So I'm a little confused here. The part you linked above is the Front No2 accumulator. That part only exists on the front left and right. There is another set of accumulators that are at all 4 corners, called "relief gas chambers" in the published AHC documentation. When I look at the front "relief gas chamber" at Partsouq, it appears it's called the "ACCUMULATOR SUB-ASSY, FRONT SUSPENSION CONTROL NO.1, RH/LH" Part # 49041-60030. This part is off by itself forward of the damping force actuator on the front and directly connected to the damping force actuator on the rear. The rear "relief gas chambers" are part # 49158-60010 (Called "ACCUMULATOR, REAR SUSPENSION CONTROL, NO.3, RH/LH" on Partsouq). The relief gas chambers and the No2 accumulators have very different functions and are charged differently.
It sounds like you replaced the No2 accumulators in the front and the relief gas chambers in the rear. Just trying to get the details ironed out before people start replacing these parts.
Both types of accumulators (relief gas and No2 chambers) are built the same, but the relief gas chambers are charged different front to rear and have much higher internal pressure than the high spring rate No2 accumulator. The front relief gas and No2 chambers have the same internal volume while the rear relief gas chamber is larger. The relief gas chambers seem to be there to protect the hydraulic lines, dampening big hits to the suspension to help from blowing out the lines. The high spring rate No2 chamber is always inline with the system. The way the AHC ecu "engages" the higher spring rate (during turns and hard braking) is it shuts a valve off disabling the No1 chamber making the No2 chamber (and relief gas chamber) the only devices controlling spring rate on the front end. As can be expected, 95% of the time, this valve is not activated and the No1 chamber is generating most of the spring rate for the front end.
From the AHC description (More detailed descriptions below):
No. 2 Gas Chamber (High spring rate): (Part # 49147-60010 FL/FR) Acts like a gas spring by partially utilizing coil spring force.
This is provided on the front wheels.
| No. 2 Gas Chamber | Front | Rear |
| Sealed Gas | Nitrogen | n/a |
| Gas Chamber Volume (cc) | 120 | n/a |
| Sealed Gas Pressure (PSI) | 261 | n/a |
Relief Gas Chamber: (Part #s 49041-60030 FL/FR, 49158-60010 RL/RR) Protects hydraulic systems by restricting increase in the
hydraulic pressure inside the hydraulic tubes.
| Relief Gas Chamber | Front | Rear |
| Sealed Gas | Nitrogen | Nitrogen |
| Gas Chamber Volume (cc) | 120 | 150 |
| Sealed Gas Pressure (PSI) | 1958 | 1450 |
No. 1 Gas Chamber (Low spring rate): (Part #s 49141-60020 FL/FR, 49151-60020 RL/RR) Acts like a gas spring by partially utilizing coil spring force.
This is provided on the front wheels.
| No. 1 Gas Chamber | Front | Rear |
| Sealed Gas | Nitrogen | Nitrogen |
| Gas Chamber Volume (cc) | 400 | 400 |
| Sealed Gas Pressure (PSI) | 328 | 276 |
Detailed descriptions from the AHC documentation:
No. 1 Gas Chamber
- The No. 1 gas chamber is provided for each of the wheels. This gas chamber is designed with a low compression rate utilizing a large-volume gas chamber.
- The front No. 1 gas chamber is provided for the front suspension control valve assembly.
- The rear No. 1 gas chamber is provided for the rear suspension control accumulator assembly.
- The No. 1 gas chamber uses the bladder filter type hydro-pneumatic accumulator. A resin membrane is sandwiched between rubber layers to realize excellent gas penetration resistance.
- The internal pressure of the gas chamber is varied by allowing the fluid to flow in and out of this gas chamber in order to raise or lower the vehicle height.
No. 2 Gas Chamber
- A No. 2 gas chamber is provided for the front suspension control accumulator assembly. This gas chamber is designed with a high compression rate utilizing a small-volume gas chamber.
- The No. 2 gas chamber uses a metallic bellows type hydro-pneumatic accumulator, to prevent gas leakage.
- The internal pressure of the gas chamber is varied by allowing the fluid to flow in and out of this gas chamber in order to raise or lower the vehicle height.
Relief Gas Chamber
- A relief gas chamber is provided for each of the wheels. This protects the hydraulic system by reducing increases in the fluid pressure inside the hydraulic tubes for the 4-wheel active height control suspension.
- The front relief gas chamber is placed directly over the front hydraulic tubes.
- The rear relief gas chamber is provided for the rear suspension control accumulator assembly.
- The relief gas chamber uses a metallic bellows type hydro-pneumatic accumulator likewise with the No. 2 gas chamber.
- The fluid inside the hydraulic tubes is allowed to flow into the relief gas chamber when the fluid pressure inside the hydraulic tubes exceeds the pressure of the nitrogen gas sealed in the relief gas chamber. Thus, fluid pressure increases inside the hydraulic tubes can be reduced.
