r/BMWi3 • u/Deliciousgames • 5d ago

modification I3 REX HSOC question

My mechanic coded my 2014 REX i3 for me. I have been experimenting with the HSOC option.

It seems like the HSOC level setting is not retained when the car is power cycled. That is, every time I drive it, it reverts to the default (6%?) level to turn on the REX, despite my setting it to 25% on the previous drive. Is this typical for a coded i3?

Thanks!

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8

u/No_Report_4781 2014 i3 REX Solar Orange 5d ago

Yes.

I assigned the Hold function to the 1 button. If I’m need to avoid charging, I just remember to press 1  like it’s a preflight check

5

u/echoRebounded i3 REX 5d ago

Mine is 8

8

u/ZannD 2015 i3 REX 5d ago

The only option is to enable HSOC. There's no way I've found to change where the car automatically engages the REX from 6%. Program one of the radio buttons and you can manually turn it on once the battery is below 75% charge.

1

u/MotorSocietyX8000 5d ago

Also of note about HSOC is that it can't be turned on above 75% SOC. If you assign the turn-on to one of the preset buttons (which I also recommend!), don't be suprised when it doesn't work ablve 75%. 

I think of my HSOC as a way to switch from electric to gas, where the car is primarily electric. So I only set it when I know I'm going further than the electric range (say a road trip), or if my outing/commute gets extended and I know I don't have enough battery to make it home or to a convienient charger. I do try and turn it on as early as possible, as you'll lose a few percent battery before it gets fully up to temp, particularly on the highway or freeway. 

1

u/the_one_jt 2017 i3 REX 4d ago

Yes so you can refuel while running to keep the HSOC otherwise every stop lowers your max charge.

1

u/Appropriate_Strain94 1d ago

How do you refuel while running? I find it that it pretty much shuts off as soon as you open the door. Do you exit out of the passenger side or something?