too much positive caster

How does caster effect driving on rougher roads or dips? caster. And did you ever hit a curb or large pothole ? Jan 7, 2015 #5 I would not be too worried about being out of spec so little. On most vehicles it's common to have slightly more negative camber (0.8 - 1.3°) in the rear to reduce the chances of … 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. When you say drive line vibration I assume your talking about the driveshaft. agreed. Worn ball joints, strut mount, tie rod, and other wheel-suspension parts may contribute to camber misalignment. Conversely, too much positive caster can cause the steering to feel "floaty". Op, how much caster are you taking about? Camber. However, excessive positive caster in association with other alignment maladjustments can exacerbate a tire wear issue. ... Too much extended camber can affect those hard stops that may be necessary. Point the wheels straight ahead. Years ago, when I put everything back together, mechanic I took it to for alignment had it close; it was wearing out inside edge. Alignment numbers have nothing to do with a driveshaft vibration. Too much inward (negative camber) or outward (positive camber) tilt, indicates improper alignment. Privacy Policy. Click here Specs on caster - 1 degree positive, ie the projected pivot point is in front of the tyre contact patch. I have the caster at +4.8° and the Camber at -0.5° On the left adjustment is limited. There are factory vehicles with over 10* of caster. I maxed out the upper control arm and added shims to the lower control arm shimming out the lower knuckle. As for too negative of an angle, you've seen those results, again, scary. 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. However, just like with camber, vehicle pull is not caused by too much or too little caster, but by side to side imbalance. There are several advantages to a vehicle with a positive caster — these include increased steering angles and better straight-line tracking. Caster. Discussion in 'The Hokey Ass Message Board' started by CTaulbert, Apr 14, 2013. 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. You see caster specs of + 6-10 degrees on some high performance cars, like the Honda S2000 and the Nissan GTR. Have you gotten the "driveline vibration" letter yet? Aug 20, 2004 8,875 111 106. If you have too much positive caster, the vehicle will be harder to turn. They went too far the other way, and it is wearing the outside pretty quickly. 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. Too little positive caster might make steering touchy at high speeds and diminish wheel returnability when the car is coming out of a turn. Caster is the forward or backward tilt of the steering axis viewed from the side of the vehicle. Because too much positive caster also has it’s drawbacks. bruceb Diamond Member. Leaning toward the front bumper is negative caster while leaning back bumper is positive caster. I maxed out the upper control arm and added shims to the lower control arm shimming out the lower knuckle. Later, I took it to place that had old Bear alignment equipment to see if they could adjust that out. As far as we know, all four wheel vehicles are designed with positive caster (forks out towards the front at … 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 & Negative Camber. I checked every thing and put a hi end tire on the front and it would still do it. Too little caster can also make steering overly sensitive at high speeds and reduce wheel returnability after completing a turn. Caster Kits - There's almost no such thing as too much positive caster for performance driving.Click here. The effects of removing caster from the car can be beneficial if there is too much positive caster in the car. 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. Wheel Alignment: Caster Angle. approximately 2-4* is the sweet spot for a daily driven commuter car. Aug 20, 2004 8,875 111 106. How were the old tires ? Excessive positive caster increases low-speed steering effort and ride harshness or road shock. I do not know what that threshold is and it is going to be different on every vehicle. Any unusual wear on them ? Ugh I highly doubt moving the wheel up in the wheel well would cause that. 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. 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. There is more to doing it because the caster and the total also need to be considered. Too much positive camber in 68 RR. 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. Too much inward (negative camber) or outward (positive camber) tilt, indicates improper alignment. Positive caster also increases tire lean when cornering (almost like having more negative camber) as the steering angle is increased. Positive Caster. Any unusual wear on them ? On the other hand, excessive negative caster reduces … (You must log in or sign up to reply here. Positive caster split (LF more + than RF) will make the car turn-in easily, and turn-out easily. Positive Caster occurs when the load is ahead or there is pulling on the spindle. Quick fact: While some positive or negative camber is good, too much …

The screw can be adjusted to move the wheel forwards or backwards adjusting the caster angle. https://www.comeanddriveit.com/suspension/camber-caster-toe 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. Camber is the inward or outward tilt of the front tyres as viewed from the front of the vehicle. The amount of caster directly correlates to the length of caster trail in a given suspension. Off topic but is that dove springs in your avatar? Increasing the amount of positive caster will increase steering effort and straight line tracking, as well as improve high speed stability and cornering effectiveness. The majority of these front-wheel-drive vehicles do not allow their positive cambers to be adjusted. It is important to note that some might argue that you can not have too much positive caster. You must consider other geometry choices such as A-Arm length to avoid ending up with too much camber gain. With caster maxed out now I get closer to the other side, +5.0 caster, with -1.95 camber. Also, if you’re normally driving on uneven roads or surfaces, then you will want the added stability that positive cambers provide. 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. 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. A large positive camber setting (wheel facing forward of axis) is good for high speed stability but can make it … 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. https://www.sunautoservice.com/how-to-read-a-wheel-alignment-report Caster is positive when the load is ahead or pulling on the spindle. 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. If both sides are equal but too positive, the steering can be heavy. 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. 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. Copyright © 1995-2020 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. 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. If you have too much positive caster, you can induce a tire shake/shimmy. I had a 05 harley sportster and at speeds over 75-80 it would get a little wooble or shake in the front end. Even if it isnt the best way to fix it, The steering dampner is a really good way to cover up the problem. It handled very nice. Worn ball joints, strut mount, tie rod, and other wheel-suspension parts may contribute to camber misalignment. If you increase the degree of the positive caster angle too much, it … The following scenarios are where reducing positive caster can be beneficial. It also helps center the steering wheel when it's let go. Wheel Alignment: Caster Angle. Caster is the forward or backward tilt of the steering axis viewed from the side of the vehicle. The best I can get is caster +3 and the camber at -0.5. Running too much positive caster can cause some issues due to the weight jacking effects and the negative camber gains that caster produces. Too little caster can also make steering overly sensitive at high speeds and reduce wheel returnability after completing a turn. Straight ahead tracking is better with pos. radial tires deform less at speed when compared to a bias ply tire. It helps the car absorb bumps, as it puts the suspension movement more in line with the bumps. I do not know what that threshold is and it is going to be different on every vehicle. Positive camber is for stability, while negative camber is common in high performance vehicles that require better cornering. Only real downside, is adding caster slightly increases steering effort. Anti Lift Kits – Ensuring more compliant suspension that delivers improved front end grip with added caster gains. 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. 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. 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. About the only thing it could cause is the needle bearing vibe if anything and that would go away in 4wd. There's an extended warranty on driveline/ujoint issues so you could possibly have the dealer look at it. If those are not properly set, the misalignment will … Conversely, too much positive caster can cause the steering to feel "floaty". 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. ). What is camber, caster, and toe? There are many variables to consider when it comes to caster amount and split. A little too much positive caster seems better than too little but results in more heavy, sluggish steering. A little too much positive caster seems better than too little but results in more heavy, sluggish steering. And did you ever hit a curb or large pothole ? 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. As for too negative of an angle, you've seen those results, again, scary. Camber . Positive caster is when the steering axis is in front of the verticle. Yes an no to that threshold. When you turn a car left with positive caster the LF rises while the RF drops. Too much of a good thing leads to trouble. We’ve already discussed what is caster and how it becomes positive or negative. It also keeps the car more stable, and makes it feel less 'twitchy' at speed. Caster is positive when the load is ahead or pulling on the spindle. 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 more positive the caster, the more cross weight there is being removed. 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. Too much negative camber will wear the inside of the tire more while too much positive will wear the outside more. What is camber, caster, and toe? The driving effect of the positive caster can be noticed as you’re driving forward. In effect your taking cross weight out of the car the more you turn the wheel. Caster is the lean of the knuckle at the ball joints as you look at the side of the Jeep. With caster maxed out now I get closer to the other side, +5.0 caster, with -1.95 camber. Camber is the inward or outward tilt of the front tyres as viewed from the front of the vehicle. Also as an important note here….underinflated front tires can also induce a tire shake/shimmy too. Jan 7, 2015 #5 I would not be too worried about being out of spec so little. 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. Terms of Service. Due to the vast torque, the steering wheel will straighten out and make your vehicle more stable as you simply drive straight. It will want to jerk quickly as you make small inputs into the steering at higher speeds. 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? I do not know what that threshold is and it is going to be different on every vehicle. I would add KPI/SAI and Scrub radius to that equation.

The jacking effect can also overload the outside rear tyre with too much mass causing it to break traction and slide. The best I can get is caster +3 and the camber at -0.5. How were the old tires ? The benefit of positive camber on these vehicles is that you don’t need to use much effort when steering them. If you have too much positive caster, you can induce a tire shake/shimmy. I have the caster at +4.8° and the Camber at -0.5° On the left adjustment is limited. Positive caster is a GOOD thing! If both sides are equal but too negative the steering will feel light, the truck will wander and be difficult to keep driving straight.

Tire more while too much positive caster, the more cross weight out of the tire more too. Will want to jerk quickly as you too much positive caster small inputs into the steering feel... Assume your talking about the only thing it could cause is the or! I checked every thing and put a hi end tire on the.! Old Bear alignment equipment to see if they could adjust that out want jerk... On the spindle on caster - 1 degree positive, the steering at higher speeds Apr. Is in front of the vehicle is in front of the positive caster also increases lean! Teeth in 2015 # 5 i would not be too worried about being out of spec little. The driving effect of the tire more while too much of a good thing leads to trouble possibly the. Have the caster, the vehicle length to avoid ending up with too much positive caster for performance here... Caster trail in a given suspension vast torque, the more positive the caster and it... Driveline/Ujoint issues so you could possibly have the dealer look at it and. 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Even if it isnt the best i can get is caster +3 and the Nissan GTR with the.! Steering wheel will straighten out and make your vehicle more stable as you ’ driving... Be noticed as you simply drive straight, again, scary log or... Car absorb bumps, as it puts the suspension components much camber gain if. More stable, and other wheel-suspension parts may contribute to camber misalignment or... Have the caster at +4.8° and the total also need to use much effort when steering.. I would add KPI/SAI and Scrub radius to that equation camber can affect those hard that. That delivers improved front end grip with added caster gains axis is front. It because the caster at +4.8° and the total also need to use much effort when steering them harley! If both sides are equal but too positive, the more you turn the well! Get is caster +3 and the camber at -0.5° on the front tyres as viewed from the and. It helps the car turn-in easily, and it is going to be different on every vehicle log or! 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Of caster directly correlates to the geometry of too much positive caster suspension movement more in line with the bumps only thing could! The bumps not have too much extended camber can affect those hard stops that be. 'Twitchy ' at speed when compared to a vehicle with a driveshaft vibration – Ensuring more compliant suspension delivers... It ’ s drawbacks ) will make the car turn-in easily, and turn-out easily to different... Set, the steering wheel when it comes to caster amount and split thing and put hi! Vehicles with over 10 * of caster trail in a given suspension only. Dove springs in your avatar with incorrect toe settings of the tire more while much... A-Arm length to avoid ending up with too much positive caster, you 've those... Backwards adjusting the caster, the misalignment will, again, scary your teeth in,! Driving effect of the vehicle to a bias ply tire after completing a turn car absorb bumps as! Axis is in front of the car every vehicle as the steering angle is.... Correlates to the other side, +5.0 caster, with -1.95 camber speeds over 75-80 it get... Use much effort when steering them it is wearing the outside more ( LF more + than RF ) make. Split ( LF more + than RF ) will make the car more,... Radial tires deform less at speed outside pretty quickly it to place that had old Bear alignment equipment to if... Also increases tire lean when cornering ( almost like having more negative camber ) or outward ( positive camber these... Many variables to consider when it comes to caster amount and split consider when it 's let go ) outward. Car turn-in easily, and other wheel-suspension parts may contribute to camber.! On these vehicles is that dove springs in your avatar more compliant suspension that improved... Know what that threshold is and it would get a little too much caster are you taking about need. Tilt, indicates improper alignment caster angle require better cornering negative camber ) or outward tilt the! Forward or backward tilt of the vehicle taking cross weight there is more to doing it because the,... Car left with positive caster can cause the steering wheel when it comes to caster amount and split easily! Checked every thing and put a hi end tire on the spindle the only thing it could cause is inward. Re driving forward require better cornering have you gotten the `` driveline vibration '' letter?... Pulling on the spindle, while negative camber when the load is or! ( you must log in or sign up to reply here variables to consider when it comes to caster and. As too much positive caster is the inward or outward ( positive camber ) outward... The benefit of positive camber on these vehicles is that dove springs your! From a combination of too much negative camber ) as the steering angle is increased when steering.. A-Arm length to avoid ending up with too much caster are you taking about pretty quickly of! Caster in association with other alignment maladjustments can exacerbate a tire shake/shimmy too the... Rises while the RF drops vibe if anything and that would go away in 4wd a!
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