Grassroots Motorsports
Issue link: http://grassrootsmotorsports.epubxp.com/i/501675
Grassroots Motorsports 156 PROJECT CAR: NISSAN 350Z the math, and we bar what we're talking about alr . , so we know based on comparative data that an autocross- capable street car should have a suspension fr But how do we choose appropriate spring rates? Calculating fr om spring e root of wheel rate/ sprung weight. We've alr learned how to calculate wheel ner weight minus the when the suspension articulates. The wheel and tire, hub and brakes all constitute unsprung weight. In the case of our Z, we were looking at r corner isn't going to throw off the math enough to pr om making a decision. If we work the math–looking for a suspension fr ound 2 Hz front and rear, factoring in motion ratio–we fnd out that we want springs rated r front and 700 lbs./in. in the rear. What luck! ISC happens to have a kit that comes with 14mm/kg (783 lbs./in.) and 12mm/kg (672 lbs./in.) springs front and rear. It's almost But we str a starting point. Finding the real answer requires more data: testing, lap times and personal preference. You also need shocks capable of taming the higher frequencies of more extreme suspensions. We know eet Touring 350Z com- petitors who are getting exceptional results running frequencies near 2.5 front and rear. Aftermarket Graphics: vinyl logos, aftermarketgraphics.com BFGoodrich: g-Force Rival tires, bfgoodrichtires.com, (877) 788-8899 Balanced Performance Motorsports: service, balancedperformance.com, (678) 546-3133 Brock Racing Enterprises: graphics, bre2.net, (702) 558-3374 Eastwood: elasti-wrap, tools, eastwood.com, (800) 343-9353 Exedy USA: clutch, exedyusa.com, (800) 346-6091 Hawk Performance: brake pads, hawkperformance.com, (800) 542-0972 ISC Suspension: suspension, iscsuspension-na.com, (603) 715-9078 SOURCES