Log Review - short shifting w/ map2.

[GTS Jeff]

Hello all, my 2019 C43 wagon with a JB4 and BCM is faster, but it seems to be shifting from 1-2 at 4000rpm and 2-3 at 5000rpm on map2. Not sure what gives with that! As a result my stock tune [email protected] shifting well compared to map2 shifting badly runs [email protected] on map2. problems seem worse when brake boosting aggressively even though the launch itself is badass. TC is off.

I’ve also uploaded a datalog which is map2, then map0, then map3. Not sure if the ignition advance dropping in map 2 when full boost hits is ok. And is throttle closure ok?

Also, I’m using firmware 23…not sure if that is correct for the 2019 models.

I would really appreciate comments from Terry and the team please! Thank you! I want to get this wagon into the low 12s! Maybe 11s on E30!!!

[GTS Jeff]

So car just stalled on a busy highway today… and then wouldn’t start for a good 10 minutes. managed to make it home on limp mode though.

not sure what to make of this n

[Terry @ BMS]

On fault codes read them via the JB4 app.

In the logs you can see fuel pressure crashing. What is the fuel?

[GTS Jeff]

Ahhh next time I’ll use jb4 to view codes!

I am using petrocanada 94 octane…it’s got “up to 10% ethanol” but otherwise a pretty standard fuel. Is this a common issue terry? Does it explain the short shifting as well as the car stalling out? Thanks!

[GTS Jeff]

What is the correct firmware to flash in for 2019 modes with BCM? I don’t see the same name options in the app. Not 2020?