The Yoshida Specials 930 Turbo started its life as a 1979 930 Turbo 3.3 Coupe. It was owned and driven by the legendary Wangan driver, Yoshida Eiichi. He was the founder of the legendary Midnight Club, and worked as a doctor and later as a car dealer. Although it is unknown when he exactly purchased the car, the car was first spotted in July of 1982 with black factory paintwork with a factory Turbo livery on the rear fender.
ENGINE
The base 3.3L flat-six was an excellent platform for Yoshida to start with as it was the most powerful road engine available for the 911. The bore was enlarged to 98mm, resulting in an increase in engine capacity by 100cc. However, that was not the end; lots of race parts and one-off parts were used to upgrade the engine. Forged Mahle pistons, titanium connecting rods and camshafts from Porsche’s race department, valve springs from the 935, and a race intercooler that has triple the capacity of the stock unit are just a few of them.
A KKK K33S turbocharger replaced the stock 3LDZ unit as well. The K33S were used on Porsche’s 934 and 935 race cars, and in this car, it is capable of 1.26 bar of boost at maximum. The boost pressure can be controlled through a VVC in the center console. The panel behind the turbocharger is cut out for cooling the turbo as well. While some argue it has a turbocharger from the Honda 1.5L V6 from the MP4/4, it is not only ‘wrong’ but physically impossible due to cooling issues.
A high capacity race-use porcelain wastegate from Porsche has been added along with a single straight pipe exhaust. The exhaust manifold has a heat sensor that can be monitored from the driver’s seat. As highway races were not a sprint race but often lasted over 30 minutes, it was a smart choice to have the exhaust temperature monitored.The cylinder head is also from the Porsche 934 with twin plugs for combustion efficiency. While you can generally check the plugs from the engine bay, but you can also access the second set of plugs from the lower side of the engine. To add, the cylinder blocks are from the Porsche 934 as well.Fuel is injected by a bespoke Bosch K-Jetronic system, while a bespoke air intake built by Porsche can be seen in the back left of this picture. A dual ignition system was used, which is not common in cars. Although dual ignition allows a faster and more complete burning, which leads to more power, it remains rare in cars as it is difficult to place the second plug within the cylinder head. As a result of all these modifications, the car produced a whopping 601hp and 701Nm of torque. That is more than what the 991 Turbo S produced!
ENGINE
The base 3.3L flat-six was an excellent platform for Yoshida to start with as it was the most powerful road engine available for the 911. The bore was enlarged to 98mm, resulting in an increase in engine capacity by 100cc. However, that was not the end; lots of race parts and one-off parts were used to upgrade the engine. Forged Mahle pistons, titanium connecting rods and camshafts from Porsche’s race department, valve springs from the 935, and a race intercooler that has triple the capacity of the stock unit are just a few of them.
A KKK K33S turbocharger replaced the stock 3LDZ unit as well. The K33S were used on Porsche’s 934 and 935 race cars, and in this car, it is capable of 1.26 bar of boost at maximum. The boost pressure can be controlled through a VVC in the center console. The panel behind the turbocharger is cut out for cooling the turbo as well. While some argue it has a turbocharger from the Honda 1.5L V6 from the MP4/4, it is not only ‘wrong’ but physically impossible due to cooling issues.
A high capacity race-use porcelain wastegate from Porsche has been added along with a single straight pipe exhaust. The exhaust manifold has a heat sensor that can be monitored from the driver’s seat. As highway races were not a sprint race but often lasted over 30 minutes, it was a smart choice to have the exhaust temperature monitored.The cylinder head is also from the Porsche 934 with twin plugs for combustion efficiency. While you can generally check the plugs from the engine bay, but you can also access the second set of plugs from the lower side of the engine. To add, the cylinder blocks are from the Porsche 934 as well.Fuel is injected by a bespoke Bosch K-Jetronic system, while a bespoke air intake built by Porsche can be seen in the back left of this picture. A dual ignition system was used, which is not common in cars. Although dual ignition allows a faster and more complete burning, which leads to more power, it remains rare in cars as it is difficult to place the second plug within the cylinder head. As a result of all these modifications, the car produced a whopping 601hp and 701Nm of torque. That is more than what the 991 Turbo S produced!
