[csigler6]

Has anyone installed this Kit?

2009-Newer Challenger M9 Rear Solid Axle Sub Frame Kit! - Moser Engineering

2009-Newer Challenger M9 Rear Solid Axle Sub Frame Kit! *The Moser Engineering "Challenger" Rear Sub Frame Kit!Fits: 2009 - 2010 - 2011 - 2012 - 2013 - 2014 - 2015 - 2016 - 2017 - 2018 - 2019 Challenger*Kit ships within 3 weeks of online order completion!The standard kit includes the...

www.moserengineering.com

 

[Himmelkat]

The constant-camber guarantee and the removal of a lot of the potential for bunged driveshafts and half-shafts would be a big plus.

The lack of adjustability for the gain rate on the pivot behavior of the rear axle would potentially be a minus, as racers, when allowed, have moveable front upper and lower holes for the four-links they have installed, to change how aggressively the car slams down on the rear axle or refuses to rise on braking, as a side effect.

I see that it has a sway bar and dual shocks, so the usual complaint of ladder bar-type rear suspensions is eliminated: car can't roll on it suspension very easily at all.

It is an interesting setup, to be sure, with a pair of links on the ends that are height-adjustable while the center link is not.

What is a weak point, structurally, is that the lateral movement of the rear end is not limited directly to the axle itself, unless that is hidden, but at some point midway up the large central link, which could lead to bending and misalignment. It does seem strange, in that professional racers and Mazda (RX7 first generation) have used right-to-the-axle Panhard rods and Watts linkages.

It looks functional but complex, and strictly for racing, and that strictly quarter mile, but it being removable, scar-free, would be a big plus.

 

[csigler6]

Thanks for your input Himmelkat!! I appreciate the help.
The car is 90% drag strip and 10% street. It has a 15 inch brake conversion, AAD control arms, Santuff dbl adjustable shocks and a Ford 9 inch rear diff set up by G-Force Engineering.
I have broken several driveshafts (usually the u-joints), control arms, control arm bolts and the sub-frame has shifted a few times. The car runs consistent 9's with my best at 9.5. I have pulled power at the launch but that didn't help. I know 4 link would be best for the strip but...$$$ and don't know about drivability on the street. Do you think the Moser kit will help with launching the car?

 

[Himmelkat]

Without a doubt. It looks as if it simultaneously locks the rear end from doing weird changes of angle on multiple axes unlike the stock street compromise of stress plus suspension bushing deflection. With its adjustability, I would hope you could dial in the amount of rear anti-squat you wanted, so all or much of the force on launch was going to compress the rear slick sidewalls, not the rear springs, which is wasted motion and reduces force on the tires, downward.

For an indication, watch a 1970 Chevelle accelerate. You will notice the rear end RISES a bit on throttle application due to its suspension design, so the geometry is providing anti-squat, much like a shaft-drive motorcycle, some of whom rise substantially in the rear on acceleration, such as the old Virago.

Now, for road racing, anti-squat is a metric that they dial in carefully so it does not provide negative behavior when NOT accelerating, but it is somewhat simpler with a solid axle, basically turning pumpkin torque into resistance to upward motion on acceleration, and resistance to downward motion on braking.

 

[csigler6]

Thanks Himmelkat!! I very much appreciate your help!!

 

[Himmelkat]

You're welcome. It is nice that someone has a bolt-in availability for the serious quarter-mile aficianado that enables a reversible capability to use a solid axle.