Sainsbury's Lorries Today - Sloooooooow
Discussion
GC8 said:
I cant find an HGV tachometer picture in Google - the green area of higher efficiency usually runs out about 5mph before the limited top speed. The further out you have to venture to reach 56mph (or whatever your limit was), then the greater the saving if limited to 50mph.
Not in my experience.The "green band" goes from 1000 to 1500rpm on pretty much all trucks. 56mph sits at 1200rpm in Renaults, Volvos, Ivecos, Dafs and Scanias. Mercedes seem to sit at 1350rpm for the same speed. To drop to 50mph, the gearboxes in Mercedes (sainsburys motor of choice) keeps the 'box shifting between 11th/12th gear as it's just out of range for both gears.
I doubt their fuel economy is much improved due to the f
king about and "catching up" that the 'box does in 11th gear. No doubt (I'll happily be corrected on this) Sainsburys have had the kickdown/manual selection disabled on their trucks which won't help this, as the driver can't over-ride the system.GC8 said:
My experience differs from yors, with both Mercedes and Volvo being out by a fair margin on their limit.
I'll double check tomorrow in the Volvo, but we're bang in the centre of the green band at top cruising speed which is a Sat-Nav 56MPH.The Mercs have gone now, but they were quite a bit higher at "their 56mph" which was actually a Sat-Nav confirmed 54mph.
I suppose that it depends what market the vehicles were intended for. My experience is principally with rigid insulated tippers. Technically dual purpose vehicles these were either 8x4 (FM12, CF380) or 6x4 (2628, CF360, FM9) and not one of them could reach its top limited speed whilst in the green.
GC8 said:
I suppose that it depends what market the vehicles were intended for. My experience is principally with rigid insulated tippers. Technically dual purpose vehicles these were either 8x4 (FM12, CF380) or 6x4 (2628, CF360, FM9) and not one of them could reach its top limited speed whilst in the green.
That'll be the difference. These are effectively Artic units for general haulage (although the company reckons it's not general haulage.Life Saab Itch said:
Not in my experience.
The "green band" goes from 1000 to 1500rpm on pretty much all trucks. 56mph sits at 1200rpm in Renaults, Volvos, Ivecos, Dafs and Scanias. Mercedes seem to sit at 1350rpm for the same speed. To drop to 50mph, the gearboxes in Mercedes (sainsburys motor of choice) keeps the 'box shifting between 11th/12th gear as it's just out of range for both gears.
I doubt their fuel economy is much improved due to the fking about and "catching up" that the 'box does in 11th gear. No doubt (I'll happily be corrected on this) Sainsburys have had the kickdown/manual selection disabled on their trucks which won't help this, as the driver can't over-ride the system.
We've got rid of all the Mercs now, replaced with new Volvos...The "green band" goes from 1000 to 1500rpm on pretty much all trucks. 56mph sits at 1200rpm in Renaults, Volvos, Ivecos, Dafs and Scanias. Mercedes seem to sit at 1350rpm for the same speed. To drop to 50mph, the gearboxes in Mercedes (sainsburys motor of choice) keeps the 'box shifting between 11th/12th gear as it's just out of range for both gears.
I doubt their fuel economy is much improved due to the f
king about and "catching up" that the 'box does in 11th gear. No doubt (I'll happily be corrected on this) Sainsburys have had the kickdown/manual selection disabled on their trucks which won't help this, as the driver can't over-ride the system.Both have no issue holding 12th at 50mph at all.. The Volvo will pull it uphill fully loaded whereas the Mercs knocked it into 11th often. But, the Volvos are more powerful.
It's at 40mph that it's odd as the Mercs took 12th wheras the Volvos sit in 11th and are reving a tad high.
There are no restrictions on gearboxes, kick down works in auto as does manual mode. We're encouraged to use manual mode in the odd occasion that would benefit.. Like up and down hills on a main road where the 'box can't predict what the road will do next.
The volvo should take 40 in 12th with no major load on the go pedal.It should pretty much eco roll too with your foot off.Mainly talking out and about there mind.
In towns 40 and 12th probably isn't going to happen,the box knows it's not time to kick back and cruise when in town.
Damn fine auto box on the Volvo.
In towns 40 and 12th probably isn't going to happen,the box knows it's not time to kick back and cruise when in town.
Damn fine auto box on the Volvo.
The Volvo will not automatically put it in 12th at 40.. You can manually put it in and then switch back to auto and it will hold it (at 900rpm) but a slight sniff of a hill or requiring more throttle and it knocks back to 11th.. I suppose the trade off is lower revs cruising at 50.
For it to hit 12th itself you need to be doing 41/42.
For it to hit 12th itself you need to be doing 41/42.
XitUp said:
Surely it's easier for a truck to overtake something doing 50 than something doing 55.632 mph, so this will reduce elephant racing?
But if the useless car drivers don't spot the lorry in their lane ahead, it will cause a bit of congestion as they all try to get out of that lane at the last minute.philmots said:
The Volvo will not automatically put it in 12th at 40.. You can manually put it in and then switch back to auto and it will hold it (at 900rpm) but a slight sniff of a hill or requiring more throttle and it knocks back to 11th.. I suppose the trade off is lower revs cruising at 50.
For it to hit 12th itself you need to be doing 41/42.
What map is your gearbox ?The I shift has different map settings set at time of purchase.For it to hit 12th itself you need to be doing 41/42.
We have had Volvos with I shift for some 7 or so years now.
The only ones that wouldn't do 12th@40 were the 2004 460's.
(in fact they pretty bad when we got turned down to 54mph gps 52mph they wouldn't hold 54 without constantly flicking 11th 12th all the time)
Since then we are running 480's and 500's and all will slip into 12th at 40 if cruising on the singles and using eco roll too.
In towns or in traffic they won't do 12th@40.
Different driving conditions.
- The map on our boxes is set so they won't be up and down the box changing 11th 12th set @54mph like the early 460's did.Maybe that makes the difference ?
Edited by Panda76 on Thursday 15th March 17:40
Hunitiing for fuel in the past, running at 50 mph seriously increases mpg, used to have to do it sometimes in my last job, mainly because we were forced to play fuel card roulette, my Daf 95 xf 430 does 56 on the tacho at 1500 rpm, would like to know the true rpm as i seem to overtake ALOT.
P.S, My bezza does the continent and has strict instructions never to fill up in the uk and to run at 50 in the uk as well.
P.S, My bezza does the continent and has strict instructions never to fill up in the uk and to run at 50 in the uk as well.
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