Mark Ortiz Chassis Newsletter Índice De Los Artículos Publicados
Total Page：16
File Type：pdf, Size：1020Kb
MARK ORTIZ CHASSIS NEWSLETTER ÍNDICE DE LOS ARTÍCULOS PUBLICADOS 2000.5 – Rear sway bars; Effects of wheel and axle offsets; Making handling more consistent; Relationship of gear ratio and RPM 2000.6 – Effects of rear spring split; Using brake floaters 2000.7 – Brake failure in pavement Late Models; Polar moment of inertia (yaw inertia) 2000.8 – Shock dynamics – What the shock dyno does and doesn’t tell you; Effects of gas pressure; Control ratio; Natural frequency, damping strength, and roadholding 2000.9 – How to string a car for 4-wheel alignment; Effects of caster 2000.10 – Checking rear axles for straightness; Torque arms versus pull bars 2000.11 – Suggested off-season reading 2000.12 – Springs, roll, and cornering balance; Shorty Panhard bars versus long ones 2001.1 – Wind tunnel testing for short track cars; Rear caster; Stacked coilover springs 2001.2 – Required frame stiffness; Making ballast weights 2001.3 – Safety issues – The HANS device; Soft wall design requirements 2001.4 – 5th coil location and rate; Soft wall update; Soft noses on cars 2001.5 – Chrome moly in stock cars; Rear stagger versus cross 2001.6 – Weight transfer in winged-over sprint cars, with discussion of the various components of weight transfer (wheel load transfer) 2001.7 – Chassis troubleshooting chart, with discussion of the 5 phases of the cornering process and assumptions on which the troubleshooting chart is based 2001.8 – Things that make spring changes work backwards 2001.9 – Stock car safety issues, including discussion of NASCAR’s Earnhardt Report; Tire data – its availability and its limitations 2001.10 – Balancing the car with camber and tire pressure 2001.11 – The big tracks and their big wrecks; Factors in spring selection 2002.1 – Suspension natural frequencies 2002.2 – Winston Cup harness installation; Things that make spring changes work backwards, revisited; Basic shock questions 2002.3 – Update/correction on Winston Cup harness installation; Racing front-drive cars 2002.4 – Quads on pavement 2002.5 – Suspension frequencies revisited; Quads on pavement revisited; Space frame or monocoque?; Tire care 2002.6 – Oil accidentally or deliberately applied to tires; Diagonal percentage and tire stagger for road racers; Narrower rear track than front 2002.7 – Braking/downshifting technique 2002.8 – Steering geometry variables; Importance of steering rack placement; Bump steer as Ackermann modification?; Relationship o horsepower and engine torque to acceleration and axle torque 2002.9 – Additional remarks on bump steer and horsepower/torque; Finding centers of gravity for whole car, unsprung masses, and sprung mass 2002.10 – Effects of wheelbase, CG height, and static rear percentage on traction and corner exit behavior 2002.11 – Push rods, pull rods, or both; More on trail and steering feel; Kart scaling; Another tire care tip 2002.12 – Ackermann effect, with recommendations for autocross and hillclimbing; Torque and power distribution with various types of differentials 2002.12 – Analyzing shock traces 2003.1 – Shocks wanted for research; Tire warmers found; Spring placement on triangulated 4-link rear axle; Roll center with a j-bar 2003.2 – Shock research update; More on rear wheel placement and traction, including discussion of gyroscopic precession 2003.3 – Tire warmers less expensive than I though; Independent rear suspension for dirt racing? 2003.4 – Special issue on shock and spring forces and their effects on tire loading 2003.7 – Right rear spring stiffest, on a Cup car? Pushrod angle, motion ratio, wheel rates, and roll angle 2003.8 – Load transfer basics 2003.9 – Shock research update – end-of-stroke phenomena due to fluid compressibility, as opposed to acceleration sensitivity 2003.11 – Weight distribution and tire size; Car width versus drag 2003.12 – More on racing front-drive cars, and on load transfer; Single or dual rear brakes for FSAE? 2004.1 – Reverse Ackermann or toe-in on ovals; Setting up road racing cars that are heavier on one side than the other; Independent or beam axle front suspension for ovals? 2004.3 – Types of differentials and their effects on car behavior 2004.4 – Effect of brake caliper mounting position; More on weight distribution; Spring splits with big bars 2004.5 – Correction to April remarks on caliper mounting (archived April issue incorporates the correction); New Nextel Cup tire and implications for control arm geometry; control arm angles in F1; Arm angles in triangulated 4-bar beam axle rear suspension 2004.6 – More on F1 control arm angles, with discussion of “lateral anti” concept and shortcomings of using force line intersection as roll center; Use of clutch when downshifting 2004.7 – Setup for lower grip; Lowering blocks on truck arms; Ohlins high-frequency shock piston; Which front shock to soften for improved exit; soft links on sway bars 2004.8 – Further discussion of roll center assignment based on lateral anti, with discussion of lateral migration of the roll center as traditionally defined 2004.9 – Tire load sensitivity and weight transfer in trailbraking; Why are wide tires better?; Relative importance of front/rear weight distribution versus yaw inertia; Roll and ride spring preload in monoshock suspensions; Why so few rear monoshock suspensions? 2004.12 – Roll center below ground; Roll moments from longitudinal anti 2005.1 – Steering axis inclination and scrub radius 2005.3 – Finer points of anti-roll bars on stock cars 2005.5 – Can an oval track car have too much left percentage? 2005.7 – Dynamics of three-wheeled vehicles 2005.9 – Load transfer case with added rear ride compression 2005.11 – Optimizing engine-over-drive-wheels cars 2006.1 – Tires in the snow 2006.2 – Roll axis inclination 2006.3 – Worm gear vs. clutch pack differentials 2006.4 – Springs, bars, and load transfer 2006.5 – Rear percentage or polar moment? 2006.6 – Effects of spring rates and damper settings during cornering 2006.7 – Beam axle front suspension pros, cons, and design issues 2006.8 – Effects of Panhard bar fore-aft location, slope, and offset 2006.9 – Roll center in trailing arm front suspension; More on roll axis and related analytical topics 2006.10 – Twist beams and jointed De Dion tubes 2006.11 – Stiff rebound damping 2006.12 – Coil binding setups in stock cars – friend or foe?; Falling force shocks 2007.1 – Tall vs. short sidewalls 2007.2 – Modern driveshaft joints vs. rubber doughnuts; Zero-droop setups 2007.3 – Diamond layout 2007.4 – Roll steer and anti-squat/anti-lift in strut suspension 2007.5 – Roll axis for live rear axle road/hillclimb car; Roll axis of the axle 2007.6 – Another triangulated four-link axle; Large vs. small tire and wheel diameter 2007.7 – More thoughts on zero-droop setups, and related oval track spring split issues; High or low panhard bar 2007.8 – Is it bad to lift a wheel?; Hollow vs. solid anti-roll bars 2007.9 – Droop-limited rear suspension; Satchell link rear suspension; A word from the inventor 2007.10 – What exactly are shaker rigs for? 2007.11 – On the march again; Radial tire camber; A radical radial notion 2007.12 – Ins and outs of toe and ackermann 2008.1 – More exotic vehicle layout ideas 2008.3 – Another exotic car layout 2008.4 – Late Corvair rear suspension 2008.5 – Another pony car suspension from the 60′s; Really quick steering 2008.6 – Why not go for 100% camber recovery?; Gyros for roll stability 2008.7 – Front to rear track ratio 2008.8 – Dirty tricks; Porsche 993 rear suspension 2008.9 – Monoshock suspensions; Z-bars; Stock car front ends with bump rubbers 2008.10 – Differentials and yaw control 2008.12 – Controlling AWD front/rear torque split on a budget; Is there such a thing as too big (in tires, that is)? 2009.1 – Damping ratio 2009.3 – Trailing arms with torsional rubber springing; Ride and roll rates with monoshocks 2009.4 – “Minding Your Anti” video now on DVD; Raised lower control arms on 2009 F1 cars; Pullrod suspensions in F1; Rate and length numbers on torsion bars 2009.5 – The anti controversy 2009.7 – The unsprung component in load transfer 2009.8 – Chasing a push 2009.9 – Leading and trailing wheels for oval track 2010.1 – Use ride height to tune cornering balance, or anti-roll bars?; Roll center and anti-lift in triangulated 4-link beam axle; Measuring grip 2010.2 – Effect of changing location of just the wheel center; Effects of droop limiting 2010.3 – Old-school rocker suspension; De Dion tube design and location; Lateral location of live axle 2010.4 – Banked turn puzzle; Reverse-cant rear leaf springs 2010.5 – Selecting rear end ratio; Torque tube for front engine IRS car 2010.6 – Torsion bar tube height; Twin I beam suspension, Relationship of tire size and weight distribution 2010.7 – Tuning transient behavior of front-wheel-drive autocross car 2010.8 – When lots of front roll stiffness helps, and when it doesn’t 2010.9 – When one is a very small animal: Considering an RC car 2010.10 – Roll center theory 2010.11 – High and low speed balance, and torque arm length 2010.12 – Hybrid or semi-independent suspensions 2011.1 – Coil bind and bump stop setups in stock cars 2011.2 – Sway bar/spring rate equivalency; What wheel rate for damper calculations? 2011.3 – Followup information to January issue on stock car anti-roll bar preload and related asymmetries; Followup question to the February issue on anti-roll bars 2011.4 – Negative camber only on the front wheels, or more on the fronts than on the rears, on some cars; Roll center/front view geometry with dual ball joints 2011.5 – Why use sway bars at all? 2011.6 – Effects