8th ‘XV4’ 22Hole Pistons

The new VRP 22 hole XV4 piston builds on the VRP 20h technology. It is designed to be a compliment to the 20h and give the racer a different ‘high flow’ piston option for tracks that are rough and bumpy. The new 22h piston will be able to absorbe ruts and bumps better, yet still land great and settle super fast like the 20h.

The 22h piston design comes from months of studying and testing how holes interact with other holes, the fluid dynamics between them, the spacing, and flow patterns. The inital pack has been moved a small amount deeper in the stroke over the 20h, as well as given the piston the ability to ‘blow by’ under extreme impacts like edged ruts.

It is very unique. There are 3 sets of holes that that work together to produce the outcome. In a way like lines of code for an app, that put together makes the app look and function.

The 22h gives strong grip on loose surfaces, increasing the control and ease of driving. In grippy conditions, the 22h allows the buggy to roll into the suspension more, reducing edgyness and making it easier to drive, which results in higher corner speeds.

Oil range for the 22h is 500 to 800, depending on grip and track temps. At a larger track which is higher speed, bigger jumps, medium bumpy/rough, testing oils were 700 front and 650 rear +/-.  At a smaller, looser, very bumpy track, the testing oils were 600 front and 550 rear +/-.  These were at around 85 degrees. An easy routine way to adjust oils is to drop test the buggy and adjust so it doesn’t bottom. For larger, higher grip tracks, higher speeds, medium bumpy/rough drop from 12 to 14″. For smaller, tighter, loose, slower speeds, extreme rough, drop test from 8 to 10″. This will account for the differences in each buggies geometry as well as track temps.  In the video, the oils are 600 front, 550 rear at 75 degrees.