MK1 C5 Difference Between HM3 vs HM3+ ?

[IHateMySelf]

Hi this question relates to the mk1 C5, can anyone tell me the mechanical difference between the hm3 and hm3+ ?

I've read that the HM3+ has different comfort shpere's or something to that effect. Can anyone confirm this?

Thanks!

[Stickyfinger]

Selectable "Sprots" mode

[vborovic]

But not all Mk1's had the option of HM3+, right?

[Stickyfinger]

Correct, only 2.2's (I think). My 2ltr Mk1Exclv. did not

[GiveMeABreak]

Selectable "Sprots" mode

Don't leave home without your "SPROTS"

In a nutshell: On the earlier Mk1 C5s the Hydractive 3 system had variable ride height that was automatically raised or lowered slightly according to road surface, speed and driving conditions. The Hydractive 3+ system reserved for the higher spec. models offered a 'Sport' mode setting that the driver could manually activate.
On the Hydractive 3+ systems there was an additional sphere on each of the axles and a stiffness regulator. Whilst 'Sport' mode is in effect (either manually or automatically) the system and the stiffness regulator cuts out the additional third sphere on each axle and re-energises these when it switches back to 'comfort' mode. When the 'Sport' mode is selected manually by the driver, the system maintains the 'sport' settings more frequently than normal. Here's a video on the Mk1 Hydractive 3+ (in French, but you'll get the idea).


On the X7 there are 7 active spheres in comfort mode and 4 in sport mode. - Here's an explanation:

[Stickyfinger]

Sprout mode sorry

[GiveMeABreak]

Great entertainment value this Forum!

[vborovic]

Fun for the whole family ...

[Peter.N.]

I can confirm that. I had a 2.2 with hydractive suspension but the fuel consumption was dreadful so I got a 2.0. but although I have fitted new spheres and rear suspension bearings it still doesn't ride as well as the 2.2 did and certainly not as well as the XM.

Peter