more anti-squat.....relocate upper or lower arms

mommasGN

Active Member
hey guys.

When changing rear suspension geometry of our cars, what are the pros/cons of relocating the upper arm mounting location, versus the lower? Using Instant center and Anit-squat calculators i can come close to the same anti-squat numbers moving either arm, but the IC is much further back moving the upper. . Does either effect handling in a negative way? I drive this car quiet often on the street

Several different lower brackets are available (bolt-in, weld-in). but only one or two (baseline suspensions) for the upper and require new upper arms.

thanks in advance
 

Nigel

Well-Known Member
I have the baseline bolt in kit installed. My car runs 11.0s@120 with high 1.5 60 ft on 255/60s. The kit along with good shocks and a spohn anit-roll bar made a huge difference in the launch. I have only been to the track once and was halted after two runs because of no roll bar. Been thinking about a bar, but it has been a year since I was at the track. If you are making more power than I am and take the car to the track, I don't think you can go wrong with the kit. You have to do your homework and put a little thought into the set up. Below is a before and after snap shot of my set up with the kit.
Street driving is fine, I think the only thing I don't like on the street is the spohn anti-roll bar, it is too stiff for street duty. Works great at the track though.

Before Upper Control Arm Kit
1650494690854.png


After Upper Control Arm Kit
1650494742935.png
 

mommasGN

Active Member
so the baseline kit is a bolt-in? I couldnt find any installed pics anywhere. wasnt sure if it was bolt-in or weld-in.
 

Nigel

Well-Known Member
so the baseline kit is a bolt-in? I couldnt find any installed pics anywhere. wasnt sure if it was bolt-in or weld-in.
The kit comes with good instructions and is bolt in, you can however weld it in if you desired to do that.
 

Nigel

Well-Known Member
Which kit?... Made by who? I have H&R uppers and Wolfe Racecraft lowers and they're probably adjusted wrong because my car is not 60ft.ing very good.
This is the kit I installed.
Street-Launch Gold
I went a little overkill for the power I'm making though as I added Strange adjustable shocks on all four corners, TRZ housing bushings, and the Spohn drag bar.

I set up the uppers with an angle finder.
Uppers are 8 degrees down
Lowers are 1.3 degrees up (stock)

Before the changes you could feel the car twist and front end rise loading it up on the break.
Now the car does not move at all when loading it up, solid leave with no sudden drop(squat) in the rear, good weight transfer without topping the front.
Really big difference in the before and after performance.
 

mommasGN

Active Member
I have the baseline bolt in kit installed. My car runs 11.0s@120 with high 1.5 60 ft on 255/60s. The kit along with good shocks and a spohn anit-roll bar made a huge difference in the launch. I have only been to the track once and was halted after two runs because of no roll bar. Been thinking about a bar, but it has been a year since I was at the track. If you are making more power than I am and take the car to the track, I don't think you can go wrong with the kit. You have to do your homework and put a little thought into the set up. Below is a before and after snap shot of my set up with the kit.
Street driving is fine, I think the only thing I don't like on the street is the spohn anti-roll bar, it is too stiff for street duty. Works great at the track though.

Before Upper Control Arm Kit
View attachment 355625

After Upper Control Arm Kit
View attachment 355626


I got my baseline kit installed and all measured up. My IC lenth and height are almost identical to your chart. Taking her to the track next Wednesday to see how it feels.
 
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