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2014 F30 335i losing power with age
15-01-2020, 09:55 PM,
#1
2014 F30 335i losing power with age
Hi all,

So my 2014 F30 335i has definitely lost a lot of power as it’s aged. It’s at 130,000km with no obvious fault other than just lacking the power and torque I know it used to have. I have taken meticulous care of it over its life and have always ensured every small noise and squeak was fixed at the dealership.

I really have no clue as to what to look at to restore its performance to its glory days. It’s stock standard - I wouldn’t want to do any performance mods. The spark plugs were last changed at about 60,000km. Would that be an obvious first thing to replace? Obviously I don’t want to incur huge costs just replacing parts willy nilly. Any clues where to look? As I stated, the car is in excellent condition - no obvious signs of malfunctioning parts or leaks.

Thanks!
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15-01-2020, 10:01 PM,
#2
RE: 2014 F30 335i losing power with age
Hey Bud,

Mine is on 100k kms and stronger than the day I got her..

Check for a Carbon Clean and I strongly consider doing a downpipe. That should help free up power. Is the power loss drastic? You could have a boost leak maybe?

Current:
'14 F30 335i MSport Alpine White III, Coral Red, Sat Nav, iDrive touch, PDC + reverse cam, Harman Kardon, N55 230wkw | 477wnm Rogue Performance Downpipe
'16 F30 318i LCI Manual, Alpine White III, Black Leather
[Image: banner%20final_1261154562_8282635603.png]
[Image: m_fanatic2_8387882621.jpg]
Mods: Optic Blue Lamin-X fogs, VPS light shields, CF Splitters, Mirrors, Ducktail spoiler, Aluminium interior trim upgrades...

Retired BMWs:
'12 F30 320d
'12 F20 118i
'09 E90 LCI 320i M-Sport
'07 E90 320i Excl
'91 E30 325iS Evo I
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15-01-2020, 10:03 PM,
#3
2014 F30 335i losing power with age
Yes it would be a good idea to change the spark plugs

Also check things like
Vacuum pipes for tears
Charge pipe and boost pipes for leaks
Catalytic converter for any signs of blockage
Etc
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16-01-2020, 08:41 PM,
#4
RE: 2014 F30 335i losing power with age
(15-01-2020, 10:01 PM)cOlDFuSiOn Wrote: Hey Bud,

Mine is on 100k kms and stronger than the day I got her..

Check for a Carbon Clean and I strongly consider doing a downpipe. That should help free up power. Is the power loss drastic? You could have a boost leak maybe?

Thanks - I actually did a carbon clean about 20,000km ago. They said it wasn’t too bad and was actually prettt clean for the mileage. Would boost leaks cause a CEL?

I was considering a DP but figured I needed to replace the CP before I did that.
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16-01-2020, 08:42 PM,
#5
RE: 2014 F30 335i losing power with age
(15-01-2020, 10:01 PM)cOlDFuSiOn Wrote: Hey Bud,

Mine is on 100k kms and stronger than the day I got her..

Check for a Carbon Clean and I strongly consider doing a downpipe. That should help free up power. Is the power loss drastic? You could have a boost leak maybe?

Btw I wouldn’t say drastic loss. I’d hazard a guess that it’s probably 20-30% down on power. That thrill of putting foot and being pushed into the seat is gone if you know what I mean.
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16-01-2020, 08:43 PM,
#6
RE: 2014 F30 335i losing power with age
(15-01-2020, 10:03 PM)Danny@DSCmotorsport Wrote: Yes it would be a good idea to change the spark plugs

Also check things like
Vacuum pipes for tears
Charge pipe and boost pipes for leaks
Catalytic converter for any signs of blockage
Etc

Thanks bud. What would be the easiest way to check for a catalytic blockage?
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17-01-2020, 09:24 AM,
#7
RE: 2014 F30 335i losing power with age
It might just be in your head. Bluebiggrin You might just be used to the power. the other way to check is to dyno and look at whether the graph is consistent with other similar stock vehicles. The number might notbe the same but the shape of the graph should be very similar.

No, no, he didn’t slam you, he didn’t bump you, he didn’t nudge you… he *rubbed* you. And rubbin, son, is racin’. – Harry Hogge, Days of Thunder

Current Rides
2007 530d MSport (DP, 76mm exhaust, RK Motion tune, OEM M6 wheels)
2012 X1 2.0D MSport
1996 200 Si Camry
[Image: photo%20from%20sashchern_5592516823.jpg]
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17-01-2020, 06:45 PM,
#8
RE: 2014 F30 335i losing power with age
If you want to confirm whether it's in your head or there is actually a problem, I reckon a dyno run would be a good place to start.
20 - 30% sounds pretty drastic though, after some time one certainly gets use to the power of a vehicle - when I first got my bike it felt like the fastest vehicle on the road and now that is not the case.
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17-01-2020, 09:30 PM,
#9
RE: 2014 F30 335i losing power with age
I guess a dyno it is!
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17-01-2020, 11:20 PM,
#10
RE: 2014 F30 335i losing power with age
A boost leak would not necessarily throw a Cel, I agree that a Dyno run is the only way to know what the car is putting down but we tend to know our cars as well so after many years we do know when it feels down. Like on hot days I really do know my car feels very slow.

Charge pipe will pop, but I have a downpipe only on mine, stock CP still holding up, for now I guess..

For reference my car made between 214-222wkw stock. Torque was always low on mine around 410ish range though. After downpipe made 230wkw/477nm at 95k kms.

Consider a downpipe either way, wakes the car up and sounds so much better!

Current:
'14 F30 335i MSport Alpine White III, Coral Red, Sat Nav, iDrive touch, PDC + reverse cam, Harman Kardon, N55 230wkw | 477wnm Rogue Performance Downpipe
'16 F30 318i LCI Manual, Alpine White III, Black Leather
[Image: banner%20final_1261154562_8282635603.png]
[Image: m_fanatic2_8387882621.jpg]
Mods: Optic Blue Lamin-X fogs, VPS light shields, CF Splitters, Mirrors, Ducktail spoiler, Aluminium interior trim upgrades...

Retired BMWs:
'12 F30 320d
'12 F20 118i
'09 E90 LCI 320i M-Sport
'07 E90 320i Excl
'91 E30 325iS Evo I
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18-01-2020, 09:41 AM,
#11
RE: 2014 F30 335i losing power with age
i think the first item that the car was looked after by a dealer might be the first problem.... then all the other items the guys said


a BMW in my family that was under plan till 75000km, possibly did not even have an oil change , or plugs done, once my sibling mentioned the car was out of plan... Long Drive followed by boiling hot oil drain... changed oil, not to mention the condition of oil that came out... plugs , oil and air filter, felt almost like the car started breathing again ...
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18-01-2020, 12:58 PM,
#12
RE: 2014 F30 335i losing power with age
20 - 30% is a big drop in power. Put it on a dyno and see what it's making.

Plugs may need to be changed. It's never a bad thing putting in fresh plugs in your car.

As Coidfusion says, fitting a downpipe wakes the car up nicely. I ran with a downpipe and stock charge pipe, no software for 2 years. I've only recently added a charge pipe. You won't be disappointed

Current:
2015 Chevrolet Utility
2015 335i M Sport - 264kw 534nm
2018 VW Polo Vivo

EX:
2014 320i M Sport
2013 320d M Sport
2006 Subaru Impreza STI - 12.5s / 257kw 508nm
2013 435i M Sport - 221kw 400nm
2011 Golf 6 GTI DSG - 12.9s / 214kw 465nm
2012 VW Jetta 6 1.4TSi
2011 Audi 2.0T Sportback
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