Hi guys,

I have a fabia 1.2 105bhp , and wondering what is the best rpm to change gears to get the most economy !?

Thanks

I heard 2500 for petrol and 2000 for diesel, I tried this for a week and really never seen a difference

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Try not to think too rigidly about exactly what rpm to change at.

 

Doing this will likely use more fuel, labour the engine and cause excess wear.

 

On a light throttle, flat road and no other factors then 2000rpm should be about right. This is where a DSG gearbox would change.

 

You may find you are having to work the gearbox a bit more doing this though. I always found something more like works best 1st > 2nd pretty much straight away, give a bit of gas and get up to a speed appropriate for 4th then block change up to 4th.

 

Most modern cars have the gearing and revs to set off in 1st then straight to 3rd or 4th.

 

The key to saving fuel isn't always not revving the engine. Sometimes giving it some gas and gettting up to speed quickly saves more fuel in the long run.

 

Try and keep your foot off the gas or use light pressure as much as possible.

 

Phil

Edited 17 December, 201411 yr by Phil-E

I heard 2500 for petrol and 2000 for diesel, I tried this for a week and really never seen a difference

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Its not as simple as that tbf.

The CR diesels for example are most economical when the turbo is spooling abit more. So people find themselves revving it a little more, to 3k perhaps.

The pd engines didnt require such revs.

Not sure about the 1.2 tsi myself.

I just change gear when its safe to do so without labouring the engine in my htp. That can be around 3500 if im going up a hill and accelerating

I have a petrol, and when I shift at 2000 I find the car bogs down a bit. So is it more economical to let it bog down or rev it a little higher and stop it bogging down?

Its not as simple as that tbf.

The CR diesels for example are most economical when the turbo is spooling abit more. So people find themselves revving it a little more, to 3k perhaps.

The pd engines didnt require such revs.

Not sure about the 1.2 tsi myself.

I just change gear when its safe to do so without labouring the engine in my htp. That can be around 3500 if im going up a hill and accelerating

I agree in my htp i always change at around 3000 as anything lower just seems like your changing to early and gaining no power

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I think it depends on the gradient/slope of the road but my display normally tells me to change gear around 2200rpm on a flat surface. Sometimes i go to around 3000rpm and change from 2nd to 4th and vice versa, i think that helps with fuel economy a little bit but as others have said you should apply light pressure to the throttle as this will hopefully lead to better mpg

I have a petrol, and when I shift at 2000 I find the car bogs down a bit. So is it more economical to let it bog down or rev it a little higher and stop it bogging down?

Letting it bog down too much (or labouring) does an engine more damage than thrashing it, also it uses more fuel like thst.

Best off keeping the engine happy, letting it rev freely.

You dont need to floor it to rev it abit more. Just build the revs steadily

I agree in my htp i always change at around 3000 as anything lower just seems like your changing to early and gaining no power

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Yeah, i usually change between 2500 and 3000.

Max torque is at 3000. If going up a big hill, i find it best to rev abit higher so when i change. Its at about 3000

The important thing is to get to the lowest RPM without labouring the engine when cruising as quickly as possible. Lower rpm requires wider throttle, which in turn mean more compression and that make better efficiency, basically. There are some other considerations, like whether the ECU is running lean (this is worth a read) or rich (in acceleration), but basically the engine is more efficient under load at turning chemical energy in the fuel into mechanical energy. Obviously if that is being used to wear out the tyres then fuel consumption will still be worse!

Edited 17 December, 201411 yr by pearce_jj