EFI-DIY, so I have questions about the VVT. I have been reading that it is controlled by oil pressure and a solenoid, is the solenoid computer controlled? I have a BMW with VVT but it is all mechanical off of oil pressure. I am looking to use the 4200 and want to keep the VVT, just wondering if it is feasible out of the factory GM car, and does it need to be fairly stock to keep the VVT?
