Rear end sag, OEM vs Aftermarket

[lemmingjames]

So rear end sag affects all 911's (i imagine and not just the GT's) and after say 7 years or x amount of miles, it all needs refreshing.

Now are after market suspension components also susceptible to this or are they a bit more robustly built?

Ive got mine booked in at CG in 6 weeks time for OEM refurb etc but just wondering if its worth going with Ohlins R&T. Though if the Ohlins will suffer as well, it wont be worth the extra outlay for how i use the car if you know what i mean?

[PorscheGT4]

the GT3 used H and R springs just buy those again.

But these never need a refresh ;-/

[lemmingjames]

Didnt think you owned yours long enough to find out

[Trev450]

All dampers will deteriorate over time, but the benefit of Ohlins, KW, etc, is that they can be rebuilt.

[Slippydiff]

lemmingjames said:

So rear end sag affects all 911's (i imagine and not just the GT's) and after say 7 years or x amount of miles, it all needs refreshing.

Now are after market suspension components also susceptible to this or are they a bit more robustly built?

Ive got mine booked in at CG in 6 weeks time for OEM refurb etc but just wondering if its worth going with Ohlins R&T. Though if the Ohlins will suffer as well, it wont be worth the extra outlay for how i use the car if you know what i mean?

The springs and dampers aren't bad quality, but the rears do get to live a hard life, having to control both the weight of the engine and 'box and being heat cycled by the exhaust system. Both the front and rear springs are susceptible to corrosion issues.

Fitting a new set of springs will maintain the OE ride quality and refinement, added to rebuilt OE Bilsteins, the whole process will cost you £400 + vat for the damper refurb and another £260 + vat for the springs. There's a fair chunk of labour for removing and refitting the dmapers and springs along with the subsequent setting of ride heights, corner weights and geo set up. But it still falls a long way short of the cost fitting a set of Ohlins R & T's.

The Bilsteins should give you another 20k miles at which point they'll slowly start to deteriorate (they've modified the damper rod bushes and seals, and thus they should remain oil tight far longer than the original build spec dampers) The springs will probably last another ten years, and longer if you waxoyle them and the dampers after they've been installed.