The 300ZX

Engine Differences

The question often comes up "I've got a non turbo, what is involved in converting it into a turbo?". Generally, because of the number of differences between the two, the best way to convert your non turbo is first to sell it, then use the money and a little extra, to buy a turbo. A number of conversions have been done, but usually there are special reasons for doing so, for example, in building a race car, where you are making extensive changes anyway, and are combining a number of components from a number of sources.

Feature Turbo Non Turbo
Radiator Hi capacity Low capacity
Intercooler two Not applicable
Instruments Boost gauge None
Oil cooler Oil cooler None
Auto transmission RE403A (Stronger) RE401A
Auto shift schedules different to non turbo  
Auto stall revolutions different to non turbo  
Manual gearbox Same as non turbo  
Differential ratio 3.692 (R230V) 4.083 (R200V)
Drive shaft larger Smaller
Coil spring constant 146lbs/in 123lbs/in
Rear stabiliser Harder Softer
Wiring loom For turbo control  
Engine computer For turbo control  
Body Inter cooler grills none
Compression ratio 8.5:1 10.5:1
Cast aluminium pistons moly coated skirts not coated
Cast aluminium pistons Built in oil channels not built in
exhaust valves Iconel not Iconel
Cooling to turbos Oil & water not applicable
clutch Vacuum assisted no assistance
Connvertable Not available available