Riddle of the ride height and the devil's wheel gap.
#1
Registered User
Thread Starter
![Default](https://my350z.com/forum/images/icons/icon1.gif)
Breaking my vow of never posting for this one. Car and myself went through a few mid-life/indentity crisisis this year and I have an unattractive mess on my hands.
So...
S-tune suspension
+
275/40/17 X 4
=
Livable front/ jacked up (literally) rear.
I can't figure out why its that high and the math is giving me headaches.
Its sitting pretty much at stock ride height 26.4/27.5 (spec is 26.81/27.56).
The tires are 25.7 overall diameter uninstalled 25.ish on the wheels.
Stock tires are 25.9/26.3 uninstalled; not sure about mounted.
At this point I'm probably going to get SLP mid-links+camber arms/swift springs matched to the front rate and drive it till tax time and then finish with __?___ coil-overs and the rest of the SLP goodness.
Any insights/temporary solutions/commiseration/flaming/joking/etc is welcome.
So...
S-tune suspension
+
275/40/17 X 4
=
Livable front/ jacked up (literally) rear.
I can't figure out why its that high and the math is giving me headaches.
Its sitting pretty much at stock ride height 26.4/27.5 (spec is 26.81/27.56).
The tires are 25.7 overall diameter uninstalled 25.ish on the wheels.
Stock tires are 25.9/26.3 uninstalled; not sure about mounted.
At this point I'm probably going to get SLP mid-links+camber arms/swift springs matched to the front rate and drive it till tax time and then finish with __?___ coil-overs and the rest of the SLP goodness.
Any insights/temporary solutions/commiseration/flaming/joking/etc is welcome.
#4
Registered User
iTrader: (9)
![Default](https://my350z.com/forum/images/icons/icon1.gif)
It is an optical illusion because your tires are same diameter all around. Its filling more than stock gap in the front, and less than normal/stock in rear. It just appears higher in the rear.
Springmount mod for temp fix of the rear. take 1/2 to 3/4" off the mount. Dont waste money on swift springs and just wait for coils.
Change front tires to smaller diameter for perm fix after coils.
Springmount mod for temp fix of the rear. take 1/2 to 3/4" off the mount. Dont waste money on swift springs and just wait for coils.
Change front tires to smaller diameter for perm fix after coils.
Trending Topics
#14
Super Moderator
MY350Z.COM
MY350Z.COM
![](https://my350z.com/forum/images/ranks/premier.gif)
![](https://my350z.com/forum/images/ranks/moderator.gif)
iTrader: (8)
![Default](https://my350z.com/forum/images/icons/icon1.gif)
Throw 275/40-18's on the rear and the illusion will go away. It will also handle real well.
#15
Registered User
iTrader: (1)
![Default](https://my350z.com/forum/images/icons/icon1.gif)
A couple times at Cal Speedway and WSIR I had 350Z guys come by and tell me my car was sitting too high and that I needed to lower it to make it handle better.
![](https://my350z.com/forum/members/betamotorsports-albums-my-350z-picture5407-right-after-a-track-event-11-2008.jpg)
They still said the same thing after I ran laps 6 to 9 seconds faster then them and their lowered cars. BTW... in that picture the car is running 285/30-18s all around on stock springs.
![](https://my350z.com/forum/members/betamotorsports-albums-my-350z-picture5407-right-after-a-track-event-11-2008.jpg)
They still said the same thing after I ran laps 6 to 9 seconds faster then them and their lowered cars. BTW... in that picture the car is running 285/30-18s all around on stock springs.
#17
Registered User
Thread Starter
![Default](https://my350z.com/forum/images/icons/icon1.gif)
Took driver's side apart, no 1" block of wood under spring like I was hoping.
Almost cut the mounts but didn't have a precise way of doing it. Also it seems ghetto.
Can someone measure a stock 17" with 235/50 overall diameter for me?
This is so I can compare what my theoretical S-tune+stock wheel tire gap is to pictures of other S-tune/stock gaps.
Almost cut the mounts but didn't have a precise way of doing it. Also it seems ghetto.
Can someone measure a stock 17" with 235/50 overall diameter for me?
This is so I can compare what my theoretical S-tune+stock wheel tire gap is to pictures of other S-tune/stock gaps.
#18
Super Moderator
MY350Z.COM
MY350Z.COM
![](https://my350z.com/forum/images/ranks/premier.gif)
![](https://my350z.com/forum/images/ranks/moderator.gif)
iTrader: (8)
#19
Registered User
Thread Starter
![Default](https://my350z.com/forum/images/icons/icon1.gif)
That's uninstalled/no weight on it. The 275/40/17s I have are listed at 25.7 total diameter. On the car they are just over 25. So the stock tires are 26.3; I'm assuming they compress similar to about 25.7...so I gain .6ish wheel gap. Right now it does need gas but I measure at:
Front 26.25 with 1.5 gap.
Rear 27.75 with 2.75 gap.
The ride height does not make sense. It should be -.8 from the springs and -.35 from the sidewall reduction.
Front 26.25 with 1.5 gap.
Rear 27.75 with 2.75 gap.
The ride height does not make sense. It should be -.8 from the springs and -.35 from the sidewall reduction.
#20
Registered User
Join Date: Jan 2008
Location: Houston Tx
Posts: 328
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://my350z.com/forum/images/icons/icon1.gif)
When I swapped from my 255/35/19's front, 285/35/19's rear to 255/40/17 all around (Before I dropped it and had it realigned) I looked liked I was driving a 4-wheel drive 3/4 ton Z.
Last edited by BrazenZ; 11-13-2010 at 01:26 AM.