Options for increasing 330d/335d MPG whilst keeping performance

messyhead86 · 09-07-2018, 10:36 AM

My 335d is coming up to 180k and starting to get a bit tired. I've owned it for the last 60k and do a lot of miles, 800+ week. I like the way the car drives, how quick it is and the ease in which it does both. I used to get around 38-40 mpg sat at 80-85mph on the motorway where I spend 75% of my time, but this has started to fall.

I've reached the point where I don't want to put any more money into the car and risk losing it all with the engine or gearbox going and being stuck with a large repair bill. And so would rather sell it and get a newer and lower mileage one. I've looked at the F30 330d which with a stage 1 remap through avon tuning would get up to 320bhp without too many modifications but I can't justify spending £15-20k on a car for work that will inevitably get scratched and damaged driving down narrow country lanes.

A lot of tunes state they give x amount of economy increase but that'll always be best case and there are a lot of contributing factors which will affect this. What are the real world figures that people have been able to achieve driving at a normal pace rather than sitting at 50 on the motorway in the slow lane. What options are there for the e90 330/335d's that will actually increase economy?

Any help is greatly apppreciated.

Hockey13 · 09-07-2018, 02:04 PM

have you replaced your MAF? I was experiencing low mpgs, but had no other signs. replaced MAF since it was only 25$ for genuine and mpgs are back up to normal. I'm at 175k mi.

Andy198712 · 09-08-2018, 05:39 AM

Do you mean MAP? Can’t see a MAF being 25 bucks?? Need a link if so

dmanb2b · 09-08-2018, 07:55 AM

Quote:

Originally Posted by Andy198712

Do you mean MAP? Can’t see a MAF being 25 bucks?? Need a link if so

Get them while they are hot...price on FCP euro is already back up

reputable seller

https://www.eeuroparts.com/Parts/128...r-13628509725/

not sure about this one

https://www.amazon.com/dp/B00KWD5N98..._UzMKBbP02DJ5P

rbreding · 09-08-2018, 09:07 PM

Yep they were $25-$35 for at least a month virtually nationwide. Got 2 extras as backups. Also the thermostat is a question when MPG suffers.

Andy198712 · 09-09-2018, 03:47 AM

Quote:

Originally Posted by dmanb2b

Get them while they are hot...price on FCP euro is already back up

reputable seller

https://www.eeuroparts.com/Parts/128...r-13628509725/

not sure about this one

https://www.amazon.com/dp/B00KWD5N98..._UzMKBbP02DJ5P

the UK version......

https://www.eurocarparts.com/ecp/c/B...2f3e7ca&000009

Hockey13 · 09-09-2018, 04:11 AM

Quote:

Originally Posted by Andy198712

Do you mean MAP? Can’t see a MAF being 25 bucks?? Need a link if so

nope. MAF was 25 from the genuine BMW I with lifetime warranty

Andy198712 · 09-09-2018, 04:28 PM

Quote:

Originally Posted by Hockey13

nope. MAF was 25 from the genuine BMW I with lifetime warranty

I’d literally just buy one as a spare at that price!

Hockey13 · 09-09-2018, 04:33 PM

Quote:

Originally Posted by Andy198712

Quote:

Originally Posted by Hockey13

nope. MAF was 25 from the genuine BMW I with lifetime warranty

I’d literally just buy one as a spare at that price!

it's lifetime, so why buy a second when it's free? lol

AlpineX · 09-09-2018, 05:18 PM

BMW NW in WA still on old pricing with a discount. Lowest I have seen

Andy198712 · 09-10-2018, 03:54 AM

Quote:

Originally Posted by Hockey13

it's lifetime, so why buy a second when it's free? lol

lol i meant have one in your tool box encase your cars original fit one fails

M5_1of400 · 09-10-2018, 07:51 AM

Quote:

Originally Posted by rbreding

Yep they were $25-$35 for at least a month virtually nationwide. Got 2 extras as backups. Also the thermostat is a question when MPG suffers.

Same here.. I got them from FCPEuro.. I think I paid $26 a piece.

Hockey13 · 09-10-2018, 06:16 PM

Quote:

Originally Posted by Andy198712

Quote:

Originally Posted by Hockey13

it's lifetime, so why buy a second when it's free? lol

lol i meant have one in your tool box encase your cars original fit one fails

not sure I'm following you but sure? lol

I got the new one, which is genuine, and have my old one in the "toolbox"

if the new completely went out I can use the old until the replacement arrives. so I didn't see a need to paying for a brand new one to sit in a box to save me a couple days shipping.

rkstar9 · 09-17-2018, 06:28 PM

Quote:

Originally Posted by Hockey13

have you replaced your MAF? I was experiencing low mpgs, but had no other signs. replaced MAF since it was only 25$ for genuine and mpgs are back up to normal. I'm at 175k mi.

Having the same issue here as OP

how low where your low MPG's?

Hockey13 · 09-17-2018, 06:31 PM

Quote:

Originally Posted by rkstar9

Quote:

Originally Posted by Hockey13

have you replaced your MAF? I was experiencing low mpgs, but had no other signs. replaced MAF since it was only 25$ for genuine and mpgs are back up to normal. I'm at 175k mi.

Having the same issue here as OP

how low where your low MPG's?

went from 36 to 30 ish. 32 trying hard.

lnxguy · 09-18-2018, 10:24 AM

t-stat is probably the biggest culprit, and your right foot.

Chief Orman · 09-18-2018, 11:23 PM

replace your motor mounts...huge reduction in noise, vibration and harshness.

Stepping back I think you have it all wrong. Based on the scenario you laid out seems to me that you are actually on the cusp of dropping approximately 10 to 20 grand into your car. to do otherwise would be disloyal to the chat

09-07-2018, 10:36 AM	#1
messyhead86 Enlisted Member 9 Rep 31 Posts Drives: 335d M Sport Join Date: Apr 2017 Location: uk iTrader: (0)	Options for increasing 330d/335d MPG whilst keeping performance My 335d is coming up to 180k and starting to get a bit tired. I've owned it for the last 60k and do a lot of miles, 800+ week. I like the way the car drives, how quick it is and the ease in which it does both. I used to get around 38-40 mpg sat at 80-85mph on the motorway where I spend 75% of my time, but this has started to fall. I've reached the point where I don't want to put any more money into the car and risk losing it all with the engine or gearbox going and being stuck with a large repair bill. And so would rather sell it and get a newer and lower mileage one. I've looked at the F30 330d which with a stage 1 remap through avon tuning would get up to 320bhp without too many modifications but I can't justify spending £15-20k on a car for work that will inevitably get scratched and damaged driving down narrow country lanes. A lot of tunes state they give x amount of economy increase but that'll always be best case and there are a lot of contributing factors which will affect this. What are the real world figures that people have been able to achieve driving at a normal pace rather than sitting at 50 on the motorway in the slow lane. What options are there for the e90 330/335d's that will actually increase economy? Any help is greatly apppreciated.
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09-07-2018, 02:04 PM	#2
Hockey13 Second Lieutenant 84 Rep 263 Posts Drives: 2011 335d M-Sport Join Date: Mar 2015 Location: Southern California iTrader: (0)	have you replaced your MAF? I was experiencing low mpgs, but had no other signs. replaced MAF since it was only 25$ for genuine and mpgs are back up to normal. I'm at 175k mi.
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09-08-2018, 05:39 AM	#3
Andy198712 Major 145 Rep 1,007 Posts Drives: 2010 E91 325d Join Date: Mar 2017 Location: Cornwall iTrader: (0)	Do you mean MAP? Can’t see a MAF being 25 bucks?? Need a link if so
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09-08-2018, 09:07 PM	#5
rbreding Second Lieutenant 54 Rep 238 Posts Drives: 328d, 335d, x5d Join Date: Sep 2016 Location: OKC iTrader: (0)	Yep they were $25-$35 for at least a month virtually nationwide. Got 2 extras as backups. Also the thermostat is a question when MPG suffers.
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09-09-2018, 05:18 PM	#10
AlpineX Captain 246 Rep 776 Posts Drives: Diesel Join Date: Sep 2015 Location: US iTrader: (0)	BMW NW in WA still on old pricing with a discount. Lowest I have seen
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09-18-2018, 10:24 AM	#16
lnxguy Lieutenant Colonel 357 Rep 1,723 Posts Drives: 2009 335D Join Date: Jun 2016 Location: Barrie iTrader: (1)	t-stat is probably the biggest culprit, and your right foot. __________________ '09 335D
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09-18-2018, 11:23 PM	#17
Chief Orman Major 671 Rep 1,442 Posts Drives: 335D 2010 Join Date: Jun 2013 Location: East Bay, Nor Cal iTrader: (0)	replace your motor mounts...huge reduction in noise, vibration and harshness. Stepping back I think you have it all wrong. Based on the scenario you laid out seems to me that you are actually on the cusp of dropping approximately 10 to 20 grand into your car. to do otherwise would be disloyal to the chat
	Appreciate 0 Quote