Cartech Rising Rate Fuel Pressure Regulator is available now for $270. The page below is copy of Cartech website.
Purpose of the Rising Rate Regulator
The Cartech regulators are designed specifically to add fuel to modified EFI engines (turbos, superchargers and normally aspirated). This is accomplished by using the manifold vac/pressure to drive the fuel pressure up as the boost rises, or with the N/A engines, as the vacuum goes toward atmospheric. If we already build the best FPRís (often called FMUís), whatís the sanity of making another? The answer is to keep the copiers way behind. Our original FMU, introduced in 1975, has been copied six times and is still used by four companies. The 2020 series regulator is the fourth generation design to come from Cartech, and every new design has been better than the previous. Imagine how vastly better these new designs are than that 25 year old relic the other guys are still producing!
The broad range of tuning capability by changing fuel pressure has yet to be fully explored. We have pioneered this concept with the introduction of the rising rate fuel pressure regulator. It has been created for the purpose of increasing the fuel flow through electronic fuel injection systems when conditions of engine load demand more fuel. Unique to the rising rate regulator is that the pressure only increases when needed then returns to stock. This concept does not keep the fuel pressure up all the time. The concept of the rising rate regulator is particularly useful in three circumstances:
1. The factory turbo/supercharger car when the stock boost
pressure is increased.
2. An aftermarket turbo/supercharger system applied to an EFI equipped car.
3. A normally aspirated EFI car with modifications that increase the air flow.
These regulators are unique with the adjustability of rate of gain as well as onset of gain. The potential for increasing fuel flows is very large, with as much as 40% more fuel available. This solution is particularly attractive as it is less expensive and tunable. The regulator installs in the EFI return line after the stock regulator and overrides the stock regulator at full throttle or when under boost. One truly unique feature of our design is the ability to begin raising the fuel pressure before getting under boost. This ability will tune out the inherent turbo/supercharger lean flat spot at the onset of boost.
(Bracket and fittings included)
Here is the installation instruction from Cartech FMU Installation