Can anybody help me, i am looking at a 300ZX with a series of HKS mods, there are two small boxes in the glove box with various buttons etc can anybody identify what these may be, all the dealer can tell me that it has been modified to aprox 400bhp with s/s exhaust system inductor kit, blow of valves but still running on stnd wheels & brake combo any advise and imput much apreciated.

 

Tim.

 

I've seen this before on imports, it could be a VPC (Vein Pressure Convertor) and / or a PFC (Power Fuel Computer)

 

Basically the VPC allows you to change from a Mass Air Flow sensor to a pressure sensor in the manifold (I think). Usually done on race cars, not common on road cars as you get poor low end driveability.

 

The Power Fuel Computer I think interfaces with the stock ECU and does some funky things like raise the rev limiter, change fuelling..

 

Pretty old stuff these days. If it works don't worry about it, if the car drives a bit rough or is detonating then hiff the lot and put a Stage 3 chip in the stock ECU. Keeps things nice n simple and they work!

 

Rowan Hick

Sonic-Motorsport.com

Auckland, New Zealand

 

Thanks for the reply, i forgot to mention the car is a genuine UK model and the two boxes in question are labeled VPC & EVC units.

 

Tim

 

Tim,

 

The EVC (Electronic Valve Controller) controls the turbos actuators to vary the boost level.

 

This has probably been set to 1bar boost pressure.

 

Be careful not to adjust it beyond the engine capabilities (1bar by the sound of things) or it could prove expensive.

 

Steve