Ohlin’s Coil-Overs
– Ohlin’s Road & Track (R&T) plus Ohlin’s TTX (Twin Tube Advanced)

Ohlin’s Road & Track (R&T)

One of the aspects that sets BRracing apart from all others is the volume of cars that we have worked on.  Having now worked on more than 35k cars, we have real world experience that very few can match.  Combine that we our multiple championships in racing, and we have both experience and proof of what works.  That’s true when it comes to coil-overs as well.  There are a lot of choice out there, but some truly stand apart from all others.  An example of that is the Ohlin’s R&T coil-over.  The Ohlin’s R&T coil-over is unique with it’s implementation of the DFV technology.

Öhlins DFV (Dual Flow Valve) technology is a groundbreaking innovation in the world of suspension systems. It is a high-performance damping system designed to provide unparalleled control and comfort in a wide range of driving conditions. The DFV technology utilizes a unique and patented valve design that allows for very precise control of the damping forces in the shock absorber speed range that is most critical for handling, traction, AND comfort. Utilizing the DFV technology greatly reduces the compromise between handling and comfort that is normally associated with a common single tube damper. The compression and rebound side are tuned individually. Öhlins DFV technology is featured in our entire range of Automotive Road & Track products — whether on the racetrack or the street, this technology delivers exceptional performance and a smoother ride.

HOW DOES IT WORK?
The DFV (Dual Flow Valve) enables tuning the intermediate shock absorber speed range independently from low- and high speed damping. This takes away the compromise between comfort and handling that is associated with common single tube dampers, where the intermediate speed damping can’t be adjusted without affecting low- and/or high speed damping. The Öhlins R&T range uses DFV technology on every single fitment, ideal for drivers who want a versatile upgrade with comfort and agility in one unit.

COMPRESSION & REBOUND

In compression flow (Figure 1) at low shaft speeds,

oil flows mostly through the shaft jet bleed (lower dotted arrow). At high shaft speeds, oil flows mostly through the compression ports in the piston (upper dotted arrow). At intermediate shaft speeds, the oil flow can also be regulated by the compression valve in the DFV. During sudden shaft accelerations, oil can also escape through the compression ports in the DFV, further increasing comfort and handling.
In rebound flow (Figure 2)

at low shaft speeds, oil flows mostly through the shaft jet bleed (lower dotted arrow). At high shaft speeds, oil flows mostly through the rebound ports in the piston (upper dotted arrow). At intermediate shaft speeds, the oil flow can also be regulated by the rebound valve in the DFV. During sudden shaft accelerations, oil can also escape through the rebound ports in the DFV, maintaining tyre contact with the road.

Because the DFV opens more quickly and easily on minor road imperfections, ride comfort is surprisingly supple and more akin to an OE suspension than an aftermarket coilover set-up. As a matter of fact, a DFV suspension can many times increase comfort over the OE suspension, while at the same time providing the handling, traction, response, and confidence needed for track driving. Over undulating surfaces, the compliancy of the R&T units allows the car to crest bumps and potholes, while remaining stable and in control. Traction is always maintained at its optimal level.

BENEFITS OF DFV

Thermal Expansion
Dampers will get hot—that’s one thing that you can be sure of.
As the piston moves within the damper, all the damping work is transformed into heat. Although we can’t stop heat, we can deal with it.
As the heat increases, the viscosity of the damper fluid is decreased, lowering the damping forces, which alters the car’s handling characteristics.
Our unique needle bleed valve system expands with temperature, closing the orifice that the fluid travels through, maintaining a consistent damping rate.

Balanced damping characteristics of rebound and compression damping

Improved handling and reduced body roll

Enhanced grip and traction

Versatile technology combines comfort and agility in a single unit

Highly responsive to both major and minor road imperfections

Maintains consistent damping under heat and friction

Enables precise adjustments with a simple setup

Sample of a R&T Kit (MINI Cooper S F56 )

 

 

Ohlin’s TTX (Twin Tube Advanced)

The TTX technology is based on the principle of creating damping force by raising oil pressure on one side of the piston and having gas pressure on the other side.  Single-tube dampers often see a reduction in pressure on one side of the piston. By never reducing oil pressure below gas pressure, cavitation can be avoided. Cavitation is a phenomenon that occurs when the pressure drops in the damper and gas bubbles form in the oil. This severely impairs damper performance. Using a TTX damper, a driver/rider will notice this as the damper unit delivers unrivaled control and flawless damping, no matter the conditions.

The TTX technology also makes it possible to regulate the oil flow through the compression and rebound valves separately, meaning that rebound and compression damping are adjusted individually. On most single-tube dampers, the “rebound” adjuster also affects compression. Thousands and thousands of engineering hours have been invested in perfecting their twin tube design to deliver the best dynamic damping behavior possible.

With a TTX damper you will never experience a loss of damping performance when pushing your vehicle to the limits, no matter the terrain or track/road conditions. Its consistent performance keeps the driver/rider safe and provides improved traction, control, and confidence. The TTX’s positive pressure buildup technology also keeps the damper’s dynamic behavior constant over the full adjustment range, meaning that you can use the adjusters’ full adjustment range without any loss in damper response or performance.

For all products fitted with TTX damping technology, there is a race-proven setting bank available to further tune the damper to suit any specific driver/rider, vehicle, or driving/riding style. With the TTX technology you receive the highest level of suspension technology, a real racing product. You find the TTX technology in a variety of dimensions, lengths, and designs, all tested by our qualified test drivers and riders. With the individual adjusters for the compression and rebound valves you have the best possible option setting up your vehicle to achieve the ultimate handling, comfort, and confidence, regardless of if it’s for a race or that Sunday drive/ride.
Twin-tube technology provides the possibility and is designed to control the two-way oil flow through the piston and through double tubes. It makes it possible tune the oil when it is passing the compression and rebound valves separately and by that control the pressure on each side of the piston. A rider will notice this as the damper unit delivers unrivaled control and flawless damping, no matter the conditions.

Benefits Of TTX

Eliminates the risk of cavitation and guarantees uniform damping under all conditions

Huge adjustment range

Damper dynamics and response stays constant over full adjustment range

4-way adjustable versions also available: low-speed compression, high-speed compression, low-speed rebound, high-speed rebound

 

Sample TTX Kit (Porsche 992 GT3)

Have questions?  Talk to us. We are an authorized Ohlin’s dealer, and match prices.