2017 infiniti Q50 AWD
3.9s on a JB4 is pretty impressive regardless of drivetrain.Back when I was JB4, I was able to cut 3.9s RWD.
An AWD car should be able to cut better, probably like a 3.7 on the street. It'll take some practice with footbraking off the line, but it's doable.
Here's the JB4 custom map 6 I had back then - this is full send and only recommended if you know you've got good 93, are watching temps and timing etc, and make if you've got a full turbo back exhasut setup.
RPM 1500-7000, interval 500 +3 +3.5 +4 +5 +8 +8 +7 +7 +7 +5 +3 +0
This is on a RS400, for a SS/Luxe add 5psi to all of those.
So you had traction issues holding you back?
I've seen plenty of RWD JB4s who deadhook no issues, but also aren't running 3.9s.