Max torque and gear query

[Liuz0004]

Example:

 

Car's max torque 121Nm at 3k RPM.

 

1. does this mean that revving above 3k rpm wont give me extra torque?

2. usually when cars need to overtake, they down one gear for more torque to overtake and gain speed rite?

3. if im at 5th gear, 3.2k rpm, i need to overtake, is it advisable to down to 4th gear to overtake?

[Turbonetics]

Example:

 

Car's max torque 121Nm at 3k RPM.

 

1. does this mean that revving above 3k rpm wont give me extra torque?

2. usually when cars need to overtake, they down one gear for more torque to overtake and gain speed rite?

3. if im at 5th gear, 3.2k rpm, i need to overtake, is it advisable to down to 4th gear to overtake?

 

 

1.some cars has got max torque ranging from 2k-4k rpm.

if your car's max torque is at 3k rpm,then revving further will cause your torque to drop,but that does not mean your car is slower

 

2.drop gear to overtake is to gain higher speed at a shorter time,not to achieve more torque.

 

3.yes.

[Route88]

U need a diagram like this,from there u know where ur max torque and dip torque curve at which rpm.

 

 

 

[Picanto]

Example:

 

Car's max torque 121Nm at 3k RPM.

 

1. does this mean that revving above 3k rpm wont give me extra torque?

2. usually when cars need to overtake, they down one gear for more torque to overtake and gain speed rite?

3. if im at 5th gear, 3.2k rpm, i need to overtake, is it advisable to down to 4th gear to overtake?

 

that means for every gear you are in, rev to 3k to get the maximum acceleration. of course, the car will still move if rev to 2.5k, but you will not experience maximum acceleration.

 

for everyday driving, i think rev 2 to 2.5k enough already.

[Ghostrider]

1) You rev pass 3k rpm you will not gain any more torque but depend on what max power is at too. If say your max torque is at 3k while your max bhp is at 4k...then you have to shift at 4k rpm to max your acceleration.

 

2) Again it depends on what speed (kmh) of your car and at what engine speed (rpm). If its higher speed for both, then a downshift will give you brisk acceleration. If you just floor the pedal while in a higher gear, you will still accelerate...but at a more leisure pace.

 

3) Look at my answer for (1)

 

BTW....curious...what car max its torque at 3k ?? (I only know of Rolls Royce :p)

[Nullifi3d]

1) You rev pass 3k rpm you will not gain any more torque but depend on what max power is at too. If say your max torque is at 3k while your max bhp is at 4k...then you have to shift at 4k rpm to max your acceleration.

 

2) Again it depends on what speed (kmh) of your car and at what engine speed (rpm). If its higher speed for both, then a downshift will give you brisk acceleration. If you just floor the pedal while in a higher gear, you will still accelerate...but at a more leisure pace.

 

3) Look at my answer for (1)

 

BTW....curious...what car max its torque at 3k ?? (I only know of Rolls Royce :p)

 

So basically the small bengs that ram the accelerator in arcade games like Maximum Tune are not doing it properly? They cant be achieving max torque just by putting the pedal to the floor right? Hahaha

 

[Watwheels]

U need a diagram like this,from there u know where ur max torque and dip torque curve at which rpm.

 

Good example. But not many ppl know how to see the graph. There are comparing two engines, so look at either the two curves in red or the two curves in grey.

 

There are 2 graphs combine into one but having the common variable which is the RPM.

eg KW(hp) vs RPM and Torque(N.m) vs RPM

 

The KW(hp) curve is the "inverted tick" while the other is the torque curve.

 

 

Edited January 31, 2009 by Watwheels

[Ghostrider]

Wah lau...play games is pedal to the metal....rev the nuts off the car.

 

The good driving games that I played with good character of the cars is Side By Side both 1 & 2. Its like the Initial D game...in fact it has a couple of tracks that is like the Initial D game and it even have the tune version of the AE86, RX7 FC & FD....

 

But that is also rev all the way until rev lites come on then change gear.

 

I tried some of the games not so fun....very fake.

[Nullifi3d]

Wah lau...play games is pedal to the metal....rev the nuts off the car.

 

The good driving games that I played with good character of the cars is Side By Side both 1 & 2. Its like the Initial D game...in fact it has a couple of tracks that is like the Initial D game and it even have the tune version of the AE86, RX7 FC & FD....

 

But that is also rev all the way until rev lites come on then change gear.

 

I tried some of the games not so fun....very fake.

 

I guess over a certain RPM the car will scream but you'll just be wasting petrol. Knowing the optimum torque levels to upshift would certainly help in better FC.

[Liuz0004]

1) You rev pass 3k rpm you will not gain any more torque but depend on what max power is at too. If say your max torque is at 3k while your max bhp is at 4k...then you have to shift at 4k rpm to max your acceleration.

 

2) Again it depends on what speed (kmh) of your car and at what engine speed (rpm). If its higher speed for both, then a downshift will give you brisk acceleration. If you just floor the pedal while in a higher gear, you will still accelerate...but at a more leisure pace.

 

3) Look at my answer for (1)

 

BTW....curious...what car max its torque at 3k ?? (I only know of Rolls Royce :p)

 

many cars have max torque at less than 3k rpm. cars like golf gt etc. if you are asking exactly at 3k rpm, fiat punto is one.

 

anyway im just putting an example. my car's max torque is at 4.8k rpm.

 

back to topic: lets say my max torque at 3k rpm, im on 5th gear, at 100km/h, rpm is 3.2k rpm, i need to increase speed to 120km/h to overtake FAST, shld i down gear? since im already at the max torque. what help will downshifting give?

[Watwheels]

many cars have max torque at less than 3k rpm. cars like golf gt etc. if you are asking exactly at 3k rpm, fiat punto is one.

 

anyway im just putting an example. my car's max torque is at 4.8k rpm.

 

back to topic: lets say my max torque at 3k rpm, im on 5th gear, at 100km/h, rpm is 3.2k rpm, i need to increase speed to 120km/h to overtake FAST, shld i down gear? since im already at the max torque. what help will downshifting give?

 

LOL...You have a car what. Why not give it a go and experience it for yourself?

[Ghostrider]

Downshifting in your case will yield higher bhp (assuming that your car develops max bhp at higher revs.) Your revs will climb higher in a lower gear thus getting you to the power band faster than a higher gear.

[Ghostrider]

if you just want the car to move....yes. No point shifting all at redline.

 

But if you want max acceleration, then you gotta rev all the way to the max bhp then shift.

 

(driving like dat dun need to consider FC....sure bad one.)

[Turbonetics]

many cars have max torque at less than 3k rpm. cars like golf gt etc. if you are asking exactly at 3k rpm, fiat punto is one.

 

anyway im just putting an example. my car's max torque is at 4.8k rpm.

 

back to topic: lets say my max torque at 3k rpm, im on 5th gear, at 100km/h, rpm is 3.2k rpm, i need to increase speed to 120km/h to overtake FAST, shld i down gear? since im already at the max torque. what help will downshifting give?

 

 

 

i thought answers already given?

why are you asking the same question again?

if you don't believe,you can try it yourself.

[Elfenstar]

Example:

 

Car's max torque 121Nm at 3k RPM.

 

1. does this mean that revving above 3k rpm wont give me extra torque?

2. usually when cars need to overtake, they down one gear for more torque to overtake and gain speed rite?

3. if im at 5th gear, 3.2k rpm, i need to overtake, is it advisable to down to 4th gear to overtake?

 

many cars have max torque at less than 3k rpm. cars like golf gt etc. if you are asking exactly at 3k rpm, fiat punto is one.

 

anyway im just putting an example. my car's max torque is at 4.8k rpm.

 

back to topic: lets say my max torque at 3k rpm, im on 5th gear, at 100km/h, rpm is 3.2k rpm, i need to increase speed to 120km/h to overtake FAST, shld i down gear? since im already at the max torque. what help will downshifting give?

 

Yes you need to downshift. Unlike horsepower, torque is affected by gearing. I.e. lower gear = higher torque at the wheels at a given engine rpm. Do note that spec sheets list power and torque figures at the engine, so a 120bhp, 120nm car may still accelerate slower than a 120bhp, 100nm car with sufficiently shorter gear ratios.

[Jkl78]

BTW....curious...what car max its torque at 3k ?? (I only know of Rolls Royce :p)

 

At least i know my getz got the max torque ard 3k.

[Auron]

it seems a lot of ppl do not know the difference between power and torque...

 

taking an example of the corolla altis.

 

Max. Output (kW/rpm) 80 / 6000

Max. Torque (Nm/rpm) 145 / 4400

 

in layman terms,

 

when the engine is at 4.4k rpm, what does it means?

when the engine is at 6k rpm, what does it means?

 

if you are driving at 4.4k rpm currently and you want to overtake the car infront, do you drop a gear so that the rpm shoot up to 6k to give you max output?

 

 

 

[Liuz0004]

to add on, will the acceleration improve after downshifting 1 gear? since torque is already maxed out.