Spring Rates, Coupe vs. Convertible
Thread Starter
Instructor
Joined: Jun 2006
Posts: 110
Likes: 2
From: SnoCo, WA
Spring Rates, Coupe vs. Convertible
Let me start by saying Kudos to those whom have made these spring charts, Hib et al.
I do have one question, something that doesn't make a lot of sense to me. I posted this question the followng thread here but was a bit off topic.
Below is the listings, converted to lb/ft from N/mm, for the 1996 C4....
Front Rear
CPE(Y07)
FE1 342.6 148.46(RHZ)
FE1/Z16 342.6 148.46(RHZ)
F45 342.6 148.46(RHZ)
F45/Z16 342.6 148.46(RHZ)
Z51 417.972 188.43(RHY)
Z51/Z16 417.972 188.43(RHY)
CNV(Y67)
FE1 417.972 227.829(RCA)
F45 417.972 227.829(RCA)
Now, I can understand why a stiffer spring rate would be used on the rear of the convertible vs. the Y07 FE1 because of the additional bracing and weight for the softop frame... But for the convertibles to have a spring rate equal in the front & stiffer in the rear than the Z51 Coupe(s) overall seems a bit strange.....
FYI: The part numbers for the Y07 Z-51 front spring is 17999032, and the part number for the Y67 FE1 spring is 17999031.
Can this be right?
I do have one question, something that doesn't make a lot of sense to me. I posted this question the followng thread here but was a bit off topic.
Below is the listings, converted to lb/ft from N/mm, for the 1996 C4....
Front Rear
CPE(Y07)
FE1 342.6 148.46(RHZ)
FE1/Z16 342.6 148.46(RHZ)
F45 342.6 148.46(RHZ)
F45/Z16 342.6 148.46(RHZ)
Z51 417.972 188.43(RHY)
Z51/Z16 417.972 188.43(RHY)
CNV(Y67)
FE1 417.972 227.829(RCA)
F45 417.972 227.829(RCA)
Now, I can understand why a stiffer spring rate would be used on the rear of the convertible vs. the Y07 FE1 because of the additional bracing and weight for the softop frame... But for the convertibles to have a spring rate equal in the front & stiffer in the rear than the Z51 Coupe(s) overall seems a bit strange.....
FYI: The part numbers for the Y07 Z-51 front spring is 17999032, and the part number for the Y67 FE1 spring is 17999031.
Can this be right?
Thread Starter
Instructor
Joined: Jun 2006
Posts: 110
Likes: 2
From: SnoCo, WA
From http://www.idavette.net/susp_chart.htm by Hib Halverson, converted to lb/ft
(1995)
CNV FE1 (Early)
417.972(f), 227.829(r)
CNV FE1 (Late)
342.6(f), 148.46(r)
CNV FX3
342.6(f), 148.46(r)
Again, back to my original question, does it make sense that the later C4 Convertibles would run a higher spring rate than the GS Z51? I suppose they might, but.....
(1995)
CNV FE1 (Early)
417.972(f), 227.829(r)
CNV FE1 (Late)
342.6(f), 148.46(r)
CNV FX3
342.6(f), 148.46(r)
Again, back to my original question, does it make sense that the later C4 Convertibles would run a higher spring rate than the GS Z51? I suppose they might, but.....
