Ok, so i didn't get the sports suspension package, don't ask me why, but i didn't. Im feeling the car is more luxary than i would prefer, so id like to upgrade the suspension. So far ive looked at Tein H-tech and S-tech, and the Eibach Pro-kit. Just wondering what kit you guys would recomend for a good value to price ratio. Also, how much do you think a shop would charge to put in one of these new suspension ktis? Thanks!

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When you say you didn't go for the sport suspension and then say your wanting to upgrade the suspension, what do you mean? Does upgrade just mean to lower the car?

If you want to keep the ride quality close to where it's at now, most of the G35 sedan springs are designed with that in mind. Be sure your ok with the published drop amount. I can say that Eibach's developement car for the Eibach's was a non sport sedan. Can also add that many with the Eibach's have commented that the drop is a bit more than the 1.1" drop Eibach says's you'll get.

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If i were to put on a kit like the eibachs or teins of 350z suspension would i notice an improvment in cornering ability, and an overall lower body roll, or are these kits just for that inch or two of drop...basically to look cooler?

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I am not an expert for suspension but I believe anytime you lower the car and hence the verticle center of mass it will reduce its tendancy to roll no? Require more torque to roll the car because the distance from the center of mass (verticle) to the ground has decreased.

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basically, lowering springs such as eibachs or teins would only make your G feel like its cornering better because of the lowered center of gravity. mainly, lowering springs only improve aesthetics (looks) of the car. also, because the spring rates vary from hard to soft rates, depending on those rates, they would do a number on your shocks overtime.

if you were to improve performance quality and not just looks, look into getting a full 350z suspension with the springs AND shocks. this would lower your car a little more than an inch front and back and since you have the shocks/complete suspension and not just springs, it would increase performance i believe. at least, that's what i'm thinking

or, u can go the other route with more money and buy a coilover kit and not just lowering springs.

PM Gsedan35. he's helped me with all my quesitons about my suspension.

good luck,
matt

 

Definately can't afford a coil-over kit, but ive heard from others that lowering springs will increase handling, but your saying that it will just feel like its handling better...

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It really all depends. Just because you lowered your car doesn't mean it's going to handle better than it did with the stock springs. If the lowering springs were stiffer than the stock ones, then yes. Lowering the car will give better center of gravity, but if the lowering spring has a softer spring rate than the stockers than any gains from lowering center of gravity will be negated by the softer spring rate. Basically if you buy lowering springs and want better handling make sure the springs have a stiffer rate than what the stockers are. Also you have to consider the differnce between linear and progressive springs. IMO, a person with a non sport sedan who wanted better handling but still wanted to retain some decent level of comfort could do one of these three things...

1. Buy a stock G35 sport package suspension from somone who's selling. The springs are stiffer and the shocks are valved tighter than the non sports.

2. Buy a stock 350z suspension from someone who's selling. The springs are about as stiff or even a little stiffer as the G35 sport package springs and the shocks are valved even tighter. This will also drop the G a little more than an inch all around.

3. Buy someones G35 sport springs, or 350z springs, or some linear, stiffer aftermarket springs. Then combine those with aftermarket performance shocks such as the Konis or upcoming Tokicos.

You could always go all out and get a full race coilover setup like JIC FLT-A2s or Tein Flex but unless you road race or autox alot, then I don't think it's worth the money just to say you have them. Also no matter what suspension setup you go with you can get aftermarket sway bars to fine tune the body roll. But the best way first and foremost to better handling is in the springs.

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So are the Tein H-type, or S-type or Eibachs stiffer than the stock springs (non sport package)?

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Also, if anyone knows someone or has an available 350z suspension kit for sale i would be very interested, the increased stiffness and drop sound very appealing. Thanks!

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i agree. i was just actually thinking about how i forgot to mention getting a stock sport suspension from a G sedan like Dklau says on no. 2. this was actually what i was thinking while considering a 350 Z suspesion because it doesn't drop the ride height any.

earlier, when i was thinking about suspension upgrades, Gsedan35 mentioned getting Tein H-Techs from the Z and putting them on the G sedan. this would give a better performance upgrade than eibach springs because i believe that they are stiffer. you may wanna look into that and see the drop height becuase the G sedan would be lower than the Z if u were to use springs that were made the for the Z in the first place. sorry, i dont have the exact numbers, it was a while back . .

good luck,
matt

 

So between Tein H-techs and Stock Suspension package what would be the best way to go? Asking purely on performance not looks.

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I have upgraded to Tein coilovers and have this system (shocks, springs, struts) for sale. It is 4 months old with less than 2000 miles. This system fits directly on the sedan to give it a firmer ride, better handling and a lower stance (approximately 2 inches). It also fits directly on the coupe. I accept all reasonable offer. Thanks.

 

I meant I have the '04 350Z suspension system.

 

No! Lowering a vehicle does NOT mean less body roll. This is a misconception by many. Lowering a vehicle lowers its roll center and center of gravity. Unfortunately, it does not lower them at the same rate. A lower roll center is not necessarily a good thing. Finding a roll center is a hard process without proper equiptment, but the lower the roll center, the more roll that is induced. Picture the roll center as the point in which the vehicle rolls about; if it is up tight to the chasis (closer to the center of gravity), it will roll less. If it is further from the center of gravity (closer to the ground) there is more leverage for roll. The distance between the roll center and the center of gravity is called roll-couple. Ideally, you want the roll center to be as close to the center of gravity as possible. The lower you lower your vehicle, the further the RC gets from the CG. This is not a good thing. Generally, people experience better handling due to lowering because of higher spring rates which help reduce the amount of roll which is induced by lowering the roll center and increasing the roll couple. This is not a bad thing, except that ride comfort is compromised, as well as tracking over rough surfaces. All in all, lowering to an extent is acceptable, but lowering too far can create far worse handling. Ideally, you would want to get a good compromise between a low center of gravity and reduced body roll. To achieve this, you must find a set of springs that have a higher spring rate than stock without lowering the vehicle too far. Not to mention a good front to rear ratio (roll axis). If the rear roll center is higher than the front, you can expect oversteer in most cases, but not in all. This is dependant on vehicle weight ratio and suspension dynamics.

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As posted by GSedan here are the stock spring rates. I would assume that the non sport springs would be less than the sports. How much I don't know but probably a good amount. I don't think there are any published numbers on the Eibachs.

Stock spring rates
F/R in lb/in
350Z and G35 coupe: 347/419
G35 sedan with sport: 357/407


The Tein H-Techs are lbs front/rear drop in inches front/rear:
Sedan -- 324/263 -1.4/-0.7
Coupe -- 324/263 -0.6/-0.3
350z -- 358/375 -0.3/-0.2

The Tein S-Techs:
Sedan -- 358/274 -1.2/-0.9
Coupe -- 358/274 -0.2/-1.3
350z -- 386/402 -0.7/-0.6

Remember the drop numbers for the coupe and Z are based on those cars so using those springs on the sedan would have even a further drop. Based on the spring rates alone none of the G35 springs really look appealing over the stock sport G35 springs. Maybe the 350z H-Tech or S-Tech springs would be worth considering but the drop would be quite large and would be personal preference.



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