[tOngEh]

HI all.
I happened to chance upon this site:
http://f-o-a.com/calculator.html

I wanted to do a dual setup on my 03 grand vitara. 2L 4drs. Front IFS had been converted into SAS.
I encountered a problem in obtaining some figures for calculator input.
Below are the measurements i took:
17 inches 1. Wheel travel
730 pounds 2. Sprung weight of each applicable vehicle corner
40 inches 3. Pivot to lower shock mount distance (D1, D3, or D5)
40 inches 4. Pivot to end of suspension arm or tire centerline (D2, D4, or D6)
60 percent 5. Desired droop travel
5 degrees 6. Shock angle from vertical (in degrees)

Calculated single spring rate 72lbs/inch.
Calculated dual spring rate primary 121lbs/in secondary 183lbs/in

Does this figure sound right? I rem the spring rate for a 4 dr vitara is about 400lbs/inch. Seems like a bit far from my results.

[royce]

remember with SAS the springs act driectly on the diff so 1:1 ratio, on IFS they are almost halfway up the arm so while the springs are 400lb (closer to 500 I think?) the rate at the end of the arm will be closer to about 200.

[tOngEh]

Yup note taken. Based on my calculated 72lbs/in sping on SAS. If i were to use it on a IFS setup. SHould it be about 144lbs/in? Doubled due to leaverage.

[royce]

121/183 sounds right, 72 is way too low

[tOngEh]

HOw do you derived that figure? 1500kg divided by 4?
By the way, whats the spring rate for sierra? Front and rear? From there i can have a easier estimation of my heavier ride.