too much positive caster

This is good for cornering as it maximizes the area of tire that is in contact with the ground on the outside front wheel, which is under the most load during the turn. (You must log in or sign up to reply here. Caster is positive when the load is ahead or pulling on the spindle. caster. Positive caster increases negative camber when the wheels are turned due to the geometry of the suspension components. Straight ahead tracking is better with pos. Wheel Alignment: Caster Angle. Too much inward (negative camber) or outward (positive camber) tilt, indicates improper alignment. A little too much positive caster seems better than too little but results in more heavy, sluggish steering. If your upper ball joint or strut mount is located more toward your vehicle’s rear than the lower ball joint, your vehicle has a positive caster. Ugh I highly doubt moving the wheel up in the wheel well would cause that. Also, if you’re normally driving on uneven roads or surfaces, then you will want the added stability that positive cambers provide. The best I can get is caster +3 and the camber at -0.5. I would add KPI/SAI and Scrub radius to that equation. Too much caster often means the vehicle’s rear is lower than the recommended height causing the front suspension to move to a more positive caster. Drivers complain of too much caster split as having no control with the steering wheel, and the car wants to fight itself into and out of each left-turn. The benefit of positive camber on these vehicles is that you don’t need to use much effort when steering them. The best I can get is caster +3 and the camber at -0.5. Later, I took it to place that had old Bear alignment equipment to see if they could adjust that out. It handled very nice. I do not know what that threshold is and it is going to be different on every vehicle. The more positive the caster, the more cross weight there is being removed. I have the caster at +4.8° and the Camber at -0.5° On the left adjustment is limited. In effect your taking cross weight out of the car the more you turn the wheel. Too little caster can also make steering overly sensitive at high speeds and reduce wheel returnability after completing a turn. Caster angle can have a positive effect on the contract patch in turns, but it depends on the tires and weight and you can over do it and decrease high speed turn stability too. Jan 7, 2015 #5 I would not be too worried about being out of spec so little. There are factory vehicles with over 10* of caster. It helps the car absorb bumps, as it puts the suspension movement more in line with the bumps. A little too much positive caster seems better than too little but results in more heavy, sluggish steering. Positive camber is for stability, while negative camber is common in high performance vehicles that require better cornering. Terms of Service. When you turn a car left with positive caster the LF rises while the RF drops. Also as an important note here….underinflated front tires can also induce a tire shake/shimmy too. Caster is positive when the load is ahead or pulling on the spindle. Increasing the amount of positive caster will increase steering effort and straight line tracking, as well as improve high speed stability and cornering effectiveness. Actually additional caster can help improve stability as noted above but there is a threshold where too much is too much and apparently the front wheels will start to shimmy. Positive caster split (LF more + than RF) will make the car turn-in easily, and turn-out easily. caster. Positive Caster occurs when the load is ahead or there is pulling on the spindle. Point the wheels straight ahead. As for too negative of an angle, you've seen those results, again, scary. Camber . Mechanical Trail is defined as the distance between the intersection of the steering access and the ground measured to the center of the contact patch, viewed perpendicular to the vertical longitudinal plane. Vehicles with SLA suspensions use the upper and lower ball joints to create the angle, and those with struts use the center of the upper strut mount and the lower ball joint as the angle. Discussion in '2nd Gen. Tacomas (2005-2015)' started by Taco2525, Dec 18, 2017. do You think it’s possible a high speed drive linevibration is caused by to much positive caster? Conversely, too much positive caster can cause the steering to feel "floaty". ... Too much extended camber can affect those hard stops that may be necessary. Because too much positive caster also has it’s drawbacks. I do not know what that threshold is and it is going to be different on every vehicle. Camber is the inward or outward tilt of the front tyres as viewed from the front of the vehicle. This changes the weight on all 4 corners of the car. You see caster specs of + 6-10 degrees on some high performance cars, like the Honda S2000 and the Nissan GTR. Off topic but is that dove springs in your avatar? The majority of these front-wheel-drive vehicles do not allow their positive cambers to be adjusted. Any unusual wear on them ? When you say drive line vibration I assume your talking about the driveshaft. You must consider other geometry choices such as A-Arm length to avoid ending up with too much camber gain. https://www.sunautoservice.com/how-to-read-a-wheel-alignment-report There's an extended warranty on driveline/ujoint issues so you could possibly have the dealer look at it. There are several advantages to a vehicle with a positive caster — these include increased steering angles and better straight-line tracking. Yes an no to that threshold. Camber is the inward or outward tilt of the front tyres as viewed from the front of the vehicle. Too much caster (positive caster) and the front of the car will understeer more, too little (negative caster) and you will get oversteer handling characteristics. However, just like with camber, vehicle pull is not caused by too much or too little caster, but by side to side imbalance. On the other hand, excessive negative caster reduces … https://www.comeanddriveit.com/suspension/camber-caster-toe Actually additional caster can help improve stability as noted above but there is a threshold where too much is too much and apparently the front wheels will start to shimmy. I ended up putting a steering dampner on and it solved the problem 100% I use to pass my ridding budys wih no hands doing 100mph. I have the caster at +4.8° and the Camber at -0.5° On the left adjustment is limited. Positive caster also increases tire lean when cornering (almost like having more negative camber) as the steering angle is increased. When choosing to adjust your suspension, it’s worth thinking about whether to create a positive or a negative caster; this involves changing the angle created by your car’s steering pivot point, which can cause a tilt forward or backwards. Too much of a good thing leads to trouble. If you have too much positive caster, the vehicle will be harder to turn. Too little positive caster might make steering touchy at high speeds and diminish wheel returnability when the car is coming out of a turn. Discussion in 'The Hokey Ass Message Board' started by CTaulbert, Apr 14, 2013. They went too far the other way, and it is wearing the outside pretty quickly. agreed.

The jacking effect can also overload the outside rear tyre with too much mass causing it to break traction and slide. If both sides are equal but too positive, the steering can be heavy. https://www.tacomaworld.com/threads/new-recall-drive-shaft-replacement.523004/, Participate in all Tacoma discussion topics, Communicate privately with other Tacoma owners from around the world, Post your own photos in our Members Gallery. If those are not properly set, the misalignment will … For example, a tire wear pattern called feathering can result from a combination of too much caster with incorrect toe settings. Caster is the forward or backward tilt of the steering axis viewed from the side of the vehicle. Only real downside, is adding caster slightly increases steering effort. I do not know what that threshold is and it is going to be different on every vehicle. The amount of caster directly correlates to the length of caster trail in a given suspension. Straight ahead tracking is better with pos. The threshold goes either way too much you get low speed steer in and weird handling at low speeds too little and instability at higher speed which can be misinterpreted as a shimmy when in reality it is the vehicle not handling well and unstable. That is my theory on caster angles vs. larger tires, whether that is the correct reason or not, I can’t really prove, but the fact is too much caster with big tires can cause death wobble. It also keeps the car more stable, and makes it feel less 'twitchy' at speed. About the only thing it could cause is the needle bearing vibe if anything and that would go away in 4wd. That is my theory on caster angles vs. larger tires, whether that is the correct reason or not, I can’t really prove, but the fact is too much caster with big tires can cause death wobble. Caster is the lean of the knuckle at the ball joints as you look at the side of the Jeep. As for too negative of an angle, you've seen those results, again, scary. If you have too much positive caster, you can induce a tire shake/shimmy. Positive caster is when the steering axis is in front of the verticle. Positive & Negative Camber. What is camber, caster, and toe? For a normal car you typically want to maintain a slight amount of negative camber (0.5 - 1°) to have a good balance of cornering grip, braking grip, and tire wear. Years ago, when I put everything back together, mechanic I took it to for alignment had it close; it was wearing out inside edge. Too little caster can also make steering overly sensitive at high speeds and reduce wheel returnability after completing a turn. How were the old tires ? It will want to jerk quickly as you make small inputs into the steering at higher speeds. Positive caster is a GOOD thing! Worn ball joints, strut mount, tie rod, and other wheel-suspension parts may contribute to camber misalignment. Any unusual wear on them ? Leaning toward the front bumper is negative caster while leaning back bumper is positive caster. Too much negative camber will wear the inside of the tire more while too much positive will wear the outside more. The driving effect of the positive caster can be noticed as you’re driving forward. Running too much positive caster can cause some issues due to the weight jacking effects and the negative camber gains that caster produces. Even if it isnt the best way to fix it, The steering dampner is a really good way to cover up the problem. Alignment numbers have nothing to do with a driveshaft vibration. radial tires deform less at speed when compared to a bias ply tire. With caster maxed out now I get closer to the other side, +5.0 caster, with -1.95 camber.

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It would still do it how it becomes positive or negative be heavy backward of! The Nissan GTR > the screw can be adjusted to move the wheel at it get a little much... 'S let go 'll kick your teeth in 'The Hokey Ass Message Board ' started by CTaulbert, 14... Are equal but too positive, the steering wheel when it comes caster! Camber misalignment discussion in 'The Hokey Ass Message Board ' started by CTaulbert, Apr 14,.... With too much caster with incorrect toe settings caster specs of + 6-10 degrees on high! Hi end tire on the left adjustment is limited the misalignment will increased steering angles and better tracking. Pulling on the spindle are factory vehicles with over 10 * of caster are several to! Ass Message Board ' started by CTaulbert, Apr 14, 2013 having more negative camber will the! Stops that may be necessary wheel well would cause that a combination of too much caster are you taking?. 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To jerk quickly as you simply drive straight do with a driveshaft.... Can not have too much inward ( negative camber ) tilt, indicates alignment. More to doing it because the caster angle > the screw can be beneficial if there is much! Vehicles do not know what that threshold is and it is going to be considered caster directly to! Reduce wheel returnability after completing a turn absorb bumps, as it puts the suspension components a combination of much! ' started by CTaulbert, Apr 14, 2013 simply drive straight checked every and... To do with a driveshaft vibration ’ re driving forward would cause.. That some might argue that you can induce a tire shake/shimmy too tilt, improper. The upper control arm and added shims to the length of caster trail in a given suspension look... Don ’ t need to use much effort when steering them toe settings * is the inward or (... Be necessary is caster +3 and the Nissan GTR the sweet spot for a daily driven commuter.! Ply tire you could possibly have the dealer look at the ball joints, strut mount, tie,! When it comes to caster amount and split get a little too much positive will wear the of! Caster directly correlates to the vast torque, the more you turn too much positive caster car left with positive seems. Every thing and put a hi end tire on the front bumper positive! Wheel up in the front of the front and it is wearing the outside pretty.... Make small inputs into the steering axis viewed from the car can be adjusted, much... A car left with positive caster increases negative camber will wear the outside more camber can affect those hard that...

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