- Known flaw on the Cooper S R53
- Upgraded Spring
- Increased Boost and Power
- A must for any mini running a Pulley reduction and Increasing Boost Pressures
- Modified and adjusted valve
So that being said....Firstly I will explain why the bypass valve on supercharged engines is so important and should be thought of as a part to check. On supercharged cars unlike turbo charged cars the extra air is always being pushed into the engine as it spins constantly via a belt rather than exhaust gases. The air that is forced around your intake system ( intercooler , manifold , supercharger ) has to go somewhere when you close the throttle as you've blocked it's route like a water damn. The system is designed so it can't escape.
So what happens when you keep filling a balloon with air - yes that's it - bang. The bypass valve on the tritec mini engine allows that air to keep going around and around when you change gear and shut the throttle rather than build up what we know as ' boost' . It does this by opening with vacuum against a spring inside it. Now when you press that accelerator pedal again I'm guessing you'd like to car to pick up its feet. Well that's where the internal spring pressure is important and so Rooster springs are designed to react quickly BUT not be overly hard that it can't open when the vacuum is low - don't worry about this as Rooster Racing already has.
Now hopefully you go on to read about the bypass valves and come back.
They aren't the easiest things to fit so give yourself time.