Instant Center

[Alky V6]

If you want to see the new IC work, check out my video from Vegas. If you slow down the video you can see the tire get planted by the rear suspension when the nitrous hits. Yank city baby.

It's in the turbo video's and picture library section. Alky Buick V6 ver. 2.0. Search last 2 months.

 

[Fuelie600]

I'm running a Moser 10 bolt housing. The upper control arm mountings are much beefier and the location has been moved up. This moves the IC back and down and helps plant the tires when the suspension is shocked. It also controls the cars tendancy to wheelie. Traction has not been a problem with 10.5" slicks. Maybe it's helping.

Don are your lowers mounted in their stock locations?

Thank you for taking the time to get those measurments.

Blazer--Thanks for your input, and computation of the revised centerline on Don's car.

 

[Blazer406]

Don are your lowers mounted in their stock locations?

Thank you for taking the time to get those measurments.

Blazer--Thanks for your input, and computation of the revised centerline on Don's car.

Don't take that is dead nuts accurate.... because it is not too easy to attempt to measure those points with the car sitting on the ground..... it would be easier on a lift with better instruments.... but alas... this is what I came up with.

 

[KEVINS]

Here are some graphs of IC positions.
The first is the stock suspension plotted out and the IC ends up behind the car.

http://www.geocities.com/kdslaby/BUICK4LINKSTOCK.pdf

The second graph is MY car which was already lowered when I purchased it so I drilled new UCA chassis holes to put the IC where I wanted it.

http://www.geocities.com/kdslaby/My_Modified_GN_Graph.pdf

ks

 

[Jerryl]

Here are some graphs of IC positions.
The first is the stock suspension plotted out and the IC ends up behind the car.

http://www.geocities.com/kdslaby/BUICK4LINKSTOCK.pdf

The second graph is MY car which was already lowered when I purchased it so I drilled new UCA chassis holes to put the IC where I wanted it.

http://www.geocities.com/kdslaby/My_Modified_GN_Graph.pdf

ks

Good stuff!
Do you have any pics you can post?

 

[KEVINS]

Sorry, no pics...

KS

 

[Fuelie600]

Don't take that is dead nuts accurate.... because it is not too easy to attempt to measure those points with the car sitting on the ground..... it would be easier on a lift with better instruments.... but alas... this is what I came up with.

Not taken Blazer!

 

[Blazer406]

Here are some graphs of IC positions.
The first is the stock suspension plotted out and the IC ends up behind the car.

http://www.geocities.com/kdslaby/BUICK4LINKSTOCK.pdf

The second graph is MY car which was already lowered when I purchased it so I drilled new UCA chassis holes to put the IC where I wanted it.

http://www.geocities.com/kdslaby/My_Modified_GN_Graph.pdf

ks

Kevin,

Why would mine measure that far off? I haven't figured up exactly how much my measurement points would have to be off for my IC to come out where yours did..... but I would guess all my measurements were +/- 1/4" accuracy.

 

[Alky V6]

Don are your lowers mounted in their stock locations?

Thank you for taking the time to get those measurments.

Blazer--Thanks for your input, and computation of the revised centerline on Don's car.

Lower control arms are boxed stockers with stock mounting locations. Springs are stock. Sway bar is ATR. Control arm bushings are poly. Upper control arms are stock, except for the mentioned mounting location. The ride height is a tiny bit higher because of the poly bushings. The poly bushings don't let the suspension relax down like the stock bushings do.

 

[KEVINS]

Kevin,
Why would mine measure that far off? I haven't figured up exactly how much my measurement points would have to be off for my IC to come out where yours did..... but I would guess all my measurements were +/- 1/4" accuracy.

My measurments are as follows:

RLCA rear point = 8-7/16" off ground
RLCA front point = 9-3/8" off ground
RLCA = 20" long

RUCA rear point = 17-3/8"
RUCA front point = 17-1/8"
RUCA length = 11-1/8"

Autocad says intersecting point is 10'-8 15/16" ahead of rear axle centerline which falls about 22" in front of front axle centerline

This point was 14 7/16" off the ground. QUOTE]

I don't know why they are closer. You do need to be within 1/8" for accuracy tho b/c the control arms are so short an 1/8" of error can move the IC a looong ways.

If you look at your #'s and subtract the UCA and LCA chassis hole measurements then you get: 17.125"-9.375"=7.75"

Mine for my car are: 17.25"-9"=8.25" (both of my graphs are 8.25") which may not be that far off if your numbers are not accurate. Also, there could be that much slop in MFRing tolerances which is why I prefer to plot chassis out before making changes.

Our Axle measuremts are about right on, tho at approx. 9".

BTW, you do NOT use the actual control arm lengths, instead you use the perpindicular distance to the axle centerline of the arms.

ks

 

[Fuelie600]

BTW, you do NOT use the actual control arm lengths, instead you use the perpindicular distance to the axle centerline of the arms.

ks

Please explain. I'm a tad bit confused . Brian

 

[KEVINS]

Please explain. I'm a tad bit confused . Brian

Because the UCA's are angled outward you don't use their true length. Instead measure from the front control arm bolts straight back to the axle centerline.

ks

 

[Fuelie600]

That clears things up. So simple, I can actually understand :biggrin: . Thanks, Brian