2 Attachment(s)
New non zero roll suspension
BRD Motorsports DRRS Suspension
for FV, FST, and Challenge Cup Cars
Tired of tuning your Formula Vee or Formula FST with incremental suspension changes and swapping out front ARBs? Greater performance can be achieved by adding or subtracting roll stiffness in the front and rear of the car. That’s where Dynamic Rear Roll Stiffness (DRRS) comes into play. With DRRS you can do so much more. You can achieve vehicle balance easier with quad adjustable dampers to make a real difference in the car’s overall performance. The kind of changes the driver can feel!
https://www.apexspeed.com/forums/att...d=106332&stc=1https://www.apexspeed.com/forums/att...d=106333&stc=1
BRD Motorsports Project Goals
- Design a suspension system to create a fully independent rear suspension with adjustable droop limiter
- Provide for dynamic rear roll stiffness adjustment via quad adjustable Ohlins dampers
- Create a suspension design that reduces the likelihood of damaging the dampers. They are safer mounted on top of the transmission, rather than under the transmission like some other designs.
2022 Performance Outcomes
DRRS was tested and competed in select FRP races during the 2022 season. Some of the results were:
- Pole position at Pittsburgh (0.80 seconds ahead of second place)
- Lap record pace at Pittsburgh
- Race win at Mid-Ohio (20 seconds ahead of second place)
System Advantages
Some advantages of using the DRRS suspension system include:
- Easy damper adjustments without removing body work
- Rain race damper adjustments are quick and easy
- Starter can be removed without any effect on the suspension
- Simple push rod adjustments for ride height and camber
- Simple droop limiter adjustments with rod ends on droop cable
- Easy installation of the system, no welding or fabrication needed
KITS AVAILABLE NOW
DRRS Kit Pricing
Complete kit materials include all fasteners, rod ends, push rods, and spacers to install the assembly. No welding or fabrication required. All fabricated parts are black powder coated and have stainless steel fittings. Technical support and baseline settings along with comprehensive instructions are included with each kit.
Complete Kit (less dampers): $2,750
Ohlins quad adjustable dampers and springs: $1,400
Engineering Consultation Available
DRRS development engineering consulting (at track): $60 per hour
General race engineering consulting (at track): $100 per hour
Call for more information
Brad Buenting
BRD Motorsports LLC
734-626-2277
Damper to wheel motion ratio.
Hi Steve,
the motion ratio is progressive, just under 1:.20 to 1:30
we found out that getting a favorable motion ratio,
allows for good dynamic damper tuning
cheer, Brad
Other forums might merit a look
I'm a member of a larger forum than this one which has a bunch of commandments. If a user is just too abrasive and violates the rules they get points against their continued stay. When they accumulate too many points they get kicked off the forum. Something to think about.
Thank you rgu, as ApexSpeed develops we will continue to communicate and increasingly encode the respectful and passionate community norms and expectations that have been developed here to keep us helping each other and humming along. Mods and admins are always available via PM / search and are happy to help with deconflicting or clarity on acceptable use and behavior. - ApexSpeed
Production Units have Arrived
BRD has now taken delivery of the production DRRS units and there have been worthwhile changes that we would like to inform you of.
First all the production cradles have been modified to move the dampers and droop limiter lower which should solve most clearance issues although some tailpipes may require modification to clear. We have arranged for an exhaust builder to modify your system. Send pictures of what you have so we can get you a quote.
Second we are able to lower the price of the mechanical parts kit down to $2,000 (dampers are still $1,500) because we are past the prototype stage and are now in production.
Third at track development and tuning are free to customers when BRD is at the race weekend. Otherwise appointments can be made to work over Zoom.
Just a reminder we are bringing a complete kit to (PIR birthday info?) for display and will be available for sale at the end of the weekend.