Cars keep getting more complicated, but that’s not always a bad thing. Some of the new tech genuinely makes them safer and easier to drive, especially when the road starts bending. One feature that does this well is Active Cornering Enhancement, or ACE. It keeps the car flat and steady when you throw it into a corner, so you don’t get that tipping-over feeling. It uses sensors and hydraulics to cut down on body roll, which makes winding roads less nerve-wracking and gives you more confidence.
Whether you’re dodging through city traffic or cruising on the motorway, ACE is always adjusting to keep the ride smooth and predictable. Below, we’ll walk through how the system works, what can go wrong, and why it actually makes driving better without sacrificing safety.
What Is Active Cornering Enhancement?
ACE is basically a smart suspension setup that stops the car from leaning too much in corners. You know that sideways lurch you feel when you turn in a bit too quickly? That’s body roll and ACE is there to fight it.
The system tweaks the suspension constantly to keep the car as flat as possible. That means better grip, less of that wobbly lean, more stability and a more comfortable ride. It really helps on bigger vehicles like SUVs, which tend to roll more because they sit higher up. ACE keeps them planted even when the road gets twisty.
How Land Rover Uses It
The Land Rover Discovery 2 was one of the first vehicles to get ACE, and it was paired up with the air suspension system. That combo gave the Discovery 2 decent comfort on the road and proper capability off it. Here’s what makes up the system:
- ACE Fluid: Needs good quality hydraulic oil (part numbers STC50519 or LR003401). You’ve got to keep it checked and changed regularly.
- ACE Pump: Sits at the heart of the system, pressurising the hydraulic fluid so the whole thing can react quickly in corners.
- ACE Unit: Made up of a valve block and actuator, which directs fluid to each corner of the suspension.
- Pressure Transducer: An important sensor. If it fails, the yellow ACE light comes on on the dashboard.
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How the Parts Actually Work Together
ACE is just a collection of parts that have to get along to keep your car from leaning like a boat in corners. Here’s the rundown:
- Accelerometers: One up front, one at the back. When you chuck it into a bend, they feel the sideways shove and let the system know how far the body is tipping.
- ECU: The box that thinks. It reads the accelerometers, does the maths on how much the suspension needs to move, and fires off instructions to everything else.
- ACE Pump: Squeezes the hydraulic fluid up hard so there’s instant pressure ready to go when the system calls for it.
- Valve Block: A metal block full of little valves inside. They open and shut to route the fluid to the right places and stop the pressure from going mental.
- Hydraulic Actuators: The heavy lifters. They shove against the torsion bars to physically hold the body flat. On a Discovery 2, it’s the RQK100000 ram doing the graft.
- Torsion Bars: Thick metal bars the actuators twist against. They store and release energy as you go through the corner, keeping the whole thing from flopping about.
- ACE Fluid: Proper hydraulic oil, not whatever’s lying around. It carries the pump’s pressure all the way out to the actuators so they can actually push.
- Pressure Transducer: A sensor that never stops watching the pressure. If it drops too low or spikes too high, it lets the system know something’s up.
What Happens When You Turn In
When you steer into a corner, the sensors feel the sideways pull straight away and send that info to the ECU. The ECU works out how much the car is starting to lean and tells the hydraulic pump to get going. The valve block then routes the pressurised fluid to the actuators, which push against the torsion bars to keep the car flat while you’re mid-turn.
At the same time, the ECU might also talk to the Timing Advance Processor to tweak the ignition timing, since the engine load shifts around while you’re cornering. The pressure sensor is always watching to make sure nothing’s getting too hot or over-pressurised. Once you’re out of the turn and the road straightens out, the system relaxes back to normal and gets ready for the next corner.
When Things Go Wrong
The ACE system works well most of the time, but it can develop problems. Here’s what to watch out for:
What the Lights Mean
Amber Light: Usually nothing too serious. Could be low fluid, a sensor that’s come loose, or just the system doing its startup check.
Red Light (flashing or solid): This is the bad one. Means something major has happened—maybe the whole system has packed up or there’s a big hydraulic leak. Don’t ignore it.
Why Your ACE Light Might Come On
- Fluid Leaks: The seals get old and harden up and the crimped ends on the pipes can crack or split. Fluid starts dripping out, the system can’t hold pressure properly, and the warning light comes on.
- Low Fluid: Nine times out of ten, this is because something’s leaking. Once the fluid level in the reservoir drops too far, the pressure falls off and the light fires up.
- Sensor Issues: Accelerometers can pack up, or the pressure sensor can get damaged or knocked loose. When that happens, the system doesn’t know what’s going on anymore and the amber light shows up.
- Pump Trouble: The pump itself can wear out over time, or it might not be getting enough oil to itself. Either way, pressure drops and the car tells you about it with the warning light.
Looking After It
A bit of regular care goes a long way:
- Check the fluid now and then. Keep it topped up with the right stuff, and make sure it stays clean.
- Look for leaks. Check the valve block, pipes, and O-rings. If you spot a drip, get it sorted before it gets worse.
- Use the diagnostic kit. Plug in TestBook to read any fault codes, especially if a warning light is on.
- Bleed the system after any work. This gets rid of trapped air so everything works properly.
- Keep it clean. The ACE system hates dirt. Use clean tools, clean containers, and cover any open ports when you’re not working on them.
- Check the parts. Look at the actuator gaiters for wear, and make sure bolts are tight (actuator to short arm: 185 Nm, to long arm: 48 Nm).
The Good and the Bad
What’s Great About ACE
Better handling: The car stays flatter in corners, so the tyres keep more grip and the whole thing feels more planted.
Safer: Less chance of the back end stepping out or the car getting away from you on a bend.
More comfortable: You don’t get thrown around as much, especially on twisty roads.
Works everywhere: Whether you’re crawling through town or tackling a muddy trail, it helps out.
The Downsides
It costs money to fix: A new pump or valve block can set you back $150 to $500 or more.
It’s complicated: All those hydraulics and sensors mean most jobs need a proper mechanic with the right gear.
Old cars suffer: On older Discovery 2s, pipes and valve blocks can rot through. The repair bills stack up, which is why some owners just rip it all out and fit normal anti-roll bars instead.
Final Word
ACE is a clever bit of kit that makes a big, heavy SUV handle far better than it has any right to. It keeps the body flat, the tyres stuck down, and the driver feeling confident—on tarmac or off it. The hydraulic system and sensors do the hard work in real time, and you feel the difference.
That said, it needs looking after. Check the fluid, watch for leaks, and keep an eye on the sensors. Repairs aren’t cheap, but for most people, the better drive is worth it. It’s one of those features that mixes comfort, safety, and performance into one package—and when it’s working, you notice.
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