I currently have Tein S-Tech for the 350Z with springs rates of 385 f and 402 r and Tokico D-Spec for the 350Z on my 2003 6mt Coupe. I love this setup! However, I just added a Vortec, which adds about 80 lbs on my extreme front end. A once perfect 1.2" drop up front is now unbearable. I scrape my front end bottom quite a bit. I can't even get up on most drive on ramps. They have to back my car in just to do an oil change. I know it's just a matter of time before I do some damage. I have a fuel pump, FMU and tee'd fuel lines up front I'm worried about damaging. I need to raise my car about .5 to .75" up front, but keep a similar spring rate. The only choice I see is the longer Tein H-Tech for the 350Z, which will give me about a .75 to 1" drop up front, but the front spring rate is only 358. This results in a roll stiffness to front from +7% with the S-Tech to -2% with the H-Techs (+14%-(+16%)=-2%). I'm not sure if a negative roll stiffness is a good thing or not.

Please analyze my case and offer your input. I'm not totally against changing out the whole system for a coilover or different springs, but of course I want to go with the least expensive option. Did I mention that I love my D-specs?

 

Ouch man that is a hard one, I can't help good luck!

 

Wow . . . That's waaaay over my head. However, if you do decide on the Z H-Techs. I found a sponsor selling them for $135.00 shipped.

 

^Where?

Dean...it might be time for coilovers.

 

Deang35c6

I love coilovers, Maybe......find a set of used 05 stock coupe frt coils. Should give you about a 1" drop or more.

 

if u get the H-tech, can't u just adjust your d-specs to a stiffer setting??

 

sry to hijack but i wnt to get D-specs with 350z h-techs for my 06 coupe with OEM 19's...Do i get the G35 D-specs with 350z h-techs or the 350Z D-specs with 350zh-techs...how much of a drop should i expect?

 

+1, sounds like that may be your only option.

 

ya i would look into coilovers... the fact that you just bought the SC... i can understand if your tight on money

 

From one of our very own sponsors . . . JSC Speed Inc. PM Kyle at JSCspeed.

 

2005 coils won't do. Their 314 spring rate too. I need at least 375 spring rate up front and a drop of 1" on the G Coupe or .4 drop on the 350Z. I did increase the damping on the front D-specs, but this does nothing for the actual drop. Guys, I'm trying to lift the car about .5 to .75".

 

get 350 H-techs and change the damp to ur preferance