We were recently chosen by a long-standing customer to undertake the recommissioning of his Gp.A Sierra RS500.

The car was originally built by Andy Rouse Engineering in 1988 and was driven in the iconic Kaliber livery by Andy himself to first place in 10 of the 11 scoring rounds of the BTCC that year, making it the most successful RS500 Andy drove (and arguably ever built).

The car was then sold to legendary Australian touring car driver Peter Brock where it was transformed into the Mobil livery that remains on the car today. Brocky drove the car himself throughout the 1989 ATCC, with it also being shared with Andrew Miedecke and Brad Jones for the 1989 endurance events. Brocky drove the car for the last time at the 1990 season finale Adelaide GP support race before it was stored for many years and subsequently sold.

Critically, this car retains its original Andy Rouse Engineering engine that was fitted to it in period, making it one of the very few Gp.A RS500s around today having its original engine fitted.


The work undertaken by us involved a full workshop assessment, defect rectification and setup, followed by live ECU calibration on our Dyno Dynamics rolling road.

The car will not be raced, so the target was not the in-period 560+bhp, but to achieve good power whilst running sensible boost to preserve this historic engine and maximise usability and reliability…


Pictures of this amazing piece of motorsport history will follow in the comments.