Cal Tracs and Instant Center????

3pedals · 07-22-2011, 01:04 PM

I have a set of slide-a-links on my 67 camaro, that I have modified to have a solid rod at the bottom to be like cal tracs. I have measured and roughly calculated using the main leaf as the upper link, that the IC is at about 78" in front of the rear axle, and about 5.5" off the ground. I beleive the neutral line on my car to be at about 9.5" off the ground at the same 78" in front of the axle.
1/2 the people say the cal-tracs dont effect IC, that the front spring eye IS the IC, and the other half say that YES the cal-tracks do effect how the rear suspension reacts to the "hit" just like altering a car's IC, and pivot point adjustments DO effect change.
What do you guys think????
If the cal-tracs do effect it, then where should I try to get the Instant Center. I know that I should have some anti-squat in the IC setting, but unsure where to attempt to position it, I have to modify the pivot points to acheive this so I am looking for advice.
Please dont tell me to spend $350 bucks and buy the CAL-TRACS, I would like too, but I have already wasted $350 on the slides inks, and I dont have alot of spare cash. I know I can modify the pivot points on the bars I have, to get them to work, I just need the technical advice about IC location.
If anyone has any other leaf spring setup advice, please share it
This on a stick shift 67 camaro, 6.0l LS, stock suspension, 28x 12.5 ET street bias. Car weighs 3425 roughly with me in it and has run a best of 11.39 @ 120 w/ a crappy 1.60 60 ft. I really need to improve traction to get it to 60ft better. Slow speed video of the launch shows the rear tires turning about 8-10 revolutions before the car even moves, and the rear does not separate untill after the tires start to bite.
Barrett

07-22-2011, 01:04 PM	#1
3pedals Junior Member Join Date: Oct 2006 Posts: 10 Likes: 0 Liked 0 Times in 0 Posts	Cal Tracs and Instant Center???? I have a set of slide-a-links on my 67 camaro, that I have modified to have a solid rod at the bottom to be like cal tracs. I have measured and roughly calculated using the main leaf as the upper link, that the IC is at about 78" in front of the rear axle, and about 5.5" off the ground. I beleive the neutral line on my car to be at about 9.5" off the ground at the same 78" in front of the axle. 1/2 the people say the cal-tracs dont effect IC, that the front spring eye IS the IC, and the other half say that YES the cal-tracks do effect how the rear suspension reacts to the "hit" just like altering a car's IC, and pivot point adjustments DO effect change. What do you guys think???? If the cal-tracs do effect it, then where should I try to get the Instant Center. I know that I should have some anti-squat in the IC setting, but unsure where to attempt to position it, I have to modify the pivot points to acheive this so I am looking for advice. Please dont tell me to spend $350 bucks and buy the CAL-TRACS, I would like too, but I have already wasted $350 on the slides inks, and I dont have alot of spare cash. I know I can modify the pivot points on the bars I have, to get them to work, I just need the technical advice about IC location. If anyone has any other leaf spring setup advice, please share it This on a stick shift 67 camaro, 6.0l LS, stock suspension, 28x 12.5 ET street bias. Car weighs 3425 roughly with me in it and has run a best of 11.39 @ 120 w/ a crappy 1.60 60 ft. I really need to improve traction to get it to 60ft better. Slow speed video of the launch shows the rear tires turning about 8-10 revolutions before the car even moves, and the rear does not separate untill after the tires start to bite. Barrett Last edited by 3pedals; 07-22-2011 at 04:27 PM.