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    Cruising RPM

    I am relatively new to driving 911s. Although I have driven manual transmissions most of my life, I am curious as to what RPM those of you who are experienced, try to keep the car at while driving.

    Re: Cruising RPM

    What I learned from my BMW with SMG on "automatic" is the computer often selects an RPM value much lower than I would have chosen on my own. So I guess my (our) fears of lugging the engine have caused us to assume a much higher than necessary RPM is needed for level-road cruising with a manual.

    Getting to 100k without a rebuild notwithstanding, I'd say it's personal preference what RPM you choose when cruising because, unless the thing is OBVIOUSLY chugging and lugging, you can't hurt our engines, you can only hurt gas mileage.

    Re: Cruising RPM

    For cruising, the lowest RPM that will still produce the needed power.

    Stephen

    Re: Cruising RPM

    Keep it around 3000. Anything less and you'll be disappointed when you want to get some power out of it.

    Re: Cruising RPM

    I knew someone was going to say that. If one can double-clutch then this isn't a problem as the downshift can be almost instant. Sometimes you want even more than 3000 RPM so the forumla of keeping it at that RPM isn't always ideal. So I'll often trundle along in 6th in trafic and then double-cluch into 2nd for a quick pass.

    Stephen

    Re: Cruising RPM

    4,000 in 6th

    Re: Cruising RPM

    LOL, yep, that's about right.

    Re: Cruising RPM

    Double clutching is for non-synchronized gearboxes. The 911 (as almost all modern cars are) is fully synchronized. Why are you bothering to clutch twice??

    Re: Cruising RPM

    Quote:
    69bossnine said:
    Double clutching is for non-synchronized gearboxes. The 911 (as almost all modern cars are) is fully synchronized. Why are you bothering to clutch twice??



    Thats what I thought , thats truck "Crash Box" talk..

    throt..

    Re: Cruising RPM

    Quote:
    69bossnine said:
    Double clutching is for non-synchronized gearboxes. The 911 (as almost all modern cars are) is fully synchronized. Why are you bothering to clutch twice??



    Because I can shift faster from 6th to 2nd for a pass if I use the engine to spin up the transmission than I can if I use the syncros to spin up the transmission. And obviously doing so places less wear on those syncros.

    What's more, I can release the clutch faster when re-engaging the engine and transmission because I've already spun up the engine from the double-clutching I just did to get the transmission spun up. So I know that the engine is rev-matched to the transmission speed.

    The end result is a much faster and smoother downshift. Smoothness is important because it is less likely to unsettle the car.

    Stephen

    Re: Cruising RPM

    i keep it at 3K or above, but if i'm just cruising for a LONG distance and there's zero traffic, I keep it at the highest gear possible.

    Re: Cruising RPM

    3K

    Re: Cruising RPM

    Should ask a Tip guy what RPMs the computer does in auto. That would help. Probably being used to less powerful engines I bet guys are all over revving about 500-1000 rpm with manuals.

     
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