too long,and pulling away from the lights in the city or would this just be pointless cause it would be canceling out the purpose of changing the diff in the first place? If you get me!
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