Anyone have some good results finding appropriate Instant Center (IC) on their '69? What did you find out? What equipement did you install and where ..did it have noticeable results?

I don't have wheel hop. Zero. But interested in this Instant Center concept I read about. I'm reading Dave Morgan's book on Chasis tuning, as well many articles on the internet. Looks like the search for improved IC will lead me to replacing and relocating the lower control arms??? And, reworking the location points of my uppers? Can you enlighten me? Presenetly I have boxed lower stock control arms, and new adjustable Edie Uppers.

I just got rid of most of my drive line vibration under acceleration by adjusting the pinion angle, down some, using adjsutable upper control arms. I have poly bushings all over, and boxed lowers. I have a a mostly stock, original motor and car - 12-bolt 3.55 rear '69 4 speed, M21, and sticky drag radials.

Going back to the strip next summer - test and tune nights - only been there once since finshing the restoration and learned I had a lot of work to do ... Ha! before I went back :) .. geez it's a heavy car no wonder they put a big V8 in it ... just to haul is lard but around ... I'll probably leave the seats home, uncork the headers, take off the front bumber too .. maybe a fiberglass hood ... H-m-m-m-m-m I have some paint left over ....

P.S. I did do a search: before I asked :):):) ... saw three posts and will go back when server is not "Too Busy"

I think I understand? Have spent most of my life around the strip but mostly with rails so I am a little green on this subject. What I would think you would do is measue height & fore/aft location of all pivots, the axel etc, then lay it out on a drafting board, draw the centerline thru the pivots to extend them forward until they meet, and that is your IC.

Basically the Dave Morgan book is the bible. First set your car level and take angle measurements of your top and bottom bar and plot them out. This will give you the imaginary intersection point of the bars. Then the trick is to balance the car on jack stands to find the center of gravity. If I remember correctly it's usually the height of the camshaft centerline. Then you see where your intersection point is in relation to CG and then you can work on moving the bars. It will be like you said either raising the back of the top bar or lowering the back of the bottom bar. If you have the book it will give you much more info than I can remember off the top of my head.

Go to Performance Trends:

http://www.performancetrends.com/4link.htm

This will show you exactly where your instant center is.

Ron