Preformance V8 engines and Throttle Body Injection

Throttle Body Injection and Turbo

V8 throttle body Conversion

Throttlle Body Injection can be used on most V8 engines, Chevy, Ford and Chrysler, 235 to 360 CID. A small block engine with a mild street cam and TBI provides easy starting, great drivalibility, and better fuel economy than the same carburated engine.

To upgrade form a carburator involves installing the following

• Remove the carburator and install the adapter plate and the throttle body
• 4 sensors
• EFI wiring harness, ignition and vss modules.
• ECU with EPROM tuned to the enginesize and cam
• EFI fuel pump and fuel system plumbing

Throttle body injection also works mounted vertically, or at an angle. Dual Throttle bodys can also be used on a V8 engine if an aux. injector driver is used. this allows fuel injection of very large engines without using Expensive "Big Bore" TBI or complicated multiport systems.

Turbo and TBI




Any engine adapted to TBI can also be turbocharged by using a TBI intake cover. The system works best if intercooled. Tuning a Turbo ECU is an involved process and requires good instrumentation , so it's best to use an EPROM that is already available for the exact turbo setup.

The turbo cover is cast alumnium and covers the entire top of the TBI including the fuel pressure regulator. This insures that the fuel pressure rises with the turbo boost.

A 2 bar map sensor is used with a scaler module to provide the ECU with a signal that varies from 0 to 5 volts over -14.7 to 7 psi (gauge) This way the engine can run closed loop under low boost situations.

The exhaust head pipe requires a flex joint or a flex pipe to help keep engine movement from over stressing the turbo. A ball in socket spring joint such as front wheel drive vehicles use works well.

This is also a good way to destroy the engine if care is not taken to avoid detonation. It's best to use low boost,conservative redlines, and pleanty of fuel under boost. Higher boost can be used with internal engine modifications, more instrumentation, and additional fuel delivery, and water injection, but is much more prone to engine desturction, and should be used only by wealthy racers.