The NEW ARK GT-S 350 LOWERING SPRINGS!
02-24-2012, 08:05 AM
#24
You couldn't have done R&D on 03/04 oem shocks with these springs. I've tested them with spring rates close to what you've got here and the resulting ride quality was horrible. I made one freeway commute and pulled the setup fast, no biggie I knew in advance it wasn't likely going to work out.
The Z (excluding the Nismo version) has used 3 different oem shocks in it's lifetime
2003/2004 (with 314/342 spring rates)
2004.5/2005 (revised to improve ride quality, spring rates 314/427)
2006/2008 (differant part numbers, Nissan has never said anything publicly to explain why they changed, spring rates 314/427).
IMO the 03/04 shocks are out of the question to run with the spring rate's your people have come up with. All the other years may be ok, biggest concern is the 100lbs jump in spring rate in the front vs oem. I too would really recommend these springs with Tokico D-spec shocks.
I do have one question/request.
When the springs come out, can you please post a picture of the actual springs your selling for the car, vs a generic picture?
02-26-2012, 12:39 PM
#26
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This might be the last new spring set manufactured for the Z. Would be nice to have a 0.75-1.00 100% linear drop spring with sportier rates to match sportier shocks.
02-29-2012, 07:52 AM
#27
Found a picture on ARK's web site of their 350Z lowering spring, so we can answer the question are they linear or progressive.
Rear springs are linear (the two in the center of the picture)
The front springs (far left and far right), do look slightly progressive. I say slightly, because I think that only 1 coil would bind in use at the most. Assuming that one coil does bind, it would only slightly effect spring rate when it does, vs a spring where say, 2 or 3 coils that bind. So I estimate the following numbers.
Ark GT-F 350Z lowering spring .8"/.6" drop Slightly progressive front, linear rear
Spring rates in LBS initial/final Front 420/470 Rear 460
So, normally I do not recommend progressive springs on a sports car that is likely to be driven like one. When the springs are only slightly progressive, the rate differance is too small to worry about. Still going to recommend D-spec or Koni shocks only though.
Rear springs are linear (the two in the center of the picture)
The front springs (far left and far right), do look slightly progressive. I say slightly, because I think that only 1 coil would bind in use at the most. Assuming that one coil does bind, it would only slightly effect spring rate when it does, vs a spring where say, 2 or 3 coils that bind. So I estimate the following numbers.
Ark GT-F 350Z lowering spring .8"/.6" drop Slightly progressive front, linear rear
Spring rates in LBS initial/final Front 420/470 Rear 460
So, normally I do not recommend progressive springs on a sports car that is likely to be driven like one. When the springs are only slightly progressive, the rate differance is too small to worry about. Still going to recommend D-spec or Koni shocks only though.
03-04-2012, 08:24 AM
#32
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05-15-2012, 08:51 AM
#35
I'm a bit confused. Isn't the GT-S a lower drop than the GT-F?
In the first post you list the drop as:
- Front / Rear :-20mm/-15mm
Aren't those the GT-F spring specs?
Can you clarify this as well as verify the spring rates for each application?
In the first post you list the drop as:
- Front / Rear :-20mm/-15mm
Aren't those the GT-F spring specs?
Can you clarify this as well as verify the spring rates for each application?
Last edited by AllstarE4; 05-15-2012 at 01:15 PM.
05-15-2012, 12:29 PM
#36
Spring rates in LBS initial/final Front 420/470 Rear 460
Those look like great springs as far as rates go. Better than Nismo S tune springs In my opinion. If I wanted a modest drop that would be the ticket...with the right shocks.
FYI..I have Nismo S tune with 448 Front (prog max) and swapped out the REARS (508 Prog max) to Eibach Prokits (421 Prog max)...keeping Nismo shocks of course... and it's friggin' fantastic! So, this Ark set up should be killer on good shocks.
05-19-2012, 09:53 PM
#40
edit: I figured out that what I was thinking of was the two different coilover options... DT-P and ST-P. There is only one drop spring, the GT-F. So is ARK advertising the same spring as two different model names?
Last edited by AllstarE4; 05-19-2012 at 09:58 PM.