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  #1 (permalink)  
Old 04-20-2006, 06:07 PM
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Engine RPM Comparison at Highway Speeds w/MT and AT

Congrats to all Fit owners. Can you provide info on the engine rpms you see at highway speeds (e.g. 80mph); MT vs. AT?
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Old 04-21-2006, 09:04 AM
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MT--40 MPH at 2,000, 80 MPH - 4,000
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Old 04-21-2006, 09:30 AM
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Yikes, 4k rpm at 80mph? This is in 5th?

The AT has different ratios right, so shouldn't it be able to cruise at somewhat lower rpm?

I mean, there's always the option of a custom-cut 5th gear, but....ugh, I don't want to contemplate what that would cost.
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Old 04-21-2006, 09:38 AM
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Mathematically, based on ratio's, tire size, etc:

MT @ 80 mph = 3730 rpm
AT @ 80 mph = 2880 rpm

While there are other factors that come into play (tire deflection at the bottom which causes ACTUAL rpm to be greater than mathematical, like is said with gas mileage figure - use for comparison only.

I drove a MT Fit last night, and 4K rpm at 80 mph should be somewhat accurate - depending on the accuracy of the speedo and tach.

Therefore, AT @ 80 mph would probably realize a real world approximate of 3000 rpm.
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Old 04-21-2006, 09:54 AM
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its a problem

Yeah, thats in 5 th. Pretty wierd Heh.
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Old 04-21-2006, 10:56 AM
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It's not that weird.

Think about it. The Sport MT has cruise control, right?

The Fit is the least powerful vehicle in Honda's lineup.

Depending on where you live, the interstates may contain some serious hill/mountains if you are along the Rocky Mtn or Appalacian Range. With these conditions, the Fit needs to be able to main a set speed in 5th gear with the MT, since it doesn't shift automatically, like the AT (no pun intended) does.

The AT will downshift as the speed drops with the cruise on, so there is not much of an issue there. It can have less rpm - meaning less power, and simply shift when needed to maintain an appropriate speed.

The MT Fit simply has to be in the power band, meaning higher revs, to maintain its speed on an upward incline.
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Old 04-21-2006, 11:16 AM
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Why would you rev the car so high for 99.99% of the time when you are not going up a steep hill. I have driven a Corolla (1989) with 74 hp that turned about 2300 rpm at 60. It had cruise and it was not a problem.

If cruise can not take you up a hill in a really tall gear it will let the car slow down 5-10 mph and then it will cut out. You will have hit the clutch and downshifted before then anyway. It is a manual, and is made for shifting, so what is the huge problem with the extremely occasional shift on the highway.
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Old 04-21-2006, 11:32 AM
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If you lived in an area where there were hills you would understand.

I'm in Western KY, where there isn't much of a problem; however, when I travel to the eastern part of the state, the hills/mountains are significant. You go down one and right back up another - cruise would be useless in the manner that you describe.

For example, if I were to drive from my home to Washington, DC, then I would be without cruise for over half of the trip while going through northern WV, and western MD.

I had a '99 CR-V, and it had a 4-speed AT, 146 hp 2.0L engine. It typically shifted down to 3rd going up an incline on a regular basis doing just normal driving around 75 mph. In western MD, there was a very steep incline for several miles, where it actually downshift to 2nd gear!!! Now, being fair, the vehicle was very heavily loaded, which is another thing to take into account.

Just food for thought.
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Old 04-21-2006, 12:34 PM
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On really steep hills you still may need to downshift even with the high revving engine.

Besides the base does not even have cruise - why does it need to rev so high?

My Integra is a little heavier and more powerfull than the Fit, and has a similar (though slightly better) power to weight ratio. It also revs about the same as the Fit, yet I still have to downshift on the steepest hills. If I have to downshift anyway, why not be relexed the rest of the time?

The engine revs are what I like least about the Integra, and I fear the Fit would be the same. That does not mean I won't buy it - other cars have worse problems.
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Old 04-21-2006, 12:34 PM
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The idea of a manual is that if you come to a big hill you downshift, The Basic does not have cruise, why not have reasonable gearing setup that would allow good gas mileage ?
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80, automatic, b21, comparison, fit, freeway, highway, honda, mph, mt, normal, rpm, rpms, size, speeds, tire

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