This isn’t actually the first time I’ve messed around with the JDMny’s boost settings post-N1. Before the new ECU had even landed in the UK I’d purchased and installed a GReddy Profec OLED electronic boost controller which was a beautiful bit of kit but ultimately a bit overkill for my needs.
The same could also be said of the almost-period HKS EVC III I fitted instead – in both cases they felt like they were designed for getting big turbos spooled up quickly and I couldn’t get the smooth delivery I wanted on the JDMny. (Conversely, the EVC-III-derived boost rush was great fun in the Capp!)
I settled on leaving the N1’s boost potential untapped – I’d still benefit from the more aggressive fuelling and timing – but seeing the GFB Atomic’s linear delivery and rock-steady performance on the All-the-Rs made me eager to try it out on the JDMny. The install (engine orientation aside!) was identical to that of the Wagon’s and after a few test runs I settled for full boost at 16.5-17psi (~1.15bar), up 4psi from the stock 13psi (~0.9bar).
The difference is certainly noticeable at full throttle – there’s now a greater ability to power through rather than change down a gear – but also (like the Wagon) at smaller throttle openings too, where I guess the OEM solenoid held some boost back to help with smoothness and fuel economy. It’s taken a while for my right foot to adjust to this but overall I’d say the Atomic is a nice, linear, middle ground between the softness of the OEM setup and the punch of boost from the more aggressive GReddy and HKS controllers.