nickp
Posts: 62
Joined: Tue Oct 02, 2018 7:40 am

Need hand holding on 2015 Rex Fuel Tank capacity

Wed Oct 10, 2018 9:42 am

I have programmed using the Bimmercode app to increase the fuel tank capacity but I cannot still fill beyond 1.9 gallons (US). Can anyone shed some light on this? I haven't tried the expert mode as I am afraid I will simply screw it all up :?

PBNB
Posts: 120
Joined: Sat Jul 21, 2018 11:28 am
Location: Vancouver, BC

Re: Need hand holding on 2015 Rex Fuel Tank capacity

Wed Oct 10, 2018 5:45 pm

nickp wrote:I have programmed using the Bimmercode app to increase the fuel tank capacity but I cannot still fill beyond 1.9 gallons (US). Can anyone shed some light on this? I haven't tried the expert mode as I am afraid I will simply screw it all up :?
I just bimmercoded mine and showed that I had a quarter tank left. I went to fill it up with non-ethanol fuel and put 7.75 litres in. Seems to be working on mine. I didn't go into the expert mode as I too am afraid of messing it up. Ours came from California and I still need to take it to the a local BMW dealer to see if I can get an extended warranty. I wont want to venture into the expert mode until that is sorted out.
2015 i3 REX

nickp
Posts: 62
Joined: Tue Oct 02, 2018 7:40 am

Re: Need hand holding on 2015 Rex Fuel Tank capacity

Wed Mar 20, 2019 1:03 pm

PBNB wrote:
nickp wrote:I have programmed using the Bimmercode app to increase the fuel tank capacity but I cannot still fill beyond 1.9 gallons (US). Can anyone shed some light on this? I haven't tried the expert mode as I am afraid I will simply screw it all up :?
I just bimmercoded mine and showed that I had a quarter tank left. I went to fill it up with non-ethanol fuel and put 7.75 litres in. Seems to be working on mine. I didn't go into the expert mode as I too am afraid of messing it up. Ours came from California and I still need to take it to the a local BMW dealer to see if I can get an extended warranty. I wont want to venture into the expert mode until that is sorted out.
Thanks!

nickp
Posts: 62
Joined: Tue Oct 02, 2018 7:40 am

Re: Need hand holding on 2015 Rex Fuel Tank capacity

Wed Mar 20, 2019 1:04 pm

I am still not able to go beyond 1.7 to 1.9 gallons on the fuel tank capacity. Is there someone that can help me with expert mode commands?
Thanks! :oops:

bwilson4web
Posts: 702
Joined: Fri Apr 29, 2016 11:59 pm
Location: Huntsville, AL

Re: Need hand holding on 2015 Rex Fuel Tank capacity

Thu Mar 21, 2019 11:09 am

This is all I know: viewtopic.php?f=13&t=4611#p39817

Bob Wilson
20k/27k mi 2014 BMW i3-REx
10k/10k mi 2017 Prius Prime

nickp
Posts: 62
Joined: Tue Oct 02, 2018 7:40 am

Re: Need hand holding on 2015 Rex Fuel Tank capacity

Thu Mar 21, 2019 1:56 pm

bwilson4web wrote:This is all I know: viewtopic.php?f=13&t=4611#p39817

Bob Wilson
Thanks Bob. Yesterday I found some info on increasing the capacity to 9 lit but I had to enter a custom value 0X12. Haven't filled gas yet but hoping it does the trick.

jadnashuanh
Posts: 4483
Joined: Thu May 22, 2014 2:07 pm
Location: Nashua, NH USA

Re: Need hand holding on 2015 Rex Fuel Tank capacity

Thu Mar 21, 2019 4:02 pm

FWIW, changing that value doesn't do anything physically...it tells the computer that it can use more of the fuel that's already in the tank. The computer will shut the REx off when the sensor says empty...not because it really is. Changing the programming tells the computer it can use more and rescales the gas gauge. In reality, even with the reprogramming, the car doesn't actually empty the tank. The in-tank fuel pump doesn't really like that, so there will still be some fuel left inside.
Jim DeBruycker
2011 535i x-drive GT, 2014 i3 BEV

nickp
Posts: 62
Joined: Tue Oct 02, 2018 7:40 am

Re: Need hand holding on 2015 Rex Fuel Tank capacity

Fri Mar 22, 2019 9:28 am

jadnashuanh wrote:FWIW, changing that value doesn't do anything physically...it tells the computer that it can use more of the fuel that's already in the tank. The computer will shut the REx off when the sensor says empty...not because it really is. Changing the programming tells the computer it can use more and rescales the gas gauge. In reality, even with the reprogramming, the car doesn't actually empty the tank. The in-tank fuel pump doesn't really like that, so there will still be some fuel left inside.
Yeah. Valid points. But I am not even able to fill the 2.4 gallons others get after coding.
Something I am doing is not right.

bwilson4web
Posts: 702
Joined: Fri Apr 29, 2016 11:59 pm
Location: Huntsville, AL

Re: Need hand holding on 2015 Rex Fuel Tank capacity

Fri Mar 22, 2019 11:57 pm

Where are you located?

Can you make a video posted to YouTube showing what you're doing?

Bob Wilson
20k/27k mi 2014 BMW i3-REx
10k/10k mi 2017 Prius Prime

nickp
Posts: 62
Joined: Tue Oct 02, 2018 7:40 am

Re: Need hand holding on 2015 Rex Fuel Tank capacity

Mon Mar 25, 2019 8:59 am

bwilson4web wrote:Where are you located?

Can you make a video posted to YouTube showing what you're doing?

Bob Wilson
Hi Bob, I am in Los Angeles. I think I can upload a video when I get some time.
I even manually added the NHex Value 0X12 but no dice.

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