Where are the shocks set compression and extension?

Donald

I think the prep was good on Sunday. New best ET, 8.88 and 60 ft, 1.22, on first time shot. Video is from 2nd time shot.
http://photosbyjim.smugmug.com/Competiti...51_msPRgw3-A-LB

It could work good in the heat but may be borderline and when track temps go down…

Time to change the setup. You have alot of horsepower and I'm sure once it hooks it works the suspension, but the suspension just doesn't seem to be working in the cold.

If the front is full loose, nothing to do there. You can try hitting the tire softer by moving the IC out and down a hair.

I agree with B1 also and would take a couple,4,8 degrees out in first gear to get it down through there.

Also take a .5lb out of the rear tire and see if it helps.

Your video is excellent and definitely helps. I have to get a camera man next year. Its nice to see what its doing besides relying on the racepak or the seat of the pants...

Have you checked the wear on the rear tires to see if it's even across the tread width? I would have to say that it does look stiff for some reason. What gets me thinking is that it works when it's hot but not when it's cold. That could be a tire issue. Have you only used the M/T's or have you tried a softer compound in a different brand? Your car is pretty fast and most tracks I've run on would have a hard time holding that consistently.

Have you played with the pressure at all? Your videos don't show the burnout, maybe when it's cooler you need to do longer or shorter burnout. Lot's of stuff to try.

I know this may sound crazy but I have heard guys getting between 8 and 20 passes on a set of tires. From what I have been told your high HP cars break down the sidewalls very quick, you my want to call the tire manufacture and see if they have any ideas.

I am not familiar with cars that run better than 1.2+ 60 fts, but will offer what I see. Looks to me like you nailed the setup for a fast surface/best scenario but this day was much different. By that I mean the rear suspension is not hitting the tires, you use torque and available traction to get needed weight transfer. The surface won't handle the hit without a softer rear shock and shorter IC , or maybe one or the other. Same with the front. It didn't even try and rise.
You might have to start with a setup that will handle this type of track and see just how much that setup will cost you on a good traction day. You may be able to leave it close to the same settings, maybe not. But it should have at least let the wheeliebars touch the track on the hit, IMHO.
What was the track temp?

i would try at ATCO if the car dont hook there,then theres something wrong etown track prep is poo poo.. good luck Bobby

Well from what I see in the video the rear suspension is doing nothing at all. I agree with some of what has been posted already. You are going to need to loosen the rear shocks on both extension and compression and IMO a four link adjustment woulg be on my to do list. Any idea what the IC and hieght is now?

My junker was doing similar things on cold tracks-vs-hot tracks although not to that extent. I was having a problem "holding" on to the track on cold days. We found a 4 link setting that works well in both, with a much shorter IC than before. now we just make adjustments to the shocks for varying track conditions/temps. I am not as quick as you but 60' but in the 1.teens on a good day at sea level and can go 8'ohs.

Would love to pick your brain a little on the 99 hemi thing.

Oh yeah BTW I think your problem is to much wheelspeed

Well actually after watching it a few more times in the second video it appears like it is trying to hit the tire but loosing it quickly. Did you make any changes between that first video and the second one? If so what were they? In the first video it really appears as if nothing is happeneing n the rear.

It also appears to be hitting the tire at the 6 o'clock position, not farther forward. But as i said it definitely did not stay there. Perhaps loosening the compression a few clicks may have helped keep it planted better.

Have you loosened up the compression to help keep it planted? There is a slight downward movement to the wheelie bar and a little wrinkle of the tire before it goes up. I still would look at moving the IC closer but woudl be curious to hear exactly whats up with the rear shock settings. What shocks are they and what springs? Could be WAY to heavy a spring but I doubt that is the issue.

Al, from my experiences, shortening the ic seemed to hit the tire harder. Maybe, I'm wrong, but out and down was definitely softer on the tire.

I do think your assesments are dead on...

temps like that can have a huge effect on shocks..its making the settings on the rears act much stiffer.
plus the motor is making more steam with cooler denser air.
im with greg move the bars to hit the tires harder .
sans making physical adjustments..
short term/or in a pinch..you could try to run the car up and down the retrun road or over some bumps and put/get some temperature in the shocks before you stage..see if that does anything.

For some reason he hasnt said the 4 link IC... but from
what I have seen a longer IC will tend to lift the front
more and the lower IC will sustain the hit longer,
also pushes harder forward.... and shorter IC lifts
the rear of the car... higher IC hits the tire harder
and for a shorter period of time...about the optimum
point is right around the CG or slightly behind it
then its a matter of how high...I only get a 1.19 60'
so his car is out of my comfort area..... JMO

really not sure of 4 link IC i have to find out and let u know

Well it is kinda all speculation at this point since we dont know where it is now. Or the weight bias of the car. At any rate something needs to change or is broken, binding or just not working. I think we could all use a bit more info for sure.

Is that a wishbone on that four link? check for binding! My friend had that same issue and his wishbone was literally seize!