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Porsche > 911 & 912 (1965-1989) > 911 1987-1989 3.2L G50 > Engine Rebuild Parts >

Direct-to-Head Throttle Bodies

Direct-to-Head Throttle Bodies

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DISPLAYING 1 to 4 (of 21 products)
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Accessories Kit for the Rennen Roller Barrel ITB Upgrade. Porsche 911
10
Accessories Kit for the Rennen Roller Barrel ITB Upgrade. Porsche 911
ITBACCESSORIESKIT
Product Information
Product Information

Accessories Kit for Roller Barrel ITB Upgrade

The Rennen by JSR Roller Barrel ITB Accessories Kit is the complete engine management and sensor package designed to support a professional Roller Barrel Individual Throttle Body (ITB) conversion. This comprehensive kit contains all of the critical sensors, brackets, vacuum components and trigger wheel hardware required to allow a modern standalone ECU to accurately monitor and control your Porsche engine.

Fits:

  • Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
  • Porsche 911 1978-1983 3.0L / SC
  • Porsche 911 1984-1986 3.2L
  • Porsche 911 1987-1989 3.2L G50

While the Roller Barrel Throttle Bodies provide the airflow and throttle response benefits of the conversion, the accessories kit provides the information the ECU needs to operate the engine correctly. Without these supporting components, the ECU cannot accurately determine engine position, throttle opening, manifold pressure or cylinder synchronisation.

This kit has been specifically developed to complement the Rennen by JSR Roller Barrel ITB system and provides a convenient, matched solution for builders seeking maximum performance, drivability and reliability.

What's Included?

The kit includes:

  • 1 x MAP Sensor
  • 1 x Throttle Position Sensor (TPS)
  • 1 x Crankshaft Position Sensor (CPS)
  • 1 x Camshaft Position Sensor (CMP)
  • 1 x Camshaft Position Sensor Mounting Bracket
  • 1 x Crankshaft Position Sensor Mounting Bracket
  • 1 x Crankshaft Position Trigger Wheel
  • 1 x Vacuum Manifold
  • 1 x Vacuum Manifold Tubing & Fittings Kit

Together these components provide the ECU with the information required to deliver precise fuel and ignition control.

What Does Each Component Do?

MAP Sensor
The Manifold Absolute Pressure (MAP) Sensor measures intake vacuum and engine load. This allows the ECU to calculate fuel delivery requirements and optimise ignition timing.

Benefits include:

  • Accurate load sensing
  • Improved fuel mapping
  • Better drivability
  • Enhanced engine efficiency

Throttle Position Sensor (TPS)
The TPS measures throttle opening angle and tells the ECU how much driver demand is being applied.

Benefits include:

  • Instant throttle response
  • Improved acceleration enrichment
  • Precise throttle mapping
  • Enhanced drivability

Crankshaft Position Sensor (CPS)
The CPS monitors crankshaft speed and position, providing the ECU with its primary engine timing reference.

Benefits include:

  • Accurate ignition timing
  • Reliable engine synchronisation
  • Stable engine operation
  • Improved performance

Camshaft Position Sensor (CMP)
The Camshaft Position Sensor identifies which cylinder is on its firing cycle, allowing sequential fuel injection and advanced ignition strategies.

Benefits include:

  • Sequential fuel injection
  • Improved cold starts
  • Enhanced engine efficiency
  • More accurate ECU control

Sensor Mounting Brackets
The dedicated sensor brackets provide precise positioning for both the crankshaft and camshaft sensors, ensuring accurate and reliable signal generation.

Benefits include:

  • Correct sensor alignment
  • Reliable signal quality
  • Professional installation
  • Long-term durability

Crankshaft Position Trigger Wheel
The trigger wheel provides the reference teeth required by the crankshaft sensor to determine engine speed and position.

Benefits include:

  • Accurate RPM monitoring
  • Reliable ECU synchronisation
  • Precision ignition control
  • Essential EFI functionality

Vacuum Manifold & Fittings Kit
The vacuum manifold combines vacuum signals from each throttle body into a stable source for the MAP sensor and other vacuum-operated systems.

Benefits include:

  • Stable vacuum signal
  • Improved ECU load calculations
  • Enhanced tuning accuracy
  • Complete installation solution

Why Are These Components Required?
Roller Barrel Throttle Bodies significantly increase airflow and throttle response, but they require modern engine management to fully exploit their potential.

The ECU relies on these sensors and supporting components to:

  • Control fuel injection
  • Calculate engine load
  • Monitor engine position
  • Control ignition timing
  • Support idle stability
  • Deliver smooth drivability
  • Maximise performance

Without these inputs, the ECU cannot operate correctly.

Why Are Roller Barrel ITB Upgrades So Popular?

Rennen by JSR Roller Barrel Throttle Bodies are one of the most advanced induction upgrades available for Porsche engines.

Benefits include:

  • Exceptional throttle response
  • Increased airflow capacity
  • Improved engine breathing
  • Greater power potential
  • Enhanced torque delivery
  • Distinctive induction sound
  • Motorsport-inspired engineering
  • Stunning engine bay presentation

When paired with the correct engine management components, they deliver a driving experience unlike any conventional intake system.


Cam Position Sensor for Rennen ITB Upgrade. Porsche 911 / 964 - 0232103114
2
Cam Position Sensor for Rennen ITB Upgrade. Porsche 911 / 964
ITBCAM911964
Product Information
Product Information

Rennen Camshaft Position Sensor for Rennen by JSR Individual Barrel Throttle Body Upgrades

The Rennen Camshaft Position Sensor (CMP Sensor) is a critical engine management component designed specifically for use with Rennen by JSR Individual Barrel Throttle Body (ITB) upgrades. Working alongside the Crankshaft Position Sensor, the camshaft sensor provides the ECU with precise information regarding camshaft position and engine cycle synchronisation, allowing modern engine management systems to control fuel injection and ignition timing with maximum accuracy.

Fits:

  • Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
  • Porsche 911 1978-1983 3.0L / SC
  • Porsche 911 1984-1986 3.2L
  • Porsche 911 1987-1989 3.2L G50

When upgrading a Porsche engine to Rennen by JSR Barrel ITBs and standalone engine management, accurate engine position data becomes essential. While the crankshaft sensor identifies engine speed and crank position, the camshaft position sensor tells the ECU exactly which cylinder is on its firing cycle. This information allows advanced ECU strategies such as sequential fuel injection and cylinder-specific ignition mapping.

For high-performance road, track and motorsport Porsche engines, the camshaft position sensor is a key component in unlocking the full potential of an Individual Throttle Body conversion.

What Does a Camshaft Position Sensor Do?

The camshaft position sensor continuously monitors the position of the camshaft and transmits this information to the ECU.

The ECU uses this data to determine:

  • Cylinder identification
  • Camshaft position
  • Engine cycle synchronisation
  • Sequential fuel injection timing
  • Ignition event timing
  • Engine start-up strategy
  • Advanced engine management functions

A properly functioning camshaft sensor helps provide:

  • Accurate fuel delivery
  • Improved ignition control
  • Faster engine starting
  • Enhanced throttle response
  • Stable idle quality
  • Improved drivability
  • Greater tuning precision

The sensor enables the ECU to know exactly where the engine is within its operating cycle.

Why Is a Camshaft Position Sensor Essential for ITB Conversions?

Rennen by JSR Barrel Throttle Body systems are designed to maximise engine performance and responsiveness. To fully exploit these benefits, modern programmable engine management systems require highly accurate engine position information.

The camshaft position sensor allows:

  • Sequential fuel injection operation
  • Cylinder-specific ignition timing
  • Improved cold-start performance
  • Enhanced fuel economy
  • Smoother idle characteristics
  • More precise tuning control
  • Improved emissions control where applicable

Without a camshaft position sensor, many ECUs are forced to operate in less sophisticated batch-fire fuel injection modes, reducing the overall refinement and efficiency of the engine.

Why Are Barrel ITB Upgrades So Popular?

Rennen by JSR Barrel Throttle Bodies are engineered to deliver exceptional airflow and a truly engaging driving experience.

Benefits include:

  • Instant throttle response
  • Increased airflow capacity
  • Improved engine breathing
  • Enhanced power and torque potential
  • Motorsport-inspired induction sound
  • Greater tuning flexibility
  • Improved driver engagement
  • Stunning engine bay appearance

When combined with accurate crankshaft and camshaft position monitoring, the system delivers professional-level engine management performance.

Why Choose the Rennen Camshaft Position Sensor?

Developed specifically for Rennen by JSR ITB applications, this sensor provides the accuracy and reliability required for advanced ECU calibration.

Benefits include:

  • Accurate camshaft position measurement
  • Supports sequential fuel injection
  • Enables advanced ECU functionality
  • Improves engine synchronisation
  • Enhances drivability
  • Supports high-performance tuning
  • Suitable for road and motorsport applications
  • Reliable long-term operation       

Classic Mesh Air Filter Set for Rennen ITB Upgrade. Porsche 911 / 964
2
Classic Mesh Air Filter Set for Rennen ITB Upgrade. Porsche 911 / 964
ITBCMF911964
Product Information
Product Information

Rennen ITG Classic Mesh Air Filter Set for Rennen by JSR Individual Barrel Throttle Body Upgrades

The Rennen ITG Classic Mesh Air Filter Set is a bespoke six-piece filtration package designed specifically for Rennen by JSR Individual Barrel Throttle Body systems. Each filter is engineered to fit directly onto the Rennen velocity stacks, combining classic motorsport styling with practical engine protection.

Fits:

  • Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
  • Porsche 911 1978-1983 3.0L / SC
  • Porsche 911 1984-1986 3.2L
  • Porsche 911 1987-1989 3.2L G50
  • Porsche 964 (911) C2 1989-93
  • Porsche 964 (911) C4 1989-93
  • Porsche 964 (911) RS 3.6L 1991-93
  • Porsche 964 (911) RS 3.8L 1991-93

These filters use a mesh and foam construction to help protect the engine from dust, debris and airborne contaminants while allowing the ITB system to retain its free-flowing induction characteristics. The result is a period-inspired appearance with the essential filtration needed for road, fast-road and performance use.

Designed to complement the visual appeal of exposed velocity stacks, this filter set is ideal for Porsche owners who want the classic race-engine look while still helping protect valuable internal engine components.

What Do Classic Mesh Air Filters Do?

The air filters sit directly over the velocity stacks and filter incoming air before it enters the throttle bodies and combustion chambers.

They help provide:

  • Protection from dust and debris
  • Reduced risk of engine contamination
  • Improved engine longevity
  • Cleaner intake airflow
  • Protection for cylinders, rings and valves
  • Classic motorsport-inspired appearance
  • Practical filtration for ITB conversions

Without suitable filtration, exposed velocity stacks can allow harmful particles to enter the engine.

Why Are Air Filters Needed with Barrel Throttle Bodies?

Rennen by JSR Barrel Throttle Bodies are designed for maximum airflow and instant throttle response. However, the open intake design means air is drawn directly into each throttle body.

Adding the correct filter set helps:

  • Protect expensive engine internals
  • Reduce premature engine wear
  • Maintain reliable performance
  • Support consistent tuning
  • Preserve the benefits of velocity stacks
  • Improve long-term durability
  • Make the conversion more practical for road use

For any road-driven ITB-equipped Porsche, air filtration should be considered an essential part of the upgrade.

Why Choose the Rennen ITG Classic Mesh Filter Set?

This filter set is developed to fit Rennen velocity stacks correctly, offering a clean installation and authentic performance appearance.

Benefits include:

  • Bespoke fit for Rennen velocity stacks
  • Set of 6 individual filters
  • Mesh and foam construction
  • Classic exposed-stack styling
  • Practical filtration protection
  • Lightweight and compact design
  • Ideal for Porsche ITB conversions
  • Suitable for performance road and motorsport-style builds

Why Are Barrel ITB Upgrades So Popular?

Rennen by JSR Individual Barrel Throttle Bodies are one of the most desirable upgrades for naturally aspirated Porsche engines.

Benefits include:

  • Instant throttle response
  • Improved airflow efficiency
  • Enhanced engine breathing
  • Stronger performance potential
  • Distinctive induction sound
  • Greater tuning flexibility
  • Motorsport-inspired engine bay appearance
  • More engaging driving experience

The Classic Mesh Air Filter Set allows owners to enjoy the look and sound of velocity stacks while adding important engine protection.

Crank Position Sensor for Rennen ITB Upgrade. Porsche 911 / 964
1
Crank Position Sensor for Rennen ITB Upgrade. Porsche 911 / 964
ITBCS911964
Product Information
Product Information

Rennen Crankshaft Position Sensor (CPS) for Rennen by JSR Individual Barrel Throttle Body Upgrades

The Rennen Crankshaft Position Sensor (CPS) is one of the most important components within a modern engine management system and an essential part of any Rennen by JSR Individual Barrel Throttle Body (ITB) conversion. The sensor continuously monitors crankshaft position and engine speed, providing the ECU with the precise information required to control ignition timing, fuel injection events and overall engine operation.

Fits:

  • Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
  • Porsche 911 1978-1983 3.0L / SC
  • Porsche 911 1984-1986 3.2L
  • Porsche 911 1987-1989 3.2L G50

When upgrading a Porsche engine to Individual Barrel Throttle Bodies and standalone engine management, accurate engine position data becomes critical. The ECU relies on the Crankshaft Position Sensor as its primary reference point for engine synchronisation. Without a reliable crankshaft signal, the ECU cannot accurately determine engine speed or crankshaft position, making precise ignition and fuel control impossible.

Whether you're building a fast road Porsche, a high-performance air-cooled engine or a dedicated motorsport application, the CPS provides the foundation for accurate ECU calibration and maximum engine performance.

What Does a Crankshaft Position Sensor Do?

The Crankshaft Position Sensor monitors the exact rotational position and speed of the engine crankshaft.

The sensor transmits this information directly to the ECU, allowing it to determine:

  • Engine speed (RPM)
  • Crankshaft position
  • Ignition timing events
  • Fuel injection timing
  • Engine synchronisation
  • Rev limiting functions
  • Starting and idle control strategies

A properly functioning CPS helps provide:

  • Accurate ignition timing
  • Precise fuel delivery
  • Reliable engine starting
  • Smooth idle operation
  • Stable engine performance
  • Improved drivability
  • Consistent ECU operation

The crankshaft sensor effectively serves as the heartbeat of the engine management system.

Why Is a CPS Essential for ITB Conversions?

Rennen by JSR Barrel Throttle Body conversions are typically paired with modern programmable engine management systems to unlock their full performance potential.

For the ECU to operate correctly, it must know the precise position of the crankshaft at all times. The CPS provides this information continuously and with extreme accuracy.

This allows:

  • Sequential fuel injection control
  • Accurate ignition timing maps
  • Stable idle quality
  • Improved throttle response
  • Faster ECU processing
  • Enhanced tuning accuracy
  • Reliable high-RPM operation

Without a crankshaft position signal, the ECU simply cannot determine when to fire injectors or ignition coils.

Why Are Barrel ITB Upgrades So Popular?

Rennen by JSR Barrel Throttle Bodies are engineered to maximise airflow while delivering an authentic motorsport driving experience.

Benefits include:

  • Instant throttle response
  • Increased airflow efficiency
  • Improved engine breathing
  • Enhanced power and torque potential
  • Exceptional induction sound Increased driver engagement
  • Modern EFI compatibility
  • Stunning engine bay appearance

When combined with accurate crankshaft position monitoring, standalone engine management and professional calibration, the result is a highly responsive and exceptionally capable Porsche engine.

Why Choose the Rennen CPS?

Developed specifically for Rennen by JSR ITB applications, the sensor delivers the accuracy and reliability required for professional engine management installations.

Benefits include:

  • Precise crankshaft position measurement
  • Accurate engine speed monitoring
  • Supports standalone ECU systems
  • Essential for EFI conversions
  • Improves ignition timing accuracy
  • Supports sequential fuel injection
  • Suitable for road and motorsport applications
  • Reliable long-term performance       

DISPLAYING 1 to 4 (of 21 products)
1 2 3 4 >>
About Direct-to-Head Throttle Bodies

Direct-to-Head Throttle Bodies – Ultimate Airflow, Precision Response & Motorsport-Level Performance

Direct-to-head throttle bodies (ITBs) are one of the most effective performance upgrades available for naturally aspirated and high-revving Porsche engines. By mounting the throttle body directly to the cylinder head—eliminating long intake runners and restrictive manifolds—these systems deliver exceptional throttle response, increased airflow, and improved cylinder-to-cylinder distribution. The result is sharper power delivery, improved mid-range torque, enhanced high-RPM breathing and motorsport-grade drivability.

Ideal for performance rebuilds, custom tuning projects, classic Porsche upgrades, or engines converted to standalone engine management, direct-to-head throttle bodies offer the crisp response and induction noise that enthusiasts and engine builders seek.

What Direct-to-Head Throttle Bodies Do

Direct-to-head throttle body systems deliver a range of performance advantages:

  • Improve throttle response by reducing intake tract volume
  • Increase airflow velocity for better cylinder filling
  • Enhance high-RPM performance with individual, unrestricted throttle passages
  • Support precise air-fuel tuning for standalone ECU systems
  • Provide equal air distribution to all cylinders
  • Allow fine adjustment of idle and synchronization for optimal smoothness
  • Enable aggressive camshaft profiles thanks to freer airflow
  • Deliver iconic ITB induction sound for enthusiast-grade driving engagement

These systems transform the engine’s character, making it more responsive, tunable and performance-oriented.

Why Throttle Bodies Fail Over Time

Throttle bodies in both stock and performance engines are exposed to constant movement, fuel vapour, heat and air contaminants. Common reasons for failure include:

  • Worn throttle shafts causing air leaks or inconsistent idle
  • Carbon buildup affecting plate movement or airflow
  • Cracked housings due to heat cycling or age
  • Vacuum leaks at mounting points or seals
  • Damaged linkage systems leading to uneven throttle opening
  • Bearing wear in performance or high-mileage applications
  • Electronic actuator failures in electronically-controlled units

Symptoms include rough idle, hesitation, uneven cylinder behaviour, poor throttle response or tuning difficulty.

Why You Should Replace or Upgrade to Direct-to-Head Throttle Bodies

Upgrading to precision-machined, performance-engineered direct-to-head throttle bodies provides immediate improvements in responsiveness, tuning capability and engine performance.

Key benefits:

  • Sharper and more immediate throttle response
  • Increased horsepower and torque through improved breathing
  • Smoother airflow and better cylinder balancing
  • More efficient combustion and improved drivability
  • Greater compatibility with performance cams and standalone
  • ECUs Enhanced durability with motorsport-grade materials
  • Reduced intake restriction and improved volumetric efficiency
  • Future-proofing for tuned or rebuilt Porsche engines

These systems are ideal for anyone seeking motorsport behaviour on the road or track.

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