Hopefully one of your guru's would be willing to help me get to the bottom of this. I had a chance to drive a similiarrly prepped Evo mid-last year. It was one of the most well balanced, neutral and easy to drive cars I have ever had the pleasure of driving in. It was at that point I knew there was something terribly amiss in my setup. Here are the stages I've gone through in an effort to get my car there.
Original setup - 2011
Stock sway bars
600f/800r spring rates.
Excellent rotation. Good toss ability and point ability. Average to good in transitions.
Worked great right up until Lincoln Spring events where the soft rates and ride height had us bouncing off the bump stops and rolling over like a stock car.
Stage two. - 2011
Up rates to 750f/900r
Revise ride height to mimic other SP evo’s. With some slight rear rake.
Rotation reduced. Toss ability Reduced. Point ability increased. Good to excellent in transitions.
Overall the car felt way more planted. But at nats had a terminal under steer that resulted in decreased performance.
Stage three – 2012
Up rates to 900f/1000r
Upgrade front and rear bars to stiffer units.
Change front camber from -3.0 to -3.5 degrees camber.
Change rear camber from -1.5 to -2 degrees.
No push. No Toss ability. Excellent point ability, but washes out past turn in. Superb in transitions.
Still very planted. But doesn’t want to do anything more than go straight.
Replaced front helical diff with Quaiffe unit.
Rebuilt rear diff.
Still no help.
Did test event at local venue with the 9.5” wheels and 275/35/18 Continental Cup tires and it transformed the car. It was all of the good and none of the bad.
Car was still not as compliant as I’m shooting for. But had the overall balance I was looking for.
I have dyno'd my shocks VS the ones on the other car. And by the numbers I have vastly better valving, range, everything. But still feel like my car lacks the compliance. And still doesn't have that smooth mid-corner balance we all dream of.