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Old 05-18-2009, 06:03 AM   #1
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ideal RPM

what is the ideal RPMs when shifting?

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Old 05-18-2009, 08:22 AM   #2
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For the best gas mileage, I've found that you need to shift between 2000 & 2250.

But, it would depend on your engine size, gearing, tire size, weight, etc., etc.

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Old 05-18-2009, 06:08 PM   #3
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Ideal Shift points are not determined solely by rpm. If this were true, an automatic transmission would be relatively simple in its design. You have to consider load, acceleration rate, and rpm. If for example, I am just puttin around real slow, I will shift at a realatively low rpm because I don't plan on loading the engine and it will run fine at the lower rpm in that situation. Conversely, if I am trying to race (in a Jeep!!) then I would run the rpms up to, or close to the rev-limiter. To learn when to shift is something you learn primarily with experience. Even then, you will probably have a different driving style than me and will either shift at a higher point or lower point than I do, simple because it is your style of driving. If you want power, shift at higher rpm with more skinny pedal, if you want economy, shift soon and stay off the skinny pedal.
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Old 05-18-2009, 07:57 PM   #4
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^very true.

2000-2300 is a good point for normal easy driving. you don't wanna go to low, cuz they don't like to be bogged down.
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Old 05-18-2009, 09:57 PM   #5
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I guess I generally shift somewhere between 2500 and 3000 depending on circumstances
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Old 05-18-2009, 10:02 PM   #6
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With the 4.0L and stock tires, I typically shift just slightly below or at 2k. I also have a slower speed drive to work and am normally not in a hurry.
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Old 05-18-2009, 11:28 PM   #7
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Sorry to hijack this thread but I figured, why make a separate one? What is the ideal rpm's when shifting a 2.5 4cyl? I find myself shifting at or slightly above 2,500.
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Old 05-19-2009, 12:13 AM   #8
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I have a 2000 with the 2.5 and I shift at at least 2500, and mostly find myself shifting at 3K. Is this normal with 30 inch tires?
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Old 05-19-2009, 09:58 AM   #9
Knows a couple things...

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You can't just go by rpm since what would be a good rpm for one size tire and axle ratio would lug the engine with a different size tire and axle ratio. I'd say closer to 3000 rpms typically with between 2000 and 2500 being too low to shift at unless you're driving on city streets at 25-30 mph.
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Old 05-19-2009, 03:31 PM   #10
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What do you mean by "ideal" rpm, or "ideal" time to shift ? It's up to you how fast you want to go / how high you want to rev it before shifting.

I've found with my setup (33's, stock gears, 4cyl.) that I get 50 more miles per tankful of gas if I shift between 2000 & 2200 rpm's. But that makes driving slow. I drive slow. When I drove faster I shifted between 2500 & 3000. It's faster, and I went 50 miles less per tankful.

How do you like to drive ? This is what usually determines shift rpm's.

What is best for the engine ? Probably what works the engine the least. Parts wear out faster when you work them harder.
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Old 05-19-2009, 03:54 PM   #11
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Listen to your engine, it will always tell you when it's being overburdened or under-torqued...

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