Hi everyone! First post, but i've been lurking for quite a while. This here will be my review on a new suspension system recently released by Tein called the Basis Z. They are basically the same as the Tein Basis, except these are now sealed units which are not rebuildable and cost is cut significantly. I purchased my set of suspension for under $500 shipped to my door. I will break this review down into different sections in order to keep things clear and prevent clutter. Alright, here we go.
-2006 G35 Coupe 6MT.
Very standard. Everything came neatly packaged in cardboard. No parts were scratched or missing. Nothing out of the ordinary. Came with spanners needed for height adjustment and also a simple instruction booklet thing which shows you which order the struts should be assembled in.
Install was fairly straight forward. I have never installed suspension before, but after reading a few DIY here I had it figured out. Since this isn't a DIY thread, I'll just leave it at that.
NOTE: For the install, I did NOT use camber arms as most people on here like to recommend. I am not into slamming my car, my goal was to have reduced roll under cornering and better damping than OEM suspension. My alignment shop was able to get me close to the specs I wanted even without arms. My car height rested at 27" from ground to top of my wheel arch all around.
Here I will break it down into two subcategories under street and track. My G is my only car and I put 400+ miles per week on it commuting to work (80 mile round trip 5 days a week). Weekends consist of carving around some south bay backroads in the santa cruz mountains.
I found the car to be very compliant in the street and the ride quality is not harsh AT ALL. The suspension allows the driver to feel the road and its imperfections without having any "crashing" feeling while hitting bumps or even potholes. After installing the suspension, there was significantly reduced nose dive/lift during acceleration and braking. That translated to better response for daily driving and also improved throttle inputs/ adjustments during spirited driving. Steering response improved and was much sharper on turn in compared to the OEM sport suspension. This is most likely due to the increased front spring rate. These dampers work surprisingly well for this price range. While hitting large bumps at high speed on the freeway, the suspension has no oscillation or as most people like to call it "bounce". All in all, the Tein street basis Z is VERY good for street cars looking for a bump in performance on a budget.
I took the car up to Thunderhill Raceway this past weekend and had a blast. It was my first time EVER driving out on a track and it gave me a chance to finally test the suspension at a higher limit than I ever could on the street. As expected, these shocks are on the soft side for track duty. Body began to roll much more than I would prefer on track, however the predictability was still there. Mid corner steering inputs were immediate and precise. Having the suspension reduce nose dive increases confidence in the braking zone and allows me to have more precise pedal modulation versus a front end that dove hard. To sum this up, if you are looking for a track oriented suspension, you should go elsewhere. Best lap time was a 2'26" CCW-Bypass for those who may be curious.
Alignment and Setup
My car was running on continental contisport contact tires in the rear with Pirelli Pzero in the front in OEM sizes. Car was pretty balanced at the track with tad bits of understeer when I overwork the front tires (my fault for having shitty tires).
Toe: 0.05 inch toe in
27" all around from ground to top of wheel arch
This was achieved with SPC toe/camber bolts on BOTH the camber arm and the spring bucket. Yes, I had to dremel out the subframe to enlarge the hole. Part # is SPC 72055 for both and you need 2 kits with a total of 4 bolts.
Thanks for reading. Hope this helps anyone who may be looking to purchase suspension or may be considering the Tein Basis Z. Also feel free to PM me regarding alignment issues. I've done a ton of research on both Z and G forums before buying everything that I needed. I'd be more than happy to help.