We know, for example, that the QA1 coilover spring mounted in the stock subframe of our Project Rover first-gen Camaro has an uncompressed length of 10.25-inches with our ride height set and the full weight of the car in place, our compressed length on our spring is 7.25-inches. It is then that our shock adjustments will control that energy and motion.” This energy is a big factor in extending the front end of your car upward on the launch. Smith adds, “This spring compression baseline is crucial at placing stored energy in the front suspension movement. You can find extensive tech sheets for spring selection within the QA1 technical pages of the website. “Whether it be a stock-style spring, one of our stock mount coilover systems, or a true custom mount coilover shock system, your front springs should be compressed by the weight of the car at 30-35-percent of that spring’s overall length,” Smith explains.Īs a starting point, QA1 offers a wealth of charts to select coil springs based on your car's four-corner weights and shock angles. Stored Energy In Your Front Springs Is The Key Starting Pointīefore we get into shock tuning, let’s look at the springs that a racer installs on their front suspension. With input from Steve Smith, the Lead Technical Writer for QA1 High Performance Suspension and Driveline, we will concentrate on your front suspension and provide some in-depth explanation of shock and spring applications, along with their tuning. Mastering the shocks and springs is as definitive as putting the best racing engine together yet missing on the tuneup. Most drag racing and performance suspensions include some shape or size of adjustable shocks as the norm.
#Harley girder front end shock trial#
With the help of the gang at QA1, we’ll work to take some of that trial and error out of the equation to get you in the ballpark and on your way to quicker, more consistent launches. After all, that’s where the drive tires are, right? In reality, though, the rear suspension works in direct concert with the front shocks and springs, and what’s going on up front can make or break you, whether you’re a heads-up or bracket racer. At the end of the day, it’s all about transferring weight adequately and efficiently, and while it’s not rocket science, there’s much to be learned through trial and error to balance the setup. Ok this being said, how does one go about measusuring and figuring the length and rake it should be.Drag racing newcomers often fall prey to the ideology that performance and consistency both begin and end with the rear suspension configuration and setup.
Follow the rake/trail rules and it is about as simple front end as you can hope to build. Use decent bushings in the four links and good pivot shafts or bolts and you can't go wrong. Stick in a hydraulic coil over shock or vintage friction shocks and you have something unique and very functional. If you hunt around and locate an old Indian vintage girder, it hardly gets simpler than that. and the related forum is a gold mine of drawings and info on girders. Unequal arms causes the axle to arc in motion, causing variable trail.which can be interesting under accel/decel conditions (you are warned). One issue I see with the example picture above is the longer lower four link arms. A lot of fine bike parts come off of a band saw and drill press (drill and sand). You definately do not need CNC work to make parts for a girder (nothing wrong with CNC parts, but it is too much tech for such simple parts). The original question seemed pretty basic for someone so well equipt.Ī girder is a simple and elegant design, light and very functional at radical rake and extensions (as opposed to the typical extended hydraulic front end). When I'm done, I don't want someone to walk by my bike and say, "Hey I saw that part in "'who evers'" catalogue" or "My buddy has those same "'what evers'" on his bike, where did you buy yours?" I just want my bike to be as much one off and "made by me" (or some of my buds) as possible.
I am going to have the dog bones and trees cut with a cnc machine and I am going to make the legs. I just need to read up on girders to see about the angles and what not. In my line of work, if you can't get what you need, you make it (specialty tools, brackets, mounts, some parts.ect). I have good metal working skills and an abundance of tools and recources.
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