[PSA] JB4 Users, What Is Your WOT AFR?

[user2688]

Just to be clear, my car has DCI, CP with BOV and DPs. I am not throwing any codes apart from the catless DP codes.

For all of you who run JB4 on your cars and haven't gone into the details of fine tuning it or playing around with it, make sure you check what your AFRs look like.
I was running at about 14.5 on WOT which is BAD! The car hesitated a lot when pulling and the power came in bursts, not linear at all.
The fuel gauge hijack was almost straight in the middle which is consistent with the 14.5 I was getting from the JB4 app connected with the USB cable.

I had to increase the AFR bias values by 40% to get a consistent 12.5 AFR. The fuel gauge hijack should be at 1/4 tank.
Is it just me and it was a one off case? I was running default AFR bias values...

[Ginger_Extract]

When I last checked, car was pretty much high-12s across the board. Good PSA though, will check on the drive home from work tonight.

[ShocknAwe]

On the off chance, are you running old firmware?

[user2688]

Originally Posted by ShocknAwe

On the off chance, are you running old firmware?

Nope, I got the JB4 in late 2013 and had it on my previous 135i but I don't remember checking my AFR's. I did the firmware update less than a month ago when I noticed the AFR's where out of whack and they didn't improve until I played with the AFR bias.

[amsnow440]

Have you posted this in the support section of n54tech? BMS is very quick to help with any issues.

[ShocknAwe]

Originally Posted by user2688

Nope, I got the JB4 in late 2013 and had it on my previous 135i but I don't remember checking my AFR's. I did the firmware update less than a month ago when I noticed the AFR's where out of whack and they didn't improve until I played with the AFR bias.

What are they set to now with the v31?

[Solo_M_Tech]

12.5-12.8/1 on pump gas and 13.1/1 on E85.

[user2688]

Originally Posted by ShocknAwe

What are they set to now with the v31?

RPM AFR BIAS
2500 35
3000 42
3500 42
4000 42
4500 42
5000 39
5500 32
6000 28
6500 25

Have you posted this in the support section of n54tech? BMS is very quick to help with any issues.

Nope, haven't even thought of it. Should I see this as an issue with the JB4? I thought it was simply a question of user adjustment


Here is a log of a run I did maybe a few weeks ago where you can see the AFR.

[amsnow440]

Originally Posted by user2688

RPM AFR BIAS
2500 35
3000 42
3500 42
4000 42
4500 42
5000 39
5500 32
6000 28
6500 25

Nope, haven't even thought of it. Should I see this as an issue with the JB4? I thought it was simply a question of user adjustment


Here is a log of a run I did maybe a few weeks ago where you can see the AFR.

That's where their support shines. Terry and his staff will get you all fixed up

[ShocknAwe]

Take a log and post it up for them, they'll get you fixed right up.