In reading pages of info on spring & shock upgrades, I came across the following reference which I found very helpful and confusing at the same time.


Given that factory / stock front spring rates for post-'91 964 & 965 are @169 and the only difference on rear spring rates exists only between 964 NB and 965/M030/RSA, why does the aftermarket springs have much higher front rates on RSA and Turbo? I would have imagined the aftermarket spring rates for turbo and non-turbo to be nearly the same, while the rear carry a much higher spring rate to maintain overall F-R rate ratio. This got me to wonder if it is logical to use H&R green front and H&R rear to maintain factory balance and to possibly find a happier compromise for the street between softer greens & turbo reds.

Since I really don't have much knowledge on springs & suspension upgrades for 964/965 other than taking out my Visa card, I hope to make a more informed decision before the upgrade.

 

Not sure anyone, here, can answer the question as to why H&R decided to change the relative rates of their spring sets. What this change suggests, however, is that their option will reduce your car's tendancy to oversteer more so than the Factory RSA and Turbo springs. There's some good info at the Rennsport Systems website which expands on the impact various suspension changes have on your car's handling chacateristics, in case you're interested.

As for mix and matching H&R spring pairs, I believe they only sell them in sets of four (someone, feel free to correct me if I'm wrong). But what it really comes down to is What is it you're after? If it's ride comfort, I can tell you that going from the stock linear springs to progressive rate aftermarkets is a pleasant surprise. While the max spring rates may be higher, IMHO, the progressive design provides a less jarring ride than the stock coils.

Make sure you consider upgrading the shocks at the same time (if your car still has the stock parts). Not only is the expense of installing, balancing and aligning your car something you want to experience as infrequently as possible, you'll also be robbing yourself of one of the best upgrades for your car--new springs and shocks. The transformation will be nothing short of miraculous.