Our newest generation plug and play ECU and harness kit is now available for the 84-89 Nissan 300zx Platform. The MS3Pro Mini features a fully weather proof AMP sealed connector, relay and fuse box, fed through a main power line protected by a 100A MEGA Fuse. Each harness is labeled at each connection, and tested on our in-house test engine for quality control verification before getting packed and shipped out to your door.

We originally wanted to develop a MS2 plug and play kit for the Z31, but we ran into a few fitment issues, that the MS3Pro Mini solved. Additionally, for it’s price point, it’s a really hard product to beat for the money. Not only is it POWERFUL, you get all of the benefits of a MS3x setup, at MS2 level pricing. This ECU is also HALF the size of the MS2/MS3 Case, and you get to ditch the DB style connector. This means it will fit under your factory trim.

The final added benefit is much faster lead times. One of the main contributing factors to our lead time is modifying the ECUs. This requires a properly trained technician to solder components and jumpers to the mainboard, which will no longer be required, saving an entire day in production time.

This kit comes as a fully plug and play option for the 1984-1989 300zx platform.

PURCHASING NOTES:

• Flex fuel can be added on by purchasing separately

• Our Complete Fuel Rail and Injector Upgrade Kits can be purchased separately

• Low Impedance Injectors are Typically 1.0-4.0 ohms [Requires $100 Resistor Box. Box is a bit bulky and can be mounted in a few different locations based off of accessories found in engine bay.

• High Impedance Injectors are Typically 10.0-14.0 ohms

• We will support both the OEM coolant temperature sensor, as well as offer a relocated wet-well sensor for the intake manifold based off of your choosing. The relocation sensor requires disabling the OEM injector cooling fan. We recommend using this location for your coolant temp sensor, but if you are adamant on keeping your OEM injector cooling fan, you will have to keep the OEM sensor. This option can be selected in the drop down menu.

• NEW PRODUCT NOTICE: Since this is a new product, there may be some minor adjustments or accommodations that need to be made across different year models, and differences in accessories, such as cruise control, turbo versus non-turbo, etc. | We are more than happy to alleviate any concerns and work around any issues that arise, but we ask that you please communicate any issues with us first so that we can take whatever necessary corrective actions to remedy any fitment or compatibility issues.

This kit includes the following

• MS3Pro Mini ECU

• Fully Terminated and labeled Plug and Play Harness

• Tuning Cable w/ USB Adapter

• Registration code for Tunerstudio License [Free Autotune and Datalogging]

• Weatherproof Fuse and Relay Box

• 54mm Upgraded Trigger Wheel

• Igniter Box

• 240sx Throttle Position Sensor

• GM Coolant Temperature Sensor

• GM Intake Temperature Sensor

• All mounting hardware

• Base Tune [See notes on base tune below]

This kit MAY include the following based off of options selected

• Ballast Resistor Box [For use with OEM or other low impedance fuel injectors]

• Ballast Resistor Bypass Pigtail [For use with high impedance fuel injectors]

• OEM Tachometer Adapter [For use with the factory Tachometer]

• Launch Control

• Boost Control

• Flex Fuel

Build time is 6-8 weeks from the time the order is placed

We also offer street tuning locally in the Dallas/Fort Worth area for an additional $725 per vehicle.

Base Tune Notes:

We have only tuned a couple of Z31 platforms in house as of 04.18.25, and as more come in for tuning, we will continue to improve the base tunes we supply. The base tune supplied as of right now will be very rudimentary.

This part does not conform to C.A.R.B. or E.P.A. Emissions Standards and is intended for off-road/race use only.