About Safety - Please Read

Whether you are considering the purchase of a Birkin or are already an owner, we wish you many years of enjoyment with your car!
Birkins are powerful cars. The following points will ensure safe, comfortable and fun operation.  Some of these points should become your “pre-flight checklist” -  things that should be inspected regularly for trouble-free motoring. Others will improve your performance and handling.

1.  Check all fasteners on a regular basis.  These cars are by design performance cars and they will give you a lot of feedback while driving.  Much of this feedback makes it possible to drive the car more quickly than if you were somehow insulated from the road as with most street cars.  This feedback gives you a FEEL for what is going on, with the suspension system for example. 
However, because of the increased vibration, the fasteners tend to loosen much more quickly than on normal street cars.  Depending upon your miles of driving and other factors, we recommend that you go over ALL fasteners when you receive the car to make certain they are secured.  We recommend checking fasteners every 60 days, but if you drive a lot, do it more often!  A check should also be done before each and every track event.  This process will also familiarize you with the car, and over time you will learn which ones need to be checked a bit more often.  Many torque values are in the manual from the factory.  You might also want to torque the fasteners and then mark them so that a visual inspection will alert you to any loosening.  When you find something loose, secure it!

2.  Watch your clearance. The engine/bellhousing is the lowest point on this car.  Therefore we need to be careful on some roads how fast we go and avoid safety buttons and bumps on the road that could damage the car.  Additionally, most cars have a pan guard installed. This reduces ground clearance, but also provides some protection against damage. The suspension can be adjusted as to ride height; however, the alignment must be adjusted when changes are made.  After 500 miles it is best to have the alignment checked as a matter of course.

3.  The front brake pads will rattle a bit on the street. The front brake pads in the 4-pot Outlaw calipers are designed for racecars and are relatively loose in the caliper. This is designed to prevent drag on the wheels in competition.  The brake pad rattle is not a safety issue.  Outlaw tells us that they are working on some type of shim to reduce this noise.  Some cars we build have Wilwood Calipers, which do not make this noise.

4.  The ride height should be approximately 294 mm between the shock eyes in front.  This is to prevent the shocks from reaching their end of travel upon full compression.  If this was to happen, damage could result to the lower wishbones.

5.  Inspect and tighten your suspension bolts often. The IRS rear suspension has axles to each wheel.  At the end of the axle nearest the differential there are bolts that secure the axle to the differential.  We have had cases where these bolts loosen up in short periods of time on the road.  We are in the process of changing fasteners in many cars.  If yours has not been upgraded, please contact us and we will send the new 12.9-hardness bolts.  Please secure these bolts liberally with red locktite as well.  This is very important to prevent damage and potentially unsafe conditions.  Some cars came with the correct fasteners and others did not.  Please check yours at this time and let us know your needs along with which differential brand is in your car.  The fasteners are slightly different on the Subaru versus the Sierra differentials.

6.  A note about suspension height and comfort. With respect to the suspension height settings, the ride quality and handling of the car is impacted by the ride height settings via the four shocks.  As a starting point we recommend setting the hardness valve should to the full counter-clockwise position for soft settings.  This results in a supple ride. For competition you may want to experiment with stiffer settings of the shocks.  The ride height in the rear should be measured at the bottom frame rail, just in front of the rear wheels.  The ride height from the ground should be approximately 5.5 inches with 15" wheels.  After driving the car for extended periods of time you may wish to make some changes to meet your needs.

We will be happy to assist with your questions anytime.  Performing these checks should become part of your normal routine, providing not only safety and comfort, but also familiarization and “bonding” with your car.