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Author Topic:   4 bar question
Dirt Full Roller

Total posts: 62
posted February 07, 2005 07:41 PM  
just wanting to know exactly what indexing means and does.we always just level them and thats it, is this the same thing or is this two different subjects,thanks in advance

Dirt Forum Champ
Total posts: 753
posted February 07, 2005 08:26 PM  
What you do when you index is the birdcages will not be level at ride height. If you index towards the spring then it can help the car jump on the bars quicker. Tightening it up on the throttle. I never have messed with indexing. (or at least not yet!) I always just level them at ride height. I'm sure someone here does it and can elaborate on this more than I can.

Dirt Full Roller

Total posts: 62
posted February 08, 2005 04:40 AM  
thanks for reply,hoping to get more details,

Dirt Forum Champ
Total posts: 755
posted February 08, 2005 06:56 AM  
I always refer to indexing as the rotation of the birdcage about the axle centerline during suspension travel.

When I set the birdcage perpendicular to the floor, I refer to this as "timed".

Dirt Freak

Total posts: 209
posted February 09, 2005 02:03 AM  
when you "index" the birdcage, as people say. you are simply lowering the upper 4-link rod on the birdcage, bringing it closer to the axle (though some birdcages have multiple holes which will rotate the birdcage forward a significant amount).

we have "indexed" a few times on our latemodel, and have found that when combined with the maximum angle available on our left upper 4 bar rod, this produces maximum forward bite when on the throttle exiting the corner BUT because it speeds up and increases the amount of dynamic birdcage rotation (pushing against the spring), if you get off the throttle abruptly to enter the corner, you get a very quick loose feeling as the birdcage "unwinds" very quickly.
thats what it felt like to me, even spun the first time entering the corner when it caught me by surprise. i found it alot better if you roll off the gas carefully and earlier before the corner and also keep some pressure on the brake pedal with your left foot, seems to keep the car loaded through the corner.
as you can imagine, its quite difficult to drive and i sure haven't mastered it yet but it is interesting to try.
we have only done it a couple of times, and only when its really dry slick.

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