antisquat %, IC height & length discussion - S197 mustang

[06stangia]

Horizontal UCA length: 7.75"
Horizontal LCA length: 18.125"
Rear Factory UCA bolt Height: 22.75"
Front UCA bolt height: 18.25"
Reat LCA bolt height: 5.75"
Front LCA bolt height: 6.5"
Rear car Weight: 1820lbs
Front car weight: 2120lbs
center of gravity height: 20.75"
wheelbase: 107.125"
Ride height rear: 27.75" ground to wheel well
Ride height front: 27" ground to wheel well

Antisquat: 129.98%
Instant Center Length: 27.33"
Instant Center Height: 6.88"

Ok now what do I do to fix it?
I have Eibach pro lowering springs, J&M LCA nonadjustable, J&M UCA adjustable, stock shocks.

 

[luv2cheat]

Horizontal UCA length: 7.75"
Horizontal LCA length: 18.125"
Rear Factory UCA bolt Height: 22.75"
Front UCA bolt height: 18.25"
Reat LCA bolt height: 5.75"
Front LCA bolt height: 6.5"
Rear car Weight: 1820lbs
Front car weight: 2120lbs
center of gravity height: 20.75"
wheelbase: 107.125"
Ride height rear: 27.75" ground to wheel well
Ride height front: 27" ground to wheel well

Antisquat: 129.98%
Instant Center Length: 27.33"
Instant Center Height: 6.88"

Ok now what do I do to fix it?
I have Eibach pro lowering springs, J&M LCA nonadjustable, J&M UCA adjustable, stock shocks.

Do you have relocation brackets? What size rear tire?

 

[06stangia]

Yes it is a two hole relocation bracket and is in the bottom hole.I am running 275/35/20 and have et street 26x 11.5x17

 

[luv2cheat]

Yes it is a two hole relocation bracket and is in the bottom hole.I am running 275/35/20 and have et street 26x 11.5x17

What tire was on when you measured? Seems to me maybe the upper bar rear height is a little high by an inch or so. Any way you could re-check?

 

[06stangia]

The 20" tire Was on when I measured it. I can try to remeasure it.

 

[luv2cheat]

The 20" tire Was on when I measured it. I can try to remeasure it.

Your 2-1/2" higher than what I came up with on a 28" tire. Now I had them aired down like I would at the strip so maybe that's the difference? If your measurements are correct I would think raising your bottoms bar would get you closer to 100% AS. How is it hooking now?

 

[06stangia]

Just got et streets but the 20" don't till 3rd gear.

 

[Norm Peterson]

The 20" tire Was on when I measured it. I can try to remeasure it.

22.75" is a little over two inches higher than what I measured mine at with the OE 18" tires.

Your 20's are only about 1/4" taller, so the 2" difference isn't coming from them. Maybe 1/8" of it is.


Norm

 

[06stangia]

ok took another measurement it was 20.375" not 22.75" must have had my tape measure at an angle last time. So new #s are

Antisquat: 85.42%
instant center length: 46.34"
instant center height: 7.67"

 

[luv2cheat]

ok took another measurement it was 20.375" not 22.75" must have had my tape measure at an angle last time. So new #s are

Antisquat: 85.42%
instant center length: 46.34"
instant center height: 7.67"

That makes much more sense!

Maybe using the BMR relocation brackets (they have a 3rd hole) will get you over 100%. Hopefully Kelly chimes in.

 

[daveyboy]

psfracer - what I did was move my UCA to the top hole and kept the LCA relo brackets on the car. This reduced the AS by ~30% and placed the IC very close to the CoG.

I am using full CHE brackets and control arms. The LCA relo bracket mounting holes are the same location as the middle hole on most of the 3 hole LCA relo brackets.

What Upper control arm mounting bracket do you have that allows you to adjust the mounting point?

 

[lindertw]

What Upper control arm mounting bracket do you have that allows you to adjust the mounting point?

not sure which UCA mount wbt is running, but most aftermarket UCA mounts offer at least one extra hole for adjusting IC:

bmr

steeda and steeda

racecraft

hope this helps...

 

[Norm Peterson]

This one also offers some adjustability . . . being that CHE was mentioned.

http://www.cheperformance.com/prod-210.htm


Norm

 

[daveyboy]

not sure which UCA mount wbt is running, but most aftermarket UCA mounts offer at least one extra hole for adjusting IC:

bmr

steeda and steeda

racecraft

hope this helps...

This one also offers some adjustability . . . being that CHE was mentioned.

http://www.cheperformance.com/prod-210.htm


Norm

Wow I never knew that thanks guys

 

[BMR Tech]

ok took another measurement it was 20.375" not 22.75" must have had my tape measure at an angle last time. So new #s are

Antisquat: 85.42%
instant center length: 46.34"
instant center height: 7.67"

That makes much more sense!

Maybe using the BMR relocation brackets (they have a 3rd hole) will get you over 100%. Hopefully Kelly chimes in.

What two hole brackets are you using, stangia?

If you want to see what the BMR brackets will give you, for your IC settings, here:

BMR Hole #1 (2" lower than stock LCA position)
BMR Hole #2 (3" lower than stock LCA position)
BMR Hole #3 (4" lower than stock LCA position)

 

[Boozshey]

Okay, after reading all three pages, my brain hurts and I now know how behind I am from understanding suspension.

With that, I have "EVERY" part BMR sells on the car and I obviously have no clue how to set it up other than bolt it on in stock spots.

Who wants to come over measure out my shit and set it up? Kelly?

 

[Norm Peterson]

The general recommendation for adjusting suspension stuff is to start from the most conservative setting and work your way in the more aggressive direction. So start at the top hole and work down. It's not like it's hard to change the holes, and once you get them set to where you like the way it works, you're done and you can leave it alone. At least until you change something else by enough to matter.


Norm

 

[01bluesnake]

Great thread with a ton of info i was looking for. I have to get some measurements on my car to calculate the AS as it sits, but been a best of 1.59 on M/T stiff side wall slicks with just steeda boss springs and BMR relo brackets on the middle hole. I have a full BMR rear upgrade going in, so will have to measure and recalculate that as well. Question, on radials vs slicks, will radials generally want more AS or less? Thanks

Drew

 

[wbt]

What Upper control arm mounting bracket do you have that allows you to adjust the mounting point?

http://www.cheperformance.com/prod-322.htm
http://www.cheperformance.com/prod-310.htm

 

[Boozshey]

Here is what I got... From what I am gathering if, I moved my LCA arm up to the stock position and not in the second hole it will lower my AS%. Is that what I should do?

Front Suspension:
BMR Kmember
BMR Non-Adjustable A-Arms
QA1 Dual Adjustable Coil Overs with 10" 225lb spring
QA1 Camber Plates

Rear Suspension:
QA1 Dual Adjustable shocks
Cobra Jet drag springs
BMR UCA and adjustable bracket
BMR LCA - Spherical
BMR LCA Relo-Bracket - first upper hole
BMR Panhard Bar
BMR Panhard support Bar
BMR Xtreme Anti-Roll Bar