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Supra JB4 tune Install Guide

Your Supra

Pick your year to see what fits.

This page covers the US GR Supra 3.0L.

+50–100 whp (est.)
Medium$599–$5992 hrs
All Supra mods

Why do it

A plug-in tuner raises boost with adjustable maps.

Tools you'll need

Starting out? See our budget tool list.

Parts to buy

Double-check fitment before buying. We may earn a commission when you buy through these links, at no extra cost to you.

Before you start

  • Connect a battery charger if you can. A low battery during a tune can cause real problems.
  • Never turn off the car or unplug the tuner during a tune.

Steps

  1. Prepare

    • Get to the wiring.
    Watch this step (Lemon Factor, on a 2020) (4:08–6:30)

  2. Connect the engine bay

    • Connect the harness.
    Watch this step (6:30–9:32)

  3. Connect the wastegate

    • Connect the wastegate.
    Watch this step (9:32–12:06)

  4. Connect the OBD port

    • Plug in the OBD lead.
    Watch this step (12:06–12:21)

How to know it worked

Did this guide work for you?

Safety first

  • Park on flat ground, set the parking brake and chock the wheels.
  • Never get under a car held up only by a jack. Use jack stands.
  • Let the engine and exhaust cool first.
  • Disconnect the battery before unplugging electrical parts.
  • Wear safety glasses.
  • If something doesn't match your car, stop and ask a shop.

Follow your part's instructions and your service manual's torque specs.

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