Is your Mazda 5 thirsty?
#11
03-03-2010, 01:34 PM
[quote=oxter;104303]
It seems to be happy enough in 5/6 gears at relatively slow speeds but are you saying that will add to the sooty stuff in the DPF?
That is exactly what I am saying.
I have no previous experience of diesel car engines but in my experience of marine diesels - both main engine and generators - they always liked being operated at full load rather than part load. In the case of main engines , one of the company main engines completely destroyed its turbo charger simply by operating at too low a speed for too long. This allowed oil build up in the exhaust manifold which ignited when speeding back up. The funnel smoke was always "blacker" at low speed so I imagine it is similar with a car.
So maybe I am a bit sensitive to this issue but unless you do regular motorway driving I think it is a good idea to drive the engine hard periodically even though the engine feels quite comfortable in 5th/6th.
It seems to be happy enough in 5/6 gears at relatively slow speeds but are you saying that will add to the sooty stuff in the DPF?
That is exactly what I am saying.
I have no previous experience of diesel car engines but in my experience of marine diesels - both main engine and generators - they always liked being operated at full load rather than part load. In the case of main engines , one of the company main engines completely destroyed its turbo charger simply by operating at too low a speed for too long. This allowed oil build up in the exhaust manifold which ignited when speeding back up. The funnel smoke was always "blacker" at low speed so I imagine it is similar with a car.
So maybe I am a bit sensitive to this issue but unless you do regular motorway driving I think it is a good idea to drive the engine hard periodically even though the engine feels quite comfortable in 5th/6th.
#12
03-20-2010, 07:17 AM
[quote=Rhodri;104341]
As an experiment, I have kept the engine above 2K revs all the time, instead of trying to get into the highest gear possible. I have tended to drive the car at times before, but now I am just revving it a little more instead. This tank is giving about 3 more to the gallon since.
Probably more down to the DPF not needing to flood the engine instead though.
It seems to be happy enough in 5/6 gears at relatively slow speeds but are you saying that will add to the sooty stuff in the DPF?
That is exactly what I am saying.
I have no previous experience of diesel car engines but in my experience of marine diesels - both main engine and generators - they always liked being operated at full load rather than part load. In the case of main engines , one of the company main engines completely destroyed its turbo charger simply by operating at too low a speed for too long. This allowed oil build up in the exhaust manifold which ignited when speeding back up. The funnel smoke was always "blacker" at low speed so I imagine it is similar with a car.
So maybe I am a bit sensitive to this issue but unless you do regular motorway driving I think it is a good idea to drive the engine hard periodically even though the engine feels quite comfortable in 5th/6th.
That is exactly what I am saying.
I have no previous experience of diesel car engines but in my experience of marine diesels - both main engine and generators - they always liked being operated at full load rather than part load. In the case of main engines , one of the company main engines completely destroyed its turbo charger simply by operating at too low a speed for too long. This allowed oil build up in the exhaust manifold which ignited when speeding back up. The funnel smoke was always "blacker" at low speed so I imagine it is similar with a car.
So maybe I am a bit sensitive to this issue but unless you do regular motorway driving I think it is a good idea to drive the engine hard periodically even though the engine feels quite comfortable in 5th/6th.
As an experiment, I have kept the engine above 2K revs all the time, instead of trying to get into the highest gear possible. I have tended to drive the car at times before, but now I am just revving it a little more instead. This tank is giving about 3 more to the gallon since.
Probably more down to the DPF not needing to flood the engine instead though.
#13
06-04-2010, 04:15 PM
Unfortunately my DPF warning light came on flashing - took it to dealer and charged £77 + vat for a quick reset ( Main Stealer obviously!)
My local mechanic tried to reset the system with his computer when he serviced it - but obviously that didn't do it right.
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rich s.
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03-22-2013 03:30 PM
