TEGNO1

Hi
I found a post on one of the other forums.... some of it is.

Integra G2 motion ratios:
Front: 1.5:1 (for one inch of shaft travel you get 1.5 inches of wheel travel.
Rear: 1.35:1

Wheel rate = (spring rate / (motion ratio squared))

Front wheel rate = spring rate / 2.25

Rear wheel rate = spring rate / 1.82

Most competition cars' suspension frequencies are around mid to high 2 cycles per second. That equals to wheel rate around 0.6 - 0.8X the corner weight. Currently, there is a lot of discussion among the Formula Ford guys as well as the D/E Mod guys from SCCA about going to 1-1.5X corner weight. I think for autox, 1X is about the upper limit and 1.5X is overkill. For a street driven car, I would say 0.5x the corner weight is about the maximum one would want to go.

Now my question is using my spring rates 950 front, 1050 rear sounds scary stiff.
But going by the formula this would give me a spring rates of 420 front, 580 rear at the wheels.
Corner weights of 0.5 and .75 roughly.
What i dont get is how the factory spring rates of 100 to 200lbs would be possible and would be extremely soft like 50lbs to 100lbs at the wheels.
Any opinions on this do stiff springs feel softer on hondas compared to a strut suspension.
Are the standard rates at the wheels or the actuall spring rates.

TunerN00b

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TEGNO1 &raquo;</TD></TR><TR><TD CLASS="quote">Hi
I found a post on one of the other forums.... some of it is.

Integra G2 motion ratios:
Front: 1.5:1 (for one inch of shaft travel you get 1.5 inches of wheel travel.
Rear: 1.35:1

Wheel rate = (spring rate / (motion ratio squared))

Front wheel rate = spring rate / 2.25

Rear wheel rate = spring rate / 1.82

Most competition cars' suspension frequencies are around mid to high 2 cycles per second. That equals to wheel rate around 0.6 - 0.8X the corner weight. Currently, there is a lot of discussion among the Formula Ford guys as well as the D/E Mod guys from SCCA about going to 1-1.5X corner weight. I think for autox, 1X is about the upper limit and 1.5X is overkill. For a street driven car, I would say 0.5x the corner weight is about the maximum one would want to go.

Now my question is using my spring rates 950 front, 1050 rear sounds scary stiff.
But going by the formula this would give me a spring rates of 420 front, 580 rear at the wheels.
Corner weights of 0.5 and .75 roughly.
What i dont get is how the factory spring rates of 100 to 200lbs would be possible and would be extremely soft like 50lbs to 100lbs at the wheels.
Any opinions on this do stiff springs feel softer on hondas compared to a strut suspension.
Are the standard rates at the wheels or the actuall spring rates.
</TD></TR></TABLE>

Stiff springs do feel softer on Hondas compared to a strut based car, the motion ratio is different. A 420 lbs/in wheel rate is the same as a 420 lbs/in wheel rate on a strut based car, but the strut car will have nearly a 1:1 motion ratio, and be must closer to a 420 lbs/in spring to get to that wheel rate.

Standard rates are spring rates, not wheel rates. 220/110 (Integra example) is a reasonable spring rate for a purely street driven car.

And if you want to get into suspension frequencies, heh. Everything I have read seems to indicate that a given tire will only produce good drip up to a specific frequency, before falling off due to hopping over the pavement, with the value differing from tire to tire. But, my understanding is very limited, and I have yet to find much useful information on this site concerning suspension frequencies.

TEGNO1

Thanks
Also say on a 800lbs corner
A 200lb spring will compress more than a 800lbs spring at static ride hide.
Does the softer spring get alot stiffer after been installed due to being compressed more than the 800lb spring.

TunerN00b

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TEGNO1 &raquo;</TD></TR><TR><TD CLASS="quote">Thanks
Also say on a 800lbs corner
A 200lb spring will compress more than a 800lbs spring at static ride hide.
Does the softer spring get alot stiffer after been installed due to being compressed more than the 800lb spring.</TD></TR></TABLE>

The softer spring doesn't "get stiffer", it will simply be compressed more with the same weight placed upon than a stiffer spring would. Each spring would still respond in a manner according to its rate. A 200 lbs/in spring with 800 lbs of static weight on it, will still need another 200 lbs of force to compress it another 1" past the static weight.

Only progressive springs will get stiffer as they are compressed.

TEGNO1

Excellent