[warioware]

I have a 2011 335is with a JB4 and DCI. I took it to the track a couple of days ago and the car kept going into limp mode around 80mph. I was running around 1/4 tank of e85 on map 5 and i was wondering if there was a setting which i needed to adjust? Thanks!

[SfValley335i]

Originally Posted by warioware

I have a 2011 335is with a JB4 and DCI. I took it to the track a couple of days ago and the car kept going into limp mode around 80mph. I was running around 1/4 tank of e85 on map 5 and i was wondering if there was a setting which i needed to adjust? Thanks!

First try to produce a log, not sure why you were running 1/4 tank of just e85, unless that was a typo?

My car didnt like 45% e85 mix, once I got the mix down to 30-35% car seems more happy. You might/probably have to adjust your open loop value in the Jb4 settings.

Follow this, its from the Jb4 forum

3) Revised open loop mapping and introduced open loop auto learning system. This will automatically range open loop fueling as a function of fuel trims and other internal parameters. *** NOTE *** In some cars the auto learning may not properly range open loop fueling, triggering false 29F2 fuel pressure codes, and you will need to set it manually. To do this first disable open loop learning by setting FutureUseA = 2. Then start with an open loop setting of 75. If you experience 29F2 codes lower the setting by 5 until they subside. If your fuel trims are stuck over 50, you experience run lean failsafe (2 SES flashes), or encounter frequent 2D25 tuner codes, increase the setting by 5 until they subside. If your high fuel pressure is consistently below 13 when open loop is 75% or higher you likely have a physical fuel pump problem. If you are unable to find a suitable setting to avoid both 29F2 and 2D25 codes you will need to reduce the alcohol content of your fuel (e.g. if mixing in E85 mix in less), lower the all map AFR settings to lean the air/fuel targets, or use a fixed boost map like 1 or 2.
4) Various minor changes related to the above items.

[warioware]

Originally Posted by SfValley335i

First try to produce a log, not sure why you were running 1/4 tank of just e85, unless that was a typo?

My car didnt like 45% e85 mix, once I got the mix down to 30-35% car seems more happy. You might/probably have to adjust your open loop value in the Jb4 settings.

Follow this, its from the Jb4 forum

sorry i meant 25% e85 mix and how do you adjust the open loop value?

[SfValley335i]

Originally Posted by warioware

sorry i meant 25% e85 mix and how do you adjust the open loop value?

Connect your laptop to the JB4... Then get to this screen....



then follow the instructions below...

3) Revised open loop mapping and introduced open loop auto learning system. This will automatically range open loop fueling as a function of fuel trims and other internal parameters. *** NOTE *** In some cars the auto learning may not properly range open loop fueling, triggering false 29F2 fuel pressure codes, and you will need to set it manually. To do this first disable open loop learning by setting FutureUseA = 2. Then start with an open loop setting of 75. If you experience 29F2 codes lower the setting by 5 until they subside. If your fuel trims are stuck over 50, you experience run lean failsafe (2 SES flashes), or encounter frequent 2D25 tuner codes, increase the setting by 5 until they subside. If your high fuel pressure is consistently below 13 when open loop is 75% or higher you likely have a physical fuel pump problem. If you are unable to find a suitable setting to avoid both 29F2 and 2D25 codes you will need to reduce the alcohol content of your fuel (e.g. if mixing in E85 mix in less), lower the all map AFR settings to lean the air/fuel targets, or use a fixed boost map like 1 or 2.
4) Various minor changes related to the above items.

[warioware]

Originally Posted by SfValley335i

Connect your laptop to the JB4... Then get to this screen....



then follow the instructions below...

thanks! i'll try that as soon as i get a chance