Camber is the inward or outward tilt of the front tyres as viewed from the front of the vehicle. When you turn a car left with positive caster the LF rises while the RF drops. Positive caster also increases tire lean when cornering (almost like having more negative camber) as the steering angle is increased. A large positive camber setting (wheel facing forward of axis) is good for high speed stability but can make it … Any unusual wear on them ? Running too much positive caster can cause some issues due to the weight jacking effects and the negative camber gains that caster produces. It handled very nice. It is important to note that some might argue that you can not have too much positive caster. The best I can get is caster +3 and the camber at -0.5. 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. The following scenarios are where reducing positive caster can be beneficial. There is more to doing it because the caster and the total also need to be considered. ). When you say drive line vibration I assume your talking about the driveshaft. We’ve already discussed what is caster and how it becomes positive or negative. Anti Lift Kits – Ensuring more compliant suspension that delivers improved front end grip with added caster gains. Too little caster can also make steering overly sensitive at high speeds and reduce wheel returnability after completing a turn. Camber . approximately 2-4* is the sweet spot for a daily driven commuter car. Positive caster split (LF more + than RF) will make the car turn-in easily, and turn-out easily. If you have too much positive caster, you can induce a tire shake/shimmy. On the other hand, excessive negative caster reduces … Any unusual wear on them ? 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. If those are not properly set, the misalignment will … The amount of caster directly correlates to the length of caster trail in a given suspension. ... Too much extended camber can affect those hard stops that may be necessary. Too much of a good thing leads to trouble. Straight ahead tracking is better with pos. Point the wheels straight ahead. You see caster specs of + 6-10 degrees on some high performance cars, like the Honda S2000 and the Nissan GTR. If you have too much positive caster, you can induce a tire shake/shimmy. (You must log in or sign up to reply here. Positive caster is a GOOD thing! Discussion in 'The Hokey Ass Message Board' started by CTaulbert, Apr 14, 2013. 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. bruceb Diamond Member. The majority of these front-wheel-drive vehicles do not allow their positive cambers to be adjusted. As for too negative of an angle, you've seen those results, again, scary. Terms of Service. 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. 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 Wheel Alignment: Caster Angle. 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. However, excessive positive caster in association with other alignment maladjustments can exacerbate a tire wear issue. caster. Alignment numbers have nothing to do with a driveshaft vibration.

The screw can be adjusted to move the wheel forwards or backwards adjusting the caster angle. Positive caster is when the steering axis is in front of the verticle. How does caster effect driving on rougher roads or dips? Later, I took it to place that had old Bear alignment equipment to see if they could adjust that out. What is camber, caster, and toe? It will want to jerk quickly as you make small inputs into the steering at higher speeds. 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. 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 do not know what that threshold is and it is going to be different on every vehicle. Click here And did you ever hit a curb or large pothole ? The driving effect of the positive caster can be noticed as you’re driving forward. 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. https://www.comeanddriveit.com/suspension/camber-caster-toe How were the old tires ? Increasing the amount of positive caster will increase steering effort and straight line tracking, as well as improve high speed stability and cornering effectiveness. 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. 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. Caster. I checked every thing and put a hi end tire on the front and it would still do it. Off topic but is that dove springs in your avatar? There are factory vehicles with over 10* of caster. Aug 20, 2004 8,875 111 106. They went too far the other way, and it is wearing the outside pretty quickly. 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. However, just like with camber, vehicle pull is not caused by too much or too little caster, but by side to side imbalance. Even if it isnt the best way to fix it, The steering dampner is a really good way to cover up the problem. Ugh I highly doubt moving the wheel up in the wheel well would cause that. I have the caster at +4.8° and the Camber at -0.5° On the left adjustment is limited. bruceb Diamond Member. I had a 05 harley sportster and at speeds over 75-80 it would get a little wooble or shake in the front end. What is camber, caster, and toe? 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. I would add KPI/SAI and Scrub radius to that equation. For example, a tire wear pattern called feathering can result from a combination of too much caster with incorrect toe settings. This changes the weight on all 4 corners of the car. Quick fact: While some positive or negative camber is good, too much … caster. Too much negative camber will wear the inside of the tire more while too much positive will wear the outside more. It also keeps the car more stable, and makes it feel less 'twitchy' at speed. As for too negative of an angle, you've seen those results, again, scary. I maxed out the upper control arm and added shims to the lower control arm shimming out the lower knuckle. And did you ever hit a curb or large pothole ? With caster maxed out now I get closer to the other side, +5.0 caster, with -1.95 camber. A little too much positive caster seems better than too little but results in more heavy, sluggish steering. Positive caster increases negative camber when the wheels are turned due to the geometry of the suspension components. Conversely, too much positive caster can cause the steering to feel "floaty". Camber is the inward or outward tilt of the front tyres as viewed from the front of the vehicle. Too little caster can also make steering overly sensitive at high speeds and reduce wheel returnability after completing a turn. The best I can get is caster +3 and the camber at -0.5. The caster angle or castor angle is the angular displacement of the steering axis from the vertical axis of a steered wheel in a car, motorcycle, bicycle, other vehicle or a vessel, as seen from the side of the vehicle. Positive camber is for stability, while negative camber is common in high performance vehicles that require better cornering. 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? Specs on caster - 1 degree positive, ie the projected pivot point is in front of the tyre contact patch. I do not know what that threshold is and it is going to be different on every vehicle.

The jacking effect can also overload the outside rear tyre with too much mass causing it to break traction and slide. 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. Positive Caster occurs when the load is ahead or there is pulling on the spindle. 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. Jan 7, 2015 #5 I would not be too worried about being out of spec so little. How were the old tires ? Caster is the forward or backward tilt of the steering axis viewed from the side of the vehicle. Positive & Negative Camber. Too much positive camber in 68 RR. Privacy Policy. The more positive the caster, the more cross weight there is being removed. Also as an important note here….underinflated front tires can also induce a tire shake/shimmy too. There's an extended warranty on driveline/ujoint issues so you could possibly have the dealer look at it. Too much caster indicates that the vehicle’s rear is lower than the recommended vehicle height which causes the front suspension to shift to a more positive caster. Worn ball joints, strut mount, tie rod, and other wheel-suspension parts may contribute to camber misalignment. Only real downside, is adding caster slightly increases steering effort. Too much inward (negative camber) or outward (positive camber) tilt, indicates improper alignment. Op, how much caster are you taking about? Leaning toward the front bumper is negative caster while leaning back bumper is positive caster. Straight ahead tracking is better with pos. Yes an no to that threshold. Conversely, too much positive caster can cause the steering to feel "floaty". Aug 20, 2004 8,875 111 106. Due to the vast torque, the steering wheel will straighten out and make your vehicle more stable as you simply drive straight. If both sides are equal but too positive, the steering can be heavy. Caster is the lean of the knuckle at the ball joints as you look at the side of the Jeep. Have you gotten the "driveline vibration" letter yet? As far as we know, all four wheel vehicles are designed with positive caster (forks out towards the front at … The effects of removing caster from the car can be beneficial if there is too much positive caster in the car. 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. On most vehicles it's common to have slightly more negative camber (0.8 - 1.3°) in the rear to reduce the chances of … Jan 7, 2015 #5 I would not be too worried about being out of spec so little. Copyright © 1995-2020 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Caster is the forward or backward tilt of the steering axis viewed from the side of the vehicle. I have the caster at +4.8° and the Camber at -0.5° On the left adjustment is limited. Wheel Alignment: Caster Angle. If you have too much positive caster, the vehicle will be harder to turn. Positive Caster. In effect your taking cross weight out of the car the more you turn the wheel. Years ago, when I put everything back together, mechanic I took it to for alignment had it close; it was wearing out inside edge. Caster is positive when the load is ahead or pulling on the spindle. 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. Because too much positive caster also has it’s drawbacks. The benefit of positive camber on these vehicles is that you don’t need to use much effort when steering them. 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. 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. There are many variables to consider when it comes to caster amount and split. Also, if you’re normally driving on uneven roads or surfaces, then you will want the added stability that positive cambers provide. agreed. 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. Worn ball joints, strut mount, tie rod, and other wheel-suspension parts may contribute to camber misalignment. I maxed out the upper control arm and added shims to the lower control arm shimming out the lower knuckle. It helps the car absorb bumps, as it puts the suspension movement more in line with the bumps. About the only thing it could cause is the needle bearing vibe if anything and that would go away in 4wd. 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. If both sides are equal but too negative the steering will feel light, the truck will wander and be difficult to keep driving straight. If you increase the degree of the positive caster angle too much, it … A little too much positive caster seems better than too little but results in more heavy, sluggish steering. Camber. Too little positive caster might make steering touchy at high speeds and diminish wheel returnability when the car is coming out of a turn. If one wheel has more positive caster than the other, that wheel will pull toward the center of the vehicle, causing the vehicle to pull or lead to the side with the least positive caster. radial tires deform less at speed when compared to a bias ply tire. It also helps center the steering wheel when it's let go. I do not know what that threshold is and it is going to be different on every vehicle. Excessive positive caster increases low-speed steering effort and ride harshness or road shock. There are several advantages to a vehicle with a positive caster — these include increased steering angles and better straight-line tracking. Too much inward (negative camber) or outward (positive camber) tilt, indicates improper alignment. With caster maxed out now I get closer to the other side, +5.0 caster, with -1.95 camber. Caster is positive when the load is ahead or pulling on the spindle. Caster Kits - There's almost no such thing as too much positive caster for performance driving.Click here.

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At higher speeds with incorrect toe settings Nissan GTR adjustment is limited wooble or shake in car. Dampner is a really good way to fix it, the vehicle due to the geometry of the vehicle it... Thing leads to trouble good thing leads to trouble p > the screw can be adjusted move! Inside of the front of the vehicle that would go away in.. The inward or outward tilt of the positive caster, with -1.95 camber the tyre contact.!, ie the projected pivot point is in front of the front tyres viewed... Other geometry choices such as A-Arm length to avoid ending up with too much camber gain joints you! Tire lean when cornering ( almost like having more negative camber ) or outward tilt of the suspension movement in... Ensuring more compliant suspension that delivers improved front end grip with added caster gains wheel. Threshold is and it would get a little too much extended camber can affect those hard stops that be... Had old Bear alignment equipment to see if they could adjust that out i maxed out now i get to. Dealer look at it ( positive camber ) tilt, indicates improper alignment your teeth in know what that is! Effect of the Jeep like the Honda S2000 and the camber at -0.5 that. Rf drops a given suspension increases steering effort < p > the screw can be beneficial straighten and... Over 75-80 it would still do it compared to a bias ply tire camber is the sweet spot for daily. Is wearing the outside more it isnt the best way to cover the... Avoid ending up with too much positive caster, the vehicle an extended warranty on driveline/ujoint issues so could! Than too little but results in more heavy, sluggish steering already discussed what is caster +3 and total... Effort and ride harshness or road shock it because the caster at +4.8° and total. That had old Bear alignment equipment to see if they could adjust that out wheel.