Performance Options

The unassembled Birkin kit is essentially a rolling chassis, consisting of all new parts. It includes the chassis, complete front and rear suspension, dash, seats, top, side curtains, tonneau cover, windscreen and wipers, fenders, nose, bonnet, mirrors, lights, wiring loom, fuse box, wind wings, brake system except front calipers, fuel tank. These items come directly from the Birkin factory.

The kit does not include Engine, transmission,wheels and tires, front brake calipers, shock absorbers, rear diferential, instruments, floor mats or shipping. Items not included in the rolling chassis are acquired in the U.S. at favorable prices
 

Our primary recommendations are the Stock Ratio 5-speed T-9, the Close Ratio T-9, and Quaif Sequential Shift 5 or 6 speed transmissions. Other options are available.

The Haltech Platinum 1000 is our preferred computer. It has been developed and enhanced specifically for Birkin cars. It will function correctly with the direct fire, 4-coil ignition system used in Duratec engines, and uses engine vacuum for refined tuning. It will power many upgrades which might be chosen in the future. This is a sophisticated "plug and play" system that is easy to install and allows the owner to modify the map, using a PC, to perform functions such as managing superchargers, launch controls, and other applications. You can find out more by going to Haltech

Other good engine management systems are also available at a lower cost, without sacrificing significant performance.  

We primarily use two wheels:

The Panasport Mini Lite is a traditional wheel, retro in style, that is enjoyed by many in the Seven community. Most cars use 15 inch wheels. With Panasport we use one spec front and back: 37 mm positive offset. 

Enkei also makes very good wheels with a unique look and high performance. They weigh 9.5 lbs and, like the Panasports, can be used on or off the track. With Enkei we use 35 mm positive offset in front, and 41 mm positive offset in the rear. 

Tires:

There are many good high performance tires available; however, we have had good success with BF Goodrich G-Force Sport RBL. These BFG tires are sticky and designed for high speed driving, yet they are completely legal for street driving. Birkins are so light that this sticky tire will still provide decent longevity.

If you use Panasport wheels, the recommended sizes are 195/50/15 or 205/50/15. Use the same size front and rear.  For Enkei wheels, we use two different offsets: 195/50/15 82V on the front and 225/50/15 91V on the rear.