Originally Posted by Norm Peterson
So it appears that the 1LE is following the "big bar/soft spring" approach relative to the SS by increasing only the bar stiffnesses. Even BB/SS tweaking affects the strut/shock valving, which we don't know anything about anyway.
Sleepy - most of the Mustang lowering springs range between about 25% and 75% stiffer than OE, and that's probably true generally. For the amounts typically lowered, that's not enough stiffer to hold the frequency of bump stop contact down to OE levels. But it is too much stiffer than OE for the OE dampers to properly control for best grip. What stiffer springs with OE damping does do is move the level of "critical damping" down toward "best ride", which may explain why there aren't very many complaints about lowering not fixed by trimming the bump stops.
Geometrically, lowering springs give something up that effectively "steals" part of the benefit that the increased rate is supposed to be providing, assuming that what you're primarily after with your new springs in the first place is more spring rate. Wanna bet that most purchasers of "lowering springs" don't think past the amount lowered?
Norm, maybe we should start calling them "performance springs" so that lowering amount will not be the only thing that matters. I think Mustang guys are lucky. They have choices like Steeda Competition and Koni Yellows. Camaro guys have Eibach Pro-Kit and KYB GR-2
. Big bar/soft spring is great for body roll and ride but it doesn't do anything for dive and squat. Suspension geometry didn't change so anti-dive, anti-lift, and anti-squat remain the same. Also, big bar take away some independent from independent suspension. I can't wait to see more reviews on this car. I think this whole sub 3 mins VIR time is mostly the tires if it is even achievable.