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how to measure caster angle jeep

Meaning, if you take the tire off and look head-on at the ball joints from the side, … WHEEL ALIGNMENT PROCEDURES. Camber angle is NOT adjustable. Jump to page: Results 1 to 10 of 11 Thread: JK Caster and Pinion angles. Had to read it after I typed it for it to sink in. Often, shims are placed between the wishbone and the hub on the side of the hub. As the car corners, the inside front wheel will lift jacking mass to the outside rear wheel. So, after doing the math, if you have 1.5 degrees on the pinion, you'll have 4.5 degrees caster, … The forks arrive at the center hub at an angle. One common way to adjust caster is to install an offset caster bush. If you've lifted your Jeep and haven't already made adjustments, you shouldn't have anything more than stock caster which would be +4°. It's in the spindle normally, or if the vehicle is FWD, it might be in the way the strut is mounted. Therefore, reducing the caster and making the steering a bit easier will be beneficial. Therefore if the driver feels like they are having to manually steer the car out of a corner and are putting in too much effort to bring the car back to a straight line then increasing the caster will help this. Yes in most cases caster is fixed and will require an aftermarket suspension component to adjust it but he results are often worth the purchase and set up time. The front steering forks on a motorcycle are an easy-to-see example of how caster works. I think I am thinking of IFS where a "plate" is mounted to the rim and the wheels are turned to indicate the caster? The effects of increasing the positive caster of your car have multiple benefits that can reduce issues that are being fed back from drivers about handling. Excessive camber in one side can indicate a worse problem like a bent axle tube. The forks arrive at the center hub at an angle. The positive caster allows the tire to return to center (the reason you can ride a bike with no hands). - Find the difference in the camber measurements. VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Tyre Failure – Graining, Tearing, Blistering and Wearing, Tyre Performance and Grip – A Deeper Look, Calculating Ideal Spring and Roll Bar Rates, Calculating Ideal Spring and Roll Bar Rates Part 2. I'm not entirely sure how to measure … The two wishbone mounting points now need connecting with a straight line. The jacking effect can also overload the outside rear tyre with too much mass causing it to break traction and slide. Reply. The How to of setting the proper caster adjustment for a spring over axle Jeep. Thanks for the help, Check the toe in alignment, ball joints, and steering system(drag-link/tie rod). Positive caster slopes toward the rear of the vehicle, negative toward the front. caster alignment specs are based off of rotating the front wheels 20º to the right and 20º to the left (from straight ahead) and measuring the difference between the two different camber angles to help determine the caster angle. If they are saying that the steering feels vague then this will improve that. Best advice, to have the jeep aligned- compare their #'s to the #" you get for future adjustments. Your email address will not be published. Automotive. Yea nevermind. Ex.. You wanted and set for 4* and the alignment reads 5*. How do measure caster angle? Your email address will not be published. If the car is beginning to understeer mid corner due to too much negative camber being present on the outside wheel then reducing the positive caster will reduce the camber gain when cornering. It is done by placing the front wheels of your car on some turning plates that have the scale set to 0 degrees. Since this is a Powered Steering vehicle, should i be concerned because of the increased load on the steering control components by iincreasing the caster? 6. Increasing the steering feel of the car giving the driver more feedback through the steering wheel. Toe can be measured in inches or degrees. We try to define a slope as the relationship of a single line or plane in relationship to the horizon and an angle is the relationship of one slope to another. So 0 degree at diff is 6 caster. Yes, pinion angle and caster are directly joined together. I talked with the local 4x4 shop and they told me how to measure the caster angle. Actually the knuckles are cut straight, its the guy that welds the knuckle ends to the axle tube that sets the Caster. What will change with lift is the SHAFT angle, which is dependent on pinion angle to an extent, but we generally set the front for the caster angle and live with the pinion. Did you miss your ... That angle is the caster. That angle is the caster. Until then just to feel safer while driving it, thought I would fix the wandering issue, ball-joints. I am really struggling with trying to correctly position the upper a frame mount. Jul 16, 2018 #3 Glenn Hodges said: I just had an alignment and my caster angle was measured at 4 degrees, is this … I hoping to keep it till next summer and do some upgrades. For your 32.5" tires, I'd want closer to 6 degrees. I am wondering if there is an image for the JL showing what it would be. It can also cause oversteer. Good luck with the conversion. Some have the damper location offset rearward to increase the caster angle of the car. Realistically, you aren't going to measure your current caster with an angle finder. Tilting the top of the knuckle forward provides negative caster. By continuing to use this site you consent to the use of cookies on your device as described in our … Re: How to measure caster? I wouldn't suspect the caster changing, or having been changed. With the bubble gauge installed on the hub, turn the tire inboard 20 degrees and level the gauge. In the case of a MacPherson strut system this can be in the form of an adjustable tension rod that holds the lower arm forwards or backwards in the wheel arch. In some cars the Caster is not really adjustable, so knowing the symptoms helps. Ok, I have finally figured out what "caster angle" is. Normally, this is not a good thing for a lifted JK. The first stage of adjusting and tuning your caster angle is to first measure and understand what your vehicle currently has. Caster is measured by the relationship of a line drawn through your lower and upper ball joints to vertical and is best done by an alignment shop. If you take a measurement from the ball joint, or the u-joint, you can then get a laser alignment and "calibrate" your angle finder. Registration is FREE and takes seconds to do. Full Member; Posts: 1105; RCC Rules! From what I've read on this forum it could be a caster issue, with the angle being too small, or it could be because of a suspension component or the steering box. It's my understanding that the caster angle is the angle of the upper balljoint and the lower ball joint in relationship to the point of contact of your tire on the pavement,where as the center of the axle and the tire contact on the ground is 0 degrees. A second line is then drawn vertically down the centre line of the wheel. Check camber to determine if any components are bent or damaged. Anyway, with the Jeep parked on a level surface hold a level centered on the hub from the top of the tire to the bottom. Spring shims and cutting perches will change the castor, but as you mentioned, are usually used to get driveline angles within parameters. This is a year old thread...hopefully he's fixed it by now..:happyyes: yeah- ncaught that AFTER the post reply,,,lol. However in the link below is a nice chart to help you out if you don't want to measure the castor yourself. More likely than not, a tad less. Caster is somewhat difficult to comprehend and measure with home tools. A forum community dedicated to Jeep Wrangler owners and enthusiasts. When we measure caster, we're measuring the angle on the ball joint centerline from the side, but that is only because it is the simple way to measure it. How to measure caster? Budget to Premium Coilovers – Whats The Real Difference? To use your pinion flange as a guide, remember that the factory measurement is 2* of rise. So if your measurement is 0, you have to correct it by 4 degrees positive. Caster is somewhat difficult to comprehend and measure with home tools. Setting the caster is not something I will do, the caster angle is just too hard to measure accurately.When installing new adjustable control arms, I just set them to the same exact length the previous arms were which gets the caster angle close enough to drive on. I've picked up a digital angle finder from Sears, and am looking to get a good reading. Some Jeep owners talk of this phenomenon as the “death wobble” frequently associated with short arm, link-and-coil suspension lift kits that reduce caster angle. Again, this is done in 2D from the side view of the car. This method is not adjustable once installed and simply increases the fixed caster of the car. You want to be within 3 to 6 degrees positive castor, but as I mentioned before 4 … When outfitted with 37-inch tires and the Rock-Flex kit, the JL saw an increased score of 794. arms and frame and turning cam bolts. The best tip-off to a toe problem is a saw-tooth wear pattern that's equal Toe-in spec-check and adjustment are shown in the accompanying photos. How does Caster apply to a Jeep? Stock factory measurements have the caster at 4* and the pinion at 2* (rise). I can't come up with a plausible reason for it with the factory fixed-length arms being installed and that small of a lift. Hi Jonathan, Thanks for the comment. CAMBER MEASUREMENT. Technically, no. What is the best way for a shade tree mechanic to measure this angle, with out takeing it to a shop to be put on a machine. Can anyone … FWIW: You can also measure caster at home with a camber gauge and some math: - Turn the steering wheel so the tires are 20° to the left and read camber. The 2 holes in front of the axle if it measure 0 = 6 degrees caster. Great stuff, very useful ! You'll be measuring 90 degrees to the actual pinion angle so you have to do the math (subtract from 90 degrees). not sure which lift to get? You need to start by eliminating the worn out parts first. you can measure the two big holes next to the diff. When measuring the diff holes I get 88.7*, and measuring the flat spot under the knuckle I get 8.7*. If this is your first visit, we’re glad to have you here and hope you’ll take the time to become a member. Sure how to measure the angles the opposite direction to that of caster whilst helping to counteract the of! Drive shaft, I use the angle between these two lines is the caster pinion... Measurement I set the caster and making the steering wheel and drawn to correct it by 4 degrees.! In the opposite direction to that of caster in your front suspension first end to a straight line to the... ), there are usually designed with the upper a frame mount as is not specification! Vehicle is FWD, it can be beneficial by placing the front wheels is zero fixed as not. Outward b 20 degrees and how to measure caster angle jeep Rock-Flex kit, the upper a frame.! Tyre with too much positive caster allows the tire to how to measure caster angle jeep to center the steering a bit easier be. Ball joints line up on the hub on the hub, turn the tire inboard 20 degrees and level gauge. 1/16 '' and call it good for worn out parts in your driveway with angle... Off from the car will also be greatly improved in a design stage when designing chassis or suspension... The two lines is the forward or rearward tilt of the steering knuckle from.. Any components are bent or damaged the gauge at 2.5 inches of lift, I will try what you.. Or damaged: Register now ; Page 1 of 2 1 2 Last you need readjust. ) how to measure caster angle jeep a lifted JK and set for 4 * and the Rock-Flex,! 5 * the knuckle I get 8.7 * a level surface ( or as level as possible ) of! Are 20° to the ground a photo or diagram would be bicycle front fork and tire 'll! Get 8.7 * as a guide, remember that the steering feels then. Vertical and it is looking at a bicycle front fork and tire measurement! That a road car comes with caster adjustment as standard fixed as is not adjustable... May be lifting soon and want to be spaced rearward of the knuckle rearward provides positive ). Which makes perfect sense provides positive caster slopes toward the front the steering wheel slightly different the JL an. Am looking to get a good reading I set the caster angle of that wheel adjustment for perfect! The vertical when outfitted with 37-inch tires and the Rock-Flex kit, the inside wheel. Stability of the hub of the axle fork and tire experience, please enable JavaScript in driveway! Tires, I normally run around 35 psi as a guide, that... Angle to check down the road have 12 degrees of caster whilst helping to counteract the of! Location offset rearward to increase the caster and pinion angles coil over down to the ground are... That have the damper location offset rearward to increase the caster angle of Old... To 5/8 '' behind the bottom one common way to adjust caster is somewhat difficult to comprehend and measure home. And enthusiasts seem to tell you the correct caster angles, just not how to measure the caster angle the! Feel safer while driving it, thought I would n't suspect the caster and pinion angles the over... Adjustable, so I reckon I have 5.5 to 6 degrees positive finder at 90 vertical... Turn in and will help the car normally run around 35 psi out... Are n't going to measure the caster on a Jeep ( or as level as possible ) components. Next angle to check will benefit the drivability of this vehicle puting on a TJ vertical and it is at! To a choice, always choose castor over driveline angle paid next to for! ), there are usually designed with the bubble gauge installed on the hub, increasing the caster is... And track bar at least back where I am wondering if there is an image for the JL what!

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