How come 2009 Fit mileage has decreased?

[Arisenfury]

Have you ever ridden a bike before? Think of how fast you can get the Bike up to speed if you start in the highest gear on the bike. Your feet are moving very slow to get the wheel to make one revolution. Once you get up to speed though the higher gear makes maintaining the speed much easier. Now think about starting in a low gear and going up to speed shifting the gears of the bike, you get there faster and with less strain. Now once you're at speed downshift the bike to the next gear or two down and pedal the bike so that it's still applying torque to the wheel to keep it moving at the speed you're going. It's going to take a lot more work and your feet are going to move much faster than with the taller gear. This same principle works for the gears of a car.

[jenhonski]

Originally Posted by niko3257

the gear ratios have changed for manuals in 09
thus making the auto have more MPG

do a search on gear ratios
this has been discussed before. i even posted
a thread with actual speeds and rpms for both
mt and at trannys

niko3257 can you give me a little more info? I did a few searches but I couldn't find where you give actual RPMs. Did you list 08 ratios alongside 09 ratios?

2008 Honda Fit ratios are not the same between MT and AT. The MT 2008 has higher ratios than the 2008 AT. Futhermore, the 2009 Fit ratios are the same or less than the 2008 Fit (except for "Final Drive"). What is "Final Drive"?

[IfTheFoo]

Originally Posted by jenhonski

That sucks!

What's the advantage of higher rpms--just more torque? What exactly does this increased torque do for the driver?

Jenhonski, I'd encourage you to look some of this stuff up using search tools like google and wikipedia. You are asking lots of interesting questions, but please stop relying on someone to answer ALL of them for you. You've obviously got a 'net connection, well, the answers to a lot of "generic" questions (like torque, etc) can be found online. Not so with the '09 Fit in most cases - a lotta times we Fitfreaks ARE the answer since this is a new vehicle.. Not wanting to rag on you or anything, pls don't take it that way. Knowledge is a good thing! Curiosity is the next best thing. (OK that's hokey)

[jenhonski]

Originally Posted by Arisenfury

Have you ever ridden a bike before? Think of how fast you can get the Bike up to speed if you start in the highest gear on the bike. Your feet are moving very slow to get the wheel to make one revolution. Once you get up to speed though the higher gear makes maintaining the speed much easier. Now think about starting in a low gear and going up to speed shifting the gears of the bike, you get there faster and with less strain. Now once you're at speed downshift the bike to the next gear or two down and pedal the bike so that it's still applying torque to the wheel to keep it moving at the speed you're going. It's going to take a lot more work and your feet are going to move much faster than with the taller gear. This same principle works for the gears of a car.

Oh, thank you so much for explaining that

[jenhonski]

Originally Posted by IfTheFoo

Jenhonski, I'd encourage you to look some of this stuff up using search tools like google and wikipedia. You are asking lots of interesting questions, but please stop relying on someone to answer ALL of them for you. You've obviously got a 'net connection, well, the answers to a lot of "generic" questions (like torque, etc) can be found online. Not so with the '09 Fit in most cases - a lotta times we Fitfreaks ARE the answer since this is a new vehicle.. Not wanting to rag on you or anything, pls don't take it that way. Knowledge is a good thing! Curiosity is the next best thing. (OK that's hokey)

Sorry

I was thinking there was a specific reason for more torque related specifically to the Fit.

[niko3257]

Originally Posted by jenhonski

niko3257 can you give me a little more info? I did a few searches but I couldn't find where you give actual RPMs. Did you list 08 ratios alongside 09 ratios?

2008 Honda Fit ratios are not the same between MT and AT. The MT 2008 has higher ratios than the 2008 AT. Futhermore, the 2009 Fit ratios are the same or less than the 2008 Fit (except for "Final Drive"). What is "Final Drive"?

2009 Fit RPM's must look


http://www.fitfreak.net/forums/eco-f...9-fit-rpm.html


these are 2 threads on rpms and i think there is more but
i'm to lazy to search for more.
just look around you'll find all you need.
but if your really that worried get the auto and play it
safe.
i love my auto.

[IfTheFoo]

Originally Posted by jenhonski

Sorry

I was thinking there was a specific reason for more torque related specifically to the Fit.

No prob, it's all good.

[mahout]

Originally Posted by jenhonski

niko3257 can you give me a little more info? I did a few searches but I couldn't find where you give actual RPMs. Did you list 08 ratios alongside 09 ratios?

2008 Honda Fit ratios are not the same between MT and AT. The MT 2008 has higher ratios than the 2008 AT. Futhermore, the 2009 Fit ratios are the same or less than the 2008 Fit (except for "Final Drive"). What is "Final Drive"?

gear transmission final axle gear overall ratio

1st 3.308(2.996) 4.62(4.56) 15.28(13.66)
2nd 1.87(1.679) 4.62(4.56) 8.64(7.656)
3rd 1.303(1.067) 4.62(4.56) 6.02(4.86)
4th .949(.761) 4.62(4.56) 4.38(3.47)
5th .727(.552) 4.62(4.56) 3.359(2.51)

A vehicle generally has 2 means of reducing engine rpm to the rpm needed by wheels to cover ground. The first is the transmission which has several sets of gears selected by the driver (manual) or a computer (automatic), and the final drive which is a single hypoid gear between the transmission and the wheels that turn the rotation 90 degrees from engine to wheels. That gear doesn't change ratios conventionally.
The gear down from roghly 14:1 to 3:1 is necessary to let the wheels turn at say 600 rpm at 60 mph in fifth and 600 rpm at 20 in first.
The lower the ratio overall the less engine rpm is needed at any given speed. The automatic overall ratio is 2.51 to 1 compared to the manuals 3.36, which means at 6000 rpm the automatic would be able to go 180 mph and of course the horsepower required to move that much air out of the way is far beyond what the Fit engine has. The manual could reach 133 and can reach 115 mph.
We have tested both manuals and automatics and indeed can show the manual about 10 mph faster than the automatic.
However, since the automatic at 60 mph is turning the engine only 2200 rpm and the manual 2800 rpm at 60 mph, the automatic gets better gas mileage because the cylinders fill with fuel-air mixture much more often in the manual. The more times you fill the cylinders per mi traveled the more fuel you burn. But the of course the manual accelerates more rapidly and can reach higher speeds eventually.
PS torque is how much turning force is on a wheel; acceleration
horsepower is how much force turns the wheel per minute: top speed.

[ccaddy]

Lighter vehicles get better mileage .
The auto may weigh less (I haven't checked) then the 5 speed
due to it's replacing the spare with a pump and can of sealant (?)

- Craig

[FiveFreshFish]

Originally Posted by ccaddy

Lighter vehicles get better mileage .
The auto may weigh less (I haven't checked) then the 5 speed
due to it's replacing the spare with a pump and can of sealant (?)

- Craig

The AT still weighs more, despite the repair kit.

Canadian weights (MT/AT) in kg from honda.ca:

DX - 1119/1151

LX - 1131/1163

Sport - 1147/1176