Ecu remapping - big decrease fuel

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Ecu remapping - big decrease fuel

Postby QiQi » Thu Oct 25, 2018 6:22 pm

Hello,

i have a little problem after i did a stage 1 ecu remap
my mpg has decreased significantly
when driving in town i can see the km range drop every 5 - 10 seconds by 1 km
example whan i start up the car i have 250km left on fuel and after mayby 5km of driving it dropped to 210,while driving very normal
when driving on the highway and using cruise control it comsumes fuel normally (or even better?)
does anyone knows what the problem is?
its a bmw 520d - year 2010- manual - 163hp version

i have asked the tuner to just push the engine to it's limits without dangering the car components
i did not ask him anything about fuel efficiency
could it be that he remapped the engine so i have non stop torque at the low rpm's (like 0 - 2000 rpm)
if so, would lowering the torque from 0 - 2000 rpm will get me a better fuel efficiency?
i have added a picture, these are the results of the remap
thank you in advance

QiQi
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Re: Ecu remapping - big decrease fuel

Postby Shooting » Thu Oct 25, 2018 6:38 pm

QiQi wrote:Hello,

i have a little problem after i did a stage 1 ecu remap
my mpg has decreased significantly
when driving in town i can see the km range drop every 5 - 10 seconds by 1 km
example whan i start up the car i have 250km left on fuel and after mayby 5km of driving it dropped to 210,while driving very normal
when driving on the highway and using cruise control it comsumes fuel normally (or even better?)
does anyone knows what the problem is?
its a bmw 520d - year 2010- manual - 163hp version

i have asked the tuner to just push the engine to it's limits without dangering the car components
i did not ask him anything about fuel efficiency
could it be that he remapped the engine so i have non stop torque at the low rpm's (like 0 - 2000 rpm)
if so, would lowering the torque from 0 - 2000 rpm will get me a better fuel efficiency?
i have added a picture, these are the results of the remap
thank you in advance


Try posting in "INTRODUCE YOURSELF" before asking for help.....

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Re: Ecu remapping - big decrease fuel

Postby QiQi » Thu Oct 25, 2018 6:57 pm

im sorry will do

edit: picture
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QiQi
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Re: Ecu remapping - big decrease fuel

Postby jurebv » Thu Oct 25, 2018 9:46 pm

Without file we cannot help you...but sounds like decalibrated duration

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Re: Ecu remapping - big decrease fuel

Postby QiQi » Thu Oct 25, 2018 9:59 pm

Hi,
thanks for the response but what is decalibrated duration?
and i do understand without the file it's harder to explain but i don't have it because it was never in the discussion
the car drives normally when on the highway at a constant speed using cruise control

but when i drive in town where i have to shift allot, breaking and accelerating i see my kilometer range drop very very fast
i gained allot of torque at lower rpm's after the remap
and when driving in town i use allot of low rpm's
could this be the cause?
or did the ecu remap messed up my fuel sensors mayby?

QiQi
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Joined: Thu Oct 25, 2018 5:57 pm
Location: Belgium


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