JB4 Fuel Wires, what exactly are they doing?

[Mr. Tech]

Agreed - Terry seems, as far as I can tell, to work on cars the way I would want to, if I had the time, the knowledge and ability, etc..

Now if we could just persuade him to try his hand at ECU tuning

Ha, maybe if guys like me stopped asking him so many questions, he'd have time to work on it That said, it's likely just much more profitable for him to continue to expand on the JB4 platform. Plus, I've yet to see an ECU tune significantly outperform a JB4 on the Stinger.

 

[Terry@BMS]

We offer free ECU maps meant to work in conjunction with the JB4 for most platforms we support that have at home OBDII flashing. Until there are at home OBDII flashing tools for the Stinger though not worth the trouble.

 

[Mr. Tech]

We offer free ECU maps meant to work in conjunction with the JB4 for most platforms we support that have at home OBDII flashing. Until there are at home OBDII flashing tools for the Stinger though not worth the trouble.

Oh wow, that's pretty cool. How much of a difference do you usually see in performance when combining both, vs just the JB4, on your other platforms?

 

[ecko04]

It’s practically a given with Terry’s transparency that there’s no trickery at play. There aren’t too many other tuning platforms that allow you to review your own logs...even if you don’t know what you’re looking for/at.

 

[Mr. Tech]

It’s practically a given with Terry’s transparency that there’s no trickery at play.

No doubt, but transparency and trickery isn't the issue. If Terry tuned AFR open-loop using lookup tables (which some tuners do) and was straight forward with it, that's full transparency and no trickery, but I still wouldn't install the fuel wires if that's how they worked. Some of the nicest, well-intentioned tuners could still do things that aren't completely safe for the engine/user either because of a "hasn't broken yet, so it must be fine" mentality or they just haven't considered that dangers.

Look at the speed limiter, for example. Terry hasn't added a way to remove that yet because he needs to find out how it affects the stability of the car at crazy high speeds. He could just remove the limiter and let people kill themselves, but he's more concerned with safety than making a few extra bucks.

Each person has their own comfort level with what they'll do to their cars. Some people want the most power, no matter the cost. Others, like me, want a little bit more power, with minimal risk. Hence all the research and questions

 

[G-197925]

Well, just spent a couple hours researching it on the n54tech forum. Even read through every post with the words "fuel wires" in it based on a search and no one explains how it changes the AFR. Is it literally just adjusting what it sends as the charge pipe temperature through the TMAP sensor?

I suppose, at the end of the day, it doesn't really matter how it's doing this, but as an engineer, I can't help but want to know exactly what's going on. Hence why I've watched a bunch of tuning videos and spent time learning how exactly the turbos work, what the wastegates and diverter valves are doing, etc. This is my first high performance car and I want to make sure I monitor all the correct things to make sure this vehicle lasts a while, while at the same time, maximizing performance without going too crazy with mods.

Regardless, thanks for all your help so far through email, this forum, and the n54tech forum.

My best guess is the o2 sensor wire acts as a signal for the jb4 to register the actual afr reading , giving it the data it needs to shift fuel to the ideal afr by controlling injector pulse width by telling the maf more or less air. Jb4 is a trick box so it's way to complicated as opposed to a ecu flash but it works well