After hours of calculation I have found my desired suspension setup.

Espelir springs in the front with Koni yellows (would prefer an adjustable mono-tube), and revised OEM with cut down seats in the rear with Bilstein B6 shocks.

I know the Espelir are progressive but it's the only spring with the rate I want with the least amount of drop. What is the model with the 386 lbs/in front spring rate? The Espelir GT... The red ones?

 

call a vendor

 

I did. They can't confirm the spring rate.

 

from g35 driver

 

https://my350z.com/forum/brakes-and-...active-gt.html

 

I have had the Espelir Active GT springs and Tokico D-Spec shocks on now for 10 years.
I have never thought about changing. I was concerned about being too low but it wasn't that bad. Handling, ride, longevity, I couldn't ask for more - for a daily driver.

Depends what you want. Do a search, there is data on this board that goes way back.

Just saw that review Travlee posted above. I had zero problems with alignment etc. My buddy was a tech at Infinity at the time and he did the first alignment after I installed them, it was a bit close he said but all good. I never had uneven tire wear and trust me I went through many sets of tires in the last ten years. If I remember correctly my son measured before the change and after, not scientific of course, and I think it was pretty close to what they stated, they said .4" and I think it was .45 or so.

Forgot this too, he measured only at the front, so I don't know about the back as far as lowering. I wouldn't want to go any lower in the front, that is for sure. Just replaced my under engine cover, my Nismo lip needs new plastic rivets very soon, not too much head left on them.

 

I've read all those before. They don't state what model.

That's what I want. As I said I'm only wanting the fronts and going with OEM revised rears. I could go with S-techs too but the lower drop will require more messing around with ride height. With the Espelir I can either cut the rear seats 10mm or shim the front 10mm

 

i had the s-techs for a while, didnt need anything to be in spec for alignment... but every car is a little different.

 

I’m running Tein S-Tech springs now, and my experience is the same that Travlee describes. I didn’t need to change any suspension components to be within alignment specifications.

• Tein S-Tech Springs (two front and two rear)
• Part Number: SKP26-AUB00
• Spring Rate (kgf/mm, lbs/in): Front: 6.9/386 Rear: 7.2/402
• Drop: Front: -17mm (-0.7”) Rear: -14mm (-0.6’)

The S-Tech springs are very similar to the Nismo street kit springs (not to be confused with the Nissan Nismo 350z model). The S-Tech’s are a little “bouncy.”

Here is a thread describing the S-Tech and the need for aftermarket suspension changes when dropping the car.

https://my350z.com/forum/brakes-and-...coil-over.html

 

Still leaning toward Espelir. Not worried about alignment. It's all ride height and ground clearance where I live. The roads are crap. I will sacrifice center of gravity for less wear any day.

My wheel set-up is going to be down the same lines. 255/45-17s in the front and 275/40-18 in the rear. It sucks I can't get Michelin PSS tires in the front size, I'll have to settle for Contintal Extreme Contact DWs.

Luckily I can get TE37s in 17x9.5 +28 and 18x10 +30s.

 

Why not just get 18s on all corners?

 

Most sidewall as possible

 

Sell z, buy a truck.

 

I get why you want 17” front and 18” rear wheel diameters. It will look fine (about the same sidewall height front and rear), and the ride is better without sacrificing handling. You will like the Continental Extreme Contact DW’s. They are very quiet (for a summer performance tire), wear well, and provide good handling.

The wheel offsets you are considering will look a little “tucked-in.”

 

I'm sticking religiously to the stock offset. I won't divert too far from the front offset of +30 because of bump-steer. I could live with +28. Looking "tucked-in" isn't too much of a concern.

 

You make a good point and are wise to be concerned about bump-steer.

With that said, You don't need to worry about bump-steer if your car remains within manufacturer specifications. The 350z does this if you do not drop the car more than 3/4" (some would say 1/2") and keep less than 15mm offset with 9.5" wheels on the front.