I'm only running the rear H&R bar. Highly recommend it. Huge decrease in body roll. These cars do need stiffer springs though, stock is 7 kg/mm. Going up to 8kg/mm it's much better.

 

I got front and back, front on soft, rear as stiff as possible. For my money next time, ill just put on the rear.

I’m a crappy track driver so I struggle to rotate regardless. Skills gap . Next track day I plan to run the rear tires 3-5 psi up to see if that helps

I think of this car as FWD. the rear only goes to 50% and when my car was on the dyno we failed to get a baseline because the rears just wouldn’t engage (but did fine tuned?) and we couldn’t get it in dyno mode soon enough for the alotted time. Regardless, my learning lesson is this car tries hard to stay off rear power.

 

There's a dyno mode?

 

Absolutely. Locks the diff to 50/50 so you can get the dyno rollers moving together.

otherwise the car thinks it’s slipping and throws alarms for traction loss and cuts power

 

See ...

 

I don’t remember how much turning will kill the mode. I do remember being in the parking lot after dyno and figuring out how the heck to get it in that mode, then drove off.

It canceled out of the mode just about immediately. I assume it knew from wheel position I wasn't on a dyno at that point

 

Anyone know if 4matic throws a fit if a rear wheel lifts of the ground?

 

I'm going to say "no" (as in, I don't know), BUT. with the swaybars in my car it's strung up so tight that on certain driveways I do 3-wheel out. I haven't gotten stuck yet but the wheels do tend to lose traction if I sit only on 3.

I say 'no' because I've never really observed what's going on coming out, I just feel one wheel lift followed by another wheel losing traction and spinning as momentum carries me over the threshold of the driveway and back on all 4 which hookup right away.

Also not sure how stiff our cars are from the factory, but when I jack up one jack point, the whole side of the car does lift off the ground if I jack high enough. it does go back on 3 wheels when I put it down on the jackstand.

 

Ten years ago there were several videos posted here of 250s going over transitions that lifted a wheel and got the vehicle stuck spinning only that single air born tire.

The 45s with Race option did not have this problem.