I've been helping a lot of customers lately who have decided to flash but are bumping up against the limitations of a one size fits all off the shelf flash map. The JB4 with its high speed logging is not only the perfect logging tool for those who have decided to flash but also lets you make tuning adjustments on the fly including boost by gear, altering the air/fuel ratio, or changing the boost target. Not to mention WMI/CPI control, safety systems, ethanol sensor support, and much more.
The examples below are very interesting in that the only changes made were to the boost offsets. Note the tuning approach taken with the JB4 will vary based on the flash map itself. Some maps respond well to MAP offsets alone while others need WGDC changes, o2 biasing, or a combination of all three.
And the nice thing about using the JB4 to make these minor changes dynamically is you're not locked in to them. Over boosting to 24psi during a track day on racing fuel might not be such a bad thing. With the JB4 in the loop you're not locked in to anything. Your flash map has perfect boost control on your car? Then maybe you use the JB4 to add 1psi up top or to lean out the air/fuel ratio a bit when running ethanol, or maybe you subtract 2psi in 1st gear to nail the perfect 60' as the track conditions deteriorate throughout the day. You've got a lot of options and all your run data is recorded via bluetooth to the JB4 app for easy viewing in the pits.
The first is a lap 2.5 car with full bolt ons, hitting around 24psi on the flash. In this case we used the JB4 valet map (map8) to reduce around 3psi of boost target, which brought boost down to a safer ~20psi level and also reduced timing corrections. Since these logs we've refined map6 in v28 firmware to allow more precise control over the boost reduction.
The next log is a Lap v1.5 flash with mods running E30. It's hitting around 21psi, which would be OK, but the flash is clearly not setup for E30, as fuel pressure is starting to crash, and fuel trims are maxed out. We used the new map6 adjustment to simply reduce boost 2psi across the board. That simple change got fuel trims are down and fuel pressure is up. I'm hoping we see his timing corrections learn down after a few more pulls.
Finally another Lap v1.5 flash running 93 + WMI. Boost was creeping up to around 23psi flash only increasing timing corrections. Again using the new map6 we dialed back boost around 2psi across the board which brought boost down to safer levels and reduced timing corrections.
The examples below are very interesting in that the only changes made were to the boost offsets. Note the tuning approach taken with the JB4 will vary based on the flash map itself. Some maps respond well to MAP offsets alone while others need WGDC changes, o2 biasing, or a combination of all three.
And the nice thing about using the JB4 to make these minor changes dynamically is you're not locked in to them. Over boosting to 24psi during a track day on racing fuel might not be such a bad thing. With the JB4 in the loop you're not locked in to anything. Your flash map has perfect boost control on your car? Then maybe you use the JB4 to add 1psi up top or to lean out the air/fuel ratio a bit when running ethanol, or maybe you subtract 2psi in 1st gear to nail the perfect 60' as the track conditions deteriorate throughout the day. You've got a lot of options and all your run data is recorded via bluetooth to the JB4 app for easy viewing in the pits.
The first is a lap 2.5 car with full bolt ons, hitting around 24psi on the flash. In this case we used the JB4 valet map (map8) to reduce around 3psi of boost target, which brought boost down to a safer ~20psi level and also reduced timing corrections. Since these logs we've refined map6 in v28 firmware to allow more precise control over the boost reduction.
The next log is a Lap v1.5 flash with mods running E30. It's hitting around 21psi, which would be OK, but the flash is clearly not setup for E30, as fuel pressure is starting to crash, and fuel trims are maxed out. We used the new map6 adjustment to simply reduce boost 2psi across the board. That simple change got fuel trims are down and fuel pressure is up. I'm hoping we see his timing corrections learn down after a few more pulls.
Finally another Lap v1.5 flash running 93 + WMI. Boost was creeping up to around 23psi flash only increasing timing corrections. Again using the new map6 we dialed back boost around 2psi across the board which brought boost down to safer levels and reduced timing corrections.
