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Spring Rates for FC

Old 04-16-04, 08:53 AM
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Spring Rates for FC

Posted this in the suspension area too, but what the heck, why not here too


Got my FC cornerweighted last night, to see with the stock suspension what the numbers were.

Car: '90 GTU Steel hood A/C, and Powersteering, sunroof

Total Car Weight (no driver): 2895

Front: 54.5%

Rear: 45.4%

Cross weights seem pretty good

RF LR = 50.8%
LF RR = 49.1%

With Driver (175lb) weights:

Front: 53.7%
Rear: 46.2%

Any ideas? 350 front / 250 rear? Prolly be getting a GC package.

How much camber can I get with out the camber plates in front?

Last edited by SoloIIdrift; 04-16-04 at 09:04 AM.
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Old 04-16-04, 10:36 AM
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Try the Mazdaspeed Stage 2 IT kit. I think the spring rates are 400 and 275, comes with everthing, camber plates, rear spring height adjusters, etc... You have to sign up and wait a few weeks to be processed through, but I think you'd have a hard time finding a better performing suspension setup for the FC in that cost range ($2500).

-Trent
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Old 04-16-04, 10:39 AM
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Well this car is 80% daily, 10% autox 10% Track schools (HPDE's) So I doubt I'd want that much. I'm looking hard at the GC/Tokico kit because I could use 350/225 rates for street, and swap the springs out for autox events and track events to like 500front 300 rear or something.
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Old 04-16-04, 11:40 AM
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Originally posted by TrentO
Try the Mazdaspeed Stage 2 IT kit. I think the spring rates are 400 and 275, comes with everthing, camber plates, rear spring height adjusters, etc... You have to sign up and wait a few weeks to be processed through, but I think you'd have a hard time finding a better performing suspension setup for the FC in that cost range ($2500).
I hope this think comes with shocks?
Koni Sport yellows?
Double adjustable?
Unless they are special shocks, K2RD (Suspensin combo "B") kit at around HALF that price does the same thing.


-Ted
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Old 04-16-04, 01:17 PM
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You need to look at how much spring your shocks can handle. 500 and 300 lb springs are quite a lot on shocks that are made to be used with stock springs. I know they can handly more than stock, but that's getting really high (stock is only 95/90). It should be alright in the front, but the rear would get quite bouncy with rates these high without revalving the dampers.

- Cooper
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Old 04-16-04, 01:19 PM
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Like Ted said, My GC Advanced Designs plus camber plates were less than 2500.00. As far as rates, I'd say 400/275 for a dual use car w/adjustable sway bars front, and rear. Koni Sports are around ~160 per, springs are ~65 per, camber plates ~300.00, GC kit ~300.00, sways 300.00, toe eliminator ~75.00. So, for 2K you are very complete. You could just do the Konis, and GC kit to start for ~1200.00. With a good damper the 400s are fine for the street, and a neccesity unless you upgrade your sway bar. For a dual use car you might want a slightly lower front rate, but only if you do the sway bars. Carl
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Old 04-16-04, 03:36 PM
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I tried to check on the MazdaSpeed site, but it's down at the moment. The kit comes with adjustable Koni's for all four corners, sway bars, adjustable rear camber link, etc. The price might be lower, I just can't recall it at the moment.

-Trent
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Old 04-16-04, 07:15 PM
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400/275 is probably a bit much for the street, and so far it seems to not be enough for the track, although we'll see.

THe Mazdaspeed kit is 1750, comes with single adjustable Konis, BEEFY strut housings (no cutting apart the stockers), springs of your choice, camber/caster plates up front, camber link out back, and swaybars front and rear.

Good deal IMO for the money.

PaulC
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Old 04-17-04, 02:27 AM
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Originally posted by Silkworm
THe Mazdaspeed kit is 1750, comes with single adjustable Konis, BEEFY strut housings (no cutting apart the stockers), springs of your choice, camber/caster plates up front, camber link out back, and swaybars front and rear.

Good deal IMO for the money.
Ok, that's a more reasonable!


-Ted
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Old 04-17-04, 02:28 AM
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where can you get the mazdaspeed kit?
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Old 04-17-04, 12:06 PM
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You guys got any links to explanations on the basis of what springs to use depending on weights of the cars etc. Basically all your talking about. I'm trying to get more into all this stuff and get a better understanding of it, cause I want to be able to rationalize what I'm doing to the car etc. Thanks guys. You always provide some new peice of information that I get excited about, and that I can't help but investigating just to learn more about it. Yeah I know I'm a nerd

- Steiner
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Old 04-17-04, 12:08 PM
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Im runnin this now;

Tokico Illuminas
GC 450/f 325/r coilovers
GC Caster/Camber plates
Racing Beat Sways f/r
Mazdatrix End links f/r
Mazdatrix Camber link
Front strut bar


It is pretty nice, and not bad on the street however i cant wait to go with the Advanced Design and some higher spring rates.
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Old 04-18-04, 08:44 PM
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I"m running the K2RD.com kit and opted for 400/275# springs. Any stiffer and you need better shocks like Konis. This my daily driver and it is STIFF. I can feel cracks/bumps/rocks in the road.... however on smooth surface it is great. Car handles excellent and I adjust the KYB AGX's to full stiff of upfront and near full stiff out back. Car is a super base model '87 SE with T2 brakes/wheels/differential.

If I were to do it again I would get 350/225 or 325/225 spring rates. Just a little much on the street some times.

-GNX7
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Old 04-19-04, 08:15 AM
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Originally posted by gnx7
I"m running the K2RD.com kit and opted for 400/275# springs. Any stiffer and you need better shocks like Konis. This my daily driver and it is STIFF. I can feel cracks/bumps/rocks in the road.... however on smooth surface it is great. Car handles excellent and I adjust the KYB AGX's to full stiff of upfront and near full stiff out back. Car is a super base model '87 SE with T2 brakes/wheels/differential.

If I were to do it again I would get 350/225 or 325/225 spring rates. Just a little much on the street some times.

-GNX7
Cool thanks, that is what I wondered.
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Old 04-23-04, 06:43 PM
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Originally posted by gnx7
If I were to do it again I would get 350/225 or 325/225 spring rates. Just a little much on the street some times.
Thats funny. I was thinking the exact opposite. I have 350/250 and was thinking about going 450/350. The front end scrapes really bad when the front is loaded and I hit a bump, and the car rolls a little too much, so I was hoping the higher rate would help.
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Old 04-25-04, 07:37 PM
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don't forget your tire sidewall is essentially a spring as well. the tires you run and tire pressures will also greatly effect the ride quality especcialy with stiff spring rates.
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Old 04-25-04, 10:43 PM
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Im currently running a set of Silkroad RM/A8 8 way double height adjustable coilovers right now. I have 8kgs in the front and 6kgs in the rear. They come with camber plates in the front as well. I got them shipped to my door from Japan for $1400. When I got them they gave a extra set of springs so I got two 10kgs and two more 8kgs. I used to use the ground control kit, and then an older set of HKS Hyper Max Ds. The Silkroads are alot nicer and more durable. Ive talked to a bunch of people and they say they are as good as Zeal coilovers and alot better than the JICs. $1400 for the coilovers and you could still get a few other things before you reached the price of the Mazdaspeed kit. As nice as Mazdaspeed stuff is its $$!.
-Stew
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Old 04-26-04, 10:45 AM
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Originally posted by Stews'7
Im currently running a set of Silkroad RM/A8 8 way double height adjustable coilovers right now. I have 8kgs in the front and 6kgs in the rear. They come with camber plates in the front as well. I got them shipped to my door from Japan for $1400. When I got them they gave a extra set of springs so I got two 10kgs and two more 8kgs. I used to use the ground control kit, and then an older set of HKS Hyper Max Ds. The Silkroads are alot nicer and more durable. Ive talked to a bunch of people and they say they are as good as Zeal coilovers and alot better than the JICs. $1400 for the coilovers and you could still get a few other things before you reached the price of the Mazdaspeed kit. As nice as Mazdaspeed stuff is its $$!.
-Stew
How do they ride? I thought I heard there was a US distributer...no?
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Old 04-26-04, 12:38 PM
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They ride awsome! Being dual height adjustable they dont ride as harsh as the GC or the HKS's on the street. Been out drifitng a bit with them and they rock!!! They do now have a US distributer, but I bought these thru a wholesale place for alot cheaper. DGtrails sell these for $1400 plus shipping to your house and it take a long while. I had mine EMSd so that jacked the price up to the $1400 but got them in 3 days. How soon you looking to get something? I can help you out if you are intrested a set of Silkroads.
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