I just got my car outa the shop too (twin turbo) and have the S-tech's and Hotchkis sways on it right now on 19's...My car has always felt floaty even after the springs/sway bars. If I take a turn too hard, the car pushes a whole lot to that side and then VDC comes in :-\. I'm used to my eclipse gs-t on a 1.7" drop and 18's handling pretty good. I could tell the weight of the G doesn't help it at all. I'm also looking at some coilovers. Hopefully someone can give a review of the Eibach coilovers.
sorry to hijack your thread but I have pretty much the same questions.

 

The reason why you guys are experiencing this is because the rate on the S-TECH's / H-TECH's are lower than the rate on the stock springs of the G35 so this springs opose less resistance when cornering/braking/launching.
for instance what you myght want to do is go with the D-spec or springs like ESPELIR wich have a much higher spring rate.

 

Part of the equation is the increase of weight you added with the TT kit. It's not as bad as having professional linebackers in your car...but you get the idea about how the added weight is affecting your ride. If you can afford a TT kit, you can afford a good coilover system. If you like creature comforts of EDFC, go with the TEIN Flex system. If you want something hardcore at an affordable price withuot sacraficing quality, go with SilkRoad RM/A8. If you just want to waste money on hardcore coilovers, go with Swift Coilovers or Zeal coilovers. With the RM/A8, Swift and Zeal coilovers (I think Flex too), you can specify the spring rate that you want. Since you now have added weight of a TT kit, you might want to up the spring rates a little bit. There's a certain formula to help with choosing the spring you need to the way you drive...I'm too lazy to look for it. Try using google to look for the formula, to help you spec your spring rates if you decide to go the coilover route. Or you can enlist the help of the coilover manufactures to help make the right decision.

 

I could deff. feel a bit more weight up front from the TT. I thought I was just hallucinating. I'll have to deff. look into a set of coilovers.

 

+1 with G35zkyline.

the spring rates on the rear are too soft and does not return the
car back to its proper upright posture after turning or drving over
bumps/dips. the dampers are also too soft to slow down the
compression. that's where you are getting the floaty feeling.

try some D-Specs on your current springs or just swap out the
springs at the same time to something stiffer.

 

Infortunately i don't know enough about spring rates and weight to even try to calculate what springs i might need. I'll try looking for that formula... Yeah i can afford coilovers but i don't want them if i don't have to have them. I'm really interested in height adjustment cause i think i rear could be dropped an additional inch ( probably not safe since my exhaust rubs in certain situatuions) So it seems like what you guys are saying is i can go with coilovers or harder springs and D-specs.

 

I've heard HKS coilovers are pretty good and are fairly easy to adjust. What can i do about bringing the back down a bit.

 

Hey guys, million dollar question, if i don't want to calculate spring rates and all that crap, can i just get Tein Flex coilovers and be able to adjust height and spring preload independently. Giving me a the ride height that looks good to me and the firmness that i love.

 

Flex is pretty firm... like the old TypeHA territory...one step before the RA series. imho, they are too stiff for street but there are many people
that are happy with the Flex.

I use to have a 98 lude and a 02wrx running HA's...they felt good for
a young guy that I was, but no more. ive out grew those stiff suspensions
for street. anyway, just being stiff does not equal good handling.

the firmest coilover i would go for street is TypeCS. 390-400lbs/in

 

But if you adjust the spring preload doesn't that affect the firmness?

 

no, it affects the amount of room you have for shaft movement.

 

chaos- yes, that is the beauty of the Flex...to an undertermined amount
the preload can be adjusted to be firmer with the "Flex" ibility to adjust
height without changing that new preload...but unless you have the car
professionally corner weighted that added function is worthless as the
rates will now vary corner to corner which could adversly affect handling.

The Flex has 2 ways to adjust height.
1. by the spring seats as a normal coilover.
2. by the shell of the piston housing.

but the bottom line is that those springs are linear rate at
670lbs/in...it will not get any softer than that.

that is like twice the nominal rate im running...

 

IM still trying to figure out how the flex "guys" are doing it. I went with the CS, and for the most part very happy. IM getting a flotty feel at high speeds in the rear. My guess is my setting are a bit soft in the rear. Butt IM talking at speeds of 80 plus. IM no suspension expert
But, I would listen to Kenchan

 

Things that sound dirty but aren't!

 

LOL Good one there Gourd.