The problem is the 600 spring will give a poor ride under less stressful profiles and so you go for a 450 and then use a bump stop to artificially increase the spring rate as it nears the limit of travel and also design the mount so that should you run out of room, it can take the blow.ĥ Spurs KR armrest extension - EBay door striker covers black plastic - Craig's Custom removable front license plate bracket - ZL1 Add Ons Deluxe stone guards - Velossa Tech big mouth, both sides - Cervini’s C series grills, upper and lower - 2018 stock GT air box and intake tube - AFE drop in dry filter - Heatshield Products 140014, intake manifold heatshield - 2018 AFS Ported Intake - MMR imrcv lockouts - Ford Racing LU47, injectors - JLT 3.0 pass. ![]() If you fix travel at 3" and rate at 400lb/in, at 2" you need 600lb/in to balance. That is why the sacrificial direction of the OE mount is to blow out the top, not the bottom of the assembly.įor best suspension action you want the longest possible travel with the lowest possible spring rate but modified by expected force profile (2" square bumps being the typical max for calculation purposes). Hard bump stops like the Ford OE don't dissipate enough energy before they go 'solid' which drives the rest of the energy into the wheel well sheet metal in an effort to lift 900lbs of car at those 2 bolts. Tuning, trimming, or selecting bump stops and their effects on bumps, or hitting pot holes is entirely a compression stroke matter. When you lower the car by 1" you're now asking borderline "the impossible". (have to go find my calculator for more accurate numbers). Remember the spring and damper is trying to absorb a ~80lb mass traveling at something around 2 meters/second all within 3 or less inches of travel. However rebound is a 'smooth', slow, relatively low energy motion and rarely a source of structural problems. ![]() If the suspension is extending in an uncontrolled fashion and it's motion is being stopped (topped out) via internal bumper (which it should have) and/or the rod mount (which in BMR's case is a fair bit outboard) then you'd have a point.
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