I did some searching, and couldn't find an answer...

I've been pondering getting the Tein Flex w/ EDFC. According to the 2007 catalog, the Flex spring rate is 672 lbs/inch (12 kg/mm). (This is in contrast to previous years, which I understand were at 10 kg/mm.) My question is whether it's possible to dial down the stiffness so that it's at stock, for freeway driving. I have an an 04 coupe with the sports suspension package.

Any comments appreciated. Thanks!

 

no, you can only make them stiffer by adjusting the preload

 

No

For one, 04 coupes don't have a sports suspension package, your on a setup that is softer then 05-07 coupes that do have legit sport suspension (it's easy to get confused with Infiniti calling the regular suspension you have as being "sport tuned'). Also owner review's on the subject are mixed, a very good read would be to look up THX723's comment's about his Flex setup.

With the Flex coilover having full height adjustablity their is no reason to adjust spring preload beyond minimum levels

Knowing how your oem setup drives, you better off making a different coilover choice. Tein CS, HKS RS, Bilstein PSS9 or KW Varient 2 all come to mind, though the HKS RS will be hard to find in stock.

 

Geez, this is confusing. Okay, the Tein CS (7 kg/mm) seems more suited to me. Poking around, though, people have been mentioning the SS (which ahs to be ordered from Japan) as halfway between the CS and Flex. But the weird thing is that the CS and SS seem to have almost identical stats, judging from the web site (code is for Skyline CPV35):

CS: http://www.tein.co.jp/search/search1...=NISSAN&lang=e

SS: http://www.tein.co.jp/search/search1...=NISSAN&lang=e

What am I missing here?

 

The CS is valved for it's mission as a ride comfort product, whereas the SS is not. Both have the same spring rates, but the valving is different between the two. IMO, in a perfect world Tein would market a CSP coilover with performance valving, full height adjustability, and 560/448 spring rates.

Know that getting a SS coilover does mean a slow boat ride from Japan unless you pony up air freight charges.

You mention wanting a stock ride quality, but what else do you want out of the parts once they are installed?

 

I was interested in the ability to adjust the settings on the fly (EDFC) from stock (or near-stock), to a stiffer setting for twisties. My driving is a mixture of highway/city driving, and driving in the hills.

The problem with the Flex was that, as I understand it, even the softest setting is substantially stiffer than stock. On the other hand, I wasn't sure if the Comfort Sport would be too soft for the hills.

 

EDFC controls dampening. Not to be confused with spring rate.

 

you can order the rear springs from the super drift suspension which i believe are like 9kg/mm. Acccording to the tein rep i talked to you can use any of their g35 rear coilover springs as they all share the same ID and unsprung height.