11-17-2009 | #1 |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,170
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Coilover Spring rates
So I did the Coilovers on the front of my car in June of this year. When I installed them I did 425# springs
I am getting ready to order the rest of my parts for the rear conversion, but what is a good spring rate?? I was thinking of 300# or 275# but what is the benefit of either?
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
11-18-2009 | #2 |
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,155
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Re: Coilover Spring rates
I would like to know as well.
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GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V |
11-18-2009 | #3 |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,170
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Re: Coilover Spring rates
According to Doug Rippie, 300# will be too stiff and he recommends 275#
they use 450# or 400# for the front, I am running 425# and like that so far Coilovers for the rear got moved to the backburner again due to other issues that have come up
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
11-18-2009 | #4 | |
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,155
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Re: Coilover Spring rates
Quote:
Thanks for the research I remember Ron talking about the buckboard rear springs he had setup so I was wondering
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GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V |
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11-18-2009 | #5 | |
Join Date: May 2005
Location: Leesburg, VA
Posts: 2,713
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Re: Coilover Spring rates
Quote:
I've never installed them though, so I don't know. Looking at the leafspring rates, 300 is less than the Z51 rear rates, and above the base rate. 425 front is more like the '92+ cars that had softened front spring rates (even the Z07/Z51 cars). I don't want softer fronts, so if I ever did install them I'd go much stiffer front like 5-600. Did you have to relocate the sway bar to do the fronts?
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Bob Saveland Former owner of #2517 [IMG]http://a.random-image.net/aurora40/vette.jpg[/img] |
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11-18-2009 | #6 | |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,170
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Re: Coilover Spring rates
Quote:
rear is still OEM and since I still have time I need to thin about the 275 vs 300 a little more. For me with the leafs or the front coils I drive in sport mostly
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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11-18-2009 | #7 | |
Join Date: May 2005
Location: Leesburg, VA
Posts: 2,713
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Re: Coilover Spring rates
Quote:
A stock '90 ZR-1 has a 96.2 N/mm spring, which is ~550 lbs/in. The Z51 rate was 660 lbs/in. The '92+ Z was 430 lbs/in. So I'd think a 425 coil spring would be softer than the later cars. People who install coil-overs though do not seem to go to those sort of extreme rates in the 550+ range. Which is why it seems like the math must be more complex than that or something?
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Bob Saveland Former owner of #2517 [IMG]http://a.random-image.net/aurora40/vette.jpg[/img] |
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11-18-2009 | #8 | |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,170
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Re: Coilover Spring rates
Quote:
I will see if I can find it again
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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11-18-2009 | #9 | |
Join Date: Jul 2007
Location: Bartlett, IL
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Re: Coilover Spring rates
Post by Glass Slipper on CF in this Thread http://forums.*************.com/c4-z...g-the-fx3.html
The quote refers to rkreigh who is using 400 front/ 250 rear according to the link above Quote:
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 Last edited by -=Jeff=-; 11-18-2009 at 11:23 PM. |
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11-18-2009 | #10 |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,170
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Re: Coilover Spring rates
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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