TURBOED-TEG

Why does the DRAG kit come with a 12:1 Vortech FMU? That is a ton of fuel pressure, how are my stock injectors suppose to handle 125psi of fuel pressure. Someone give me specifics as to why this is, is it a Honda thing or what?

BTW I already did a search but wasn't satisfied!

Thanks

PrecisionH23a

Basically, an FMU is a fuel pressure regulator. The FMU is used on fuel injected turbocharged engines using the factory electronic engine management system.
When an engine is turbocharged the air delivered to it is greatly increased. For the engine to run properly and make max power a 11.5:1 air/fuel ratio must be maintained. Since the factory electronic controller can compensate for this increased air flow (it was not designed for turbo use) another way has to be found to supply the necessary additional fuel. The FMU is the device that does this.

The FMU is installed just down stream of the stock fuel pressure regulator. It does not control fuel pressure until the engine manifold pressure comes under boost from the turbo. As the manifold pressure increases, a pressure line from the manifold to the FMU causes the FMU to increase the fuel injector rail pressure. The increased fuel pressure causes the injectors to deliver more fuel to the engine. With this system the stock factory electronic controller can be used without modification on a turbo engine with good results. It is an adequate amount of pressure for a drag kit on a basic honda motor as well as stock injectors.

therealciviczc

I've wondered the same thing. I have a 12:1 and at only 5psi, that should be an extra 60lbs of pressure on top of the factory 30 +. There is no way stock injectors can handle the 90-100 psi of pressure behind them. It works though, I just don't understand how.

TURBOED-TEG

Why does it take 11.5:1 for our cars to run correctly...I need some specifics!!