https://youtu.be/1H3bCkPQVMM. Hope the link works but this was taken on a cell phone. After going to a Bob's profab kit with afco double adjustable shocks shocks and 250 lb coils my car will not transfer or rotate the weight to back like I want. Rear shocks are QA-1 single adjustable with 150 lb springs with ladder bars, bars are leval with the car. I've adjusted the front to full loose and rears from stiff to full soft. It use to 60 foot in the 1.39 to 1.41 average now with changes I did get a 1.35 out of it but I feel it chattering the rear tires. I've tried calling Bondo Bob but will not return my calls for help. any thoughts on getting the car to transfer a little better?

What exactly are you trying to get it to do that it's not

Being a A-body those rear springs are too stiff
so the design length on the shock will be way to
long.. measure the design length.. its not separating
the body(lifting which is planting the tires).. you want
just enough spring to hold the body up.. about 110-120
depending on the rear weight

.

Monte, this launch is footbraking it and with the TB it spins. My car use to stick the front up about a foot off the ground and dead hook, with the new coil over front end it seems the car is bound. This front end is much more stable but I put another 100 horse or so and a brake. I just can't understand why it doesn't pull the front a little higher and help plant the rear?

Of course it's separating, you can see it in the video when he brings the motor up. Probably raises the body an inch. I agree the spring is too stiff, but that don't keep it from separating, unless the shock is completely stretched out, which it doesn't appear to be

If it needs to hit the tire harder, raise the front of the ladder bars and maybe some more air. What tire and what pressure. The front way loose is not going to be what it needs.

I agree that your rear springs are too stiff. All ladder bar cars separate, that's just what they do, but a softer spring will give you some stored energy and let it separate easier if that's what it needs. You probably need a better rear shock as well.

Without seeing a video of a brake launch, it's impossible to say...........but I would about guarantee it is NOT blowing the tire off at the hit. It could actually be hitting the tire TOO hard and topping the front out, which will make it spin instantly.

You say you have 100 more hp and a brake. That will definitely hit the tire harder than it did. I know you changed the front and now it won't work, so that is where you are looking, but doubt that is where the issue lies.

Contrary to popular belief, the more power you make, the LESS aggressive you need the chassis. More power works current chassis settings harder.........so, if it was dead hooking before, it may be punishing the tire now

I am down to a 220 spring on the front of mine. 3.5 of front seperation.

I was told a notable mopar guy runs a 14" 180 spring on a 12" shock

IMO, on the hit your not getting Near enough Rear separation. Your front suspension is to loose and popping to high up then rebounding back down causing you to spin.

So, IMO you don't need a looser front setting. From the vid it pops up right now and bounces several times while unloading the back. I think you need to promote rear separation. The front needs to come up more gradually and smoothly. Next time out can you get a vid from the other side too.

just enough spring to hold the body up.. about 110-120
depending on the rear weight

[/quote]

Mr P, the rear springs are 12" and 130 lb, not 150. I'll take pix of the shock settings & post also.

Def way to much rear spring...One thing to consider is the converter in the equation. IMO the video quality aint helping me at all, but hey I'm old. One big issue with those front coil coversions is way to short a shock, not enough travel IF you need it.

Here is where I have the fronts

Rears

I agree, it does separate when he brings the motor up. Cant see it raise after that on launch, looks likes it remains level or almost squat. Not a really clear vid though.

What is your front end weight?
Mike

I don't have access to scales right now so I can't give you a good answer. Before I changed to the coil over kit it weighed 3150 with me in it. Here's a pic of how it use to leave before Footbraking.

If the car is sitting where you want it........judging by pics and spring platforms, the rates are fine.

As far as how it leaves, do you WANT it to carry the front high, or you just think it should.

My main concern is is chatters the tires on every launch only footbraking. My feeling is it not rotating up enough to stick the back.i can't use the brake til I get it to stick footbraking. Although the front coming up like it use to would be a plus, I just can't understand why with more power, a brake, and the converter adjusted to the new power it will not stick. I've only got 10 runs on this combo so I'm adjusting most every run.

Small block car?

No, low deck big block.