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Press Release From Vision Racing Products:
www.visionracingproducts.com/main.sc
VRP have developed the VRP 'Tuner' Piston to be the ultimate 'tuneable' piston for RC Racers. Each piston has 22 individual dimples. There are 20 dimples for the normal holes, and 2 dimples located under the rubber valves for additional return. Below is a chart where the holes are numbered like a clock, so they can be used as a way of drilling the piston with holes from 4 to 10 holes. These are just a suggestion. There are many possible combinations. 3 Hole, 7 Hole, 12 Hole, etc. Use a high quality drill bit set like the VRP Piston Drill Sets. And finish the job with the VRP Piston Chamfer Tool. The range for the Return holes are .8 to 1.3mm, with a base setting of 1.1mm. The 'Tuner' Pistons use the same rubber valves and washers as the VRP 'XV3', so everything is interchangeable. And we have listed the pistons by themselves so racers can easily have undrilled sets ready for tuning at the next race. Just swap the hardware over!
Tips:
The VRP Team will use 1.0mm and 1.1mm additional holes in the 10th and 8th pistons to soften the low speed dampening, while not affecting the high speed pack. The very small holes only flow at low speed. They essentially ‘lock up’ under high speed dampening. This gives the buggy more grip because the suspension will absorb small imperfections in the surface.
One idea that helps racers a lot is this: Your running the front suspension ‘into’ bumps and ruts, ....and your ‘dragging’ the rear suspension over bumps and ruts. So there is a big difference. Mainly, the front takes more pack, and the rear takes less. So keep that In mind.
For the best holes - Lay Piston flat on table, use hand drill. Drill a 1mm pilot hole, and then the final hole size. Use the VRP Chamfer tool by finger to finish holes. If using a dremel, be careful. Use low speed.
*Important: The VRP ‘XV3’ Pistons are designed to have a washer under and over them. It is important to run washers and that they are correctly installed. Each set of pistons is supplied with a Washer Hardware Pack to make sure you have what you need to install them.
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