LS Swap Guide for the Mk3 Toyota Supra - Engine, Parts Needed, and More

Overview of the Mk3 Supra LS Swap

The Toyota Supra Mk3 was an iconic Japanese sports car produced from 1986 to 1992. Despite its strong turbocharged inline-6 engine, some owners choose to swap in GM's LS V8 engine for even more power. The LS engine has become a popular swap choice given its compact size, aluminum construction, and huge aftermarket support. An LS swap into the Mk3 Supra may seem daunting, but can reward you with a uniquely customized ride.

Benefits of the LS Swap

There are several key benefits to performing an LS swap on a Mk3 Supra:

• More power - The LS engines offer a broader powerband and can make substantially more power than the stock turbo inline-6.
• Better weight distribution - Mounting the lighter LS further back improves front/rear weight distribution.
• Aftermarket support - LS engines have been swapped into nearly everything, so parts availability is excellent.
• Reliability - The LS is known for being extremely reliable even at high power outputs.
• Customization - LS swaps let you put your own unique spin on the Mk3 Supra.

LS Engine Options

There are several LS engine variants to consider for your Mk3 Supra:

• LS1 - The 5.7L LS1 debuted in the C5 Corvette making 345hp. A very common choice.
• LS2 - The 6.0L LS2 was introduced on the C6 Corvette with 400hp.
• LS3 - The 6.2L LS3 brought 430hp to the table and has great torque.
• LS6 - The higher-compression LS6 makes an excellent option for boost with the right supporting mods.
• LS7 - The 7.0L LS7 is a more exotic choice needing custom fabrication, but makes big power.

Key Parts Needed

Besides the LS engine itself, here are some of the key parts you'll need:

• Engine mounts - You'll need custom mounts to correctly position the LS engine.
• Oil pan - A custom oil pan is required to provide clearance and oil capacity.
• Fuel system - Upgrades like bigger injectors and fuel pumps are critical for more power.
• Wiring harness - A custom wiring harness will integrate the LS engine controls.
• Transmission - Most choose a 6-speed manual or 4-speed automatic transmission.
• Axles - Upgraded axles are a good idea to handle the power increase.

Choosing the Right Shop

Not just any shop can properly execute an LS swap. Ideal shops have experience with:

• LS engines - They should be intimately familiar with LS components and wiring.
• Fabrication - Custom parts like engine mounts and oil pans will need fabrication.
• Tuners - Proper ECU tuning is required to optimize driveability and power.
• Mk3 Supras - Experience working specifically on Mk3 Supras is strongly preferred.

Shops with this mix of experience will give you the best end result. Trying to save money with the wrong shop often ends poorly.

Modifying Other Systems

Beyond just the engine swap, the Mk3 Supra's other systems may need upgrades as well:

Suspension

Upgraded suspension components like coilovers, swaybars, and bushings help optimize handling for the added power.

Brakes

Larger brake rotors and calipers are advised to give you the stopping power you'll need.

Wheels & Tires

Wider wheels and stickier tires put the power down and provide increased grip in corners.

Safety

A roll bar or roll cage, race seats, and harnesses help keep you safe at the power levels achieved.

Conclusion

Swapping an LS engine into a Mk3 Toyota Supra takes extensive planning and effort. But once done successfully, you'll have a unique head-turning ride with incredible power. Just be sure to select reputable shops and upgrade other systems like the brakes and suspension to fully enjoy your LS-powered Supra.

FAQs

What transmission should I use with an LS engine?

Most LS swapped Mk3 Supras use either the T56 6-speed manual or 4L60E 4-speed automatic transmission. The T56 is lighter but requires fabrication for fitment. The 4L60E is easier to install but not ideal for high power builds.

Do I need to upgrade the brakes when doing an LS swap?

Yes, upgrading the brakes is highly recommended. The extra power from an LS means you'll need larger rotors and calipers to safely stop the car. Consider an aftermarket big brake kit.

What custom fabrication is required for an LS swap?

At minimum you'll need custom engine mounts and oil pan to fit the LS in the Mk3 Supra engine bay. A custom wiring harness, fuel system upgrades, axles, and exhaust may also be needed.

How much horsepower can a stock Mk3 Supra LS1 handle?

A stock LS1 can reliably make around 500 horsepower in a Mk3 Supra before you need to upgrade the internals. With built internals, 600-800hp is achievable from an LS1.

Should I turbocharge or supercharge my LS swapped Mk3 Supra?

This depends on your goals and budget. Turbos offer great peak power while superchargers have excellent low-end torque. For big power goals, a turbo setup is usually preferred.