Question about 2002 Nissan Altima

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Stick shift # Automatic RPM

Let me try my question again, i have a 2002 stick shift/ 5 speed Nissan Altima, , when i am at 5th gear and if i drive at 75 mph or higher the RPM gets to the 3000 mark and does not level out even if i maintain that speed, if i go faster the rpm increases, this happens only when on fifth gear, i was told that RPM should always level betwen 2000 and 3000 mark, i don't know if that's true. By contrast my wife has a 2005 toyota camry automatic, and the RPM on her car always levels at the 2500 mark, even when we drive at 80 mph, so does it have to do with a difference between stick shift and automatic engines or does my Nissan Altima have a problem? thank you.

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The gear ratios on a manual transmission are fixed, that's why it's a manual. If you get 3000 rpm at 75 mph, that means you will see 3200 rpm at 80 mph, 3400 rpm at 85 mph, etc. The two quantities are directly proportional, a fixed ratio for each gear. You would get a lower rpm with a 6-speed manual but still it's a fixed ratio.

On a car with automatic transmission, it can be more complicated. Most transmissions nowadays have various "overdrive" modes that keep the rpm low if you're going steady at a high speed. Some even have continuous gear ratios, so it's hard to say "what gear" you are really in. In general, the rpm will be lower on the highway with an automatic and that's normal.

Posted on Mar 09, 2009

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That is normal,If you do the same speed in 4th gear the rpm's will almost double.

The rpm's will repond faster in a manual than an automatic.

In a manual the engine supplies the power required directly to the gear that you have selected thus the engine rpm's will increase or decrease as needed.

Posted on Jan 07, 2009

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