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Discussion Starter · #1 ·
With my 5-speed I do alot of highway driving and the 5-speed seems to rev quite a bit higher than I am used to. I talked to the dealer and they said it is normal for a 4 cyl to rev high. Anyone else have any concerns or ideas on this?
 

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What do you consider High and at what speed ? At 55 mph you should be @ 2000 in 5th gear and at 75mph it should be just at 2900-3000 rpm. Take into account that the engine redlines at 6500 anything lower should be cake for the engine. However I would agree that the gear box could use a 6th gear with the addition of around 25ft lbs more torque.
 

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Discussion Starter · #3 ·
At 70 MPH I am right at 3K on the tach. I often run the car about 75-80 just to keep up with traffic. I think 80MPG was just below 3500 RPMs. I know in my last car 5-speed V-6, I was only at 2600 RPMs at 80MPH.
 

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Hell, I had a Trans Am that ran 1900 rpm's at 75mph. I might be wrong, but generally the smaller the engine, the more the RPMs I believe.
 

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My car runs at about 3000 rpm at 70. I think I read the auto trans run around 2400 rpm. Is that correct?
 

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[quote author=whatup link=topic=54964.msg911240#msg911240 date=1156448126]
My car runs at about 3000 rpm at 70.  I think I read the auto trans run around 2400 rpm.  Is that correct?
[/quote]

For the I-4, you are correct.
 

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[quote author=ROBERTB link=topic=54964.msg908988#msg908988 date=1156368125]
Hell, I had a Trans Am that ran 1900 rpm's at 75mph. I might be wrong, but generally the smaller the engine, the more the RPMs I believe.
[/quote]

Gearing matters more than the engine, though the engine matters because a smaller engine needs to rev higher to put out enough power.
 

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The I-4 Manual generates way more revs than required to maintain highway cruising speeds in 5th gear. The long-stroke 2.3 is pretty torquey above 2000 rpm, but the stock gearing seems more fitting for a 1.6L engine. The manual could easily handle a 600 rpm drop in top gear on the hwy. You can be in 5th at 35 mph and pull down some increadible mpg figures at those lower speeds, but when setting the cruise control to 80 you will be lucky to break 30 mpg. 36 mpg is possible at speeds below 60.
 

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Discussion Starter · #10 ·
sounds about right to me. How can we get a better gear ratio for the 5-speed tranny? I would like to see about 2300-2400 RPM at 70MPH.
 

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all my 4's have been around 2500 to 3500 r's, on highway / freeway driving

3500 on my 1.6L 4 speed man Chevette, and around 2500 - 3000 on the autos
and of course my 6's & 8's were well lower. it's normal.
 

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Yep, perfectly normal. You should hear the racket some 4 cyl cars make when cruising 80 MPH - the Fusion is quite quiet compared to them. 4 banger/manual tranny cars are typically geared so that if someone punches it in top gear it won't strain/lug the motor. An automatic will obviously downshift and because of that allows the use of steeper gearing (lower numerically) which results in lower engine rpm. As usual, it's always tradeoffs.
 
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