Big 2.4👈
KA24DE Turbo Build👈
A KA24DE Motor
Easier To Get To (250+HP)Turbocharged+Mods!
Cheaper/Easier To Make Power Against Rivals!
If You Dont Care For Emissions, Get Over The 300+PS Mark, With A Built Motor!
Large Displacement!
Economical!
Still Lightweight!
If Done Right, Emissioned Free For Many States!
Suitable For Lightweight Vehicles!👈
For enthusiasts looking to boost performance without breaking the bank or sacrificing reliability, a 250-horsepower turbocharged KA24DE build offers the perfect balance. The KA24DE, commonly found in the Nissan 240SX, is often overlooked due to its naturally aspirated origins and “truck motor” reputation. However, its robust 2.4-liter displacement, iron block, and ample torque make it an ideal candidate for forced induction. With careful planning, a properly tuned turbo KA can easily reach 250 crank horsepower while remaining streetable, durable, and budget-friendly.
The key to a successful build begins with starting from a healthy base engine. A compression test should be performed to ensure the motor is in good condition, with readings between 180–200 psi and minimal variance across cylinders. Oil leaks, excessive blow-by, or rod knock are red flags and should be addressed before any modifications. The stock KA24DE bottom end—featuring cast pistons and forged rods—is strong enough to handle up to 270 horsepower with a proper tune, making it more than capable of handling a 250 hp target without internal upgrades.
A simple and effective turbo setup centers around a T3/T4 hybrid or GT28-style turbocharger. A bottom-mount manifold is often preferred for ease of fitment, and a wastegate set between 7–10 psi ensures manageable and safe boost levels. Coupled with a front-mount intercooler, blow-off valve, and full 3-inch exhaust system with a high-flow catalytic converter, this setup improves airflow while remaining emissions-conscious. The goal is to enhance performance without sacrificing drivability or legality, especially for those in emissions-regulated areas.
Proper fuel and engine management are critical to the build’s longevity. Upgraded 370cc to 550cc injectors, a Walbro 255lph fuel pump, and a reliable tuning solution, such as Nistune, Megasquirt, or AEM EMS, are essential. A wideband oxygen sensor helps monitor air/fuel ratios, while a Z32 MAF sensor supports higher airflow demands. Professional dyno tuning ensures that fuel and ignition maps are optimized for boost, preventing dangerous detonation and ensuring safe operation across the powerband.
To reinforce reliability, several supporting upgrades are recommended. ARP head studs and a multi-layer steel (MLS) head gasket can help maintain a solid head seal under boost pressure, even though they’re not strictly required for a 250 hp goal. Upgraded cooling components, like a high-performance radiator and electric fans, help manage the added thermal load. A catch can or improved PCV system also protects the engine from harmful blow-by gases, which can become more prominent under boost.
In conclusion, a turbo KA24DE build targeting 250 horsepower is an excellent project for anyone seeking affordable, reliable power without a full engine swap. By combining smart turbo choices, proper fuel support, and a well-executed tune, this setup delivers strong performance with everyday dependability. When done right, it rivals or even outperforms more expensive alternatives while retaining the originality of the 240SX’s factory powertrain. With attention to detail and a focus on balance rather than extremes, a boosted KA can be the perfect blend of old-school simplicity and modern performance.
Every motor and transmission has a weakness. It is very important to address your motor and transmission for weaknesses before modifying them.
Check with your local laws and regulations before modifying, swiping motors, and transmission..👈
Important Information Before Swapping A Motor And Transmission..👈
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