I have been reading the Z/28 section tonight in hopes of getting pointers about mods the Z/28 suspension might require, but could not find anything. Actually, there is very little information available in terms of track performance and feedback outside of magazine reviews.
Do any of you guys know about Z/28 suspension?
- Would it substantially benefit from camber plates?
- How are the sway bars? Z/28 suspension kit comes with much smaller sways, which is great if the shocks are stiff enough to reduce body movement. Let's dive into this a bit more...
Z/28 sways vs. 1LE sways vs. BMR sways- Z/28: Fronts solid 25mm, rears solid 26 mm.
- 1LE: Fronts soild 28mm, rears sold 27 mm.
- BMR: Fronts hollow 29mm, rears hollow 32mm; both adjustable.
From BMR site:
Quote:
FRONT
Hole 1 (Boot-Leg end of bracket) 98% stiffer than OE bar
Hole 2 (Center) 146% stiffer than OE bar
Hole 3 (Flat end of bracket) 214% stiffer than OE bar
REAR
OE SS bar (FE4)
-Hole number 1 provides just over 100% increase in rate over the factory FE4 bar
-Hole number 2 is 150%
-Hole number 3 is 200%
OE ZL1 bar (FE5)
-Hole number 1 provides just over 25% increase in rate over the factory FE4 bar
-Hole number 2 is 40%
-Hole number 3 is 75%
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The question: If you were me, would you use the BMR sways (already installed), or use the Z/28 sways that come with the package? I still have the OEM 1LE sways, too.
I have always been against stiff sway bars since they reduce traction when they are used to reduce the body roll caused by springs/struts that are too soft for the application. FYI, the Z/28 springs are %85 stiffer at the front, and %65 at the rear. I like the adjustability of the BMR sways, but they might be too stiff even at their softest. They were much lighter than stock bars due to having hollow construction, though, which was great!
Source for Z/28 specs: GM bulletin:
http://media.gm.com/media/us/en/gm/h.../0217-z28.html