[FancyTie]

So I went from 9l/100km to 15l/100km on map Stage 1 91 from BM3. Doesn't make any sense imo...

Is that normal??

Burble settings on MAX. Someone from ProTuningFreaks told me burble wasn't changing fuel consuption which i'm clearly skeptical of lol. I flashed it back to OTS burble and will check back tomorrow.

I hope it's only the burble setting that affects my fuel consuption like that which would make sense as it burns extra fuel in exhaust to make it bang/pop.

320hp -> 390hp and +6l/100km more is not worth at all IMO.

[exE36M3]

I agree!... to make "burbles + pops" the car has to run rich so larger fuel droplets are left over in the exhaust phase. These fuel molecules are then ignited in the catalytic convertor.

[FancyTie]

Yup! I guess my fuel consumption will be better with minimum setting for burble. 6l/100m increase is way to much for me only for this sound! I’ll go straight pipe instead ahah

That’s still not correct from them to say it doesn’t change anything on your comsuption just to make you buy it.

[chowser51]

My mpg hasn’t changed since flashing.

Maybe your driving style changed? You like the increase in power so you’re lead footing it more?


Let us know what you find.

[FancyTie]

I'll change burbles setting tonight and check back. This morning I was averaging 9l.. That's my bad I guess as I ran the car in my town after the tune. Running in 2nd gear for 5km isn't the best so that's why I was sitting around 15l I guess. Was at like 20l+ going uphill this morning too lol. Will check back tomorrow after adding burbles back. Everything seems okay for now! I was kind of scared.. +6l/100km is a huge amount in 1 year ahaha

[mike@x-ph.com]

Burbles will decrease MPG. If you turn burbles off the MPG will be the same as stock as long as you are not pushing the car more aggressively

[FancyTie]

That's what I thought! Here's what PTF said when I asked them before buying BM3 : "Burble effect makes no difference on fuel consumption."

[14F30Daily]

So I have also recently flashed, been a couple months at this point, and I have seen an increase in mpg. I have obviously been pushing it a lot more than pre flash and since then it has been reading 1-2 mpg higher than before. I have also verified this against physical reading on the pump, there has been an increase.

If you are looking at about 10.5 mpg drop there you have to be WOT a good amount. Are you pushing it most of the time?

[Jeff@TopGearSolutions]

Gas mielage can vary quite a bit depending on many things. They say Driving mileage can vary 35% just by mood.

Unless the conditions are exact your foot may have just been in it more. Tunes use more fuel cause more boost is more air which requires more fuel - just the nature of the beast!.

Burbles tunes will use more fuel on average too but it's small to some people and negligible to others. I used to AVG 22 MPG. Now it's closer to 13 MPG cause my trips are a bit less frequent and more enthusiastic we'll say.

[Randy Johnson]

You lost me at liters!!!

[Blahx9]

Let’s just say I only got 193 miles out of my last full tank... stage 2 though.

[thejeremyman9]

Originally Posted by Blahx9

Let’s just say I only got 193 miles out of my last full tank... stage 2 though.

These cars get substantially worse fuel economy in city than highway, and city is even more impacted by driving habits. The tune itself does not inherently decrease fuel economy.

Also, if you are running ethanol, you necessarily get reduced fuel economy due to the lower energy density of the fuel.

[Blahx9]

Originally Posted by thejeremyman9

These cars get substantially worse fuel economy in city than highway, and city is even more impacted by driving habits. The tune itself does not inherently decrease fuel economy.

Also, if you are running ethanol, you necessarily get reduced fuel economy due to the lower energy density of the fuel.

It’s the nature of the tune to provide more fuel then when stock. More boost requires more fuel. Also as others mentioned , tuned you are most likely to get on it more, which amplifies the burning.

[FancyTie]

I've been running the same as before right now. I drove in city some days and that's why it was decreasing so much!

1-2-3 gear is like 20-25l/100km which is insane lol but goes lower on highway like 6-7l/100km. Make more sense to me now. Running at 10l/100km on average, same as when I bought it!

Still wondering how can the mpg stays the same with higher numbers on the car.. Does stage 2 change anything on fuel consuption or it stays normal?

[thejeremyman9]

Originally Posted by Blahx9

It’s the nature of the tune to provide more fuel then when stock. More boost requires more fuel. Also as others mentioned , tuned you are most likely to get on it more, which amplifies the burning.

The tune does not provide more fuel when you are driving at or below stock boost/power levels. Therefore, there is no direct impact on fuel economy when you are driving on the highway or any other condition that does not push the car beyond what the stock tune would do. Of course when you drive the car at WOT or any other condition that exceeds stock power it will necessarily use more fuel. Again, like i said, its mostly the change in driving habits.

Originally Posted by FancyTie

I've been running the same as before right now. I drove in city some days and that's why it was decreasing so much!

1-2-3 gear is like 20-25l/100km which is insane lol but goes lower on highway like 6-7l/100km. Make more sense to me now. Running at 10l/100km on average, same as when I bought it!

Still wondering how can the mpg stays the same with higher numbers on the car.. Does stage 2 change anything on fuel consuption or it stays normal?

Exactly. Its the combination of a greater fraction of your driving coming from city and greater throttle input from a change in driving habits.

Like i said above, the tune is not changing AFRs under cruise or anything that would affect fuel economy when you are just commuting in the same way you would before being tuned. You should be able to get the same fuel economy as stock tune assuming your adjust your driving habits accordingly. For example, you may need less pedal input than stock to achieve the same acceleration, and so on.