Jb4 custom tuning: an honest discussion.

[DVMKV]

I am running a JB4 with BMS PI controller. Easy as could be to install. Achieving good numbers and definitely more than just the JB4 was able to accomplish. As we continue to push, the tune gets more and more complicated.

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[Gryph8n]

I presume you also have an aftermaket downpipe, charge pipe…anything else? 750cc injectors? What wHP are you getting? Who is your tuner?

 

[i3igpete]

terry burger going over the design of the pi controller. canbus with NO posi taps!

Hey guys,

I’m sure a lot of you heard about our new “CANport” controller in our latest Road to 1200 B58 youtube video series. If you haven’t, be sure to check it out!

A few little things I wanted to post along with it.

1) “CANport” was the working name under development. I’m aware there is another “CANport” named device out there unrelated so we will probably have to change the release name to PORTcan to avoid any market confusion. Final name to be determined.

2) Technically PORTcan is the second generation of the BMS integrated port injection controller that was released in 2016. We’ve made lots of great upgrades to it I’m sure everyone will love. But keep in mind the MegaSquirt system released in 2005 offered sequential port injection control and CANbus ECU communications as did the Haltech Platium Sports 1000 released in 2009. I’m not claiming we invented a new wheel here. To the contrary all this stuff has been out there for decades, despite some delusional patent claims ignoring all prior work. What sets PORTcan apart is how we’ve designed the interface, harness, and internal logic to provide tons of tuning flexibility while also being really use to use.

3) When we first added port injector control in 2016 we tested both sequential and batch fire and ultimately decided to leave the system as batch fire to simplify the harness. In retrospect, this was a mistake, not because sequential fire is really much different than batch fire for how it’s used in our applications, but because of the perception that sequential fire is vastly superior. So we’re rectifying that now. With PORTcan customers can even toggle between batch fire and sequential fire to see the differences for themselves, if they are interested. Sequential fire will be the default injection mode.

For those who love data among us, attached are two logs and dynos from our S58 M4 during PORTcan development. The only difference between these logs are batch fire vs. sequential. Runs done within minutes apart. Fuel enrichment is the total PI request and you can see its identical between them. Low fuel pressure dropped a bit more on sequential and despite that batch fire mode had higher fuel trims. Power output is the same and the rest of the tuning data more or less identical. So for those who run the original batch fire controller don’t feel like you need to upgrade for sequential. It really doesn’t matter much.

4) We’ve added a ton of unique features to the PORTcan which everyone will love. Some of that we discussed in the video like ethanol sensor input built in to the on harness, low fuel pressure sensor built in to the harness, etc. I don’t want to post everything until we’re closer to public release but as an example we’ve also added 2x direct EGT inputs. So you can run your ($50) EGT sensors right to PORTcan without the need for any adapter box and that data will go out via CANbus to the JB4 or ECU along with flex fuel and low fuel pressure.

For our 1200 B58 build we actually decided to do an EGT probe in each cylinder for a total of 6, and what Payam didn’t explain in the video is that PORTcan will read 2 of them and we got an external box to read the 4 others and feed that data in. But we believe 2x EGT will meet the needs of most people who want to run EGT sensors. And having that EGT data included will allow us to develop some nifty new integrated safety systems using that data also.

Anyway lots more to come as we get closer to release but figured we’d get some of the basic info out there!

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