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Real experience
We test before we recommend.
PRODUCT DESCRIPTION
The JRspec S300SX JB is a high-quality (Japanese-made) floating bearing turbocharger, widely used in engine tuning. Its CNC-forged compressor wheel (machined wheel) allows for much more engine power with a response similar to the conventional version. Assembled in the EU with perfectly matched parts, made from the highest quality materials using precision machinery. Its 5 stages of rotor balancing, reaching 250,000 rpm, ensure trouble-free operation even in extreme conditions, with very high boosts and temperatures. JRspec turbochargers have proven their effectiveness in motorsport, being used, among others, in drag racing by Tsunami (2 R30 engines, 2 JRspec GT42R JB turbos, providing about 2300 km of power), in drift by Paweł Trela (2JZ engine, JRspec GTX3582R + BB turbo, about 900 km of power), Kornel Pruss (LS7 engine, JRspec GT45R JB turbo, over 1000 km of power) and many powerful street cars. The hybrid ceramic ball bearings significantly improve turbine response, thanks to which the engine reacts much faster to the accelerator pedal, achieving high torque at much lower speeds than in the case of turbines based on plain bearings, and even classic ball bearings, which is extremely useful in drift and on the street, where engine flexibility is of great importance. Capacity: up to 1000 HP Application: 2.5 - 4.5 l Bearings: floating bearings (made in Japan) Restrictor: choose the appropriate diameter for oil pressure (1.6mm recommended for 5B) Suction Impeller: inducer 65mm, exducer 96.3mm Exhaust Rotor: 80mm Exhaust Housing: T4 Twin Scroll Flange










WHY THETUNERLAB
We have spent years building cars, racing, and testing the exact same parts that we sell.
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We test before we recommend.
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We help you choose the right part.
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Only trusted manufacturers.
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Before and after the purchase.
+10 years
of passion for drifting
+30.000
available products
+5.000
satisfied customers
24/7
passion for motoring
Each product indicates compatible models in the product description. If you have any questions, you can contact us and we will help you choose your best option.
-If the product is in stock, the usual delivery time is 2 to 5 working days.
-If the product is out of stock, the delivery time is 7 to 15 working days.
All our products come with the manufacturer's official warranty and comply with current regulations.
Yes. We ship orders to Spain and most European countries using specialized transport agencies.
You can contact our team via WhatsApp, email, or our website's contact form.
Shipping costs depend on the type of product, its weight, dimensions, and the destination country. In most cases, the amount is calculated automatically during the checkout process before the order is finalized.
For some products, especially large items or those with special characteristics, shipping costs may require a manual review. If the amount shown does not match the actual shipping cost, we will contact you before processing the order to inform you of the final cost and request your confirmation before proceeding. We will never charge any additional fees without your authorization.