Contour Enthusiasts Group Archives Forums Modifications Forced Induction ZEX Nitrous Install Questions and Pics inside.

From what I can tell, Zex will only allow the fuel pressure to rise when you have the system on otherwise it will let the regulator run normally.

The SAFC should not interfere with the zex as it is a maf scaling device and that indirectly affects the injector duty cycle instead of fuel pressure. So bottom line, an SAFC that is used to fine tune your AFRatio on the car will be operating the same way even with the zex system on or off.