24 R Violent Bouncing On Launch

[agent_ara]

Hi everyone. I have a 24 R (6,500 miles) with the full suspension offerings from M26 Engineering. Including UCA, Ford Live Valve Sensor Rod, 2" Perch Collars, Rear 4 links, Pan-hard Bar along with 38" Nitto Ridge Grapplers with Innov8 G500's. I have two problems I'm dealing with; 1. When I put the truck in Sport Mode - 4A and launch it from a dead stop the front end starts bouncing up and down very violently. 2. I was going about 60 on the freeway and i punched it, the truck started whipping left to right (this felt like it was coming from the rear end.) My thoughts are maybe the tires being about 20lbs heavier than stock are contributing; also being that they are 38's. Another thought i had was maybe the Live Sensor Rod they sell with their UCA is causing problems. All the parts can be seen here. None of this was going on when the truck was stock. https://m26engineering.com/m26-offroad-shop Greatly appreciate everyones input. Thank you

 

[Nex]

Welcome to FRF.

Did you recalibrate the suspension after the work was done? 38s have a lot of sidewall and do wonder a bit on the street. (I could feel it on 37s with my Gen 2). What are your tire pressures set at? Has the sway bar been removed?

 

[agent_ara]

Thank you! Tire pressure is at 48. The shop told me they took it in to Ford for ride height adjustment, but I'm not sure. How exactly is the recalibration done?

 

[Nex]

48?!? Holy fυcκ! Do a chalk test. Most run 34F/32R on pressures. I ran 32/30 on my 37s.

Get forscan and you can calibrate it yourself.

 

[agent_ara]

The shop told me to keep them at 48 for 5k miles. Not sure why. I'll drop them down and see how it goes. I appreciate your help.

 

[Nex]

I just realized you are running perch collars. You might be running into the travel limit on the front shocks. But I'll let those that have run them give you advice on that. It just seems to me that your suspension is set too stiff (giggity). That would be fine for your track car, but not a thropy truck.

 

[GCATX]

Maybe turn off the traction control and all the nanny's? With that tire pressure being high, who knows.

Wish my wife would go up and down violently like that.

 

[agent_ara]

HAHAHAHAHAHAHA! I've tried turning traction off. Didn't help. I'll drop the pressure and see if it helps. thank you

 

[Roush2568]

Way to much tire pressure.