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It definitely looks wild, but it also can result is horrendous driveshaft alignment–the results of which can prove disastrous. * Seat Belt Mounts If the pickup point is located about this line, the body will separate upon acceleration. * Chrome Moly Rod Ends Used On Four Link Bars * Carbon Fiber Removable Gauge Cover Clamps Dragster | Jr. Dragster | Altered | Cars 4 Sale | Home. *Front and Rear Protection Plates

Some other food for thought is this (again, from Bickels’s tuning bag of tricks): Automatic transmission cars along with lower torque stick shift cars work best when the IC point is from 1- 2 inches above the racing surface. In a perfect situation, the front pickup point should be located near the neutral line. Establishing Four-link Instant Center. * Brake Line Bulkhead Mount Tab

The farther back you move the IC, the higher it must be.”.

“Short high intersect points create traction for the least time, but react fast.”. The company has built Nostalgia Top Fuel and Nostalgia Funny Car vehicles, as well as Top Alcohol Funny Cars and Pro Mods. *Steering Wheel That location relative to the rear axle centerline will make a difference in performance, even if the IC point remains the same. It should be no surprise to anyone reading this that Bickel has built more than his fair share of championship winning race cars, and he is certainly no stranger to tuning suspension systems. Ive find that mine (stick car) is happier with an additional 1-1.5 turns of preload, Pingback: Four link tuning - DODGE RAM FORUM - Dodge Truck Forums, Pingback: Figure Four: A Guide to Tuning Your Four-Link Suspension System | MEP Precision Racing, Pingback: Launch Control: The 6 Acceleration Forces You Must Control to Win at the Dragstrip - OnAllCylinders, I would love to see something about stick style suspension on a dragradial car, I disagree with most of what was said in above article that was the way it was done 20 years ago all info is outdated. This setup will ultimately work well and prove very stable. * Helmet Hook On Cage * Carbon Fiber Nose Piece *Seat Belt Mounts * Adjustable Throttle Pedal Stop

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Following this initial violent hit, there usually wasn’t sufficient load transfer to actually maintain traction and keep the tires hooked. I’d like to hear some specifics. * Aluminum Steering Wheel *AFCO Shock. Because the respective brackets found on something like a four-link are under load during acceleration and braking, they must be stout. The other consideration Bickel tells us about is the amount of torque your engine can deliver to the drivetrain coupled with the type of drag slicks you have. The instant center length can actually affect the overall (race car + driver) reaction time. “The sidewalls of these tires are tall and very flexible, acting like a sort of spongy suspension system. * Cable Mounts For Throttle/Shifter/Parachute

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As a result, the forward attachment point is called the pickup point. The car will neither show squat, nor will it encounter excess body separation.

* Tie Rods with Rod Ends * Mounts for Switch Panel However, as we noted much earlier in this article, if too much power is applied to a long IC point, tire shake can result. All parts and pieces are of the finest quality that the industry has to offer.

To complicate things, there has been quite a bit penned over the years regarding suspension setup–some right and some wrong (some very seriously wrong). Opposite to this, if insufficient force is applied to the tire, it will simply spin without accelerating the race car.

Work and price satisfied by both parties. Not liable for car or parts left in shop 30-60 days after completion.

I'm not sure how to cure this. * Battery Ground Tab * Lightweight Body Tabs & Fasteners

*Wishbone As you brake, the forces are reversed. When it comes to IC height, Bickel has this to add: “The farther forward you move the IC, the lower it must be,” he said.

There is no comparison to any other 4-Link software available! That changes things, and we’re not finished with it yet. * Reinforced Wiring Slots in Chassis Between an excessive amount of tire wadding coupled with the reduced traction following the violent hook, elapsed times can suffer (no brainer, we’re sure).

Typically the line of thought states that the neutral line of a drag car can be determined by extending a line level with the height of the center of gravity (CG) until it crosses a vertical line through the front spindle. The ladder bar prevents excessive suspension wrap up by pushing up on the frame at the point of forward connection (basically the point where the upper and lower bars of the ladder bar intersect). Once the front tires are in the air, I do not believe that they have an effect upon neutral line location. * Master Shutoff Switch & Mount Bickel tells us that if you drive the tire down too hard by way of the IC location, it tends to fold up the sidewalls, which in turn makes for poor surface contact. Would you care to elaborate on what the article states. The respective bar on each of the car also pushes down on the tires and wheels. * Ground Effects Lower Body Lip Material Bickel states that if your reaction times are good, a long IC point (50-60 inches is generally more desirable than a short one (50 inches or less).

* Grade 8 Hardware Installed on Assembly of Car If the pickup point is located below this neutral line, the body will squat. *All 4130 Heim Joints * Master Cylinder with Mount & Linkage

If you look closely at Bickels’s illustration (below), it’s easy to see there are many possible IC locations in a four-link.

*Pedals Gas and Brake * Adjustable Throttle & Brake Pedals Used by many of the best teams in drag racing, Chassis Master is easy to set up and input information. You have to pick the one that works best for your particular car, but it’s not cut and dry.

There’s absolutely no voodoo or black magic involved. * Clear Windscreen - Lexan “In practice, I find that pickup point location must be changed, depending upon race track conditions and vehicle performance. So far so good, but Bickel points out that there are several difficulties with this method. *Dashboard and Drilled for Gauges That all makes sense, but over time racers quickly discovered that changes in that pickup point location can have a considerable influence upon the behavior of the chassis.

I hope that my link works for viewing my data. *4- Link Bars If, for example, the pickup points were short and high, then the launch would prove violent. * Taillight & Mount

* Weight Box Mounts When a drag car launches, the rear-end wraps up. How can it be out date??. I feel a 4 link is superior to ladder bar, but more time consuming to set up .When the 4 link is right their is nothing better for a high horse power car, Hello my name is Robert article from Mr bickel is very informative it leads to a good starting point espically if someone has it allover the place you want the car to move in a forward motion with a minimum wheel stand all is done is a brakage of all peices below chassis.Every race car is different and the track is the best to test a given set up my experience is the keep it as simple as possible only make one change at a time his article on pinion angle is also helpful.i have been drag racing for over 35 years and still learn something new every day.Thanks to Mr Bickel for very helpful article. The front of the car is lifted or “picked up” by this section. The choices made here will determine the length and height of the instant center. Pingback: Monte Makeover (Part 2): Transforming an '86 Monte Carlo into an Autocross Killer Continues - OnAllCylinders.

What you’ll see below is Bickel’s personal take on ladder bars and four-link setups. * Carbon Fiber Floor with Tunnel The bottom line here is you have to take your time setting up the four-link for your particular car.

Remember when we initially talked about location of the bars in the four-link? *Aluminum Seat Required fields are marked *. *Complete Body and Front Nose

* Parachute Mount/Anchor/Release Handle Bickel tells us that this arrangement will tend to hit the tires less violently, but it can also create more total load transfer to the rear tires. Lift bars, slapper bars, Super Stock springs, leaf links, ladder bars, three-links, four-links, and torque arms (there may be others too, but it’s a start).

What we need is an idea of something called the “instant center.”. The neutral line is then represented as a diagonal line that intersects this location and the center of the rear tire-to-pavement contact point (see illustration 3 below). Spitzer has built NHRA and IHRA event-winning dragsters in the Top Fuel, Top Alcohol, Top Dragster, Hot Rod and Super Comp categories (4-link and hard tail). Bickel offers a very simple explanation to choose the IC pickup points: “Long, low intersect points create traction for the longest time, but react slowly,” he said. Experience has shown us that the pickup point distance from the rear axles is at least as important as its height. Where they intersect is called the instant center (see Illustration 4 below). Then tighten everything up and put the car back on its wheels. * Fill and Drain Plugs On Rearend Housing I am setting up a 4-link in my 74 corvette.

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of gravity when you don’t use it? Your email address will not be published. * Four Link Rear Suspension So instead of a short, high pickup point, what if you had a long, low pickup point? Why go through the trouble of weighing the car front to back to find cent. But there is one truth: All race cars all have a neutral line that determines how the chassis will behave (see illustration 2 below).


The closer to the housing the upper bar is, the less the car tends to wheel stand. Bickel says that should you decide to change the length of the IC, you must also change the height in order to maintain the same anti-squat relationship.

*Arm Assembly
Consider what happens when the ladder bars push up on the chassis at the pickup point.

They work best when you limit the rear movement to as little as possible with an IC point on or near the neutral line of the car.

When the race car accelerates, the rear-end wraps up, placing the upper bars in tension while the lower bars are held in compression. Optional) Car Price $14,795 USD. * Carbon Fiber Dashboard w/Gauge Holes & Delay Box Hole

Big power stick shift cars typically need to stay 3-7 inches above the racing surface. * Owners Identification Plate, Base *All Dzus Tabs * Entry/Exit Handles On Roll Cage * 245” Wheelbase * Machined Aluminum Front & Rear Motor Plates - .250 6061-T6 Motor Plate with Mounts “For example, racers of high-powered Pro Mod cars often use tires that were initially designed for solid suspension Funny Cars and Top Fuel dragsters,” he said.


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