Spring length - loaded

[Rusty]

I'm after approximate lengths of springs, on the car and under load please. It's not too easy but I've measured my blue HnRs and get approximately:-

160mm Front
180mm Rear

Free length:-

310mm Front
280mm Rear

Compression:-

150mm Front
100mm Rear

These translate to about a 635mm rideheight (to the arch) with 225/45R17s, compared to approximately 660mm as stock. This is slightly skewed by different top mounts and removing the rear trim... I'd expect a further 10mm lower on a back to back test.

We know from previous threads that the spring rate of coupe HnRs is about 200lb/in so

Front - 150mm compression (6")
6 x 200 = 1200lb = 545kg

Rear - 100m compression (4")
4 x 200 = 800lb = 363kg

Total = 2 x 545 + 2 x 363 = 1816kg

A little OTT but then that does not take into account the variable rate and as the front springs are not quite completely bound at the base, this will make a difference.

Lloyd's thread here suggests that the pre-bound rate is aboutr 130lb/in so using that figure

Front - 150mm compression (6")
6 x 130= 780lb = 354kg

Rear - 100m compression (4")
4 x 130 = 520lb = 236kg

Total = 2 x 354 + 2 x 236 = 1180kg

So, assuming a combination of the two spring rates, the stated deflections and rates do seem to be about right.

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I could do with some more measurements from HnR owners and also from people with OE springs.

[Error404]

I've got some Coupe H&Rs in the garage I can meaasure the free length mate.. will be fitting them soon but won't have the same weight over the front axle as an S2 just yet so i'm not sure any measurements of the compressed length will be any use

[Rusty]

Yeah, ABY or 3B is more use, can look at Avant too if I can get some idea of dims.

[Rusty]

Have done some calculations on this to see what sort of sag one can expect on some uprated springs. If I can get a measurement off a stock car then that would be really useful please. Am nearly at the stage where I can start speaking seriously to spring suppliers.