VAP Progressive Springs?

[KevinBird]

Has anyone fitted these? https://www.velocityap.com/product/aston-martin-db...
I can't find a review anywhere, it seems they just lower the ride height but it's unclear if they improve handling or if they work OK with the ADS

[bogie]

thread here https://www.pistonheads.com/gassing/topic.asp?t=17...

most people do lower the car for the looks.

Personally I prefer the car to be more usable day to day and not scraping the front splitter getting off the drive

[KevinBird]

bogie said:

thread here https://www.pistonheads.com/gassing/topic.asp?t=17...

most people do lower the car for the looks.

Personally I prefer the car to be more usable day to day and not scraping the front splitter getting off the drive

Thanks but no reports there on any improvement in handling

[JohnG1]

"In addition to the superior materials, these springs also feature a unique manufacturing process that sets them aside from most OEM & Aftermarket applications – a Tapered Wire Progressive Rate design. The Ultimate in Design. The principle is simple: By using a tapered rather than constant diameter spring wire, our springs achieve a truly progressive spring rate over the length of their compression & travel. The spring rate increases when you need it (cornering) and decreases when you don’t – yielding a smooth and supple ride over bumpy
surfaces. The best of both worlds!"

Sounds like good stuff. Wonder if they've got any benchmarking data - before/after performance?

[KevinBird]

JohnG1 said:

Sounds like good stuff. Wonder if they've got any benchmarking data - before/after performance?

That's what I was hoping to find but nothing so far

I've also emailed Stuart at VAP and asked him if they've ever been reviewed by the press

[CoolHands]

Progressive springs are nothing new. Personally I think it’s just marketing rubbish - no oem fit progressive springs on anything as far as I know.

[Jon39]

Progressive Springs.

Are all coil springs (quite thick coiled rod, used for automobile suspension) progressive ?

In other words, the more the coil is compressed, increasingly more pressure is required to compress the coil further, until it reaches the point of being fully compressed, where every coil is pressing against the adjacent coil.
A Sunday morning thought.

PS. There was a period, just a few years ago, where various car manufacturers experienced a spate of snapped coil springs.
Is that all over now ?

Edited by Jon39 on Sunday 13th June 11:36

[Handyman2009]

6speedonline forum there are lots of people using those springs might be worth asking there

[KevinBird]

Handyman2009 said:

6speedonline forum there are lots of people using those springs might be worth asking there

Good thought so I put a post there and someone has some for sale!

[MichaelV8V]

Jon39 said:

Progressive Springs.

Are all coil springs (quite thick coiled rod, used for automobile suspension) progressive ?

In other words, the more the coil is compressed, increasingly more pressure is required to compress the coil further, until it reaches the point of being fully compressed, where every coil is pressing against the adjacent coil.
A Sunday morning thought.

PS. There was a period, just a few years ago, where various car manufacturers experienced a spate of snapped coil springs.
Is that all over now ?

Edited by Jon39 on Sunday 13th June 11:36

Normal coils springs tend to be linear, i.e. x force compresses y mm, 5x compresses 5y mm. Progressives will compress a lot initially, so smooth out small bumps, then as they compress they effectively become stiffer as the more compliant part of the coil is fully compressed, and any further movement is done by the stiffer part of the coil.

Snapped coil springs seem to have become very fashionable now, both fronts of my 2010 V8V snapped in the last year, I mentioned it to a neighbour and he had snapped 7 springs from his three cars in the last two years. I suppose cars are getting heavier, and the roads are getting worse.