Hey guys I'm in the process of buying some springs for my G35 to lower it about an inch, and I cannot seem to find the answer to my question about spring rates for the G35 Tein springs. Are the rear load rates going to be much softer than stock suspension rates, or are they going to be the same? I contacted Tein and this is response I received.

"Thank you for your interest in TEIN products. Our lowering spring kits
utilize a progressive design in that some coils are used purely to seat the
springs onto the assemblies, but function in a linear capacity once
installed.

As such, only one spring rate is provided. The High.Tech kit includes the
noted 325 lb. front springs with 263 lb. springs for the rear. From the
data we gathered at the time of testing, these rates are more aggressive
than the stock components.

For reference, all TEIN products are designed and tested in each of the
markets they are sold in to insure proper fitment and performance. The main
gain with use of our spring kits is aesthetic, in that a lower stance is
provided. For those seeking more performance oriented designs, our coilover
kits are recommended.

Use of the springs from the 350Z is not recommended as the spring design and
rates are not appropriate for your vehicle. To obtain the desired one inch
drop front and rear, our S.Tech kit (part # SKP30-AUB00) would be
recommended as it provides -1.2" drop for the front and -0.9" lowering for
the rear."

Does this mean that the load rates are going to be much softer? I do not want a soft suspension in the rear. If so, I'd be better going off with the 350z Tein springs. Also, is there another spring similar to Tein that anyone would recommend? I'm looking to lower my car as low as possible (about an inch) without eating tires. I'm willing to buy a rear camber kit if it's a must.

Thanks.

 

Sticky from this forum:

https://g35driver.com/forums/brakes-...w-updates.html

Lower spring rate = less stiff (it takes less pressure to compress the spring).

 

Springs which are offset from the hub and wheel centerline confuse many inthat they are multiples of the actual wheel spring rate.

The tires and wheels [which are very very stiff] are in series with the coil springs [so are all the rubber seats and bushings THUS the real wheel rate is significantly softer than the published spring rate.

Engineers calculate the REAL wheel spring rate so that the spring ratio equals the body weight ratio. If the body weight is 54% front then the front springs together need to be 54%.

 

Thanks for the reply. So are you saying that the advertised rear spring rate of 263 lbs/in (real wheel rate) would be only 54% of the actual "spring ratio" (aka published spring rate) or that the advertised 263 lbs/in is the actual spring ratio (published rate) so the spring rate is less than 263 lbs/in?

 

Okay I'm curious what the response is to Sgrice's question as well. Q45tech....please enlighten us.

I'm on the hunt for some coilovers or good spring setup myself