Where is your IC at? You should use an IC calculator, like Performance Trends or similar, or go to Baseline Suspensions and us the IC calculator they have on their website.

Instant Center Calculator for your drag car suspension

Calculate the instant center on your drag car suspension geometry.

www.baselinesuspensions.com

Put all the 4 link measurements in, so you have an idea where your IC is in relation to the CG and neutral line. All the other stuff is meaningless without it.

 

Sweet, I’ll get out the tape measure tomorrow.
Thanks

 

Got the tape out...

 

Hey I think your CG is off.....31 inches? Is that right?

 

It’s a pick up truck, I went with the center line of the cam shaft.. overhead cams.

 

The crank center line is 18” add 6” like a push rod V8.
Makes the CG 24”

 

That looks a little better. With a 31 in CGH I don't thing you could ever get above the neutral line to get some anti squat to hit those drag radials. Have you run it like this? Hopefully some drag radial guys will chime in. I never fooled with drag radial setups. Just slicks.

 

Haven't run it yet, just had the 4 link installed a few weeks ago.

 

Need get that AS up in the 130%-160% range. I would raise both bars in the front and see what that gets you. Can you post a pic of your brackets?

 

That is what I was thinking but it looks like he still might not get much above 100 percent, if at all. Hopefully the uphill angle of the bottom bar helps it.

 

the performance trends 4 link calculator is bad ass, also gives suggestions on where it needs to be. It took me a couple hrs to put in all the measurements but once it's done you can see all possibilities for bar angle.

 

Much Appreciated..
I can raise the bars up in the front., this setup is close to where I took the measurements.

 

Nice setup. I would defintely drop the bottom bar to the lowest hole on the rear housing, and raise the front of the bottom bar at least one hole, and maybe 2 if you need to. If the top bar isn't already in the hole closest to the housing in the rear, put it there and see what the number is. May not have move the top bar in the front to get what you need, I hate when the spread starts getting real close together in the front. Even minor changes in ride height can change the anti squat quite a bit, so make sure it's where you want it.

 

I put the upper arm in the hole closest to the rear housing and raised the front hole by 1
Lower arm I put the arm in the bottom hole and raised the front hole by 2
Im above the squat line.., is the instant center length too short?

 

I don't know if I would worry too much about the length, so much as I would that bottom bar angle. Its running uphill 2.75 inches..... Maybe some guys that are familiar with them can comment on that. If you over do it sometimes its not good.

 

I would try and get at least some weld on the inside edge of those 4 link brackets on the housing. I'm about 166% anti squat in my Chevy II. From the pic, it appears you'll want more lower bar angle. Up on front holes.

 

Yes, I would go up yet another hole on the bottom bar and see what the number is.

 

I got some more gussets welded on the brackets today..
I raised the lower bar up another hole.