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Questions tagged [gear-ratio]

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7
votes
5answers
5k 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 ...
1
vote
1answer
535 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://...
-1
votes
1answer
481 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 ...
2
votes
0answers
426 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 ...
5
votes
1answer
775 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 ...
14
votes
1answer
3k 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 ...
4
votes
2answers
872 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 ...
11
votes
4answers
79k 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 ...
8
votes
1answer
813 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 ...
15
votes
4answers
7k 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 ...
2
votes
2answers
541 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. ...
1
vote
2answers
2k 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 ...
1
vote
1answer
1k 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 ...