Flash tuners typically enrich the low end AFR target and disable lean spool mode, providing a fixed AFR target across the power band. I've always been convinced they do it to make their logs prettier and not for any tuning reasons, as both provide drawbacks (more fuel demand causing fuel pressure crashes, potentially slower spool up, etc), but as many know trying to reason with some of these flash tuners is like pissing in the wind.
With a JB4 flash fuel wires are only needed if you want to change the air/fuel ratios set in the flash. On other applications where this is more popular people tend to lean out the flash air/fuel ratio in the midrange to allow more boost without crashing fuel pressure.
With a JB4 flash fuel wires are only needed if you want to change the air/fuel ratios set in the flash. On other applications where this is more popular people tend to lean out the flash air/fuel ratio in the midrange to allow more boost without crashing fuel pressure.