Transitioning from Z32 Airflow&CP to Airflow-less Configuration
In the late 1970s, the shift from carburetors to electronic fuel injection represented a major evolution in the automotive industry. While Japanese cars quickly adopted electronic systems, European models like the Porsche 911 continued utilizing mechanical injection, specifically the Bosch K/KE Jetronic. This changed with the 911 Type 964 which embraced electronic control for naturally aspirated versions, yet the turbo models held on to the older technology for a while longer due to its reliability.
Comparing these systems from three decades ago to today’s advancements, the KE Jetronic feels outdated. It lacks the refined control modern systems provide and could potentially develop problems over time. Enter Pentroof, renowned for optimizing maximum speed tunes. They took on the challenge of replacing these outdated systems to maximize the hidden potential and reliability of vehicles like the Porsche 964 Turbo.
Pentroof utilized Nissan parts extensively. The ignition system received a major upgrade with a customized distributor housing a RB26DETT crank angle sensor and an RB20E power transistor. This setup can efficiently control up to six cylinders. Furthermore, the fueling system incorporates a Third-party 600cc injector, and a Bosch pump to ensure fuel sufficiency in high-output ranges.
Additionally, the F-CON V PRO system enables D-Jetronic control. An Infinity 90φ throttle is integrated, enhancing both power delivery and reliability. The AAC valve, originally from Z32, is another vital part enhancing idling stability when paired with the V PRO configuration.
Worth mentioning is the overhaul of the 3.3L SOHC air-cooled flat-six engine, which involved full balancing to optimize its performance further. The turbine system remains stock, yet a combination involving an HKS racing wastegate and EVC controls ensures a boost pressure setting of up to 1.2 bar.
Pentroof also addressed the car’s framework including a switch to custom-made stainless-steel dual exhausts. The chassis benefits from bespoke Pentroof SPL coilovers, while the braking system employs oversized 964 Turbo 3.6 calipers and rotors for enhanced braking efficacy.
The 964 Turbo’s appearance receives a touch of flair with a front spoiler from TBK incorporating fog lamps and original Speedline wheels. Completing the makeover are Potenza S-03 Pole Position tires sized at 225/40 in the front and 265/35 in the rear, catering to improved road grip and performance.
By modernizing control systems and incorporating Nissan parts, Pentroof projects Porsche’s legacy into the future. They didn’t just enhance speed; they improved everyday usability and robustness. This transformation underscores the immense benefits contemporary electronic control systems bring to automotive performance and reliability.
