[Chappers 71]

e92 335i auto on duel carriageway & motorway with free flowing traffic, me the missus, an overnight bag & the 42kilo Alsatian puppy

[Silver Streek]

Chappers you just made me turn my phone upside down 😂

[Chappers 71]

Originally Posted by Silver Streek

Chappers you just made me turn my phone upside down 😂

FTFY

[Tambohamilton]

47.8mpg, Trowbridge to fort William, with some tomfoolery on the good bits. E91 330d (M57)

[MrSweet1991]

23MPG in a 330d lmao

[DriverLDN]

Best has probably been 34mpg on a long motorway run. The average is in my signature.

[wolly440]

If you have to start worrying about MPG, you need to start thinking about a new car

[Chappers 71]

Originally Posted by wolly440

If you have to start worrying about MPG, you need to start thinking about a new car

It's my new pass time for motorway driving, hypermiling the 35i, 40mpg is the target
Its kinda entertaining & a lot less stressful than driving like your hairs on fire.

[Maxlude]

E90 330d manual M57 with 280hp/450ftlbs 138k miles. I can easily get 53mpg on a long run...say 300miles to Cornwall running at 75-80mph..me and the Mrs with luggage

[Tambohamilton]

Originally Posted by Maxlude

E90 330d manual M57 with 280hp/450ftlbs 138k miles. I can easily get 53mpg on a long run...say 300miles to Cornwall running at 75-80mph..me and the Mrs with luggage

And I though 48mpg was solid...damn!

[MrSweet1991]

Originally Posted by Maxlude

E90 330d manual M57 with 280hp/450ftlbs 138k miles. I can easily get 53mpg on a long run...say 300miles to Cornwall running at 75-80mph..me and the Mrs with luggage

That's really strange, do you have a pic of the average consumption? Mine no doubt is lower than others but I've never understood why as it's well looked after. But, I have on many occasions tried to see what the peak mpg is that I could get and to achieve a tad over 50mpg I had to reset while I was on the motorway and keep to something like 59mph with a very steady foot.

In fact, I actually did a 60 - 80mph acceleration video and judging by the 51mpg this must have been when I was doing that test.

https://youtu.be/4FSEGvdoSnY

[Tambohamilton]

Maxlude's is mapped, which will improve consumption so long as you're light on the loud pedal.

Mine will do about 50mpg at 50 on the motorway.

I'd suspect maybe cbu or something like that could be affecting your mpg?

[MrSweet1991]

Originally Posted by Tambohamilton

Maxlude's is mapped, which will improve consumption so long as you're light on the loud pedal.

Mine will do about 50mpg at 50 on the motorway.

I'd suspect maybe cbu or something like that could be affecting your mpg?

Mine is mapped as well, had new stats, EGR and intake manifold cleaned (EGR vacuum blocked), swirl flaps removed, Injector Nozzles cleaned, MAP cleaned, MAF cleaned and actual vs expected is pretty spot on for MAF, new turbo, clean air filter but that MPG is absolutely unachievable for me... I might disconnect MAF when I take it out later just for curiosity sakes.

Removed MAF got 39/41 doing 70mph

[Tambohamilton]

Is yours auto or manual?

I don't know what the actual comparison will be, but I'm sure swirl flap removal will not help efficiency at cruise... Not sure what effect the egr block will have too, but I can't see it helping too. Other than that, all the cleaning *should* help.

Checked your tyre pressures? In fact, what tyres do you run?

[MrSweet1991]

Originally Posted by Tambohamilton

Is yours auto or manual?

I don't know what the actual comparison will be, but I'm sure swirl flap removal will not help efficiency at cruise... Not sure what effect the egr block will have too, but I can't see it helping too. Other than that, all the cleaning *should* help.

Checked your tyre pressures? In fact, what tyres do you run?

It's an automatic which to be fair could contribute but on a long run staying in 6th gear and then resetting the MPG should in theory output roughly the same as the transmission side of things dont come into play as it sits in 6th gear at a constant speed. Swirl flaps are just a slight loss of bottom end power (well in theory but cant tell) so yeah that has no effect and should have left that out but EGR definitely does, blocking it allows the car to not only pull in constant cold air but exhaust gasses wont help with combustion either which is why the car can only open the valve when certain conditions are met. Tyres are contisport and they're inflated to what ever the sticker states i cant remember but did them 2 weeks ago lol. The car is quite frankly a mystery, my injector values in INPA are also good sitting pretty much in the middle.. ahh well I'm sure I'll figure it out one day lol.

[Andy198712]

I just got 45 I think it was, need to see the final number.
Going from Cornwall to Gatwick over night, at the speed limit with cruise in a mapped auto n57....

[MrSweet1991]

Originally Posted by Andy198712

I just got 45 I think it was, need to see the final number.
Going from Cornwall to Gatwick over night, at the speed limit with cruise in a mapped auto n57....

That's pretty good, if I'm not mistaken the cruise control would have knocked a bit off due to the way it slows itself down on hills, what speed was you doing and are you going by tank or onboard reading?

[Tambohamilton]

Originally Posted by MrSweet1991

It's an automatic which to be fair could contribute but on a long run staying in 6th gear and then resetting the MPG should in theory output roughly the same as the transmission side of things dont come into play as it sits in 6th gear at a constant speed. Swirl flaps are just a slight loss of bottom end power (well in theory but cant tell) so yeah that has no effect and should have left that out but EGR definitely does, blocking it allows the car to not only pull in constant cold air but exhaust gasses wont help with combustion either which is why the car can only open the valve when certain conditions are met. Tyres are contisport and they're inflated to what ever the sticker states i cant remember but did them 2 weeks ago lol. The car is quite frankly a mystery, my injector values in INPA are also good sitting pretty much in the middle.. ahh well I'm sure I'll figure it out one day lol.

I suspect that the torque converter will still not make 100% efficiency at a steady state cruise, so I think this will still be a bit of a loss vs a manual.

The swirl flaps are there to change the direction the air enters the combustion chamber at low RPM (I think up to 2500ish), they stay closed which directs air solely through the smaller downdraught ports towards the valve. This is more efficient than the large crossflow ports which are opened by the swirl flaps at higher RPM. The swirl flaps are there to gain efficiency as well as low end torque.

I'd like to see a back-to-back test of the EGR. I suspect that it won't actually hurt efficiency, but it's just a hunch. Again it reduces peak power, but not necessarily efficiency. Remember diesels work because air in the combustion chamber is already hot when the diesel is injected (before the combustion starts), so making it hotter can improve combustion, so long as there's enough O2 in there to fully react with the injected fuel.

Anyhow so long as you're happy, it's all good! I'm just a bit pedantic with efficiency stuff...as you may have noticed

[Maxlude]

I had it remapped about 5 yrs ago and the mpg didnt change much, it used to be around 43-45mpg.
It is deflapped also. I did notice a loss of torque below 2k rpms afterwards. New thermostats increased mpg but then i changed the intercooler redpipe and it seemed to gain a bit of low down torque back and mpg went up too. The engine felt stronger. I must have been losing some boost from the air leak and not making the most out of the remap. Also recently tried to hose out the intercooler from debris, dead bugs etc trapped within the fins.
I tend to run it exclusively on Shell diesel - with every other tank VPower.
The best mpg will also be after a DPF regen, when it goes up by 10%.
It is also a very well maintained car. I have receipts for every light bulb, wiper blade etc. from the last 11 years that I have owned it.
It currently needs a DMF/clutch and i was going to trade it in for something newer and auto, but the dealer wouldnt budge on the car i wanted and it is now sold so i've decided to keep my trusty 330d and get the DMF done. It has been a great car - not without its issues but it has kind of spoilt me with its all round capabilities.
Currently showing 49.5mpg, the trip computer is pretty accurate when comparing to manual calculation but this figure is the last 1200miles and included a horrendous 300miles and 8 hours of stop/start on the M1/M25 to/from home to Surrey a few weeks ago.

[MrSweet1991]

Originally Posted by Maxlude

I had it remapped about 5 yrs ago and the mpg didnt change much, it used to be around 43-45mpg.
It is deflapped also. I did notice a loss of torque below 2k rpms afterwards. New thermostats increased mpg but then i changed the intercooler redpipe and it seemed to gain a bit of low down torque back and mpg went up too. The engine felt stronger. I must have been losing some boost from the air leak and not making the most out of the remap. Also recently tried to hose out the intercooler from debris, dead bugs etc trapped within the fins.
I tend to run it exclusively on Shell diesel - with every other tank VPower.
The best mpg will also be after a DPF regen, when it goes up by 10%.
It is also a very well maintained car. I have receipts for every light bulb, wiper blade etc. from the last 11 years that I have owned it.
It currently needs a DMF/clutch and i was going to trade it in for something newer and auto, but the dealer wouldnt budge on the car i wanted and it is now sold so i've decided to keep my trusty 330d and get the DMF done. It has been a great car - not without its issues but it has kind of spoilt me with its all round capabilities.
Currently showing 49.5mpg, the trip computer is pretty accurate when comparing to manual calculation but this figure is the last 1200miles and included a horrendous 300miles and 8 hours of stop/start on the M1/M25 to/from home to Surrey a few weeks ago.

Wow that really is amazing! I have to say it's really surprised me as your MPG in my opinion resembles what I'd expect from an N57 engine from an LCI but your getting really good results so I think the great maintenance its had has contributed greatly. With respects to the remap it's pretty normal to have little to no impact on fuel economy unless you specifically get an economy map so yeah that's why I was really intrigued why yours does so well as ours are pretty much the same exceot transmission. I have to agree also that these cars are just phenomenal, the power and fuel economy is just so well balanced and the amount of power you can get from them (487hp is the most I'm aware of) so there's plenty of head room for upgrades if you get bored lol. But yeah thanks for replying as I was very intrigued

[MrSweet1991]

Originally Posted by Tambohamilton

I suspect that the torque converter will still not make 100% efficiency at a steady state cruise, so I think this will still be a bit of a loss vs a manual.

The swirl flaps are there to change the direction the air enters the combustion chamber at low RPM (I think up to 2500ish), they stay closed which directs air solely through the smaller downdraught ports towards the valve. This is more efficient than the large crossflow ports which are opened by the swirl flaps at higher RPM. The swirl flaps are there to gain efficiency as well as low end torque.

I'd like to see a back-to-back test of the EGR. I suspect that it won't actually hurt efficiency, but it's just a hunch. Again it reduces peak power, but not necessarily efficiency. Remember diesels work because air in the combustion chamber is already hot when the diesel is injected (before the combustion starts), so making it hotter can improve combustion, so long as there's enough O2 in there to fully react with the injected fuel.

Anyhow so long as you're happy, it's all good! I'm just a bit pedantic with efficiency stuff...as you may have noticed

That was a very interesting read!, however there are a few things I'd like to elaborate on but without hijacking the thread I'll PM you

[Maxlude]

The standard run flat tyres and suspension was pretty horrendous on these E90s though!
@MrSweet1991 - have you checked for inlet air leaks? Thinking back, changing the red intercooler pipe really made quite a difference - it had oil around it so was definately leaking. You have already changed thermostats. I had the remap before the deflap but the new redpipe brought back some lower end torque and engine is just stronger, rev faster and harder.
The only other thing I had to do to the engine was replace the EGR Pressure converter as it was thumping/quacking and exhaust temp sensors as they were preventing DPF regens.
Mine is an SE but I also think when I changed to Koni FSD and Eibach PK springs it lowered the car by about 1ins and that also helps mpg on a long cruise - but yours should already be similarly lowered as it is an MSport.