35i with DCT & Fuel Consumption.

M

mcbutler

Veteran
 Plymouth
Hi all,

Some of you may have seen my earlier post regarding my 35i and 'shift indicators' when a DCT box is fitted.
This post was made as I was somewhat dismayed at getting 16mpg around town, I live in Plymouth and it is extremely 'hilly'.
The general consensus was no shift indicators are available when DCT is fitted.
So, I refilled the car to the brim and have since driven her only in manual mode using the paddles, so far I am getting over 22 mpg around town!! This is simply by keeping revs under 1500, the DCT will not let the engine labour even in manual mode so no chance of engine damage.
I really enjoy using the paddles and the extra mpg is a bonus, not worked it out exactly but mpg has increased by 40% ish - at the pump over a full tank that's a significant saving.

Of course we all know that SMILES PER GALLON are more important but sometimes you have to be frugal.....

Looking forward to seeing some of you at zedfest in a few days :-)
 
I have to agree with your assumptions although I personally haven’t checked the MPG only have had mine about 6 weeks, but I have felt that the engine does rev higher than needed before changing up, having said that though it does sound great :driving:
 
Hi OP,

Have you considered switching the car off. Dis engaging the handbrake, shifting in to neutral and having someone push or tow the car while you are in it?

This will give you even higher mpg and it works anywhere! :D
 
Get an OBDll cable & code off 3 of your cylinders so that you have a 1.5 litre single turbo engine and double your mpg :rofl: :rofl:
 
Have you checked all your brake callipers are ok? You might have a sticking caliper or something? FWIW my long term average for my 35iS is 28.2mpg, but even when I lived in Bath/Bristol which are also horrendously busy and hilly I would get 22-24! No manual intervention required.
 
Depending on your service history and mileage, cleaning your intake valves of carbon deposits may bring significant further gains in mileage and performance, and idle running characteristics.
 
Mine did around 26mpg on a daily crappy commute of hilly 6 miles B roads..40mpg could be had on a quiet run.

You should be getting better than that.
 
Sounds about right. Hilly, traffic with starts and stops.

What do you get on a steady motorway run, that's the question.
 
Hi All,
Loving the sarcasm :fuelfire: only had the car 8 days and it struck me immediately that it was revving far too high when climbing the hills we have around here, especially on a hill start. Car only has 24k miles on it, full BMW history done yearly regardless and one month ago a full inspection from BMW with no faults found (ok stop laughing). I am familiar with Bristol but the hills here are another level, the one at the end of my road is hard enough to walk up, no joke. I tried applying the brakes as hard as I could and applying the handbrake whilst footbrake full on. Left it overnight on the level, in the morning I released the handbrake and it pushed easily, so no binding. WIll find out what a long run gives me on the way to ZedFest in July :-)
On the subject of inlet port coking, it just struck me that running a can of EGR cleaner (coke remover) through the inlet system once a month might be a good idea, any thoughts??
 
mcbutler said:
Hi All,
Loving the sarcasm :fuelfire: only had the car 8 days and it struck me immediately that it was revving far too high when climbing the hills we have around here, especially on a hill start. Car only has 24k miles on it, full BMW history done yearly regardless and one month ago a full inspection from BMW with no faults found (ok stop laughing). I am familiar with Bristol but the hills here are another level, the one at the end of my road is hard enough to walk up, no joke. I tried applying the brakes as hard as I could and applying the handbrake whilst footbrake full on. Left it overnight on the level, in the morning I released the handbrake and it pushed easily, so no binding. WIll find out what a long run gives me on the way to ZedFest in July :-)
On the subject of inlet port coking, it just struck me that running a can of EGR cleaner (coke remover) through the inlet system once a month might be a good idea, any thoughts??
Click to expand...

Unfortunately that’s not going to clear away any carbon from the inlet ports or valves as it’s a direct injection engine and it only has air flowing through the inlet manifold :?
Rob
 
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