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C5 eco mode

Posted: Mon Oct 07, 2019 10:38 am
by Greyfornow
Anyone know what the eco mode button actually does? Should there be something in the dash to show it is on? I'm finding I have to press the button a few times to get the light to switch on, and not noticing any difference at all...!

1.2 manual Flair C5

Re: C5 eco mode

Posted: Mon Oct 07, 2019 10:45 am
by routemaster1
Which button are you referring to?

Re: C5 eco mode

Posted: Mon Oct 07, 2019 1:09 pm
by mikeb
See page 129 here;

http://service.citroen.com/ACddb/modele ... _en-GB.pdf

i have found you need to press and hold the button before the function is activated.

It appears to limit the rate of acceleration and reduce the speed of the heating/aircon fan.

Re: C5 eco mode

Posted: Mon Oct 07, 2019 1:22 pm
by routemaster1
So just to clarify, we are discussing the eco mode on an auto gearbox, not economy mode (designed to prevent flattening the battery) or the flashing green eco icon, which is part of the stop/start system.

Re: C5 eco mode

Posted: Tue Oct 08, 2019 2:29 am
by srperry
My car is a manual gearbox and has the 'eco' button - which you do have to long press to turn on. I haven't noticed any difference in limiting acceleration or the aircon fan when used. But I do thing that the suggested gear indicator suggests changing up quicker than without the eco button turned on. That equates to short-shifting, which racing drivers do to conserve fuel. I'll see if I can check the revs when the indicator lights up both when the eco mode is on and when it's not.

I can't do that for a week or so though because I'm away working in the USA and missing my C5 a lot! :)

Re: C5 eco mode

Posted: Tue Oct 08, 2019 9:50 am
by rdeknegt
Have the automatic gearbox , and if I switch to ECO mode (no indicator in Display, contrary to Sport mode) the CC blower switches to a lower Speed and I presume to less Energy use. Also the trottle Response is bad. Therefore I only use the ECO mode on the motorway with activated Cruse control
but have to say I still have to notice a lower Petrol use.

Re: C5 eco mode

Posted: Tue Oct 08, 2019 6:07 pm
by LenH
Hi,
I've a diesel Auto and what I've found, apart from more sluggish throttle response and changing up sooner, is it will free wheel more.
Its more noticeable on A roads rather than motorways. You can see the difference if you watch rev counter when you lift off throttle, the revs will drop to tick-over in Eco mode where in normal the engine keeps revs up a bit higher.
You almost coast sometimes as it feels like you loose engine breaking.
I think somewhere I read in manual it also saves wear on gearbox.
However I've yet to notice any difference in fuel consumption.

Len

Re: C5 eco mode

Posted: Thu Oct 10, 2019 1:49 pm
by routemaster1
I have had a Peugeot 3008 diesel manual as a loan car today. After seeing this thread, I tried the sport mode, and what I found was that it certainly sharpens the throttle response. If you accelerate in, say, third gear with sport off, and switch sport on without changing the throttle opening, the acceleration is markedly better. Allied to this is the recalibration of the gear change indicator which suggests changing up at higher revs.

I really don't understand the comment above about the revs dropping on slowing. The revs drop in line with the road speed in any gear, so cannot change with sport mode on.

Re: C5 eco mode

Posted: Thu Oct 10, 2019 9:20 pm
by LenH
Routemaster1,
Its an auto I was referring to in my reply when driving in Eco mode, in a manual agreed the revs would drop in line with road speed.
In sports mode in auto, as manual, the gears are held onto longer and throttle response is sharper.

Re: C5 eco mode

Posted: Fri Oct 11, 2019 7:55 am
by routemaster1
LenH wrote:
Thu Oct 10, 2019 9:20 pm
Routemaster1,
Its an auto I was referring to in my reply when driving in Eco mode, in a manual agreed the revs would drop in line with road speed.
In sports mode in auto, as manual, the gears are held onto longer and throttle response is sharper.
Sorry about that. I didn't realise!