Author Topic: coil-over (Read 8339 times)

romkasponka · « **on:** November 28, 2006, 08:10:07 AM »

what do you think? F500/R450 lbs/in

Gunni · « **Reply #1 on:** November 28, 2006, 09:10:44 AM »

according to the internet the ratio of the rear springs is .65
100lbs work as 65lbs and so on,

500front and 292lbs doesn�t sound right,
What are you basing the numbers on?

Also if the sleeve is more then 51mm it will fit, I had a 51mm sleeve opened up by 1mm the other day to make things fit

romkasponka · « **Reply #2 on:** November 28, 2006, 09:14:03 AM »

The rear will be direct fit on the damper. So the ratio will be ~1,1 or more.

suspensio frequency wiil be F 163 cpm, R 186 cpm.

Gunni · « **Reply #3 on:** November 28, 2006, 09:25:14 AM »

Well in that case,
I belive I read on the gustave site or elsewhere that the rear needs a little more stiffness then the front to neutralize understeer tendency

romkasponka · « **Reply #4 on:** November 28, 2006, 09:31:34 AM »

In my case efective stiffnes is F500/R540

D. Clay · « **Reply #5 on:** November 28, 2006, 02:36:55 PM »

What about the upper shock mounting area. You're gonna need beef! 500+ pounds/inch into that? Get out the welder!

romkasponka · « **Reply #6 on:** November 28, 2006, 03:30:59 PM »

I'm thinking about rear strut bar.........

romkasponka · « **Reply #7 on:** November 28, 2006, 03:34:28 PM »

Quote from: D. Clay;14597

What about the upper shock mounting area. You're gonna need beef! 500+ pounds/inch into that? Get out the welder!

What do you mean by saying beef? Sorry for my poor english.
I found that M3 had 685/1027.

Gunni · « **Reply #8 on:** November 28, 2006, 03:34:41 PM »

Quote from: romkasponka;14571

In my case efective stiffnes is F500/R540

Could you explain why you get that effective ratio?

romkasponka · « **Reply #9 on:** November 28, 2006, 03:37:08 PM »

rear shock is mounted behaind halfshaft, so the shock lever is bigger than wheel lever.

Gunni · « **Reply #10 on:** November 28, 2006, 03:40:57 PM »

could you explain the painting a little bit more?
where exactly are you thinking about mounting the rear shock?

romkasponka · « **Reply #11 on:** November 28, 2006, 03:54:10 PM »

Gunni · « **Reply #12 on:** November 28, 2006, 06:59:10 PM »

If you use a strut brace in the back you will probably need to add strenght from it to the body with welding,

D. Clay · « **Reply #13 on:** November 28, 2006, 09:12:42 PM »

Quote from: romkasponka;14605

What do you mean by saying beef? Sorry for my poor english

As in the expression "beef it up". Meaning to reinforce, brace, and strengthen. It may be a US expression. All of the rear suspension load will be entering the structure at the upper shock mount. It was designed for the shock only and not the shock and spring load.
Here's a link to a picture and text explaining some of the ratios discussed above:
http://e30m3performance.com/tech_articles/susp-tech/eff_rate/eff_rate2.htm
This is the best article I am aware of. Note on the first page the author indicates that his earlier determination was in error. Suspension is art, craft, science, and voodoo.

romkasponka · « **Reply #14 on:** November 29, 2006, 07:35:17 AM »

Quote from: D. Clay;14642

http://e30m3performance.com/tech_articles/susp-tech/eff_rate/eff_rate2.htm
This is the best article I am aware of. Note on the first page the author indicates that his earlier determination was in error. Suspension is art, craft, science, and voodoo.

Yes, I know this article.

I would like to be a woodoo master