If I understand correctly adding rebound will actually soften the hit on the tire
Correct?? I’m using a Transbrake and a set of menscer da socks
When I leave at a lower rpm everything is good ( 1.39 60 foot )
But hard to cut a good light and I as expected as I raise the two step
The 60’’s slow
I would load a video but guess I need to work o that also
I’ve added compression almost to point of being out of adjustment
And not much of a change
I ran out of time last time out before I got a chance to add rebound
I know this had been beat to death and I appreciate anyone sharing
There knowledge/experience
I’m guessing menscer has been busy with lights out 10
Because they haven’t answered there phone in the last week

Tightening the rebound/extension on the shock will slow down the rear housing, thus not pushing the tire as quickly or hard into the track surface. Loosening compression will not help much if you cannot control the hit on the tire. To over simplify it extension will control the hit and compression will control how long it stays there. Lots of factors play into this, suspension type, track conditions, power level, rear tire type etc

At this point the slow motion videos show the tire
Being hit hard and fast then the pressure is released
From the tire Not much and it’s not blowing the tire off
But slightly slipping
I’m right on the verge of getting it right
Sounds like the rebound adjustments may be the
The Ticket

So many factors involved - suspension type and geometry (IC), power/torque, stroke, gear ratios, tire type, car weight, stick vs. transbrake vs. footbrake, track prep....

All of these factors determine what the housing is going to do when the torque hits the pinion, the shock controls how fast it's going to happen.

Rebound affects the initial hit, bump affects what happens after that initial action. These affects can be observed by videoing with at least 30FPS, 60 is better, and watching it frame by frame. Much of what you want to see happens before the car moves a foot or 2.

My advice - run the shock as tight as you can. Some tracks can be rough to the point where tight compression settings will upset the car, and the settings become a compromise. High and low speed adjustable or electric shocks - where they are tight initially, then are softened after the car leaves the starting line - are being used more by fast bracket, pro tree guys these days.

Good advise above, you are on the correct path in tightening the rebound. I'd put the compression back where it started as well.
Doug

Not really seeing much separation maybe 3 inches or so
Give or take a inch

Is this a ladder bar car?

Caltrac’s and Transbrake
And your rhs heads

Caltracs then tighten the suspension as tight as possible. Would not be surprised if you have a decent amount of power that you will need the shocks at the very least revalved. More info on the combo is a PLUS

If you raise the RPM (make it more aggressive) and it slows down tighten the shock to control the housing. You don't want to punish the tire, just manage it.

If you run out of clicks before the car shows you it doesn't like the tighter settings, or it's still separating like that with the shock dead tight, then it's time to revalve the shock.

It’s probably making 550-580 maybe not real sure
2990lbs with me in it
408
904 with a 8 inch convertor 5000
Transbrake
4.56 gear
Complete Caltrac’s system with menscer shock
Best to date pas leaving at 2200 rpm
Is
6.44 @104.5 mph
With a 1.39 60 foot

I just check my rebound setting and I’m 14 from full tight
And I have a touch of preload
I also have Viking DA coil overs in the front

Share that vid,it will be informative!

Tighten them up first thing...

Maybe some already asked, but is this slicks, or radials?

Slow motion 1.19 60ft . With the same shock that you mentioned Outback.. oh and I would look at the front of the car https://youtu.be/ddVLS0nreuM

Slicks with tubes
I’m still having trouble loading the video not sure why it’s being a pain
But after the index race on this Saturday
I will try get a few test passes with the shocks tightened up
Likely will not make it past the first round

I’m a novice at best with this stuff, but that video looks to me like you’re controlling the extension pretty well. It looks like the axle rotated some by watching the wheelie bars, but it’s not extending/separating much at all. I do see a little bounce in the car just after the hit (about 3 tire rotations out), but it again doesn’t appear to be reflected in the axle position relative to the car. Smart guys are here to reel me in if needed, but it looks to me like axle rotation may be your issue, not axle extension. With this in mind, I might suggest to look at preload on the bars more than shock setting (??). How much preload is in them now, and what hole are they in?

My opinion is you need way more rebound/extension stiffness on the hit. Way too much movement. You can see it more in what the bars do than looking at the tire. All that movement is crushing the tire on the hit.

A set of shocks with a starting line feature, where you can lock the shock up on the hit, and let go of it .9 or more out would be beneficial IMO.

Guys the video you are watching is from a car that works
And in completely different league then mine
I can’t load and videos not pictures of mine
But after reading the comments I have an idea of what I need to do

I will run the front on full loose
And adjust the extension to full tight on the back and back off if needed
Roughly 3000rpm off the Transbrake
And see if that will work I feel like it will do the trick
And if not I will get with menscer see about revalving the shocks
Thanks guys
Just needed to get it put into perspective

Do NOT run the front full loose. This will create yet another issue. It'll transfer, top out the front, then unload the rear. Seldom does the front ever need to be full loose. Some apllications may need more front travel (nose heavy or very poor track).
Doug