Well I installed my tein basics because i wanted to improve the handling of my car and also visual appeal by lowering it a little more than my hotchkis springs did. So have the install it was very low but looked great! after many adjustments i have it a a good height maybe only 1/4 lower than hotchkis springs where. but i have a big problem, the front driver side wheel under hard cornering hit the top of the wheel well at starts to lock up, like if the ABS kicked in, i took the wheel off and you can see where it hits its actually cut threw the plastic fender wells. My wheels are 20x9.5 245/40/20 and 20x11 in the rear 275/35/20 is there an adjustment for the bump stops or something i can do ? it really sucks because i cant take corners with condifence any more. I also have hotchkis sways and tires are Yokohama AVS Sport

Thanks again and help is GREATLY appreciated!

 

Dude man, with 20's, you're bound to have rubbing issues if you drop your car. Maybe you might have to preload your springs, then higher the car using the threaded shock body to make it a bit stiffer, so it won't dip down as much...

 

yea, you dropped it way too low for 20s i was going for 20s but 19 is whats gonna be on my car with tein basic
hope you get this issue fixed

 

The basics only have adjustment for height by preloading the spring... so the only way to make it stiffer is to make the car higher, basically even when i set it at the same ride hieght as my hotchkis springs it still hits, and it doesnt just rub a little. it actually slows down/ stops the wheel. right now im thinking of a way to make the shock bump stop about .5 in to 1in thicker any idea?

 

245/40-20 = 27.7" overall diameter
225/45-18 = 25.8" overall diameter
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Their is the source of your problem. A 2" taller tire translates into a 1" loss of tire to fender lining clearance. Componding things is the fact that those taller tires increase the height of the vehicle compelling your to want to drop the vehicle more, a no win situation. Since it's not really viable to ask you to kick the rims and tires to the curb. I see 2 choices. Either add ride height or dive into the front fenders with a eye into slicing and dicing additional liner to tire clearances. But that brings up the issue of exposing the inner fender area's to the elements.

I would not recommend to try and use modified bump stops as a means to fix the problem. Increasing the bump stop height and getting them to limit wheel travel means that once the suspension encounter's them, mean spring rate suddenly spikes. Not what you want to happen when your getting to or at the limit of adheasion. If you must, Koni makes a line of bump stops, even some that are feature soft/progressive. I recently switched to the soft progressive stops myself. They're not easy to cut for trimming their height I'll tell you that. http://www.truechoicekoniracingservi...eb_Catalog.pdf
Go to PDF page 11

 

you forgot the third option: get new tires that actually fit :P

 

I didn't forget. Sticking with the notion that the Z is a sports car and granted going narrower on tread width's may offer up some choices, the car deserves 245mm front tread widths at the minimum.

245/30-20 = Conti sport contact2, Pzero Nero, or KDW2

It would mean he'd have to go with contact2's in order to stick with 275's in the rear. IMO not a great tire to end up with. And the Nero's are simply not made in a rear size that will make things work.

 

stiff sway bars

 

i wasn't thinking of getting narrower tires, i was thinking of getting lower profiles tires. A 40 profile tire is simply too tall to work for 20s on the Z. I mean everyone here is running 35 profile on 19s!

And at 20", it's not like he's looking for ultra performance (i would assume), there are plenty of people around the forums that are running 20s and using the correct tire sizes, so I would think this is a much simplier solution than something drastic like slicing your lining.

 

reread his first post on the performance issue.

Actually looking even deeper into 30 series 245 20's adding in "ultra high performance", "high performance" even "ultra high performance all-season" tires doesn't solve his problem since nothing is avaliable. Closest is Falken ST-115's in 35 series even then he net's a .5" increase in tire to liner clearance.

 

245/40/20>!>!>!>!>!>

Thats a truck tire!

you need 245/35/20 / 275/35/20 or 275/30/20

 

what about 19's with a 35 is there any tires that you guys do NOT recommend? also dropped with basics

 

245/35/19 is fine up front
255/35/19 is getting too tall if you ask me... others do it, i dont recomend it...