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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 04-20-2013, 11:16 AM   #1
Fitch
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Join Date: Apr 2013
Location: Belgium
Posts: 3
My Ride: E46 318d
Fuel consumption 318d

Hey guys, I have recentely switched from a e39 530d to a e46 318d. Mainly because the I6 diesel had over 200.000 miles on it (and had major costs coming up) and partly because I won't be driving too much long distance trips anymore.

Therefore, I thought that a smaller diesel engine would be financially more attractive than spending thousands on my aged E39..

OR NOT.

Doing about 30 MPG (about 8L/100KM) with my 318d.. BC tells me I'm doing 35 MPG when driving 70 MPH on CC.

Guess that's a little off.. I have had the thermostate replaced (temp wasn't getting in the middle) but the consumption hasn't improved a bit.

Who can help me? The car showed no faults at the dealer's diagnose computer..
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Old 04-20-2013, 12:30 PM   #2
lszlszx
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Join Date: Jan 2013
Location: Socal
Posts: 4,798
My Ride: 328i, XC70
The 1.8 probably has much shorter gearing than the E39. What was your average speed when you got 30 mpg?
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Old 04-20-2013, 03:52 PM   #3
Fitch
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Join Date: Apr 2013
Location: Belgium
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My Ride: E46 318d
Yeah, especially because it is a Touring.. but still, I got the 30 mpg during two weeks of every day home-work trips (about 45 miles pure highway @ 70 mph on CC) and some shorter trips in between..Should be getting much better consumption than this, don't I ?
I was doing about 37 MPG allround with my 530d, so I do think something is wrong :/
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Old 04-21-2013, 07:57 PM   #4
lszlszx
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Well, 30 is definitely low then. I haven't worked on diesels in ages, but a stuck open thermostat would have an effect on any engine's MPG.
A lot more people drive diesels on your side of the pond, you'll probably get
more info on the European forums. Good luck!
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