[pysical]

I am going to add port injection and was wondering if JB4 was worth having for the port injection controller safety? Or/and if it has any other safety checks built into it?

I am running MHD now, and plan to do a MHD tune with the PI but wanted to make sure I wasn't going to miss out on anything vital.

[pysical]

Bump. Trying to decide on just using the AIC for MHD, or getting JB4 and the controller. Would rather not spend more money but if it is worth it I will.

[blisstik]

I'd skip the aic just to prevent flashing another box.

If you get the jb4 and PI controller. There is no flashing the pi controller but there is flashing the jb4 for firmware updates to enable new features and safety.

And you can stack mhd and JB4. Also jb4 has a Bluetooth controller with an IOS or Android app.

[Mike@N54Tuning.com]

From the JB4 PI FAQ:

What is the difference between the SplitSecond AIC6 as a stand
alone and the JB4 PI controller?

The AIC6 is a simple stand alone system that allows mapping of port
injection as a function of boost pressure and engine speed.

The JB4 port injection controller is fully integrated solution
allowing enhanced port injection mapping and safety.

For example the JB4 port injection controller:

1) Uses low fuel pressure in conjunction with boost pressure to
evaluate injection pressure and adjust PI IPW dynamically as required
to maintain consistent flow volume. This becomes particularly
important in applications that are the edge of their low fuel pressure
supply. As low pressure drops or oscillates port injection IPW must be
dynamically adjusted to avoid run lean conditions.
2) Monitors pedal input, clutch input, gear, throttle position, etc,
allowing more advanced mapping and instant cut of PI when letting off
the gas or when traction control kicks in to avoid backfires.
3) Monitors current through the injectors and sends a signal back to
the JB4 altering it of various problems including a clogged or
disconnected injector, blown electrical fuse, loose ground, etc.
4) Monitors fuel trims in each bank and failsafes in the event of a
mismatch of more than 15% indicating a potential boost single cylinder
boost leak or injector flow issue.
5) Allows easy user adjustment of overall fuel volume using linear
"Fuel Bias 0-100" values by RPM, greatly reducing the typical mapping
complications when making manual tuning changes.
6) Integrates in to the JB4 multi-map system which produces on the fly
PI mapping changes when you change maps, when boost is reduced in
lower gears, or during anti-lag engagement.
7) When equipped with a JB4 integrated flex fuel sensor can
automatically adjust port injection volume based on E85 mixture
allowing for easy mixture changes.
8) Enhanced mapping logic such as tip in supplement to boost port
injection during sudden transitions like spool up or gear changes
where the high pressure pump tends to have problems keeping up.
9) Does not require a separate interface and cable for mapping and
tuning port injection. It's all done right through the JB4 interface
and logs greatly simplifying the process.

[hz_diesel]

Originally Posted by Mike@N54Tuning.com

From the JB4 PI FAQ:

Does anyone have examples on the on the fly map changes? I tried to look everywhere

Example would be, does it become like meth? Will map 3 be PI on or whatever map I set thru the jb4 as PI on, while every other map will be the regular 93 octane?

[Chris@VargasTurboTech]

You know, we've run all the various tuning methodologies. While we at VTT have our preferences that are specific to our needs (and personal cars), the JB4 certainly has a lot going for it flexibility/safety wise, and simply outstanding support from Terry.

Chris

[hz_diesel]

Originally Posted by Chris@VargasTurboTech

You know, we've run all the various tuning methodologies. While we at VTT have our preferences that are specific to our needs (and personal cars), the JB4 certainly has a lot going for it flexibility/safety wise, and simply outstanding support from Terry.

Chris

Personally I did not get that support from them dealing with my issues recently... only kept the unit due to the flexibility otherwise I would immediately ditch it

[limitdown]

I think you're referring to lean protection. In case there is a misfire, the DME shuts down the factory DI system and the PI continues to spray fuel.
The JB4 is not fast enough to shut down the PI.
AFAIK there is currently no solution to this problem. We deal with the risks when running PI. I run FuelIt's PI with AIC and standalone custom tune flashed using MHD. I monitor my plugs and coils very closely. I'm planning to proactively change them out every year. I also pull and check injectors every 6 months.

[Blaster400]

Originally Posted by limitdown

I think you're referring to lean protection. In case there is a misfire, the DME shuts down the factory DI system and the PI continues to spray fuel.
The JB4 is not fast enough to shut down the PI.
AFAIK there is currently no solution to this problem. We deal with the risks when running PI. I run FuelIt's PI with AIC and standalone custom tune flashed using MHD. I monitor my plugs and coils very closely. I'm planning to proactively change them out every year. I also pull and check injectors every 6 months.

This is spot on. When running PI you need to avoid misfires at all costs. I upgraded my coils to the new Precision Raceworks ones for this exact reason. I also upgraded my injectors to index 12 proactively and I change out plugs every year regardless of mileage.