New setup is 4.10s with a tru trac, relocated qa1s, removed middle leaf, assassin bars, and 275/60/15s. Truck just isn't hooking on the big shot no matter what adjustments I make to the tire pressure or shocks. I got it to stab a 1.59 60' one time but the bottle ran out about 100' out so I'm thinking it must have been really low bottle pressure and a small shot. Had a friend take a vid for me which is what the you tube link is. What I'm having to do now is launch, it spins, let out, get back in it and it'll go 1.80 60'. for the video I stayed in it as I wanted to see if it was unloading the tires or what was going on and it spun 1-2 and cut a 2.01
I really don't think at only 550 at the wheels I'm over powering these 275s but if that's all it is, I'm more then happy to switch tires.
Any suggestions are appreciated!!!!


This is slow motion of same launch.

 

Youre nowhere near the limit of the tire. What are you brake stalling to? Try flashing it to hit the tire harder. The *** end is already lifting before you launch. My best 60' on that tire was around a 1200 brake stall.

Loosen all bolts to where the front and rear suspension moves freely. Without shocks in place it should bounce uncontrolably.

Assuming tire pressure is around 18 psi?

If a lower brake stall doesnt hit the tire hard enough, angle the front side of the traction bar up further. What exactly are your shock settings on that run?

 

Actually, before someone else asks, post up all settings on that pass. Tire pressure, shock settings, bar position, preload, and launch rpm. You said 275, does thT translate to 275/60-15?

 

Tire pressure was at 18 psi and correct, they are 275/60/15 about half tread left. bar settings were top front on the front leaf and top rear on the rear and the bars have an angle up in the front due to having lowering hangers set at 1" drop.
Shock settings have been from 0 (softest) all the way to 8 and getting worse as I got stiffer.
I tried everything with stall speed. Off idle, 1200, 1500, and even 2500.
i just adjusted the bars to the low setting in the front spot and now have a slight angle down in the front and plan on trying that Wednesday but really doesn't feel any different (at least on the street)

 

Here is another video from the same night. This one letting out and getting back in it.

 

Truck moves damm good bro.

 

how did you load them. Sloped down will hit even softer.

Wish you had da shocks, but singles can work.

Have you tried bottom hole on axle and top on hanger? Shock somewhere in the middle to firm range...

 

What do you got going on in the front? Loosen off the control arm nuts (can add a second nut as a jamnut to make sure it don't come apart), grease the **** out of everything, even shave off a little of the bushing. Full unbinding travel is the goal here. Front shocks? Second-gen Camaro shocks are the exact same as stock height 2wd truck trucks if you go shopping. Sway bar disconnected? Drop springs? Drop springs suck for transfer.

Slo-mo vid looks like the truck is lifting the right side a little more than the left, or the left is squatting more.

 

I would want to know what your doing to preheat the tires. That may be your only problem. How much tread depth is on them. How are you doing your burn out? Your tires don't seem very sticky in the video. After your burn out the tire pressure rises you know. Setting then at 12 psi start, a nice burn out will raise it up 2 psi +. Every combo is different

 

4wd problem solved