isotrack, fleetboard and microlise can bite my shiney metal arse. anything above 30 degrees and i need to sleep thru day then that engine staying on for the cool air con. In italy last week it was 34 degrees and i ran it solid for 11 hours… nothing worse than waking up after 3 hours dripping in sweat and cab feeling like a bloody sauna 
my opinion is that my comfort and sleep is more important than a few litres of derv.
stupidn00b:
isotrack, fleetboard and microlise can bite my shiney metal arse. anything above 30 degrees and i need to sleep thru day then that engine staying on for the cool air con. In italy last week it was 34 degrees and i ran it solid for 11 hours… nothing worse than waking up after 3 hours dripping in sweat and cab feeling like a bloody sauna
If thats the case its time you got a pod on the roof,surely its cheaper 
How do you "cool " a tubo by letting a motor tick over for 2 minutes?
If you turn off a motor the turbo stops within 5 seconds,The exhaust feeds power in to compress the air into the cylinders. The turbo is not going to keep turning due to “inertia” the turbibe/compressor spindle weighs at most 50 grammes and as P= mv (momentum equals mass times velocity)and its also got to pressurise ambient air to 1 or 2 bar the drag on the compressor wheel drags it to a halt in at most 2 seconds.
The turbo stops way before oil pressure drops to zero.And as for cooling we all heard the bull of a turbo running "white " hot. Load of bloody drivel.
If yous paying for the turbos you do. Whatever about this fancy oil wizardry.
.
Bking:
How do you "cool " a tubo by letting a motor tick over for 2 minutes?
If you turn off a motor the turbo stops within 5 seconds,The exhaust feeds power in to compress the air into the cylinders. The turbo is not going to keep turning due to “inertia” the turbibe/compressor spindle weighs at most 50 grammes and as P= mv (momentum equals mass times velocity)and its also got to pressurise ambient air to 1 or 2 bar the drag on the compressor wheel drags it to a halt in at most 2 seconds.The turbo stops way before oil pressure drops to zero.And as for cooling we all heard the bull of a turbo running "white " hot. Load of bloody drivel.
Agreed 100% then the same drivers moan about telematics like fleetboard and isotrak and have no idea of how a modern truck engine works and have to watched because they won’t be told, being a fixer of trucks you could probably write a book on idiotic drivers.
Bking:
drag on the compressor wheel drags it to a halt in at most 2 seconds.
Bullshine. Even the tidgy little turbo on my 1.4 litre turbodiesel car takes 10 seconds to spin down - and that’s when it has been idling for 10 or 20 seconds after being driven. Besides, the issue with oil in the turbo is not that it all drains away while the thing is spinning (it doesn’t) but that it gets cooked as the oil stops circulating the moment the engine stops. Cooked oil doesn’t lubricate very well, and cooked-on deposits don’t do the turbo much good either.
Those nice people at ■■■■■■■ (who know more about turbochargers than any driver or mechanic) recommend a minute or so cooling-down period after hard running - while acknowledging that a minute or two getting parked up will pretty much do the job.
seth 70:
stupidn00b:
isotrack, fleetboard and microlise can bite my shiney metal arse. anything above 30 degrees and i need to sleep thru day then that engine staying on for the cool air con. In italy last week it was 34 degrees and i ran it solid for 11 hours… nothing worse than waking up after 3 hours dripping in sweat and cab feeling like a bloody saunaIf thats the case its time you got a pod on the roof,surely its cheaper
It probably would, but i dont own the truck so aint paying for no pod and i dont pay for the fuel either…
Roymondo:
Bking:
drag on the compressor wheel drags it to a halt in at most 2 seconds.Bullshine. Even the tidgy little turbo on my 1.4 litre turbodiesel car takes 10 seconds to spin down - and that’s when it has been idling for 10 or 20 seconds after being driven. Besides, the issue with oil in the turbo is not that it all drains away while the thing is spinning (it doesn’t) but that it gets cooked as the oil stops circulating the moment the engine stops. Cooked oil doesn’t lubricate very well, and cooked-on deposits don’t do the turbo much good either.
Those nice people at ■■■■■■■ (who know more about turbochargers than any driver or mechanic) recommend a minute or so cooling-down period after hard running - while acknowledging that a minute or two getting parked up will pretty much do the job.
Pull the induction trunking off and see how long it takes the compressor/turbine spindle to stop.After 10 seconds with no lube it should just about be friction welded to the spindle housing.Nice!
Well, mine continues spinning for at least 10 seconds every time I switch off. It hasn’t friction welded itself in five years of use, so I see no reason for it to behave any differently just because the induction trunking was pulled off…
the maoster:
dri-diddly-iver:
What annoys me (in services etc) are those drivers that start up early and leave them ticking over for 30 minutes then decide to go when everyone else has been woken up
Thursday night I parked in Wetherby (the town, not the services) and on Friday morning an Adams driver fired up at 05.15 (it woke me) and it was still sat there ticking over when I left at 06.15! It’s a town centre surrounded by houses ffs! We don’t do ourselves any favours tbh.
That is the exact reason that they stopped trucks parking in Thame on the livestock market. it was a great town centre overnight ■■■■■■■■■■■■, 10 mins from the M40 but there is a line of houses that back onto the market, and sadly there was enough of a stink about trucks sitting with engines running at 4.30 am to force the parking restriction. My mate lives in Thame and told me all about the notices that got posted on the market asking drivers who had to leave early to please fire up and get moving…sadly this request was ignored and the ban was put in place!
on turbo engines the idle for a few mins after hard running is explained quite simply.
the turbo gets very hot.
oil is being pumped through the turbo when engine is running
when engine is stopped oil is no longer being pumped through the turbo
oil breaks down and leaves residue on bearing surfaces and in (usually quite narrow bore) oil feed pipework.
about 80k miles later this residue destroys the bearings due to lack of oil supply compounded by the restricted feed through the feed pipes.
one dead turbo.
ive written this^^^^ from experience with renault 1.9dci engines. the mess some turbos are in after such a low mileage is astonishing. but my laguna 2 has had double frequency oil changes from new and the turbo has always been left a minute to cool and when i serviced it the other day the impeller looked new and no sign of endfload. 150kmiles old. only even needed service items. go figure.
Roymondo:
Bking:
drag on the compressor wheel drags it to a halt in at most 2 seconds.Bullshine. Even the tidgy little turbo on my 1.4 litre turbodiesel car takes 10 seconds to spin down - and that’s when it has been idling for 10 or 20 seconds after being driven. Besides, the issue with oil in the turbo is not that it all drains away while the thing is spinning (it doesn’t) but that it gets cooked as the oil stops circulating the moment the engine stops. Cooked oil doesn’t lubricate very well, and cooked-on deposits don’t do the turbo much good either.
Those nice people at ■■■■■■■ (who know more about turbochargers than any driver or mechanic) recommend a minute or so cooling-down period after hard running - while acknowledging that a minute or two getting parked up will pretty much do the job.
Yep, it’s the degradation of the oil due to heat once the engine is switched off and the turbo bearings are less well lubricates that causes nasty deposits in the oil. And as for the turbo stopping turning after a few seconds, here’s a vid:
So how come we got MMS systems that stop the engine at traffic lights,in a queue etc after 5/10 seconds and refire the engine when you push the clutch or brake if you got to “cool” the turbo for 2 minutes before you turn the engine off?
Bking:
So how come we got MMS systems that stop the engine at traffic lights,in a queue etc after 5/10 seconds and refire the engine when you push the clutch or brake if you got to “cool” the turbo for 2 minutes before you turn the engine off?
That, Sir, is a very good point and I await the idler’s responses with interest.
I must be lucky then.As my merc is on the original turbo.And it’s on 244000kms now.And I don’t let it idle for 2mins.It’s turned of asap.
kr79:
Intresting subject i leave it to run for a minuite or two in the morning while air builds up and i fill out paperwork. Our work is all round town so not a need to run for long to let turbo slow down. If i have break in the cab or waiting always switched off.
The landfill site where i tip has a cafe on site i stop there to get a drink every morning and theres a group of 6-10 drivers from same firm there and they never stop moaning about the firm and they keep asking for a rise and get a no. Outside nealy every one of there motors are sitting there with the engines running.changing the subject maybe somehere have one have you noticed how many new cars have this stop start engine thing in traffic. Maybe ok new but its got to knock the life out of the battery and starter motor over time.
They dont start on the starter motor they use the alternator as a 3 phase motor to kick the engine over (cars)
Bking:
So how come we got MMS systems that stop the engine at traffic lights,in a queue etc after 5/10 seconds and refire the engine when you push the clutch or brake if you got to “cool” the turbo for 2 minutes before you turn the engine off?
Dunno about the other makers, but the in turbocharged Audis and Mercs with the Stop-Start stuff the ECU takes care of this and keeps the engine idling for a short time in the event that it was being driven hard immediately before the stop.