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Questions tagged [gear-ratio]

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Transmission Slipping, Mechanic Claims it needs re-build, then it suddenly starts working again - 2000 Nissan Xterra

The transmission on my 2000 Nissan Xterra with 114,000 miles randomly started slipping one day. It does seem to be slipping somewhat in all gears, but it's most prominent in 2nd and 3rd. If I keep ...
Josh Zeldin's user avatar
0 votes
0 answers
38 views

Do transmission drive gears slide onto a keyed/splined shaft for manual transmissions, or is the entire piece one unit?

So this is obviously a "one size fits most" question, and my actual real world use case may not represent the answers I get here, but I'm curious. I'm looking at doing an electric motor swap ...
Sidney's user avatar
  • 1,090
3 votes
1 answer
1k views

Why does the wheel size affect the cars gearing?

Using online gearing top speed calculators I realized that the bigger the diameter of the wheels, the higher the theoretical gearing top speed is. Why is that? Why does bigger wheel act as increasing ...
Timothy Scherer's user avatar
2 votes
1 answer
770 views

Does increasing final drive ratio actually improve overall acceleration?

Hopefully, this is the correct forum to ask this. There's lots of stuff online about final drive ratios, but not much with respect to actual acceleration times, and usually it's just anecdotal, butt-...
bertmoog's user avatar
  • 123
6 votes
5 answers
9k views

Does an increase in horsepower allow a greater speed in any given gear?

I wasn't sure if this was the best place to post this, or if I should go post it in the physics stackexchange as well. I can crosspost if this question would be more fitting over there. To put this ...
Baylor Norris's user avatar
1 vote
1 answer
2k views

Is the 2KD engine manual gearbox compatible with a 1KD?

The car is a Hilux Vigo 4WD , manual transmission. Can I use a manual 5-gear gearbox that is designed for a 2.4L (2KD) engine with a 1KD 3.0L engine? A duplicate post of this question : https://...
mykey's user avatar
  • 121
-1 votes
1 answer
2k views

Tire and drive shaft revolutions near equal?

Obviously if you have a front wheel drive it is the same. When a rear wheel drive car makes 1 tire revolution while driving how many revolutions does your drive shaft make? Are driveshafts mistaken ...
user avatar
2 votes
0 answers
965 views

is primary drive ratio included within the gear ratio specs?

Is primary drive ratio normally included into the gearbox ratio specification, or should it be considered as a sum of the two to get the true ratio? Lets take a modern BMW motorcycle engine as an ...
FlegmatoidZoid's user avatar
5 votes
1 answer
2k views

Why can a motorcycle rev higher than a car, in spite of both reaching the same speed?

Basically, a car (street legal 2.5L) has about 7k RPM on its tachometer and a Motorcycle has about 14k RPM. Why is there a difference? Is there any relation between the displacement of the engine ...
BraveNinja's user avatar
14 votes
1 answer
7k views

Is reverse gear in a manual transmission equivalent to any other gear?

Question is pretty well summarized in the title. If we were to order gears in terms of power provided, where would reverse fall between gears 1-5 on a manual transmission vehicle? Does it vary by ...
CaptainCalvert's user avatar
4 votes
2 answers
1k views

Why after a certain RPM with the same gear selected the car no longer accelerates?

I have basic understanding of gearboxes and why we use them, but what is baffling me is that after about 4000 RPM (at least in my car) it doesn't accelerate further (or it does slowly)... This seems ...
Vagelism22678's user avatar
12 votes
4 answers
99k views

Optimal RPM range for manual transmission

Are there optimal RPM ranges for different vehicles? I've been told it's better for the engine to drive at slightly higher RPMs (e.g. 2500-3000 for my Tacoma) than low (1000-1500). I understand a ...
amphibient's user avatar
  • 6,663
8 votes
1 answer
959 views

How come gears don’t normally change in an automatic car?

I know that there is a similar question here, and another one here that asks when an automatic gearbox knows how to change gear, but I want to know exactly how it does that. It was brought to my ...
Max Goodridge's user avatar
15 votes
4 answers
8k views

Why do 5 and 6-speed transmissions typically need different gear ratios?

My 2013 Subaru WRX has a 5-speed manual, and I long for it to have a 6th gear when cruising on the highway. A friend has a 2012 Subaru STI with a 6-speed manual, and I noticed his car runs through ...
Trevor D's user avatar
  • 1,193
2 votes
2 answers
813 views

Transmission replacement and changing gear ratios

I have 1998 Dodge Durango. It's a 4x4 5.9L v8. I'm looking at replacing the transmission and seeing as I don't really need 4wd in the city, I'd like to get better fuel economy and better acceleration. ...
Andrew Graham's user avatar
1 vote
2 answers
3k views

Why my bike shows petrol missing before 2000 RPM in all gears?

I am using Hero Karizma R (225cc, 5 gears). Recently I feel a missing in all gear befor 2000 RPM. Sometimes my bike turn off due to this missing. Usually it happens at 1st/2nd gears. After 2000 RPM ...
kannan's user avatar
  • 111
1 vote
1 answer
2k views

What is the redline for different gears for Peugeot 107 2005 model?

I have a Peugeot 107 which is a 1 liter engine car. I was wondering what is the maximum safe speed at different gears? The car starts to make a lot of noise in 1st and 2nd gear, even at 10 mph at ...
BhupinderTube's user avatar