{"product_id":"roller-barrel-itb-upgrade-kit-3-bolt-inlet-manifold-porsche-964-3-8ltr-4-0ltr","title":"Roller Barrel ITB Upgrade Kit 3 Bolt Inlet Manifold. Porsche 964 3.8ltr \/ 4.0ltr","description":"\u003cp\u003e\u003cb\u003eRennen ITBs for Air-Cooled Porsche 964 - \u003c\/b\u003e\u003cb\u003eAdvanced Roller Barrel Individual Throttle Bodies \u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eThe Rennen ITBs by JSR represent the next generation of individual throttle body technology for air-cooled Porsche 964 engines. Designed and engineered specifically to extract optimal performance from classic Porsche flat-six engines, these innovative roller barrel throttle bodies deliver exceptional airflow, sharper throttle response, and improved engine efficiency compared to conventional butterfly valve throttle body systems.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eFits:\u003c\/b\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003ePorsche 964 (911) C2 1989-93\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePorsche 964 (911) C4 1989-93\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePorsche 964 (911) RS 3.6L 1991-93\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePorsche 964 (911) RS 3.8L 1991-93\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eDeveloped through extensive research, flow simulation analysis and real-world testing, the Rennen ITB system provides a premium induction solution for performance-focused Porsche enthusiasts, restorers, track-day drivers and motorsport applications.\u003c\/p\u003e\n\u003cp\u003eWhether you are building a high-performance Porsche 911 engine or converting a classic air-cooled Porsche to modern EFI, Rennen ITBs by JSR offer a significant advancement in intake technology.\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cb\u003eWhy Choose Rennen Roller Barrel ITBs?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eUnlike traditional individual throttle bodies that utilise a butterfly valve positioned directly in the airflow path, the Rennen ITB system features a precision-engineered tapered roller barrel design.\u003c\/p\u003e\n\u003cp\u003eThis innovative approach provides several key advantages:\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eUnrestricted Airflow\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eThe roller barrel design eliminates the butterfly valve obstruction found in conventional throttle bodies. With no throttle plate disrupting airflow, air moves more efficiently into the engine, improving volumetric efficiency and overall performance.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eIncreased Air Velocity\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eBecause there is no butterfly valve occupying space within the throttle bore, the throttle body diameter can be optimised to maintain higher air velocity. Higher intake air speed promotes superior cylinder filling and enhanced engine response throughout the rev range.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eSuperior Fuel Atomisation\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eAt partial throttle openings, airflow passes directly over the fuel injector. This promotes exceptional atomisation of the air-fuel mixture, improving combustion efficiency, drivability and throttle progression.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInstant Throttle Response\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eThe short distance between the roller barrel and the inlet valve creates a highly responsive induction system, delivering immediate engine response and a direct connection between driver input and engine output.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eThe ITB kit comes with the ITBs mounted on intake manifolds and with fuel rails made for the EV6 injector type. \u003cbr\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cb\u003e\u003c\/b\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cb\u003eAdvanced Flow Simulation \u0026amp; Development\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eExtensive computational fluid dynamics (CFD) analysis and development testing have been carried out to optimise every aspect of the Rennen ITB design.\u003c\/p\u003e\n\u003cp\u003eFlow simulation data demonstrates:\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eDirect airflow over the fuel injector during part-throttle operation.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSignificantly reduced turbulence around the injector area compared to traditional butterfly throttle bodies.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eUp to 20% less airflow restriction at full throttle when compared with conventional ITB systems.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eImproved airflow consistency across all cylinders for enhanced engine balance and performance.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe result is a highly efficient induction system capable of supporting both fast road and high-performance motorsport applications.\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cb\u003ePremium Motorsport-Grade Construction\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eEvery Rennen ITB by JSR system is manufactured to the highest standards using precision CNC machining and premium materials.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePrecision CNC Machined\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eAll components are machined from high-grade 6082-T6 aluminium to ensure exceptional dimensional accuracy and durability.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePerfect Airflow Distribution\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eTight manufacturing tolerances ensure evenly distributed airflow across all throttle bodies, promoting balanced cylinder performance and simplified engine tuning.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eEasy Synchronisation\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eThe robust design incorporates minimal joints and connections, allowing straightforward throttle synchronisation and reducing the need for ongoing adjustment.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eLong-Term Reliability\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eThrottle barrels are mounted within sealed ball bearings for smooth operation, durability and long service life under demanding conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePremium Sealing Technology\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eAll sealing surfaces utilise Viton O-rings to prevent false air entry and maintain optimal engine performance.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQuality Components Throughout\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eOnly premium bearings, rod ends and stainless-steel fasteners are used throughout the assembly, ensuring reliability and durability in both road and track environments.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eHard Anodised Finish - Available in Gun Metal or Black Finish\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eAll aluminium components receive a hard anodised gunmetal grey finish, providing corrosion resistance and an attractive motorsport inspired appearance.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSpecification\u003c\/b\u003e\u003cbr\u003eFuel Rails machined for EV6 injector type\u003cbr\u003e3 bolt inlet manifold to cylinder head mounting\u003cbr\u003e50mm velocity stack ID\u003cbr\u003e120mm velocity stack length\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cb\u003eThe Ultimate Porsche Individual Throttle Body Upgrade\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eFor enthusiasts seeking the ultimate air-cooled Porsche induction system, Rennen ITBs by JSR combine cutting-edge engineering, advanced airflow technology and premium construction quality. The innovative roller barrel design delivers exceptional throttle response, improved airflow efficiency, enhanced fuel atomisation and proven performance gains.\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUpgrade your Porsche 911 with one of the most advanced individual throttle body systems available and experience a new level of engine responsiveness, drivability and performance\u003c\/span\u003e\u003c\/p\u003e","brand":"Rennen Plus","offers":[{"title":"Default Title","offer_id":53624934760727,"sku":null,"price":0.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0975\/6226\/3831\/files\/JSR122121.webp?v=1783319696","url":"https:\/\/rennenplus.com.au\/products\/roller-barrel-itb-upgrade-kit-3-bolt-inlet-manifold-porsche-964-3-8ltr-4-0ltr","provider":"Rennen Plus","version":"1.0","type":"link"}