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CLCG Newsletter

Tech Talk

OK, Corvette aficionados, I was asked to discuss alignments.  The first section is general information followed by Corvette specifics for the style of driving you want to set up for.  Combine this with the tire selection article, tire changing article and now alignment…..and well you are now a resident expert.

Enjoy

Tech Talk Dan

Alignment is one of the key maintenance factors in getting the most wear and performance from your tires. In addition, wheel alignment provides safe, predictable vehicle control as well as a smooth and comfortable ride that's free of pulling or vibration. Today's modern suspensions require a precise four-wheel alignment (yes that is you Corvette owners) that can only be achieved through a modern alignment system. This applies to both front and rear wheel drive vehicles.

Alignment Basics

Aligning a car or truck involves the adjustment of the vehicle's suspension, not the tires and wheels. The direction and the angles that the tires point in after the alignment is complete, however, are critically important. There are five factors involved in setting the alignment to specification: caster, camber, toe, thrust and ride height. The following brief discussion of each aspect will help you understand the process and spot potential problems.

Caster

Caster is the angle of the steering axis (the part of the suspension that supports the wheel and tire assembly). Viewed from the side of the vehicle, an imaginary line drawn between the    centers of the upper and lower ball joints forms an angle with true vertical; this is defined as caster. The illustration to the right shows whether this angle is referred to as positive or negative. Caster is important to steering feel and high-speed stability. 

Camber

Viewed from the front of the vehicle, camber describes the inward or outward tilt of the tire. The illustration to the right shows whether this tilt is referred to as positive or negative. The camber adjustment maximizes the tire-to-road contact and takes into account the changes of force when a vehicle is turning. Camber is the one adjustment that can be set according to driving habits. Generally, if you drive more aggressively when cornering, more negative camber can be set. If you drive on highways and do very little hard cornering, more positive camber can be set. 

Toe

Viewed from above the vehicle, toe describes whether the fronts of the tires are closer (toe-in) or farther (toe-out) apart than the rears of the tires. The illustration below shows this relationship. Toe settings vary between front and rear wheel drive vehicles. In a front wheel drive vehicle, the front wheels try to pull toward each other when the vehicle is in motion, which requires a compensating toe-out setting. A rear wheel drive vehicle works just the opposite, necessitating a toe-in setting. Stated differently, toe is set to let the tires roll in parallel (at zero toe) when the vehicle is in motion.

Ride Height

Ride height is simply the distance between the vehicle's frame and the road. This is the reference point for all alignment measurements. Vehicle customizing will often include raising or lowering the vehicle. Don't forget to have your vehicle aligned afterward. Also, this rule applies if you put a taller or shorter tire on your vehicle.

Misalignment and Tire Wear

By now you may have concluded that poor tire wear and misalignment are closely related. That is true, of course. But what can be done to minimize this condition? It turns out that many of these misalignment conditions can be easily "read" by your tire dealer; and they can recommend the appropriate solution, which will be "get an alignment." For your assistance, the following troubleshooting guide will help you see what your tire expert sees. Armed with this knowledge you can check your tires periodically. Remember that a knowledgeable glance at your tires on occasion can pay big dividends.

Misalignment Condition Tire Wear Symptom
Incorrect Camber Setting Premature smooth wear on either inside or outside shoulder
Incorrect Toe Setting Feathered wear across tread, raised tread block edges
Incorrect Caster Setting Excessive shoulder wear, tread blocks show "heel-toe" wear pattern.  
Unequal Caster setting (either right or left side is out of specification) Sharp pulling necessitates steering compensation and feathered wear.  
Unequal Toe setting (either right or left side is out of specification) Sharp pulling necessitates steering compensation and feathered wear.  
Combination of two or more settings are out of specification. Irregular tread wear with feathering and smooth spots  

This is not meant to be an exhaustive listing of all the possibilities. However, if you learn to spot these symptoms early, you can get a lot more wear from your tires. Remember that tires take the brunt of many problems. Simply replacing the old ones is not a solution. Shortly after replacing your old tires, your new tires will begin to reflect the same problems if you have not made the appropriate alignment changes.

Worn Parts

Very often a worn suspension part is the cause of an alignment problem. On older vehicles, worn springs can lower a vehicle's ride height, altering its geometry and creating misalignment (all alignment settings refer to ride height). Weak springs can also contribute to uneven or "cupped" tire wear. Another common problem is worn ball joints. The symptoms here are erratic handling, slow steering response, and irregular tire wear. Finally, worn tie rods can allow the tire to wander left to right, effectively changing toe as the vehicle rolls down the road. Irregular feathering will develop on the tire tread when this is the problem. Again, this is not an exhaustive listing, but if you stay alert to these common problems, it may help you schedule an early visit to your mechanic and save on tire wear.

Front 63 - 82 Corvette

Daily Driver

Advanced Street

Autocross Baseline

Track Baseline

Toe

1/32" in

0"

3/16 out

0-1/16 out

Camber

0° neg

.25° neg

1.5-2° neg

1-2° neg

Caster

2.75° pos

2.75° pos

2.75° pos

2.75° pos

Caster (w offset a-arms)

4.75° pos

4.75° pos

4-4.75° pos

4-4.75° pos

         

Rear 63 - 82 Corvette

Daily Driver

Advanced Street

Autocross Baseline

Track Baseline

Toe

1/8" in

1/8" in

1/8"-1/4" in

1/8"-1/4" in

Camber

0° neg

.50° neg

.75-1.5° neg

.75-1.5° neg

         

Front 84 - 96 Corvette

Daily Driver

Advanced Street

Autocross Baseline

Track Baseline

Toe

1/32" in

0"

3/16" out

0-1/16" out

Camber

0° neg

.25° neg

1.5-3° neg

1-3° neg

Caster

5-7° pos

5-7° pos

4-5° pos

4-7° pos

         

Rear 84 - 96 Corvette

Daily Driver

Advanced Street

Autocross Baseline

Track Baseline

Toe

1/8" in

1/8" in

1/16" in

1/8" in

Camber

0°

.50° neg

.75-2.5° neg

.75-2.5° neg

         

Front 97-02 C-5 Corvette

Daily Driver  

Advanced Street  

Autocross Baseline

Track Baseline  

Toe

1/32" in

0" to 1/32" in

1/16" in

1/8"out-1/32" in

Camber

0°

1/4° neg

1/2° neg

1/2° neg

Caster

6-7° pos

6-7° pos

4-6° pos

4-6° pos

         

Rear 97-02 C-5 Corvette

Daily Driver

Advanced Street  

Autocross Baseline

Track Baseline  

Toe

1/16" in

1/16" in

1/16"-1/4" in

1/8"- 1/4"in

Camber

0°

1/2° neg

1/4 - 2° neg

3/4 - 2° neg

These wheel alignments are not factory standards. These are derived from tests, professional drivers and chassis engineers.  You should always consider driver, fuel and cargo weights when your Corvette is aligned. Please note that these specs are symmetrical. For example, when we recommend 1/8" toe in, that indicates 1/16" on each front wheel for a total of 1/8" total toe in.

Daily Driver - These specs are designed to minimize tire wear and dynamic forces on front end parts. Driver effort is minimum, the car will steer very "light" and may wander or be "darty" on road with wear ruts. If you are uncomfortable with this feeling, toe the car in up to a maximum of 1/8" total toe in.

Advanced Street - These specs are designed to give an even quicker steering response with minimum tire wear. If the car is "darty", toe the car in. By toeing in, you may loose some turn-in qualities gained by the initial specs.

Autocross - These specs are a good baseline to start from. The driver must take into consideration that size, compound and condition of the tires. The chassis is affected by the valve package in the shocks, spring rates and sway bars. The Autocross course design and the condition of the surface will also have a bearing. These specs do not work and are not recommended for street use because of adverse tire wear. The car will act "nervous" when ever changing street surface.

Track - These specs are by far just a baseline. Those of you who race know alignment specs will change based upon weather, track and unique setup. These specs can also change on each corner of the car and driver to driver.

Other Tech Talk Topics
Suggested Products Paint Care Mufflers Oil Tires
Fault Codes American Le Mans Racing Extended Warranties Tire Installation and Balancing   Alignment