blackozvet

I have now bought 2 x sets of coilover springs for my rear coilovers.

A pair of QA1's rated at 350 lbs - tested at 331 lbs.
A pair from a business that sells to the riceburners and drifters, rated at 7.5 kg - which converts to around 400 - 420 lbs - actual rate 291 lbs !

for the people that have tested their springs against the advertised rate over the years, which brands are usually close ?

below on the left is the spring that was sold to me as being around 400 lbs against a real 450 lb spring.

96CollectorSport

I rate each spring before I install them and Hyperco are going to be the closest, they are +/- 3% if I remember correctly.

xtremeyolks

Swifts or hyperco seem to be the most true to rate I've seen.

GSpeed

Swift, hyperco, or eibach. Beware of spring shape on hyperco, see this thread-

https://www.corvetteforum.com/forums...to-tierod.html

blackozvet

thanks guys, good to know, I can get Hyperco in Aus, if I want Eibach will have to get them from Summit.

The guy who tested my springs said that typically most coil springs that he tests are anything up to 10% below advertised rate - which isnt really helpful if targetting a certain spring rate for the track !

its amazing how a 'fat' spring can cause clearance issues, had that in the front going to a higher rate.