Friday, March 14, 2008

Stohr WF-1 D-Mod Sports Racer






Last spring at Miller I came across three really pretty sports racers. They are all made by Stohr and are model WF-1. Stohr is pronounced store.

The chassis is a combination of carbon fiber with steel tube front and rear clips to support the engine and suspensions. The Stohr is comparable with Indy and F-1 in that those cars are required that the driver be surrounded by a carbon fiber survival cell. The Stohr is the only DSR (D sports racer) with this type of technology.

The Stohr WF-1 comes with full ground effects underbody. The rear tunnels are integrated into the full carbon fiber floor, the front carbon fiber diffuser balances out the grip to match that of the rear. The rear wing is made also of carbon fiber and weighs less than 5 pound. The rear wing is adjustable in 1-degree increments.

The WF-1 uses any modern 4-cylinder motorcycle engine. The power is transmitted through a Quaife differential via lightened CV joints and hollow half shafts. A lightweight aluminum radiator and large oil cooler cool the engine.

The suspension was developed by Ohlins engineers and driver Mark Jaremko. The WF-1 uses centrer-lock ultra-light racing wheels and Ohlins ST44 double adjustable shocks. The tire size is 8X13 in front and 10X13 in the rear. The uprights are machined from aluminum billet that have extra sleeves installed for increased wheel bearing strength and rigidity. The wheels bearings are large in size to withstand the high downforce that the car generates.

Wilwood billet aluminum brake calipers come with custom brake rotors that are full floating on lightweight aluminum billet hats. Stohr has gone with this expensive brake system as it provided a firmer pedal and longer rotor life. Tilton master cylinders with cockpit adjustable brake bias control are also installed as standard equipment.

The WF-1 weighs 795 pounds and had a wheelbase of 97 inches with a front track of 56 inches and the rear track is 54 inches.







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