It’s been almost 4 years since we imported a Ford Escort RS Cosworth to the USA. As one of the most Iconic Rally Cars of the 90s, some of the technology in these cars just isn’t up to par to help deliver the power we want. While we have done other mods including a full custom exhaust, upgraded fuel system, tuning, and other bits (Video Coming Soon), one thing we needed to change was how the boost was controlled. the Ford Escort RS Cosworth uses something called an Amal Valve. Replace the M with an N and that is about as well as it performs. But for 1993, it did its job.
The reason we decided to change out the boost controller is because of the erratic boost behavior we kept seeing. Even after upgrading the wastegate, fuel components, and a new eeprom chip to bring the car to 400 horsepower, the boost pressure would drop off nearly 10 psi from the Amal Valve. After reading everywhere on the online forums of the early 2000s, this thing just didn’t get the job done and was prone to failure. Having used Greddy in past projects like our Porsche 997 Turbo with GT3076 turbos, we were confident that the Greddy EBC was the perfect solution to get the boost pressure under control on the Cossie.
The Greddy EBC is designed to work with both external and internal wastegates. The internal wastegate like the Cossie has is the typical OEM turbo type configuration. You have a line that goes to the wastegate and a line that goes to the compressor housing. In between is the Boost Controller Solenoid which is controlled from the display inside the cabin. Setting the boost controller is not as simple as one might think at first. You cannot just set the boost to say 25psi. You have to set the Gain and HI/Low settings. This is a percent value of how the boost controller takes over from the wastegate keeping it closed until the set limit is reached. Typically you can start at a very low number and slightly increase the % value until you hit the desired boost level you want. You also have a limiter setting so if you were to spike over that boost level, the Greddy will pull back boost immediately to prevent any damage.
Newer turbo cars have sophisticated ECUs that can control the boost levels to exactly as you need including safety features. However the early 2000s and older cars are perfect candidates for running an electronic boost controller. Giving you the ability to set your high and low boost levels keeps you in control of the power you want to achieve.
Order a Greddy Boost Controller Here
