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Old 03-26-2004, 07:38 PM   #1 (permalink)
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Front coilover angle?

I am wondering what is the best angle for mounting coilovers on the front of a rig. We don't ahve the room to angle them in too much, maybe 5-10 degrees. My question is do I angle them back? This CJ willl be driven on the street as well as on the trail. Do I mount them 5-10 in, and then 5-10 back as well? Or do i mount them straight up in a vertical position?

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Old 03-26-2004, 07:42 PM   #2 (permalink)
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I've never done this...so I could be talking out my ass here, but I don't really think it matters too much. The mounting angle DOES have to be taken into account when choosing spring rates. I think there are some formulas on Sway-away's website. More angle forward or back can get you more travel out of the shock as well.
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Old 03-26-2004, 07:46 PM   #3 (permalink)
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Not too worried about getting more travel out of them as much as getting good stability. Thanks for the comments, keep them coming.

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Old 03-26-2004, 08:47 PM   #4 (permalink)
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i have mine 10 back and 10 in
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Old 03-26-2004, 09:00 PM   #5 (permalink)
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The further in you move them, the more you sacrifice stability. Front to back will only change the leverage and tweak the actual spring rates.
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Old 03-27-2004, 03:28 AM   #6 (permalink)
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The difference in effective spring rate is the sin of the angle

there's no mgic number that confers stability. It's all in your spring rates and valving (and perhaps swaybars)

If they fit straight up and down, fit them up and down
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Old 03-27-2004, 07:23 AM   #7 (permalink)
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Flatty,

You should always mount coil-overs will one simple goal. Mount them as wide on the axle housing as possible. For example, on a Dana 44 housing, mount the shock at the ball joint nut vs. mounting the shock 2" in from the "C" is about 35% more stable.

From that point you can angle the shock in to clear the tire at full compression. Angling the shock back seems to help front to rear weight transfer. I don't normally like very much front/back angle in the front shocks but do prefer 15+ degrees forward in the rear shocks.

Just make sure you do the links first and cycle the suspension to find the max width the shocks can be mounted. An inch is a mile in shock placement.

The other reason for angling the shock in is so you don't push past 90 degrees on the arch curve that the shock follows. This keeps the shock from camming and basicly allow travel without the shock shaft moving. This is less important then wide mounting pattern but in a perfect world....

Good luck.

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Old 03-27-2004, 07:30 AM   #8 (permalink)
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I remember Eric at FAT CITY saying lay them in a little and back a little and they will float over the bumps. A little = 10-15*

When I did my rear coilovers on my FJ40, I bought them from Tony K and he said the same thing 10-15* in and 10-15* forward (rear axle). He also said to mount them as wide on the axle as you possibly can for stability.

Quote:
Originally posted by BillaVista
The difference in effective spring rate is the sin of the angle
Bill is right, but using the cosine of the angle is easier to see resulting % rather than using the sine of the angle which gives you the % less effective compared to a shock at 90*.


If you lay them in 10*, you only loose about 2-4% so don't sweat it.

You are looking at the angle correction factor (ACF)

cos 10* = 98.5% as effective to 90*
cos 15* = 96.6% as effective to 90*
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Old 03-27-2004, 10:50 AM   #9 (permalink)
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Put them in the right spot and you may run 150/250 springs.

Put them in the wrong spot and you may be running 350/500 springs.

Then all the cos etc does do you any good. It still drives like crap.
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