ground control coilovers troubles
 

I just installed KYB AGX and ground - control coilovers on my new car and i have problem

in front i have it set-up all the way up and car is too low....i can`t go higher

I guess i did something wrong while putting it all together.

Does anyone have GC manual for completting front ?

I do have GC caster/camber plates as well...

any manual or detailed pictures would be appreciated

thanks

how long are your springs?

maybe you should have ordered longer ones

in picture....longer ones goes rear, shorter front?

well the stock rears are taller than the fronts so I'm thinkin yeah.
That's how you put them on? And it's too low? I wonder then if they sent you the kit for some other car. Check the model # and call GC.

Cory
Wishes you good luck.

What spring rates and lengths did you get?

Rob

In the photo right on the box it says

Front Springs: 150.64.92
Rear Springs: 200.64.44 (or does it say 49?)

These must be the metric markings. My GC springs read like this
F: 700.250.450 (7" long, 2.5" diameter, 450lbs/in)
R: 800.250.325 (8" long, 2.5" diameter, 325lbs/in)

Converting your metric numbers to std. they read like this. (using 25.4 mm per inch) (2.2 kg per lb.)
F: 5.9" long, 2.5" diameter, 500 lbs/in
R: 7.8" long, 2.5" diameter, 245 lbs/in

Your front springs are more than an inch shorter than mine is (and if my math is correct they are a REALLY stiff spring rate).

On my car with the 7" front springs they are run really high up to get the car at a height I like. It is possible you have the wrong size springs for the front.

what i have (u could see it on spring, label is wrong imho) :

Front 150.64.66
Rear 200.64.44

In your photo I did not notice the difference from the sticker and what is stamped on the springs. The 150.64.66 gives you around 370 in/lb. springs (in US terms) that sounds a bit more reasonable.

When I got my kit I asked for their Street / Race setup because at the time I planned on putting them on my daily driver. Later when I changed the car over to be a dedicated race car I ordered the same length and diameter springs but at higher spring rates.

When you ordered this set from GC what did you ask for?

How do you have your caster/camber plates mounted? On top of the shock tower (engine compartment side) or under the shock tower (wheel well side)? I have seen them mounted both ways and that would effect the height adjustment.

Can you post a picture of your springs installed and how high up you have them setup?

i will have to take picture of my car tomorrow, been busy with friends car....

i have them installed in wheel well side

i ordered my GC coilovers year or more ago, thru some online store and did not really had chance to ask for exact setup (by that time i didn`t knew enough about it anyways :)

i have it in car which i would like to drive daily in this summer and here in Prague, there are no streets, its more in off-road category....so i would like to be able to raise it up little bit :)

With a 370 lb spring rate and camber plates I think you need 7" springs.

The weight of your convertible will compress those springs close to 2.25". With a 6" spring you only have about 3" of total travel. So you've got maybe 1" of travel left. Which isn't enough. I'd say you need longer springs. That will get you more travel and get the ride height up.

The camber plates will also lower the car making your ride height problem worse.


Rob

i have no convertible, my car is S4 TII

I'm sorry. I got the idea someplace you had a convert. I'll still bet you've almost used 2" of travel. The point being you don't have much travel left (if the 6" spring calc I saw above is correct). I think a 7" spring is a safer bet.

Rob

and spring rate for that 7" should be?

Fly me over there and I'll fix it for you. :-)

sorry Dave, but i am not sure u are the best one to install and tune my E11 with GT35/40 ;o)))

and without your RX-7's what would u be doing here? :)

Your 370 lb spring isn't too bad for a street driven car. But to get the ride height right you need to determine how far you want to raise the car from it's present height. The 7" spring I mentioned above will get you 1" higher than you are now. An 8" spring will get you 2". Part of the problem is that the GC collars only give you about 2" of total adjustment (In the front). So you don't have a lot of room to work.

So if you think your car is for example 1" lower than you want and your lower spring perches ar at the top of the collar, you have maybe 3" to play with.

Rob

gotcha....now i just need to know what 370lb is in kg/cm or what unit is used here in europe ;o)))

I thought we had determined you had a 370 lb spring. If you change the spring rate you have to take the change in its initial compression into account when making your calculations.

Rob

ok, but what 370lb spring is in kg/cm ?

Here's a site for doing conversions.Maybe it can help you.

http://www.onlineconversion.com

I am just assuming that the last number listed on your springs are in kg / cm (# KG of force to compress the spring 1 cm). If it is not then it blows away everything below.


2.2 lbs = 1 kg
1 in = 2.54 cm

To convert kg/cm to lb/in you would just multiply.

y(kg/in) * 2.2 * 2.54 = x(lb/in)
66 * 2.2 * 2.54 = 368.8 (close enough to call it 370)


To convert back just divide
( z (lb/in) / 2.2 ) / 2.54) = y(kg/cm)

( 368.8 / 2.2 )
(168.3636 / 2.54) = 65.99 kg/cm

ok, i have got longer springs for front

even stiffer

73kg/cm2, 180mm long

pictures here :

http://rx7cz.net/photos/workshop29/

If I did the conversion right that is a 7" 400 lb spring (for us non metric guys). That is the MazdaComp IT recommendation.

Rob

they fitted ok, i set up ride height to middle for now and i am trying to find best setting for KYB AGX shocks....

i did set it up to 3 in front and 6 in rear for now....