If you’re diving into performance modifications for your Twin Turbo Nissan 300zx (Z32), fuel injectors are a critical component to consider, especially when thinking about upgrades or replacements. Understanding the nuances of injector types and compatibility is essential to ensure your engine runs smoothly and efficiently. Let’s break down the key aspects of injectors for your Z32.
Nissan utilized JECS side feed injectors in the Z32 300ZX, and these come in early and late styles. The early models, which are most common in Z32s, use a square plug connector. Later versions transitioned to a square oval connector, though the exact changeover date can vary between Twin Turbo (TT) and Naturally Aspirated (NA) models.
For early NA 300ZXs, you’ll typically find red square top injectors rated at 270cc. The early Twin Turbo models came equipped with purple square top injectors, delivering 370cc. It’s worth noting that these purple injectors can often change color to a chocolate brown over time due to heat and age, which is perfectly normal but something to be aware of when identifying them.
While later specification injectors maintain the same color and sizing as their early counterparts, they aren’t a direct drop-in replacement for earlier models. Installing them requires an adapter kit to accommodate the different connector style.
You might have heard about using R33 Skyline injectors, particularly the 555cc injectors from some models. While R33 injectors might physically fit, it’s crucial to understand that any change in injector size from the original specification necessitates a recalibration of your engine’s fuel management system. Simply put, swapping to larger 555cc injectors will require a tune to ensure the correct air-fuel ratio and prevent your engine from running too rich.
Speaking of tuning, remapping the factory ECU is definitely achievable. One method involves chipping and socketing your ECU and installing a pre-programmed EPROM chip. However, for optimal results and precise tuning tailored to your specific modifications, a custom map is highly recommended. For tuners, opting for a Nistune board upgrade within your stock ECU can simplify the tuning process and broaden your options for finding a tuner familiar with the Z32 platform.
In conclusion, when dealing with your twin turbo Nissan 300ZX injectors, particularly if you are considering R33 555cc upgrades, remember that proper ECU tuning is mandatory. Understanding the different types of Z32 injectors and the implications of changing injector size is key to a successful and reliable performance upgrade.
