I do 3-4 hour drives every weekend on the AUTOBAHN!!! 2500RPM is nothin'! I like to cruise at 120 which is a comfortable 2600RPM in the Corvette (gotta love .5:1 6th gear w/ 3.42 rears), but nearly flat out in the 318i at about 5500-6000RPM. Takes it like a champ. I've put over 120k km on my 318 in the 3.5 years I've been doing this.On the hwy, those 3.55's are darn close to 2400rpm around 70mph, that 5% would put it overboard for me on the hwy, 2500+ Plus rpms would suck b@lls, people who do hwy driving KNOW what i'm saying
ps. by the way, if I'm right about the tire you're running, your tach is off - kinda normal if you're running a stocker. 25.6" OD tire with a .675:1 5th gear, and 3.55:1 rear end should be doing right at 2200 rpm at 70mph. A 25.6" OD tire would be consistent with a 225/60/15, a 245/50/16, or a 275/40/17. It would take a VERY small 23.5" tire for that gearing to get up to 2400 RPM.
I guess my reference point was my '03 GT. It had 3.27s and I loved them. Different power and and engine rpm limit of course, but being at 80mPH at 3k rpm in 4th was perfect for rolling on the throttle and zipping along. You could then ride that gear to 100MPh at the track. If I needed to cruise, 5th gear was just over 2k rpm.
With my 3.73s, It just feels like too much
Persona opinion of course
Honestly, I probably wouldn't do it in a daily driver, anymore. I've grown too used to lugging along where the engine is barely audible and getting 30+ mpg. It's pretty nice. It's what has me really wanting a .5:1 OD. Then I can keep the gears and have my fuel mileage, too.
Here's kind of a cool fact I just uncovered. The final drive ratio of a 2.73 rear with a T5 (.675:1 OD) is almost identical to a 3.73 with a T56 (.5:1 OD).
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