r999

what a fail.

The statement in red is your statement from your earlier post.

So you explain it.

Of course it isn't my statement. Can't you read? Look at what I wrote and what you then added to it. You quoted me in red, then you carelessly put your comment in red too, and now you can't even see what you've done.

And you call me confused?

Got my plaster off Thursday and have now had a chance to play in the Yeti. It's done 1850 miles since December and I think 600 of that was SWMBO going backwards and forwards to Manchester to see her Mum even though she's got her own car that, "she'd never part with!"

Anyway, I played with the cruise control and didn't realise that you don't have to keep clicking the stalk rocker button to change (cruise control) speed, you can hold it in and it changes the setting a lot quicker. I found it great flicking between 40, 60 and 70 as the speed limits changed today - I know it's sad but I mention it in case any one else wasn't aware you could do this.

r999 I think you should read through your posts from the start.

I can read,

I didn't call you confused, I asked if you were confused, which is clearly different.

I am confused by your post because you contradict yourself in it.

I will leave it at that, go and enjoy my holiday, forget about cruise control, and not revisit this thread.

A wide open throttle (perhaps before injection systems) is bad for economy or it isn't, changing down, may be worse or it isn't.'

I should clarify, I added, ''perhaps before injection systems'' to your statement because ''throttle'' is not the

correct term.

Edited 2 June, 201214 yr by servicepoint

I will leave it at that, go and enjoy my holiday, forget about cruise control, and not revisit this thread.

Good idea, because you're getting yourself in deeper: --

I should clarify, I added, ''perhaps before injection systems'' to your statement because ''throttle'' is not the

correct term.

Wrong again. See http://en.wikipedia....hrottle_control , plus about 3,300,000 further references on the web to the same term.

Edited 3 June, 201214 yr by r999

Good idea, because you're getting yourself in deeper: --

Wrong again. See http://en.wikipedia....hrottle_control , plus about 3,300,000 further references on the web to the same term.

Please if your going to try a be smart and condoscending with your answers get your facts right for a start and spare me the 3,300,000 further references, I don't have a throttle control as in the link you posted in my 170 cr engine!

You are misusing the term 'Throttle', commonly done by many.

As your using Wikipedia,

Throttles are not used in diesel engines, but the term throttle is often used to refer to any input that modulates the power output of a vehicle's prime mover. Throttle response is often confused with better power, but throttle response is rather related to time taken for change in power level.^[1]

http://en.wikipedia....rottle_response

I will also quote Totally Square,

''2. Of course diesel engines don't have "throttles" technically speaking, yet if I recall the theory on "throttle wide open being most efficient" related to carburetor-fed engines... not sure it applies to computerised fuel injection systems at all?''

Going back,

''Yes, but that recommendation was about accelerating away from rest and up to cruising speed. Whereas people here are talking about the increase in speed triggered by the 'resume' button of a cruise control - a different thing entirely, which remains in one gear and opens the throttle neither a little nor all the way.''

Can you explain from your quote where the ''accelerating away from rest and up to cruising speed.'' comes from, the BMW book never alluded to this and neither did I.

Further, from your #13,

''having the deeply-ingrained and over-simple idea that a wide-open throttle is bad for economy. Well, it is - but not in all circumstances; and the alternatives, such as changing down, may be worse.''

Explain? You made the above statement, I never agreed or disagreed with the point because I don't have test information, I only added ''perhaps before injection systems'' because like I said our cars do not have a throttle in the correct sense now.

So please explain, or as you put it, ''Go on, then, tell us: which is it?''

Edited 3 June, 201214 yr by servicepoint

Interesting discussion - possibly too many variables in the real world to be definitive.

Gutted - I was hoping the last three posts would be about the actual cruise control rocker button on the stalk and if I'm missing any other tricks :think:

Gutted - I was hoping the last three posts would be about the actual cruise control rocker button on the stalk and if I'm missing any other tricks :think:

No such luck.. too many want to dissect others posts to get anything worthwhile.

Anyway, I'm out of this, 3 weeks holiday should do.

r999 can come on and rant away till his hearts content

and perhaps in future there will be a more helpful and correct cruise control thread.

Edited 3 June, 201214 yr by servicepoint

I'll help Sandy!!

The rocker switch acts to turn it on, at your current speed.

Then, if you press the top momentarily that speed increases by 1km per hour for each dab at it. The opposite happens if you dab the lower direction of the rocker.

If you hold the rocker up or down constantly for a few seconds, you will gain, or lose speed, which will then be the new cruise speed when you take the pressure off.

If you have to touch brakes, gear, or clutch, the CC turns off. BUT. When you dab the switch again, it resumes where it left off, at the same speed.

If you move the switch on top of the arm, it turns CC off, and clears the memory.

I hope your guts are now restored, and that this little essay has helped, in amongst all the totally unnecessary angst and upset - which I really hope will cease by ALL involved parties, because it just does not help - and it really isn't that important either.

G

I'll help Sandy!!

Then, if you press the top momentarily that speed increases by 1km per hour for each dab at it. The opposite happens if you dab the lower direction of the rocker.

Knew it increased decreased the speed but didn't realise it was by 1km - be better if it was 1mph :wonder:

If you hold the rocker up or down constantly for a few seconds, you will gain, or lose speed, which will then be the new cruise speed when you take the pressure off.

Yep, got his one when playing with it

If you move the switch on top of the arm, it turns CC off, and clears the memory.

Ah, didn't realise this, I was using it to slow the car down initially because it doesn't have as dramatic a 'slowing effect' as touching the brake

.........in amongst all the totally unnecessary angst and upset - which I really hope will cease by ALL involved parties, because it just does not help - and it really isn't that important either.

+1 Might have been better to debate it by PM :yes:

G

Cheers George

I'll help Sandy!!

The rocker switch acts to turn it on, at your current speed.

Then, if you press the top momentarily that speed increases by 1km per hour for each dab at it. The opposite happens if you dab the lower direction of the rocker.

If you hold the rocker up or down constantly for a few seconds, you will gain, or lose speed, which will then be the new cruise speed when you take the pressure off.

If you have to touch brakes, gear, or clutch, the CC turns off. BUT. When you dab the switch again, it resumes where it left off, at the same speed.

If you move the switch on top of the arm, it turns CC off, and clears the memory.

I hope your guts are now restored, and that this little essay has helped, in amongst all the totally unnecessary angst and upset - which I really hope will cease by ALL involved parties, because it just does not help - and it really isn't that important either.

G

I had no idea moving the rocker switch increases and decreases the speed, thanks for that, and thanks for bringing it up sandy, glad ur recovering at last, enjoy those nice roads up in your part of the world!

Just be a little bit careful if you're as hamfisted as me. I've posted (not on this thread) about an experience some time back. The switch on top of the stalk 'arms' the CC, the switch at the end of the stalk actually sets it. Some while back, hacking along a twisty road at some rate of knots, with the arming switch on, in very quick sequence I eased off the accelerator a little, and turned the wheel to the right. I continued to progress into the bend with speed undiminished - because I'd accidentally hit the setting switch with my knuckles. A true squeaky bum moment!

Once you turn it on, or the first time you use it after starting the engine, as mine is on all the time either rocker will set the current speed.

Dabbing the switch seems to change the speed by 2km/hr usually, at least it always seems impossible to get the km above or below the current speed.

If you flick the off switch slightly the cruise control dissengages;, if you wish to coast, which is better than dabbing the brakes and causing issues behind. It doesn't lose the set speed, unless you click it off all the way. ie nudge the switch to coast for a bit, then touch the top rocker to resume the previous speed. If you touch the lower rocker you set the current speed.into the unit.

If you flick the off switch slightly the cruise control dissengages;, if you wish to coast, which is better than dabbing the brakes and causing issues behind. It doesn't lose the set speed, unless you click it off all the way. ie nudge the switch to coast for a bit, then touch the top rocker to resume the previous speed. If you touch the lower rocker you set the current speed.into the unit.

I'll play with that next time I'm out!

Yup. As KenF said

Dipping the clutch even slightly deactivates CC.

I use this method unless I have to brake at the same time.

Another trick I learned is going from, say, a 40 limit to a 50 or 60 limit I am normally travelling in top gear with CC engaged so just hold the top of the rocker until the desired speed is achieved.

You don't accelerate rapidly but at a reasonable rate.I'm guessing it is a balance between best economy and progress ?

Likewise, with going from a higher speed limit to a lower one, I just hold in the bottom of the rocker in good time so i'm doing the correct speed when I arrive at the lower limit signs.

I love the CC and use it whenever possible.

I do find the speed varies a little by about 2-3mph.

For example I was doing about 31mpg when I activated the CC. I was going down an steady incline, 4 gear holds at constant speed. I then go down a steeper dip and then climb. Speed using CC dropped to about 28 and eventually went up to about 32. It has been doing this since I had the car. It does not keep the same speed up when going up or down hills, even if I use say 3rd gear at 30mph. Puzzled. All my previous cars with CC have kept the speed spot on.

It's a heck of a lot better than the system on our vRS.

That varies the speed by as much as 5mph for similar circumstances as you describe.

Downhill I can understand as too high a gear will not use engine braking, but going uphill?

Especially in the right gear and the torque of the engine.