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Old 24th December 2015, 20:14   #61
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Default Re: Your car's engine rpm at highway cruising speeds

Ertiga Diesel (2012)

80kmph @ 1950 rpm
100 kmph @ 2450 rpm
120 kmph @ 2900-3000 rpm

Feels so noisy after 120 kmph that I don't feel comfortable pushing for cruising


Quote:
Originally Posted by Numb_Locked View Post
As per the official T-Bhp review of XUV5OO, 120 kmph should come up at 2200 rpm. Would love to know what factors can cause variables.
Quote:
Originally Posted by manson View Post
Number of occupants, higher luggage load, higher fuel level, etc. could be a reason for lower road speed at the same RPM / higher RPM for same road speed.
The official review of ertiga says 120 kmph is at 2600 rpm, where as I see it in my car with an additional 400 rpm even with just one driver. I can think of the following reasons for variations in rpm, but none are applicable in my car

1. Non oem size tires
2. Slipping clutch
3. Tacho calibration

But I don't 'understand why the load on car makes a difference in rpm for a given gear and speed? Since the gear ratios are fixed, we should be able to calculate the rpm at which the engine should be if speed is known right? Then how load becomes a parameter?
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Old 24th December 2015, 20:30   #62
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Default Re: Your car's engine rpm at highway cruising speeds

Here the readings for my Swift ZDi:

80 kmph - 1900 RPM
100 kmph - 2300 RPM
120 kmph - 2800 RPM

It is quiet irritating and noisy after 120 kmph where the car feels like it is being strangled to death! There is enough after 120 kmph but it just doesn't like to be pushed above that!
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Old 24th December 2015, 20:35   #63
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Default Re: Your car's engine rpm at highway cruising speeds

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Originally Posted by extreme_torque View Post
I find this hilarious. The rpm is not dependent on the load. No matter what the load, a kph in a particular gear will always be at the same rpm. The gear ratio is not going to change because of the load.

My Mazda 3 does 100 kph at just below 2000 rpm in 6th gear. It is a naturally aspirated 2.5 petrol.
I agree, i see at lot of people talking here of readings changing with change in load
No of passengers/load in boot has absolutely no affect on RPM per Speed ratio.
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Old 24th December 2015, 20:40   #64
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Default Re: Your car's engine rpm at highway cruising speeds

Dzire VDi: 2013

80 kmph - 1900 RPM
100 kmph - 2200 RPM
>100 Kmph - I don't know. I rarely go beyond 100 since I get the best mileage and also the smoothest ride at the above speeds.
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Old 24th December 2015, 21:24   #65
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My Honda City iDTEC 2014

80kmph around 1800 revs
100 kmph around 2000 revs
120 kmph around 2200 revs

The machine is too smooth , until 3000 RPM above that seems a lil unfair for her
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Old 25th December 2015, 18:11   #66
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Default Re: Your car's engine rpm at highway cruising speeds

Quote:
Originally Posted by dhawcash View Post
Suzuki esteem
100 kmph@ 2100rpm

Volvo b7r
90-100 kmph @ 1100-1200 rpm
( peeped at the dash once. Out of habit. Was difficult peeping at it from the seat just behind the driver's though.)

Just for comparison's sake,
Hero Honda Karizma
100kmph @ 6000ish rpm

Do note smaller engines need to rev more for same speeds. Lets discuss why!
You need to recheck this figure
2100RPM is too low for an esteem to achieve 100.
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Old 25th December 2015, 18:23   #67
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Default Re: Your car's engine rpm at highway cruising speeds

(1) Vehicle load (2) tyre pressure and (3) tyre-wear.
All these parameters change the effective circumference of the tyre. Hence the variations in these relative speeds.
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Old 25th December 2015, 19:20   #68
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I notice that in most of the figures noted here that for a given change in vehicular speed( say 20kmhr as mostly mentioned here), the change in rpm is not constant( the change in rpm from 80kmph to 100kmph is 400rpm but from 100kmph to 120 kmph it's 500rpm)( Example taken from a4anurag's Swift ZDi). Can anyone explain why.
Sorry for the noob question.

Last edited by Turbohead : 25th December 2015 at 19:21.
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Old 25th December 2015, 20:03   #69
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Default Re: Your car's engine rpm at highway cruising speeds

Quote:
Originally Posted by bhardwhu View Post
For my 2013 Honda Civic manual in US, I am getting @100kmph - 2500 RPM in 5th gear. Is it normal?

Himanshu
My 2009 Civic 1.8 V MT has a similar reading. At 100 kmph in 5th, I get about 2600 rpm.
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Old 25th December 2015, 21:48   #70
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Quote:
Originally Posted by Turbohead View Post
I notice that in most of the figures noted here that for a given change in vehicular speed( say 20kmhr as mostly mentioned here), the change in rpm is not constant( the change in rpm from 80kmph to 100kmph is 400rpm but from 100kmph to 120 kmph it's 500rpm)( Example taken from a4anurag's Swift ZDi). Can anyone explain why.
Sorry for the noob question.

I too was pondering upon the same for a while. I think it's something to do with gear ratios..
But in the case of optra,it's 200 RPM for every 10 kmph.
If we take the case of igen i20 ,100 kmph came up late and afterwards the increasing speeds were clustered around 2200-2400 RPM.
Not to offend anyone ,but the cars which has the highest engine speeds at 100 and 120 kmph among the cars mentioned till now are the ones which are usually driven fastest atleast here in South Indian highways. I couldn't fathom how the passengers would be sitting inside - maybe like in a rice mill.
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Old 25th December 2015, 23:14   #71
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Default Re: Your car's engine rpm at highway cruising speeds

My 1st gen Honda City VTEC used to do approximately 2600rpm @ 100kmph.

I say "used to" because it has now been modified by Joel
After changing the final drive it does around 3300rpm @ 100kmph.

I've rarely crossed 100 before and after the mods so I don't have any other stats.
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Old 26th December 2015, 00:56   #72
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Default Re: Your car's engine rpm at highway cruising speeds

My SX4 Zxi VVT:

80 kmph at 2000 rpm in 5th gear
100 kmph at 2500 rpm in 5th gear

I upshift at 2000 rpm in city and on highways. If I am overtaking, I upshift at 2500 (max 3000 rpm).
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Old 26th December 2015, 09:54   #73
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Default Re: Your car's engine rpm at highway cruising speeds

I do not think, I have observed any change in rpm reading in any car I have driven whether it is loaded or not. Small cars do struggle to gain speed if there is a full load of passengers & luggage.

Changing tire and not sticking to OE size does have a change in odo reading [slight]. Unsure if rpm readings vary here.

115 @ 7,000 revs. CBR 250R
120 @ 2,000 revs. Yeti 4X4
85 @ 2,000 revs 4WD S10
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Old 26th December 2015, 20:50   #74
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Default Re: Your car's engine rpm at highway cruising speeds

Here are readings for my Manza Quadrajet with Fiat's 1.3L MJD
4th gear: 2000rpm-60kmph, 2500rpm-80kmph. This is where I shift to fifth gear.
5th gear: 2000rpm-80kmph, 2500rpm-100kmph, 3000rpm-120kmph, So for every 500rpm increase, speed goes up by 20kmph.
In fact, rpm moves linearly with speed in all five gears obviously with incremental values. All these readings are from visual observations.
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Old 26th December 2015, 21:37   #75
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Default Re: Your car's engine rpm at highway cruising speeds

I drive a 2.0 Lancer GT with a CVT automatic tranny here in Dubai.

I set the cruise control at 140 kmph because that is the speed limit here and it cruises at a steady 2700 rpm.
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