Mine scares horses. Had some snooty cow shout at me the other week. Wouldn’t mind but I was in a car park. 
bigvern1:
Mine scares horses. Had some snooty cow shout at me the other week. Wouldn’t mind but I was in a car park.
Haven’t I told you before about showing strange women your retarder in car parks?
Juddian:
As GasGas mentioned several posts above, what you expect isn’t going to happen unless the lorry has a proper retarder or engine compression brake, if it only has an exhaust brake then the brakes are going to be needed to restrain overspeed/overrev whther you apply them or the lorry itself applies them.Thinking sensibly even if you had a full Jacob or retarder there would come a point where even that wouldn’t be enough, indeed those who have used goood retarders, and Volvo’s 3 position effort is as good as most, will have had to turn them down to prevent drive axle lock up when lightly loaded or in slippery conditions.
Currently driving an MAN (must have upset someone) fitted with satans autobox, if you press the autoretard button it will automatically downchange to a low a gear as possible as well as automatically apply the exhauster (fair effort for an exhaustbrake only), and keep downchanging as you slow up, invariably i switch the autoretard function off when it gets down to 7/8th as the next downchanges can be jerky, by then i’m usually planning a junction approach anyway so take over manually.
Going down steep motorway inclines i still have to gently brake to keep it below 60, it will downchange to 11th and sometimes 10th as it tries to slow but 58mph in 10th sees the revs high enough that by then i’m gently braking anyway.
right!!
i’m not expecting to be held back by the exhaust brake or any other sort of retarder in any situation, i fully get how to use the exhaust brake and what it’s capable of, maybe i shouldn’t of mentioned the exhaust brake to start with!!
all i’m really wanting to know is whether an auto will up shift without the accelerator being pressed?
cheers steve
stevieboy308:
Juddian:
As GasGas mentioned several posts above, what you expect isn’t going to happen unless the lorry has a proper retarder or engine compression brake, if it only has an exhaust brake then the brakes are going to be needed to restrain overspeed/overrev whther you apply them or the lorry itself applies them.Thinking sensibly even if you had a full Jacob or retarder there would come a point where even that wouldn’t be enough, indeed those who have used goood retarders, and Volvo’s 3 position effort is as good as most, will have had to turn them down to prevent drive axle lock up when lightly loaded or in slippery conditions.
Currently driving an MAN (must have upset someone) fitted with satans autobox, if you press the autoretard button it will automatically downchange to a low a gear as possible as well as automatically apply the exhauster (fair effort for an exhaustbrake only), and keep downchanging as you slow up, invariably i switch the autoretard function off when it gets down to 7/8th as the next downchanges can be jerky, by then i’m usually planning a junction approach anyway so take over manually.
Going down steep motorway inclines i still have to gently brake to keep it below 60, it will downchange to 11th and sometimes 10th as it tries to slow but 58mph in 10th sees the revs high enough that by then i’m gently braking anyway.
right!!
i’m not expecting to be held back by the exhaust brake or any other sort of retarder in any situation, i fully get how to use the exhaust brake and what it’s capable of, maybe i shouldn’t of mentioned the exhaust brake to start with!!
all i’m really wanting to know is whether an auto will up shift without the accelerator being pressed?
cheers steve
Sorry mate, didn’t mean to waste your time.
stevieboy308:
Juddian:
As GasGas mentioned several posts above, what you expect isn’t going to happen unless the lorry has a proper retarder or engine compression brake, if it only has an exhaust brake then the brakes are going to be needed to restrain overspeed/overrev whther you apply them or the lorry itself applies them.Thinking sensibly even if you had a full Jacob or retarder there would come a point where even that wouldn’t be enough, indeed those who have used goood retarders, and Volvo’s 3 position effort is as good as most, will have had to turn them down to prevent drive axle lock up when lightly loaded or in slippery conditions.
Currently driving an MAN (must have upset someone) fitted with satans autobox, if you press the autoretard button it will automatically downchange to a low a gear as possible as well as automatically apply the exhauster (fair effort for an exhaustbrake only), and keep downchanging as you slow up, invariably i switch the autoretard function off when it gets down to 7/8th as the next downchanges can be jerky, by then i’m usually planning a junction approach anyway so take over manually.
Going down steep motorway inclines i still have to gently brake to keep it below 60, it will downchange to 11th and sometimes 10th as it tries to slow but 58mph in 10th sees the revs high enough that by then i’m gently braking anyway.
right!!
i’m not expecting to be held back by the exhaust brake or any other sort of retarder in any situation, i fully get how to use the exhaust brake and what it’s capable of, maybe i shouldn’t of mentioned the exhaust brake to start with!!
all i’m really wanting to know is whether an auto will up shift without the accelerator being pressed?
cheers steve
I’ll try it tomorrow.
The answer to your question is NO.
Juddian:
stevieboy308:
Juddian:
As GasGas mentioned several posts above, what you expect isn’t going to happen unless the lorry has a proper retarder or engine compression brake, if it only has an exhaust brake then the brakes are going to be needed to restrain overspeed/overrev whther you apply them or the lorry itself applies them.Thinking sensibly even if you had a full Jacob or retarder there would come a point where even that wouldn’t be enough, indeed those who have used goood retarders, and Volvo’s 3 position effort is as good as most, will have had to turn them down to prevent drive axle lock up when lightly loaded or in slippery conditions.
Currently driving an MAN (must have upset someone) fitted with satans autobox, if you press the autoretard button it will automatically downchange to a low a gear as possible as well as automatically apply the exhauster (fair effort for an exhaustbrake only), and keep downchanging as you slow up, invariably i switch the autoretard function off when it gets down to 7/8th as the next downchanges can be jerky, by then i’m usually planning a junction approach anyway so take over manually.
Going down steep motorway inclines i still have to gently brake to keep it below 60, it will downchange to 11th and sometimes 10th as it tries to slow but 58mph in 10th sees the revs high enough that by then i’m gently braking anyway.
right!!
i’m not expecting to be held back by the exhaust brake or any other sort of retarder in any situation, i fully get how to use the exhaust brake and what it’s capable of, maybe i shouldn’t of mentioned the exhaust brake to start with!!
all i’m really wanting to know is whether an auto will up shift without the accelerator being pressed?
cheers steve
Sorry mate, didn’t mean to waste your time.
i wasn’t being arsey fella, sorry if it came across that way, no time wasted 
cheers for your input.
FarnboroughBoy11:
stevieboy308:
Juddian:
As GasGas mentioned several posts above, what you expect isn’t going to happen unless the lorry has a proper retarder or engine compression brake, if it only has an exhaust brake then the brakes are going to be needed to restrain overspeed/overrev whther you apply them or the lorry itself applies them.Thinking sensibly even if you had a full Jacob or retarder there would come a point where even that wouldn’t be enough, indeed those who have used goood retarders, and Volvo’s 3 position effort is as good as most, will have had to turn them down to prevent drive axle lock up when lightly loaded or in slippery conditions.
Currently driving an MAN (must have upset someone) fitted with satans autobox, if you press the autoretard button it will automatically downchange to a low a gear as possible as well as automatically apply the exhauster (fair effort for an exhaustbrake only), and keep downchanging as you slow up, invariably i switch the autoretard function off when it gets down to 7/8th as the next downchanges can be jerky, by then i’m usually planning a junction approach anyway so take over manually.
Going down steep motorway inclines i still have to gently brake to keep it below 60, it will downchange to 11th and sometimes 10th as it tries to slow but 58mph in 10th sees the revs high enough that by then i’m gently braking anyway.
right!!
i’m not expecting to be held back by the exhaust brake or any other sort of retarder in any situation, i fully get how to use the exhaust brake and what it’s capable of, maybe i shouldn’t of mentioned the exhaust brake to start with!!
all i’m really wanting to know is whether an auto will up shift without the accelerator being pressed?
cheers steve
I’ll try it tomorrow.
cheers fella
Santa:
The answer to your question is NO.
cheers santa
I don’t think it will change up after having changed down to increase engine braking either but I’ve got a feeling, from memory, the astronic will go into some sort of protective safety mode over a certain rpm either disenaging the clutch, going into neutral or both. I’m not going to test one to destruction to find out though.
All the auto systems are pretty idiot-proof, this being the idea behind them, it’s difficult-ish, for the operator to cause damage from intervention or lack of it in most normally encountered scenarios.
switchlogic:
bigvern1:
Mine scares horses. Had some snooty cow shout at me the other week. Wouldn’t mind but I was in a car park.Haven’t I told you before about showing strange women your retarder in car parks?
She asked for it!
stevieboy308:
hi all,it’s been a while since i’ve drove an auto, so cant remember, or even remember if i did know!
if you’re going down a hill that the exhaust brake can’t hold you back on, what happens at max revs? will it up shift into the next gear or would it over speed the engine?
cheers
If you leave it in auto its shifts down if you dont have enough revs and if you have to many and its going near the red it will go up, it will never let the engine rev to high. This is on a scania 3 pedal auto, cant remember what other lorries are like but think they all work the same in the sense they wont let the engine rev dangerously high.
The eurocargo upshifts even when being held nicely in the yellow 
it’s even mentioned in the handbook. On my FH (the only auto motor I’ve driven with an engine brake), pressing the down button on the VEB stalk sets the speed and the electrickery does the rest, however for the steepest of hills, fully freighted, you need to be going at a sensible pace so the unit can keep control. As for changing up, I guess it would as a last resort, but I’ve never had it happen, I have started to lose traction and I’m pretty sure the EBS helped out that time. Pretty darned good these I-Shifts.
Auto box should never upshift when exhaust brake is being used as ECU monitors fuel supply and throttle position.As no fuel is being supplied to injectors(except for cooling) and throttle is shut box ecu should hold the gear your in.
I tried it out today and I can conclude that when loaded going down hill in automatic without the exhaust brake on and without touching the accelerator, it does indeed shift up.
FarnboroughBoy11:
I tried it out today and I can conclude that when loaded going down hill in automatic without the exhaust brake on and without touching the accelerator, it does indeed shift up.
interesting, cheers for that fella 