System Includes: Acceleration/Deceleration Cylinder Kit - Chassis Mounted, Variable Speed Controls, High Load Scales (2200lbs/Wheel), Single Load Cell (15" Scale Pads), Integrates with Data Acquisition Systems, On-Line Video Training, Manual Input Wheel Load & Position Graphing Calculator
System Benefits: Fully Upgradeable, Portable, Wheel Base & Width Adjustable, Works with all Chassis Types
How to Use Your Pull Down Fixture For Performance Gains
1. Use the fixture to establish your “track height”. This is the desired attitude (travel & roll) of the chassis on the track. Be sure to allow for tire roll clearance. 3/4” at the cross member & 1.5” at the nose.
2. Adjust your spring/bump stop combination to reach the needed wheel loads at your track height. This is where you will set your bump stop timing, choose primary spring rates, bump stop rates and shims. During this process, you will watch wheel load curves and make sure you are not “spiking the load” causing grip loss.
3. The first two steps will eliminate chassis over traveling and track contact, causing grip loss.
4. Now that you know where the car will travel to, you can adjust dynamic balance. Front/Rear weights, Cross, etc.
5. Next, adjust the dynamic bite through acceleration while maximizing total forward traction. Adjust trailing arm angles, droop limiter and unsprung weight.
6. With dynamic bite set, measure and adjust the acceleration curve to match the type of track. Longer curves are better for low grip conditions, short curves for high grip conditions. 5th Coil/Pull Bar rates and positions along with droop limiter timing adjust this.
7. With loads/travels and balance set, you need to set wheel positions at track height. Camber, Caster, Bump Steer, Rear End Lateral Position, Rear Steer, etc.
8. With the wheel positions set at track height, bring the car back to static (tech height) and record where the positions come back to. This is for your reference.
9. After these steps, you can test any combination of set-ups. When making spring/bump stop changes pull the chassis back to your baseline wheel loads to learn what the new travel will be. Through testing, you will know what your optimum dynamic balance is for each track and be able to adjust to it.
10. Different style tracks will produce different wheel loads. You will determine the wheel load for each track by testing, measuring chassis travel and then pulling the car down to that travel. Once you have the wheel loads recorded for each track, you can test set-ups for each track all year long. You will notice higher wheel loads when the track has more grip and lower loads as it gets slick. You will be able to adjust travels for that easily and have your adjustments preplanned before getting to the track.
11. You will watch for suspension binds as you travel the chassis under load and correct them.
12. You will find bent items (spindles, axle tubes, control arms, etc.) and correct them.
13. You will ensure that the chassis moves freely under load and repeats itself.
14. Finally, you will compare set-ups and other chassis to identify unique characteristics that can be reproduced.
15. Ultimately, the pull down fixture will allow you to fine tune set-ups and develop new set-ups for an advantage. It will eliminate time consuming errors at the track, costing you valuable practice time. It will help uncover chassis problems that cause performance loss far quicker than visual methods. And it will increase your knowledge of the chassis and suspension tremendously without excessive test days at the track.
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