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- - Manual overdrive? (https://www.mazda3club.com/3rd-gen-engine-drivetrain-57/manual-overdrive-31179/)

jnorion

September-14th-2003 03:55 PM

Manual overdrive?

The owner's manual for my 2003 lx says I have a "manual overdrive transmission." What is it and how does overdrive work in a manual... or did someone print something wrong?

midnightblue97

September-14th-2003 04:46 PM

fifth gear is an "overdrive" ratio

jnorion

September-15th-2003 01:28 AM

What's the difference between that and a normal fifth gear?

Astral

September-15th-2003 04:46 PM

No difference. Fifth gear is just called overdrive because the gear ratio is less than 1. All other gears have ratios >1, so it takes more than 1 revolution of the engine to rotate the crankshaft once (??? uhh i've no idea what the term is). In fifth gear, it takes less than one revolution of the engine to rotate the crankshaft once, hence the "over"drive (whereas the fourth gear is more like "drive" and all others are more like "under"drive)

midnightblue97

September-15th-2003 06:42 PM

Quote:

Originally posted by Astral
No difference. Fifth gear is just called overdrive because the gear ratio is less than 1. All other gears have ratios >1, so it takes more than 1 revolution of the engine to rotate the crankshaft once (??? uhh i've no idea what the term is). In fifth gear, it takes less than one revolution of the engine to rotate the crankshaft once, hence the "over"drive (whereas the fourth gear is more like "drive" and all others are more like "under"drive)

Thats a pretty good explanation.
though 4th gear, assuming its 1:1 would be called "direct drive"

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