Front spring recommendations
Posted: Tue May 05, 2009 10:18 pm
Having sorted the problems at the back I'm now looking at the front.
There are spax adjustables here (rock hard, again, but that's now resolved).
The issue I have is that the spring perch is adjusted to the maximum extent (minimum ride height) but still it's a bit higher (say an inch) than I want. From reading previous threads it looks like it's not unusual, where springs are used that were originally intended for dampers with non-adjustable perches.
I will know more if I take it all apart and measure it, but while the weather is good I want to keep driving. So I'm after any "off the shelf" advice/suggestions as to suggested spring rate, free length and suppliers.
The following sums are based on some measurements and guesswork with everything still assembled.
- at the current ride height, the compressed spring length is 9"
- the weight at each front corner is estimated to be 360 lbs
- the mechanical advantage of the suspension action on the spring is 1.8 (read on other thread)
- this gives a load on the spring at rest of 650 lbs
- assume the spring rate is 100 lbs (guess)
- this gives a spring free length of ~15.5" which correlates with the length you'd expect for a spring appropriate for fixed perches.
I'm not racing, the antiroll bar and rear springs are standard. Any thoughts from those who've solved this problem already?
Paddy
There are spax adjustables here (rock hard, again, but that's now resolved).
The issue I have is that the spring perch is adjusted to the maximum extent (minimum ride height) but still it's a bit higher (say an inch) than I want. From reading previous threads it looks like it's not unusual, where springs are used that were originally intended for dampers with non-adjustable perches.
I will know more if I take it all apart and measure it, but while the weather is good I want to keep driving. So I'm after any "off the shelf" advice/suggestions as to suggested spring rate, free length and suppliers.
The following sums are based on some measurements and guesswork with everything still assembled.
- at the current ride height, the compressed spring length is 9"
- the weight at each front corner is estimated to be 360 lbs
- the mechanical advantage of the suspension action on the spring is 1.8 (read on other thread)
- this gives a load on the spring at rest of 650 lbs
- assume the spring rate is 100 lbs (guess)
- this gives a spring free length of ~15.5" which correlates with the length you'd expect for a spring appropriate for fixed perches.
I'm not racing, the antiroll bar and rear springs are standard. Any thoughts from those who've solved this problem already?
Paddy