Shocks topping out?

 

I can measure travel up to 6.00" On full separation, they're around 5.5" They're extending about 2.5" compared to shock height at staging.

I was talking to a buddy last night who runs a foxbody as well. Comparable power levels. He said if the car weighs between 2500 and 3000, use 80# springs. If over 3000, use 110 springs. My car is 2800 with me in it, so I did order a set of the 80# springs.

 

You know how much weight is on the rear VS front? I agree- 55lb springs are light, 80lb is a much more reasonable area to be in. Did it wanna wheelie bad before with the old springs? The long, light springs in the back will really help stand the back of the car up and curb wheelies. If you’re having traction issues though, the back of the car extending 5-6” is not helping at all. It’s fighting all of your weight transfer and holding weight onto the front tires.

 

55 lb springs? On a 2800 lb car they should be seriously compressed. I would say too much compressed but I never raced a fox body. I run 110s on a 2800 lb car. The whole spring weight thing depends on what you are doing with the car. A ladder bar car is going to separate due to the short IC. What angle do you have on the bars? Uphill? Level? Downhill?

 

Do you know your a/s and ic numbers

 

No I don’t know IC and the anti squat. I follow instructions well if someone can tell me how to figure the anti squat and IC.

On the ladder bars, how do I check the angle. Is that based off of which hole the bolt is in?

My car does separate very fast.

I’ll link a video from OKC. What I see is my car hooks off of the line, but as the separation goes up, traction breaks. OKC 5/24 Run 1

 

Your IC is pretty easy. Its right at the bolt on the ladder bars. Just put an angle finder on the lower bar and see where it is at. That doesn't tell the hole story but at least you will have an idea. You want separation with the radials but I don't know about 5.5 inches just after the hit. If your bars are level or slightly uphill at rest, then imagine how they are with the body 5.5 inches higher. Way uphill. If it is level or slightly uphill hopefully you have a lower bolt hole to drop it down and try. Years ago I had a car that had the brackets welded too high in the chassis that was like that. The bars were uphill in the lowest hole even with the car lowered in the rear. We had to move the brackets down 3 inches to get the adjustability right. This was with slicks.

You are going to have to learn a lot of this so you can make your own decisions on chassis adjustment. Everyone taking a stab at you suspension online probably isn't going to fix it. Every car is different and what might have worked on your buddies car might not work on yours.

 

I spent some time calculating IC and A/S.

IC Length: 32.29"
IC Height: 10.29"
A/S % - 168.9%

For camshaft height, I used center of crank bolt + 4.914"
I have a ladder bar setup with wishbone + arb.

My car has been 1.1X in the 60" on a few tracks down south in TX and OK. This was with the previous owner. The only thing that I have changed is the rear shock springs. My tuner said they looked like 80# and he installed 55#

How do these numbers look? On the front bolt of the ladder bars, it's in the center bolt. 3 holes.

I did add my body weight to the car. About 135lb in the seat and then 70lb in the floor board.

Center axle height looks like 12.75"

When I was at OKC with my car, I had a decent run on low boost. 5.33 at 138 mph on a ramp to 15 psi boost. I ran a 1.30 60' on that run. I just looked at the data log. My rear shock sensor says that it was at 5.57" travel at 1.16 sec. I can measure up to right around 5.95"

Any input would be appreciated.

Running 275/60/15 Radials

 

The bottom bar is running 5 degrees down. The top bar is running 8.8 degrees up

 

Below are screen shots from 2 runs from last Sat night. I could not get traction for anything. 2nd run, left on 5.8 psi boost and yanked 20 degrees of timing out of it. i'll try to attach the 2 data logs from 5/12 - spinning like no ones business. Then the data log from OKC that I had a 1.3 sixty foot

 

 

I can't figure out how to attach the data logs. I can't get it to let me upload the data logs as individual files or zipping them up together. I'd be happy to share if someone can tell me how.

 

Shocks topping out?

Speed Test​

 

No - I don't believe so. I've made some changes since this and I had a pretty good night of testing in Tulsa on 8/15. Before my last run, we had loosened up the rebound on the front 2 clicks and also loosened the rear two clicks on rebound and tightened the rear up 2 clicks on compression. The separation was really good. 2.5" in the rear and about 3" in the front. Traction was good off of the line and my data log looked really good. I'm headed back this Friday the 29th to start adding in some power. Will advise on Sat how it went.