Rpm at 120 km

cena

What rpm should a 1.4 petrol car do at 120 motorway speed.

I'm getting around 4000 rpm

rex-x

cena wrote: »

What rpm should a 1.4 petrol car do at 120 motorway speed.

I'm getting around 4000 rpm

That is entirely dependant on the car, every one will be different depending on the final drive

Henry Ford III

Depends on the gearing

cena

rex-x wrote: »

That is entirely dependant on the car, every one will be different depending on the final drive

It's an opel

Toyotafanboi

cena wrote: »

It's an opel

Ah, 3150 so.

Every engine and gearbox combination in every make and model is different.

We really need a make, model, engine and year to even give a half good guess.

rex-x

If it is an astra g then they do about 120 at 4k, other models may be similar.... you aren't really being generous with the information though

Leonard Hofstadter

That would be about right, 1.4s aren't exactly what you'd call powerful so the engine needs to be working quite hard to maintain momentum at those speeds. I had a 1.4 Corolla many moons ago and it span at 3800 on the motorway.

cena

Toyotafanboi wrote: »

Ah, 3150 so.

Every engine and gearbox combination in every make and model is different.

We really need a make, model, engine and year to even give a half good guess.

1.4 Astra 07. 5 gears

Andrewf20

Our 07 1.4 petrol auris did around 3750rpm. 5 speed.

DaveyDave

I've actually been thinking about this recently. The 7 speed in my Golf is odd as it's 3,000rpm at 120kph. I find this quite high as the gearbox usually upshifts at 2,000rpm. Considering it would be even higher at 130kph which is what European motorways are, you'd think there'd be an extra gear or a different ratio.

1st gear is quite short and I swear it's in 2nd gear as soon are you take off at a light, I feel like 1st probably could have been a bit longer.

It would be better if it was sitting at 1,500rpm at 100kph rather than 70kph.

cena

Andrewf20 wrote: »

Our 07 1.4 petrol auris did around 3750rpm. 5 speed.

I don't remember the car going this high

rex-x

cena wrote: »

I don't remember the car going this high

Nothing (other than a new gearbox/diff FD) can meaningfully change the rpm the car drives at except a slipping clutch which would be noticeable in more ways

rex-x

DaveyDave wrote: »

I've actually been thinking about this recently. The 7 speed in my Golf is odd as it's 3,000rpm at 120kph. I find this quite high as the gearbox usually upshifts at 2,000rpm. Considering it would be even higher at 130kph which is what European motorways are, you'd think there'd be an extra gear or a different ratio.

1st gear is quite short and I swear it's in 2nd gear as soon are you take off at a light, I feel like 1st probably could have been a bit longer.

It would be better if it was sitting at 1,500rpm at 100kph rather than 70kph.

What engine is in it?

Leonard Hofstadter

DaveyDave wrote: »

I've actually been thinking about this recently. The 7 speed in my Golf is odd as it's 3,000rpm at 120kph. I find this quite high as the gearbox usually upshifts at 2,000rpm. Considering it would be even higher at 130kph which is what European motorways are, you'd think there'd be an extra gear or a different ratio.

1st gear is quite short and I swear it's in 2nd gear as soon are you take off at a light, I feel like 1st probably could have been a bit longer.

It would be better if it was sitting at 1,500rpm at 100kph rather than 70kph.

That's low enough for a petrol, my 2.5 petrol spins at 3300 rpm doing 120 (it does only have five speeds, though). Petrols deliver their power higher up the rev range, if it span any lower it would be gutless. As an aside, I find modern diesels to be hopelessly overgeared, I drove my Dad's 2.0 diesel Avensis a couple of weeks ago and it has no power whatsoever in sixth gear below 100 km/h. Even low powered petrols will pull away from as little as 50 km/h in top gear (not quickly admittedly, but they don't have that feeling of no power at all like a diesel does when the turbo is off boost).

dastardly00

My '06 Focus 1.4 is pretty close to 4,000 RPM at 120 kph

cena

dastardly00 wrote: »

My '06 Focus 1.4 is pretty close to 4,000 RPM at 120 kph

When I say 4000 rpm . It can 4500 rpm

rex-x

cena wrote: »

When I say 4000 rpm . It can 4500 rpm

It is a fixed value, it never changes unless you have clutch slip

CiniO

cena wrote: »

What rpm should a 1.4 petrol car do at 120 motorway speed.

I'm getting around 4000 rpm

That's OK.

I have 2 honda CRV's.
Both the same model 2.0 petrol II gen, facelift model.

One is automatic, one is manual.
If I remember correctly, manual is doing around 4000rpm at 140km/h, while automatic is doing only 3500rpm at 140km/h (if I remember correctly - can double check tomorrow).

demanufactured

cena wrote: »

What rpm should a 1.4 petrol car do at 120 motorway speed.

I'm getting around 4000 rpm

Depends on the gear ratio in that particular car.

PaulKK

This is interesting, I previously thought my 2.0 diesel was pretty good at about 1900rpm at 120km/hr, but I was driving a Chevy Impala a couple of weeks ago (3.6 v6) and it was doing about 1500rpm at 75mph. Never saw a petrol car with such low rpm at those speeds.

In fairness, the gearbox left a lot to be desired.

Skylinehead

rex-x wrote: »

It is a fixed value, it never changes unless you have clutch slip

I imagine other factors like a roof box or under-inflated tyres would increase RPM at a specific speed too, or towing a trailer of course.

bigroad

Nixonbot wrote: »

I imagine other factors like a roof box or under-inflated tyres would increase RPM at a specific speed too, or towing a trailer of course.

No speed and revs a totally directed.
Unless you are in an auto where it may change to a lower ratio which will bring your revs up.

V8 Interceptor

Leonard Hofstadter wrote: »

I find modern diesels to be hopelessly overgeared, I drove my Dad's 2.0 diesel Avensis a couple of weeks ago and it has no power whatsoever in sixth gear below 100 km/h.

Isn't that the point of a 6th gear? Its only for Motorway speeds.

CiniO

PaulKK wrote: »

This is interesting, I previously thought my 2.0 diesel was pretty good at about 1900rpm at 120km/hr, but I was driving a Chevy Impala a couple of weeks ago (3.6 v6) and it was doing about 1500rpm at 75mph. Never saw a petrol car with such low rpm at those speeds.

In fairness, the gearbox left a lot to be desired.

I wonder why people think the lower revs the better.

No offence to you or anyone, but that's exactly my understanding of your post when you say that you thought your diesel was pretty good at 1900 but some other car had it at 1500.

Why would lower revs at certain speed make it better ?

V8 Interceptor

CiniO wrote: »

That's OK. I have 2 honda CRV's. Both the same model 2.0 petrol II gen, facelift model. One is automatic, one is manual.
If I remember correctly, manual is doing around 4000rpm at 140km/h, while automatic is doing only 3500rpm at 140km/h (if I remember correctly - can double check tomorrow).

What was it doing when you were dragging two tonnes across Europe? :P

brianwalshcork

CiniO wrote: »

I wonder why people think the lower revs the better.

No offence to you or anyone, but that's exactly my understanding of your post when you say that you thought your diesel was pretty good at 1900 but some other car had it at 1500.

Why would lower revs at certain speed make it better ?

Lower fuel consumption, all other things being equal

V8 Interceptor

CiniO wrote: »

I wonder why people think the lower revs the better. No offence to you or anyone, but that's exactly my understanding of your post when you say that you thought your diesel was pretty good at 1900 but some other car had it at 1500. Why would lower revs at certain speed make it better ?

Fuel economy.


(Irish cars, not phukking Impalas)

Teddy Daniels

Nixonbot wrote: »

I imagine other factors like a roof box or under-inflated tyres would increase RPM at a specific speed too, or towing a trailer of course.

It’s a fixed mechanical relationship.

Arthur Daley

CiniO wrote: »

I wonder why people think the lower revs the better.

Presumably a bit less wear over the life of the engine, and so higher mileage might be achieved.

CiniO

V8 Interceptor wrote: »

What was it doing when you were dragging two tonnes across Europe? :P

6000rpm on 2nd gear going up steep hills. Great fun it was

CiniO

brianwalshcork wrote: »

Lower fuel consumption, all other things being equal

There is no direct relation between revs your drive at and fuel consumption.
At least not as direct as people think.

CiniO

Arthur Daley wrote: »

Presumably a bit less wear over the life of the engine, and so higher mileage might be achieved.

Driving at too low revs usually would actually lower engine life. Hi revs are not bad for engine and shouldn't shorten its life.

PaulKK

CiniO wrote: »

I wonder why people think the lower revs the better.

No offence to you or anyone, but that's exactly my understanding of your post when you say that you thought your diesel was pretty good at 1900 but some other car had it at 1500.

Why would lower revs at certain speed make it better ?

Lower fuel consumption?

The lower the RPM at speed the more efficient it is. It's also quieter.

Arthur Daley wrote: »

Presumably a bit less wear over the life of the engine, and so higher mileage might be achieved.

And this.




I'm not talking about driving at such low RPM that the engine is labouring.

PaulKK

V8 Interceptor wrote: »

Fuel economy.

(Irish cars, not phukking Impalas)

It was actually pretty reasonable on the juice for a 300bhp car.

Del2005

Teddy Daniels wrote: »

It’s a fixed mechanical relationship.

No its not. A fully loaded car with a roof box will need more power to reach motorway speed than an empty one with no roof box. So it'll have to rev highrr to reach a given speed, air resistance is the biggest issue when travelling fast. Similarly if you have an empty car it'll use less fuel than a full car so the engine will be revving higher if fully loaded.

The first time i drove my Dad's 1.6 Focus I kept thinking that I was in 3rd. gear on the motorway. My GS450h has no tacho but someone drove one with an OBD reader connected and it was only 1200 rpm at motorway speed

ltdslipdiff

If its low rpm at motorway speeds you want, there is one car that stands out - Lexus Is220d. I think you need to be doing 130 to even think about going for 6th and even then it's labouring heavily below 2000rpm! Longest 6th gear ever!!!

hi_im_fil

Del2005 wrote: »

No its not. A fully loaded car with a roof box will need more power to reach motorway speed than an empty one with no roof box. So it'll have to rev highrr to reach a given speed, air resistance is the biggest issue when travelling fast. Similarly if you have an empty car it'll use less fuel than a full car so the engine will be revving higher if fully loaded.

The first time i drove my Dad's 1.6 Focus I kept thinking that I was in 3rd. gear on the motorway. My GS450h has no tacho but someone drove one with an OBD reader connected and it was only 1200 rpm at motorway speed

It’s still a direct relationship between engine speed and wheel sleed though. A full load or empty load has no bearing on the engine rpm in a particular gear for a particular speed.

Pkiernan

PaulKK wrote: »

This is interesting, I previously thought my 2.0 diesel was pretty good at about 1900rpm at 120km/hr, but I was driving a Chevy Impala a couple of weeks ago (3.6 v6) and it was doing about 1500rpm at 75mph. Never saw a petrol car with such low rpm at those speeds.

In fairness, the gearbox left a lot to be desired.

Comiserations on getting stuck with the Impala.

The modern one is such an insult to the heritage of the car.

PaulKK

Pkiernan wrote: »

Comiserations on getting stuck with the Impala.

The modern one is such an insult to the heritage of the car.

Yes, no chargers this time but it was the best of a bad bunch. When your other options are Tuscons etc it becomes an attractive option.

Henry Ford III

Del2005 wrote:

No its not. A fully loaded car with a roof box will need more power to reach motorway speed than an empty one with no roof box. So it'll have to rev highrr to reach a given speed, air resistance is the biggest issue when travelling fast. Similarly if you have an empty car it'll use less fuel than a full car so the engine will be revving higher if fully loaded.

Not at all.

route66

Del2005 wrote: »

No its not. A fully loaded car with a roof box will need more power to reach motorway speed than an empty one with no roof box. So it'll have to rev highrr to reach a given speed, air resistance is the biggest issue when travelling fast. Similarly if you have an empty car it'll use less fuel than a full car so the engine will be revving higher if fully loaded.

The first time i drove my Dad's 1.6 Focus I kept thinking that I was in 3rd. gear on the motorway. My GS450h has no tacho but someone drove one with an OBD reader connected and it was only 1200 rpm at motorway speed

Eh, yes it is. I think it's clear to most, we are discussing manual 'boxs here.

I think you need to Google the differences between manual gearboxes - where the revs are fixed In a given gear - and an auto where the revs vary as the gearbox decides which gear is best. On your Lexus, the planetary gears allow a much greater range of gearing - continuously variable - than most other cars out there.

Btw, on my IS300H, I can get the revs to display with a setup change.

Henry Ford III

CVT is totally different obviously. We are discussing a manual gearbox here.

V8 Interceptor

CiniO wrote: »

6000rpm on 2nd gear going up steep hills. Great fun it was

You must've near killed that poor car. I told you to hire out a TDI for the job!

V8 Interceptor

PaulKK wrote: »

It was actually pretty reasonable on the juice for a 300bhp car.

You say the gearbox wasn't great but I'd say the pull on it was impressive?

(I love Yank Tanks )

V8 Interceptor

Del2005 wrote: »

No its not. A fully loaded car with a roof box will need more power to reach motorway speed than an empty one with no roof box. So it'll have to rev highrr to reach a given speed, air resistance is the biggest issue when travelling fast. Similarly if you have an empty car it'll use less fuel than a full car so the engine will be revving higher if fully loaded.

Some humble pie being prepped for Del Boy as we speak :pac:

masterboy123

I think my Benz C class is at 2.8x1000 @120 kmph

2 Lit engine and 7 gear automatic transmission.

P. S. Edit. Its 1.9x1000 at 120 kmph

PaulKK

V8 Interceptor wrote: »

You say the gearbox wasn't great but I'd say the pull on it was impressive?

(I love Yank Tanks )

Once the gearbox realised what was happening it pulled along nicely

I always try and get something with a bit of poke when hiring over there.

Tacitus Kilgore

Del2005 wrote: »

No its not. A fully loaded car with a roof box will need more power to reach motorway speed than an empty one with no roof box. So it'll have to rev highrr to reach a given speed, air resistance is the biggest issue when travelling fast. Similarly if you have an empty car it'll use less fuel than a full car so the engine will be revving higher if fully loaded.

The first time i drove my Dad's 1.6 Focus I kept thinking that I was in 3rd. gear on the motorway. My GS450h has no tacho but someone drove one with an OBD reader connected and it was only 1200 rpm at motorway speed

Thats cos your gs450h has a cvt box. Read up on it, it doesn't work like a manual box.

Manual box or in 'overdrive' on a old school auto will always deliver the same rpm/speed in a given gear no matter what as it is a completely mechanical relationship with no possibility of variance. (Unless if course theres some serious clutch slippage, and of course if it's slipping a lot at 120km/h, you won't be lasting long)

Del2005

hi_im_fil wrote: »

It’s still a direct relationship between engine speed and wheel sleed though. A full load or empty load has no bearing on the engine rpm in a particular gear for a particular speed.

If you do a journey of 100km at 100km/h in an empty vehicle you'll use less fuel than doing the same journey in a fully loaded vehicle. The only way to use more fuel is to go bang more often, so if the journey is the same but you use more fuel in one you have to rev higher.

Henry Ford III

Del2005 wrote:

If you do a journey of 100km at 100km/h in an empty vehicle you'll use less fuel than doing the same journey in a fully loaded vehicle. The only way to use more fuel is to go bang more often, so if the journey is the same but you use more fuel in one you have to rev higher.

Again no. The revs will be the same at any given speed. You'll need to press the accelerator down a bit more if the car is heavy - that's where the mpg suffers.

Twenty Grand

Del2005 wrote: »

If you do a journey of 100km at 100km/h in an empty vehicle you'll use less fuel than doing the same journey in a fully loaded vehicle. The only way to use more fuel is to go bang more often, so if the journey is the same but you use more fuel in one you have to rev higher.

Wrong again.