Limited Slip Diff - Corsa SRI Race Car

The Corsa SRI race car is fitted with a Sachs Organic Clutch Kit (rated at 407 lb/ft) together with a lightened and balanced stock flywheel. The M32 gearbox is also fitted with uprated bearings. To ensure all of the 400bhp / 380ftlb is laid down on the road we are fitting a Quaife ATB (Automatic Torque Biasing (QDF25B) limited slip differential. Limited slip differentials (LSD) are the last connection between your gearbox and your driveshafts.
A LSD limits the difference in spin speed between the opposing driveshafts. In a standard open differential (standard on all Corsa's) there is no limit in the difference of axle speed between left and right hand sides.
In real world terms, on an open differential, if you turn your TCS off and dump the clutch the car will furiously spin the wheel with the least grip. (Usually the inside one.)
After fitting a Limited Slip Differential, the difference in torque bias is restricted mechanically. So, instead of transferring all the power to one wheel, the LSD limits the velocity difference between the driven wheels.

Britcar 24 Hour - Thorney Motorsport

Thorney Motorsport are actively involved in the Astra Z20 LEH engine conversion currently being undertaken on our Corsa SRI race car.
Thorney Motorsport recently took part in the Britcar 24 hour endurance race at Silverstone racing their highly successful BMW E92 GT.  Despite a major setback early in the 24 hours, when an input shaft sheered in half with the resulting shock shattering the clutch plates, the team managed a comendable 3^rd in class.
The full story of the trials and tribulations leading to their success can be viewed on the Thorney Motorsport website.

Corsa SRI race car - build update

Great progress has been made - we're at the stage where numerous bespoke brackets and mounts have to be fabricated to mount all of the various engine components. This is a time consuming task but essential if the resulting Astra VXR engine transplant is to look professional. We have decided that a full 3" stainless steel race exhaust system will be specified to fully capitalise on the 400+ bhp being pumped out by the stage 5 Astra VXR engine. We will probably utilise Scorpion Exhausts, the same Company that are producing exhausts for the Thorney Motorsport BTCC Insignia - so we know they are going to be of the highest quality and performance.