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35i with DCT & Fuel Consumption.

Specific discussion about the E89 2009 Z4 (sDrive35is, sDrive35i, sDrive30i, sDrive23i)
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mcbutler
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35i with DCT & Fuel Consumption.

Post by mcbutler » Sun Jun 23, 2019 11:22 am

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 :-)
Mark
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Chippie
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35i with DCT & Fuel Consumption.

Post by Chippie » Sun Jun 23, 2019 11:44 am

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:
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Jollyjoiner
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35i with DCT & Fuel Consumption.

Post by Jollyjoiner » Sun Jun 23, 2019 12:08 pm

Keeping the revs under 1500 :rofl: :rofl:
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sunnydays
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35i with DCT & Fuel Consumption.

Post by sunnydays » Sun Jun 23, 2019 1:25 pm

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

keving1
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35i with DCT & Fuel Consumption.

Post by keving1 » Sun Jun 23, 2019 1:35 pm

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:

Chris1712
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35i with DCT & Fuel Consumption.

Post by Chris1712 » Sun Jun 23, 2019 2:37 pm

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.
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Cees Klumper
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35i with DCT & Fuel Consumption.

Post by Cees Klumper » Sun Jun 23, 2019 2:52 pm

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.
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35i with DCT & Fuel Consumption.

Post by Z4M-2006 » Sun Jun 23, 2019 4:11 pm

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.

HillWalker
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35i with DCT & Fuel Consumption.

Post by HillWalker » Sun Jun 23, 2019 7:03 pm

Not much city work but I average about 29mpg, but can't get it above 33 even on a run

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jimbo1958
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35i with DCT & Fuel Consumption.

Post by jimbo1958 » Sun Jun 23, 2019 7:24 pm

Only used to get 17-18 out of my 35i DCT around town.
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warmasice
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35i with DCT & Fuel Consumption.

Post by warmasice » Sun Jun 23, 2019 8:43 pm

Sounds about right. Hilly, traffic with starts and stops.

What do you get on a steady motorway run, that's the question.
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mcbutler
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35i with DCT & Fuel Consumption.

Post by mcbutler » Sun Jun 23, 2019 9:44 pm

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??
Mark
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Smartbear
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35i with DCT & Fuel Consumption.

Post by Smartbear » Sun Jun 23, 2019 10:37 pm

mcbutler wrote: Sun Jun 23, 2019 9:44 pm 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??
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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e89 Sdrive 20i, plenty of mumbo & good economy-the thinking bears z4
e89 Sdrive 30i, this ones busted, pass me another...
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