Ok, I've read lotsa posts on different setups, but here's your chance to tell me what to do...
I'm trying to decide between the Eibach Pro Kit or the Tein H-Tech springs for lowering my '05 sedan. I want the drop, but don't want to change the ride characteristics anymore than necessary. Very happy with the stock sport package. Also don't want to go really low, just about 1".
Ok, I've read lotsa posts on different setups, but here's your chance to tell me what to do...
I'm trying to decide between the Eibach Pro Kit or the Tein H-Tech springs for lowering my '05 sedan. I want the drop, but don't want to change the ride characteristics anymore than necessary. Very happy with the stock sport package. Also don't want to go really low, just about 1".
Thoughts? Thanks!
thx, you should really go with the Teins. Eibach is known for a long-term sagging problem. Also, the Teins are a neat gold color and come in a prettier box.
Did I mention that you my favorite poster in the forum? I think you're swell.
The H tech use spring rates that are softer than OEM and transfer a large amount of roll stiffness to the front, meaning they will increase understeer.
Tein H-tech for G35 Sedan (SKP14-BUB00)
F/R Progressive - spring rates listed rates are final rates
324/263
F drop –1.4”
R drop –0.7”
Tein H-tech for G35 Sedan front to rear spring rate balance vs. OEM balance
-7% front / -35% rear (28% transfer to front)
Here is a bunch of spring rate, sway bar, coilover etc. info I copied a while back from a post by Gsedan35 worthy of reposting:
Quote:
Stock Coupe 6MT Spring rates are the same rate as the 350Z spring and the sedan with the sport suspension.
314/342
Here are the spring rates in comparision to all known lowering spring/coilover product made for the Z33/CPV35/V35. If a product is not listed, that maker refused to give out the info.
Eibach's as noted (first number is the softer initial rate, followed by the higher final rate)
350Z 296/384 front 316/421 rear
G35c 229/337 front 274/463 rear
G35s 259/334 front 359/413 rear
RSR 350Z springs (just a wee bit progressive F&R, maybe one coil is progressive)
345/417 F+10% R+22%
Transfers +12% roll stiffness to rear
RSR G35 coupe springs (progressive front and rear)
315/315 F+0 R-8%
Transfers +8% roll stiffness to front
Hotchkis 350Z springs (linear springs)
340/330 F+8% R-3%
Transfers +12% roll stiffness to front
Tein S-tech 350z (fronts are progressive, rears are linear)
386/402 F+23% R+16%
Transfers +7% roll stiffness to front
Tein H-tech 350z (fronts are progressive, rears are linear)
358/375 F+14% R+11%
Transfers +3% roll stiffness to front
Tein H-tech G35 coupe & sedan(fronts are progressive, rears are linear)
324/260 F+ 5% R-22%
Transfers +27% roll stiffness to front
Tein S-tech G35 coupe & sedan (fronts are progressive, rears are linear)
358/274 R+14% R-18%
Transfers +32% roll stiffness to front
Tanabe GF210 Series 350Z
336/375 F+7% R+10%
Transfers +3% roll stiffness to rear
Tanabe NF210 Series 350Z
314/353 F+0 R+3%
Transfers +3% roll stiffness to rear
Tanabe NF210 Springs G35 COUPE
297/336 F-5% R-2%
Transfers +3% roll stiffness to front
Tanabe DF210 Springs G35 COUPE
308/353 F-2% R+3%
Transfers +5% roll stiffness to front
Tanabe NF210 Springs G35 SEDAN
297/269 F-5% R-21%
Transfers 17% roll stiffness to front
Tanabe DF210 Springs G35 SEDAN
286/280 F-9% R-18%
Transfers +9 roll stiffness to rear
Kg/mm springs 350Z
DR21 super sport 15mm drop
246/398 front 252/409 rear
Kg/mm springs 350Z
DRacing 30mm drop
252/454 front 252/482 rear
Espelir coupe springs (the U.S. importer recently changed specs, I do not believe the newly listed specs are correct, since the new one's are extreamly high. And when I called the company to ask if the springs are linear or progressive, they told me Linear, turn's out they were absolutley wrong, they are in fact progressive. I show the old specs for those reasons, take it with a grain of salt, same thing for the 350Z fitment)
409/460F F+30% R+37%
Transfers +7% roll stiffness to rear
Espelir 350Z springs
381/460 F+22% R+37%
Transfers +15% roll stiffness to rear
Tein Flex
672/672 F+114% R+98
Transfers +16% roll stiffness to front
Tein Flex JDM specs (can be special ordered est 6-8 weeks delivery)
560/560 F+78% R+64%
Transfers 14% roll stiffness to front
Tein Basic
504/504 F+61% R+43%
Transfers +18% roll stiffness to front
Tein CS (Monotube)
392/392 F+25% R15%
Transfers +10% roll stiffness to front
Nismo S-tune (uses progressive springs, especially in rear)
350Z/G35 Coupe
448/504 F+43% R+48%
Transfers +5% roll stiffness to rear
Nismo S-tune (uses progressive springs)
G35 Sedan
347/342 F+10% R+0%
Transfers 10% roll stiffness to front
Buddy Club Racing Spec coilover (Monotube)
748/280*
(very likely run's rear springs on the dampner body and not at the oem rear spring location)
Jic Flta-2 350Z fitment (Monotube)
560/672 F+78% R+98%
Transfers +20% roll stiffness to rear
Jic Flta-2 G35 coupe (Monotube)
560/560 F+78% R+64% $1750
Transfers 14% roll stiffness to front
Jic Flta-2 G35 sedan (Monotube)
504/392 F+61% R+15%
Transfers +46% roll stiffness to front
Cusco Zero 1&2
560/392 F+78% R+15%
Transfers +63% roll stiffness to front (no they do not run their rear springs on the dampner body, oem location, seen them on the car with my own eyes.)
HKS LS+ (rear springs are progressive)
496/440 +58%front +29%rear
transfers 29% roll stiffness to the front
HKS LS G35
448/336 43%front -1%
transfers 44% roll stiffness to the front
HKS LS 350z
448/448 43%front +31%
transfers 12% roll stiffness to the front
HKS II 504/504 +61%front +47%rear $1600
transfers 14% roll stiffness to the front
KW coilovers Variant's 1,2&3
Variant 3's are noteworthy as the only known coilover for these cars where the dampners are adjustable for compression and rebound independently. They also differ in using progressive springs front and rear
Front: 485lbs to 525Lbs Rear: 240Lbs to 548Lbs
D2 Racing Coilovers (Monotube)
840/728 F+168% R+113% (wee bit stiff eh, the recommended rate to)
Transfers 55% roll stiffness to front
Basically the increased roll stiffness to the front of the vehicle will add more understeer. The percentages which are positive will have a more harsh or more stiff ride than stock. Negative numbers will be softer. The farther away the spring rates get from zero, the faster the stock shocks will wear out (unless you are considering coilovers).
As you might notice, the Tein H-Techs for the 350Z add the least amount of additional understeer (w/o adding to oversteer) keep the springs rates closest to stock, allow a 0.8" drop in the front and a 0.7" drop in the back for a G35 coupe and a drop of 0.3" in the front and 0.2" drop in the back for a 350Z. They also should not wear out the stock shocks too fast as the spring rates are mildly more stiff than stock, yet you get a nice subtile drop. By adding to a coupe, you should stay within the stock camber and toe ranges, thus not having to add camber/control arms and toe bolts.
When calculating drop for a sedan, you can use the drop of a coupe +7/8". IIRC, 7/8" is the diff between the spring height of G coupe and sedan but I'm sure someone will correrct me if I'm wrong.
Wow, great post (and repost) dh... thanks! I'll have to look into this some more since I don't want to change to an understeer scenario. I like the balance I have now with the ability to drift the car when desired.
It is almost a given that, if you are lucky enough to find the spring height that gives you the drop you want, it will not be the perfect f/r spring rate balance. Therefore, after installing the new springs, you will most likely want adjustable anti-sway bars to get handling fine-tuned back to your liking. IMO, you should just plan on adding sways too if you intend to do the job right.
how do you know so much dholly?! (wide eyed smiley)
different springs place different strains on the rest of your suspension. So if I take H techs, and put them on my X, my front suspension (which is different from the RWD model) will wear out in a different manner than my rear (which is the same as the RWD).
I am just trying to figure out why there is no AWD suspension, and if it would be dangerous to get the rwd for the awd
__________________
:05X: f/s
Neal 376 [8:31 P.M.]: sedan drivers are better
superbitch [8:31 P.M.]: i agree with you
Neal - look at our join dates. I have a two year jump start on you when it comes G research is all. Since both my sedans were 6mt's, I haven't saved info on the awd. Sorry.
thx; you DRIFT your G? Brother you are asking for it! I wonder why anyone would want to modify the suspension on the G since the thing corners as if on rails anyhow! I guess I am just used to the stock setup and do not want to give up ride quality for even better handling. Maybe bigger swaybars in the future....
Wow, great post (and repost) dh... thanks! I'll have to look into this some more since I don't want to change to an understeer scenario. I like the balance I have now with the ability to drift the car when desired.
Amen Brother! Have a lil' fun. What year is your 5at sedan? My assessment is that Coupes normally understeer (front push), while Sedans normally oversteer (tail out). However, IMO, sedans with sport suspension exibit different handling characteristics at the limit than non-sport equipped sedans. My 6mt sport sedan understeers at the limit, and only oversteers with changes in pedal input, brake or throttle. On the other hand, non-sport sedans seem to oversteer much more easily, i.e., the rear comes out first and will continue to come out until momentum can be canceled via scrubbing off speed. Also, I think whether your sedan has LSD or not effects this behaviour to some degree (I could snap the ass end of my '03.5 6mt sedan out with throttle input at the limit much easier than I can with my '04). This was, of course, before aftermarket sways although I've tried to keep the same balance with my new settings. Hey, I too like a little tail now and then...
Woohoo! Nothing better than laying into the throttle in 2nd doing about 40mph around a 90 degree turn. I've done it with a lot of cars, but none better balanced or in control that the G at speed. I think the more research I do, the more satisfied I am with the stock sport package. Don't want to mess it up. Btw dh, mine is an '05.
Mike, it's my version of drifting, but no I don't do the crazytime 90mph 300' long drifts like the pros do. Growing up in the country with lotsa dirt roads let me learn to steer with the throttle.
Eibach or Tein H-Tech - Opinions?
Since both my sedans were 6mt's, I haven't saved info on the awd. Sorry.
