MJH91RS

I've done a search, but I could only find spring rates for Z28 and RS(without F41 package) Im redoing my suspension and I was wondering whether or not to keep the stock springs. If the spring rates are pretty close to the Z28 or IROC, I will keep them. Otherwise, I will replace them.

I have a 91RS with the F41 suspension. I am currently upgrading all bushings to polyurethane, sway bars to 36/24, new struts/shocks, wonderbar, and all the steering components. The only part im not really touching are the springs. I'm starting to think maybe I should, but I was reading some people suggest keeping the RS springs with the F41.

Any suggestions??

sully91rs

I also have a 91RS with F41. I'm keeping my stock springs. Searching for MOOG replacements yeilded v6 rs springs, rs springs, and z28 springs. I believe the rs came at around 4xx lb/in and the z28 was 7xx lb/in. I feel my car handles great and rides very comfortably. I drove a 91 z28 before, very rough. Its felt like I was riding on rims with no springs .
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Front Heavy Duty Coil Springs
Z28 - COUPE
& CONVERTIBLE
Part Number 5662
Inside Diameter 4.085
End Type 1 Square
End Type 2 Tangential
Bar Diameter 0.750
Install Height 10.75
Load in Pounds 1690.0
Spring Rate 748.0
Free Height 13.01

Front Heavy Duty Coil Springs
RS
COUPE
Part Number 5610
Inside Diameter 4.080
End Type 1 Square
End Type 2 Tangential
Bar Diameter 0.687
Install Height 11.00
Load in Pounds 1750.0
Spring Rate 424.0
Free Height 15.19

This is info from Moog parts lookup. I'm not sure if F41 got the z28 springs or the rs springs.

yjischoking

iTrader: (3)

i also have the f41 that came w/ the heritage package on my RS. im pretty sure they are just v8 RS springs because i just measured the ones sitting in the garage and free height is at 15.5 inches or so. so yah get some better ones...like eibach or stock IROCs

MJH91RS

Yeah, I always thought that the F41 meant it got Z28 springs.

Is there anyone who is absolutely certain on the answer to this?

yjischoking

iTrader: (3)

i dont see how you can be anymore certain. my rpo list says F41 and it is an RS. I pulled my stock springs out of my own car that was bone stock suspension-wise when i bought it. Then I myself measured them and saw with my own two eyes that they were 15.25 inches or so uncompressed. That's pretty solid evidence for me.

MJH91RS

After many searches and a lot of reading, I have decided to keep the springs I have for now. There seems to be mixed opinions on the F41 springs, so I might as well try them out.

sully91rs

Thats also a nice way to save yourself $200 .