That is very dependent on the car. My car climbs hills most efficiently in 5th gear at 30mph. If it had a 6th gear it would probably climb hills fine in 6th gear at 35.fa22raptorf22 wrote:Also, it is very inefficient to climb a hill in high gear at low speed (IE 6th gear at 30mph)
Let's define a few things, then:kanine wrote:I just wanted to make sure running RPMs low isn't the same as lugging the engine or would cost any harm. I get no shuddering or notice any problems when I drive that low in the RPMs.
Low RPM - A subjective and relative term. As a concept, no problem.
Shuddering - Engine can't keep a steady RPM or car bucks/jerks.
Lugging - Severe ping/predetonation that can happen in antique engines run with heavy load at low RPM:
http://www.standardshift.com/forum/view ... 1271[quote] I'm pretty sure that most people who think they have been lugging their engine really have not been lugging it at all. I'm not even sure that modern ECUs and knock sensors would let the engine lug. My experience with the Jetta so far has been that it either runs or stalls. I have not heared it lug (even when I accidentally took a corner in 4th instead of 2nd).
Putting a load on an engine at low RPM will make it growl, but growling is not lugging. Lugging is irregular. If it growls and goes it is not lugging (at least in my understanding of the matter). [/quote]
http://www.standardshift.com/forum/view ... 2[quote]It isn't lugging. You'll never forget the sound of lugging once you do it. Sounds like a bunch of metal sh*t exploding under your hood. Or like a jackhammer. [/quote]
Low RPM: OK. Enjoy.
Growling/groaning/rumbling: OK, but not recommended.
Shuddering: Don't panic, but try to avoid it and try to end it if it happens.
Lugging: It won't happen. If it does, stomp the clutch immediately.