Rennen Motorsport, Adelaide
Rennen ITBs by JSR is an individual throttle body system developed by JSR Engineering and offered through Rennen Motorsport. It is designed specifically for air-cooled Porsche engines, with a focus on airflow efficiency, drivability and repeatable real-world performance rather than theoretical peak numbers.
The system targets air-cooled Porsche engines where usability, consistency and performance must work together, suiting fast road cars as well as competition-focused builds that demand precise throttle control.
Developed by JSR Engineering
The ITB system is JSR Engineering's work, developed in the UK and offered here through Rennen Motorsport. Rennen is JSR's Australian principal, and the same appointment covers their suspension geometry, alignment and handling optimisation for Porsche.
Built for air-cooled engines
The system is designed specifically for air-cooled Porsche engines, where throttle response and drivability matter more than a headline peak figure. Fitment and specification are worked out on a consult, because these builds are rarely identical.