Hmm, optimum for what? Best gas mileage? Quickest from point A to point B? Not getting a ticket from the local constabulary? . For tradeoff between fuel economy and speed, I think the engine is happy around 2000rpm (didn't say it was the most fun). You can dial up the instantaneous consumption to measure. Of course, it is more fun to drive the car at the engine torque peak of 3800 in 6th gear!! :cheers:Hector Lopez said:I am new to the M5, as well as 6 speeds. I was wondering what the optimal cruising RPM(freeway) is for our cars. :wroom:
Hector,Hector Lopez said:at steady rpm's for a long drive, where is the car the happiest, and running most efficiently?
Mattmatt310 said:Hey gsfent, I just bought my car from a place in west palm and had it shipped out to los angeles - nice area you guys have down there!
is this true? i've been meaning to post regarding this.gsfent said:Clearly, the slowest rpm makes the car cruise most "efficiently".
I used to think there is and had the same debate, especially with lower powered small engine turbo cars where you could run the engine so slow as to make it lug and thereby I assumed be less efficient. I saw a letter one or two issues ago in Roundel and the consensus from the pro's was that efficiency (here we are talking about fuel efficiency) was directly related to rpm. As a test, set the cruise at say 80 mph on level ground, and then run for 10 minutes or so in 5th gear after resetting the fuel consumption. Then do the same run in 6th. I am willing to bet that mileage improves in 6th. Same result at 60mph. But at say 40 mph, you are probably lugging the engine so I don't think any fuel efficiency is worth the strain on the engine.SpiderSense said:is this true? i've been meaning to post regarding this.
assuming level ground, no air resistance, etc, etc... which is more efficient?
cruising at a constant 70mph at 3000rpm in 5th gear, or 2300rpm in 6th gear?
sometimes i feel like 2300rpm is low and makes the engine less efficient. (of course, there is always enough power in the M5). or maybe i feel this way because the ground is not level and 3000rpm is more efficient to overcome this.
i guess the question is - is there an "efficient rpm band" for an engine? i think there is.