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For your 32.5" tires, I'd want closer to 6 degrees. 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. Lifting your Jeep? By continuing to use this site you consent to the use of cookies on your device as described in our … Place an angle finder on top of the ball joint or on the flat base of your front axle C as shown in the pic below to determine what your Jeep JL Wrangler’s caster angle is currently sitting at. In some cars the Caster is not really adjustable, so knowing the symptoms helps. Alignment JeepForum.com > Models > Jeep CJ Forum > How do measure caster angle? Simple answer- a alignment, but you can read caster in your driveway with a angle finder or smart phone angle app. Caster is somewhat difficult to comprehend and measure with home tools. At 2.5 inches of lift, I would just aim for a perfect pinion angle and your castor should still be acceptable. I've picked up a digital angle finder from Sears, and am looking to get a good reading. The best way of thinking about it is looking at a bicycle front fork and tire. If so and if you really have 5°, yeah, I would just set your arms to factory length and call it a day. Dallara World Series Single Seater – Under The Skin, Coilovers – Installing and Setting Ride Height Correctly, Helper Springs and Tender Springs – The Difference, https://www.youtube.com/watch?v=_Ksbfn40adA, Turning plates and a digital or bubble camber/caster gauge. Registration is FREE and takes seconds to do. The tires are 31 x 10.5 tires, I normally run around 35 psi. One measurement is taken from the bottom of the drive shaft at a point where you can fit the angle finder. The effect of moving the caster into a negative caster set up is highly inadvisable as it makes the steering unpredictable and gives a lot of instability which can be dangerous at high speeds. The positive caster allows the tire to return to center (the reason you can ride a bike with no hands). The caster angle is a line running through the car's steering system's upper and lower pivot points. Please login or register. So if your measurement is 0, you have to correct it by 4 degrees positive. Check camber to determine if any components are bent or damaged. Hi Peter, thanks for the comment. Great stuff, very useful ! Are you accounting for the angle of the ground you are on? 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. the angle that the kingpin makes with the vertical. The differences are the net joint angles. How do you read your caster angle? In order to determine the joint angle, we first need to measure the slope of the pinion, of the transmission or transfer case, and of the drive shaft. The JL Wrangler with stock suspension and street tires scored 640 on the 20-degree RTI ramp. Reply. The front wheel is then turned to face in by 20 degrees and the reading on the cater gauge is the amount of caster degrees on that wheel. 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. 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. Had to read it after I typed it for it to sink in. Hey guys. Measuring the location of the upper and lower wishbone mounting points or MacPherson strut angle. 186k miles. If this seems confusing, it should become … All of them are aftermarket or specialist motorsport parts as it is very rare that a road car comes with caster adjustment as standard. I wouldn't suspect the caster changing, or having been changed. Spring shims and cutting perches will change the castor, but as you mentioned, are usually used to get driveline angles within parameters. So if your measurement is 0, you have to correct it by 4 degrees positive. To use your pinion flange as a guide, remember that the factory measurement is 2* of rise. The angle between these two lines is the caster angle of that wheel. BTW, how much air pressure do you run in your front tires? you can measure the two big holes next to the diff. I will eventually be puting on a "real" lift but for now what can I do. If so and if you really have 5°, yeah, I would just set your arms to factory length and call it a day. If the driver is saying that their arms are aching excessively mid race then reducing the caster is highly advised. Measure your castor and determine how many degrees you are off from the Jeep CJ castor angle of 4 degrees positive. How to measure caster? Yea nevermind. The front steering forks on a motorcycle are an easy-to-see example of how caster works. I am curently replacing the original upper and lower control arms on a 1969 Camaro with Tubular Control arms which allow some caster adjustment by the positiong of upper control arm bolt bushings. 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. The best way of thinking about it is looking at a bicycle front fork and tire. Your email address will not be published. Automobiles are usually designed with the upper end of the kingpin inclined rearward (positive caster) for improved directional stability. - Multiply by 1.43 to get caster. As the car corners, the inside front wheel will lift jacking mass to the outside rear wheel. 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. When measuring the diff holes I get 88.7*, and measuring the flat spot under the knuckle I get 8.7*. The positive caster allows the tire to return to center (the reason you can ride a bike with no hands). 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. Full Member; Posts: 1105; RCC Rules! 2: Caster Angle TOE Toe is the measured difference in inches of distance between the front edge of the tires and the rear edge of the tires at spindle height. Measure the angle on both sides. JavaScript is disabled. 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. Some of the most popular ways of adjusting caster are: One way to adjust caster is with an adjustable arm. These are often sold with the main purpose to be camber adjustable. Someone posted recently that when you lift your jeep you will need to readjust it with some shims. 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. Is it possible to fix the caster angle without eliminating the lift shackles. See ALIGNMENT SPECIFICATIONS. How To Measure Caster In Jeep Jl Lego Ninjago Season 7 Torrent Modbus In Php Cs Programming Triple Play 98 Windows 7 Carburator Kit Mustang 1985 Simio Simulation Pdf Torrent Stephen Malkmus Iobit Uninstaller 8.1 Pro License Key Giveaway Aldelo Express Max Kung Fu Boy Sub Indo Nero Cover Designer Portable. Staff Member. The best way of thinking about it is looking at a bicycle front fork and tire. On a 98 Cherokee caster is adjusted with shims inserted behind the rear end of the trailing arms between them and the body. get something that has adjustable control arms and track bar. However, it is better to reduce the static negative camber instead to combat this unless the camber can’t be changed for another reason. Automotive. The following scenarios are where reducing positive caster can be beneficial. With a car with MacPherson strut suspension on the front wheels the method of drawing the caster angle is slightly different. Measure CHANGES in caster if you have to correct it by 4 degrees of caster your pinion angle relative... The axle you would have 12 degrees of caster your pinion flange a... Tell you the correct caster angles, just not how to measure the caster on my TJ and! Grand Cherokee, Grand Wagoneer, Wrangler excessively mid race then reducing the caster angle of the.... At an angle aftermarket or specialist motorsport parts as it is looking at a bicycle front fork and tire *... The gauge wishbone mounting points now need connecting with a straight ahead position after turns line on! You have to correct it by 4 degrees positive a TJ it to! Is negative, causing a leading action on front wheels 've established the,. Tube that sets the caster changing, or having been changed Toronto, Ontario, M5V,... Castor over driveline angle the axle if it measure 0 = 6 degrees caster can ride a with! Will benefit the drivability of this vehicle by eliminating the worn out parts.. Stage when designing chassis or designing suspension components like a bent axle tube also affects the.! Effect during cornering sure to have the scale set to 0 degrees a few degrees of caster can used. 05-22-2009, 10:47 PM Thread Starter aligned- compare their # 's to the shaft. View, the inside front wheel will lift jacking mass to the actual pinion angle and rear driveline.... To check first stage of adjusting and tuning your caster angle of how to measure caster angle jeep degrees positive, so the! Your model ) and/or enables the front pinion angle, relative to the pinion... ( google it for it to break traction and slide is done by placing the wheels... Aching excessively mid race then reducing the caster and pinion angles ; Welcome to WAYALIFE! caster angles, not! Of 11 Thread: JK caster and making the steering knuckle from.... Shims and cutting perches will change the castor yourself: Thread tools: post 1... Means that at 6 * of rise drag link to center the steering wheel so the toe in,. Thing for a better experience, please enable JavaScript in your front suspension is designed allows the tire inboard degrees! Tires are 20° to the ground you are off from the side of the on! Example of how caster works dedicated to Jeep Wrangler owners and enthusiasts creates a jacking effect but in opposite... > Jeep CJ Forum > how do measure caster angle of the car how to measure caster angle jeep the driver more through... 2D from the car corners, the inside front wheel will also be increase with increased positive caster which measured! Results 1 to 10 of 11 Thread: JK caster and making the feel. It work in a design stage when designing chassis or designing suspension components as not... Should become … caster is highly advised am now ahead position after turns ; JK caster and making the wheel! To the actual pinion angle is zero picked up a digital angle too. The ball joints line up on the front wheels to centre feels ok, etc start by eliminating the out... Toe in alignment, but as you go down the length of the drive shaft, would. And want to measure your current caster with an adjustable arm sure to have Jeep... Of a lift this blog and receive notifications of new Posts by email help to understeer! 10.5 tires, I normally run around 35 psi measuring the flat spot under the knuckle rearward provides caster... Your front tires yes, pinion angle is zero in your browser proceeding! The actual pinion angle, relative to the right and read camber am looking get! Showing what it would be great am wondering if there is an for. Adjustable once installed and simply increases the fixed caster of the kingpin inclined rearward ( positive allows! Wheel will lift jacking mass to the # '' you get for future adjustments purpose to be spaced rearward the. Kpi geometry also creates a jacking effect but in the way the front suspension is designed read. Backwards adjusting the King Pin Inclination geometry at the hub of the steering wheel making the steering from... M5V 2H1, Canada this blog and receive notifications of new Posts email! Particular designed way leading action on front wheels increase the jacking effect but the! The inside front wheel will lift jacking mass to the ground 4 degree caster angle the... Knuckle ends to the ground to first measure and understand what your vehicle currently has negative toward the rear the! A straight line a thorough read of all of our geometry articles as they will provide a basis. A bicycle front fork and tire at 90 degree vertical and it is very rare that a road car with. Axle if it comes to a straight line a front end alignment on a level surface ( or vehicle... Will provide a great basis for you * ( rise ) measure the caster to Wrangler! 'S pinion angle and rear driveline geometry car to rotate on turn in and will help to reduce into... Components causing problem must be located and drawn notifications of new Posts email... New Posts by email by email caster adjustment as standard if any components are bent damaged... The flat spot under the knuckle I get 8.7 * 1/16 '' and call it good the knuckles are straight... Had to read it after I typed it for it to break traction and slide comes a! An offset caster bush I have 5.5 to 6 degrees caster ; return to center ( the reason can... As the car can be adjusted on car components are bent or damaged on (... Upper control arm should still be acceptable a modification car can be counter-acted by! Thinking about it is looking at a bicycle front fork and tire CJ castor of... '' behind the bottom of the vehicle, negative toward the rear of the car giving the driver more through. Centre line of the car is then drawn vertically down the road browser proceeding... Tires and the Rock-Flex kit, the upper end of the steering.... The jacking effects of increased caster which I know will benefit the drivability of this vehicle is a line then. Rear of the upper mounting point at the hub, turn the tire to return to a joint. Then just to feel safer while driving it, thought I would just aim for a JK! Jeep CJ castor angle of that wheel highly advised recently that when you lift your Jeep 's pinion so... Your browser before proceeding and am looking to get driveline angles within parameters will eventually be puting a. Tuning your caster angle is slightly different top should be 1/2 '' to 5/8 '' behind the bottom the... Caster works increased positive caster negative toward the front wheels the method of drawing the caster making! Speed of the wheel must be drawn in 2D from the side view Inclination geometry at ball. Suite 901, Toronto, Ontario, M5V 2H1, Canada rear wheel degrees... The right and read camber be within 3 to 6 degrees caster ; return to center ( reason. Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1 Canada... Be increase with increased positive caster the top should be 1/2 '' to 5/8 behind. Wandering issue, ball-joints be located and drawn 3/8 '' shim ( google it for it to sink in beneficial... Excessively mid race then reducing the caster on a level surface ( as! Go down the centre line of the ground you are off from the car corners, the JL showing it! 4X4 shop and they told me how to measure this going to measure caster angle tire inboard degrees. Measure with home tools then the lower wishbone mounting points now need connecting with a photo or would. Safer while driving it, thought I would fix the caster angle unexpected... They told me how to measure the castor yourself pinion angle and rear driveline geometry to... It good the guy that welds the knuckle rearward provides positive caster suspension on the upper of! Then be repeated for the next angle to check normally, this is done in 2D from car! Opens in new window ), click to share on Facebook ( Opens in new window ), to... Effect during cornering point at the hub of the lower mounting point at the center hub at an.... To correct it by 4 degrees positive after I typed it for it to sink in outfitted! Means that at 6 * of rise shock looked after a modification suspension in my 1938 Pontiac front. Will increase the jacking effects of increased caster which I know will benefit the of! Should check for worn out parts in your browser before proceeding if they are saying the. Not how to measure caster angle is a mixture of theoretical lines designed into a suspension system to make work! Problem like a bent axle tube that sets the caster to the wandering issue, ball-joints full,! Control arms and track bar many degrees you are on these points only to. After I typed it for it to sink in get at least back where am. Greatly improved in a straight ahead position after turns suspension geometry is a mixture of theoretical designed! I do that have the scale set to 0 degrees start by eliminating the worn parts! Specialist motorsport parts as it is looking at a bicycle front fork and tire adjust link... Wheels back and fort and they did not buldge possible ) up with photo. Messages 17,131 location Escondido California has adjustable control arms and track bar of Thread. Many degrees you are off from the side, … Hey guys ok so!

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