![]() ![]() As low pressure drops or oscillates port injection IPW must beĭynamically adjusted to avoid run lean conditions.Ģ) Monitors pedal input, clutch input, gear, throttle position, etc,Īllowing more advanced mapping and instant cut of PI when letting off Important in applications that are the edge of their low fuel pressure The JB4 port injection controller is fully integrated solutionĪllowing enhanced port injection mapping and safety.įor example the JB4 port injection controller:ġ) Uses low fuel pressure in conjunction with boost pressure toĮvaluate injection pressure and adjust PI IPW dynamically as required ![]() Injection as a function of boost pressure and engine speed. The AIC6 is a simple stand alone system that allows mapping of port What is the difference between the SplitSecond AIC6 as a stand alone I don't mean to take away from that, but the project itself has ballooned into something way more than what is really should be. The efforts made by BMS are noble, and lots of hard work goes into making JB4 work. The hardware itself is failure prone and so is Terry's programming. Your question should read "Is there any advantage to ditching JB4 as a port injection controller and using something else?" I personally would say yes because people have had tons of problems with the JB4 firmware. If you already have a custom "BEF," there won't be any "gains" by eliminating the JB4 device from your setup. You use JB4 to control your port injection which is the only reason why a "custom" flash tune for your car would be referred to as a "back-end-flash." BMS just made up some stupid acronym so the masses wouldn't realize that the JB4 piggy back device has limitations to what it can "tune" once you start getting more aggressive with it. Therefore, a "custom" tune written specifically for your car and mods is generally "smoother." Even a generic tune (or "BEF") will be massively smoother than a JB4 only setup. ![]() The problem is, neither of these options are "custom." They are simply generic tunes that are meant to work on all cars. Wedge Tuning wrote the N54 off-the-shelf tunes that are sold through the MHD app and BMS wrote the off-the-shelf tunes (BACK END FLASHES) that are written specifically for use with JB4 and are free for use on N54tech. Wow I can't believe how messed up this community is because of BMSs' made up words.Ī "BEF" is a flash tune and there is no such thing as a "flash tune made by MHD." MHD is just an app used to load a file onto the cars computer. Am considering going with flash as I have read that it has smoother power delivery. My current setup uses JB4 and MHD, with a custom BEF made by MHD. Each have their selling points, and their drawbacks. I'm not sure if there are flash only limitations in the N55 world that would drive you to the JB4 instead.ĮTA: I've had 3 N54's and have used COBB, Procede, JB4 and MHD and done combo's with BEF's and Piggy backs. So while the JB4's safety systems are always one of its top selling points this particular safety hasn't been coded and released yet. Terry has said he could update the firmware to detect the misfire code via CAN and have it trigger the PI to stop, but as of yet that feature doesn't exist. With all that said which is better, flash only or JB4? It's effectively a tossup. Most people don't try and "power through" misfires so bad the DME is cutting fuel, but if you did this is the situation you'd find yourself in. You'll be in an extremely lean environment during that pre-ignition and will experience extremely high in cylinder temps and pressures that could melt or crack a ringland.which could also bend a rod due to the pressure spike. Now what happens if you get pre-ignition (i.e. What you have in this instance is a situation where more than 1/2 the expected fuel in this problematic cylinder has just been removed, yielding a dangerously lean environment. It (the PI system) has no clue a misfire occurred and the DI injector is disabled. The problem with PI is that it is being triggered by boost and RPM. The fuel cut is accomplished via disabling the DI injector. When the DME senses a misfire it cuts fuel to that cylinder. But be warned, before reading this.the flash capabilities between the N54 and N55 aren't the same and I am not familiar with the N55 flash limitations.įrom an N54 perspective the real issue with PI is safety. First off you asked in the N54 section, so you're going to get an N54 response. The question you are asking is more complex than you might think.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |