I was thinking about to put the front spring in the rear and the rear in the front. Not sure if that will help.

 

That's impossible. The front and rear springs are completely different. If you wanted different spring rates you would have to order new springs.

 

Actually, even though the Jic's reuse the oem rear spring location, they do not use a oem like rear spring diameter. Take a look at this owner's rear spring setup solution and how he intergrated the oem upper spring seat. Notice the diameter of the spring in relation to the upper spring seat mounting pan (best way I can think of to describe, sorry). First pic I believe show's you the Jic mounting system, after that the pics show how the owner did his mods.




The modified upper spring seat (that was NOT easy to make flat like that I'll tell you right now)


See how the Jic height adjust now sit's neatly on the modifed oem upper spring seat


I guess this is the Jic rubber insolator modified to be used for the lower spring seat isolator.


Installed







IMO, I would definatley NOT run a 12Kg/10Kg setup. The Z33 Jic setup is notorious for having the worst ride quality outside of D2/Kg-Mm coilovers. Going stiffer than 10Kg in the front would only make that worse. I'd go down to 10Kg in the rear or lower like Fritzman did on his Z setup. But a word to the wise about Fritzman and what he said, he promtly sold his Jics after he said how good they were with 9Kg and 8Kg rear springs,....hmmmmm. Never the less, I'll be testing a heavy front spring rate biased setup shortly.

 

Hmmm.. that's interesting stuff Jim. I see now that the diameter of the rear JIC springs are not nearly as wide as the OEM rear springs. But would they still be able to work on the front shocks? Also I talked to Ben at JIC recently and he told me that the FLT-A2's for the sedan was less agressively valved compared to the Z33 model and that the spring rates are 9kg/6kg. You think the ride quality would be vastly improved according to your speculation? Anyways thats not the most important question. What front heavy spring rate biased setup are you going to test soon?

 

The modified upper spring seat (that was NOT easy to make flat like that I'll tell you right now)


Thanks for the picture. How did he make his upper mount like that? My is a ice cream cone shape. Also I dont really understand the fourth picture. It look like a stock rubber isolater. how did he get it to fit on the JIC spring? since the spring is smaller then stock.

 

If the rear springs are the same diameter and the proper length, "using" them on the front would be a non issue. For the reason's I mentioned I don't think that would be a good idea at all and something tell's me Jic's tech's wouldn't think so either, though they just might have the dampning range to handle them, doesn't mean the result would be positive.

Given Jic's reputation on ride quality concerning the Z33 setup, I'd hope that the G coupe fitment and G sedan fitment certainly are valved less aggresively. However, it's $1700 to find out. I don't know if you aware of it or not, but a member here bought a sedan Jic setup and tried to resell it here and on ebay. The ebay ad was pulled, we might have a member here that bought the setup and hasn't spoken up. I was planning a 11th hour bid on the ebay ad, but never got a chance.

About the setup, it's really to premature to give any details. Problem is, if a certain vendor here would have delivered to me when they promised and not have totally dropped the ball I could have something to say. I will not and cannot recommend them, thankfully we have other sponcers that I can look into. Only when the setup is installed and tested and allow's me to do a full post with pics to explain can I bring out any details.

 

Well he "simply" sliced off from the point where the spring actually rest's on the seat and made the surface level to the center. "Simply", oh HECK no, those seat's are basically a big ole chunk of tire rubber and cutting them is NOT easy at all. How he did it and with what looks like percision, I would truely love to know, hat's off the the man. Sorry I do not know his membername from my350Z.com and the post that he did was some time ago.

Since you would know what the Jic spring isolator looks like and not me, then yeah he must have modifed the oem lower spring seat rubber part. Look's me like he trimmed the oem part to fit.

 

Probably just gonna sale the suspension, too much work. Thanks for the help guys.