Hey guys,
Time to pick some brains, as you know we only have few runs on car with 4 link and need some advice car weighs 2947 with me, 50.3% on rear 116 inch wheelbase cg is 20 inches, right now 4 link is set 58.8 out 9.4 up and 93% antisquat. 60' are not great 1.26- 1.30. What would you set 4 link to
out height antisquat
40.1 5.85 83.2
40.5 7.7 110.2
41.1 8.5 119.9
41.1 7.5 105.7
41.2 9.5 133.3
41.7 10.3 143.9
41.7 9.3 129.8
42.2 11.2 154.7
42.3 3.8 51.9
43.4 4.5 60.5
44.3 5.4 70.7
44.3 5.4 70.5
44.8 6.3 82.1
45.5 7.3 93.3
45.7 8.3 105.5
45.8 7.2 91.5
46.2 9.4 117.6
46.3 10.4 129.9
46.7 11.5 142.7
46.7 9.2 114.8
48.3 2.7 32.6
49 5 58.9
49.5 3.7 43.5
50 7.1 82.7
50.2 4.6 53
50.7 9.4 107.2
51.2 5.8 65.2
51.3 11.7 132.5
51.5 6.7 75.8
52.3 8 88.9
52.5 9 99.5
53.1 10.4 113.5
55.5 2.9 30.6
56.7 4.3 44.1
56.9 5.3 53.7
57.9 6.8 68.1
58.1 7.8 77.7
58.2 0.9 9.5
58.8 9.4 92.8
Dave Morgan recommends 46.7. The car makes 900+hp and 850 fttq with 14 32 MT tire.
John

if it's hooking and going straight I doubt screwing with the 4 link is going to make it better. a 1.2 60' is not bad for a 3k pound car imo. maybe some converter tweaking may help more.

We are having problems with hooking up. sometimes it hooks and others it blows tires off the car. But car is going straight as an arrow.John

I would pull it back some... like the 46.7 9.2
EDIT
if it didnt work good there then I would start going
out to 48, 49, 50

what kind of shocks front and rear? what front suspension?

Strange strut front end with 3.5 inch travel 350#, the back is strange single adjustable with a 150 # spring, anti roll bar is set neutral. 1 degree pinion angle. John

I would pull it back some as well. But that is just me. Also think you have a bit to much spring back there for the weight.

with the other guys but with that kind of power I doubt the strange single adjustible shocks will get the job done. 150# springs is way to much imo also.

Yeah those rear springs are stiff... might be better
off with a 130#

I rechecked rear spring is a 130, sorry for confusion. I think down at sgmp we will set the 4 link to 46 and 9 setting Mr P said. John

you need double adj pronto..... you MAY even have to go to a 110 spring. Easiest way to check for correct spring rate is to 1. Remove the shock from the car and loosen the spring platform til the spring rattles on the shock. 2.Measure the free length of the spring. 3. Then tighten the platform down by hand til it takes the rattle out of the spring. 4. Now compress the spring 1" and 1" ONLY !...then lock down the platforms. 5. Re-install the shocks on the car....with the car at race weight (driver inc) measure from bolt center to center on the shock. Now check this measurement compared to the shock manufacturers spec. If the bolts are too close together...spring is too soft.....too far apart...spring rate is too stiff. DO NOT adjust spring platforms to adjust ride height....if you have that MAY be causing the issue your having...ALL Springs are designed to operate at 1" from their free length....if you compress them you are ruining them and affecting your set up.

Thank You Chassisman I never knew that,we will check that out at SGMP on Friday, when I reset the 4 Link. John

I would think 110 would also be a better choice. IMO the 150 is WAY to much spring.