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Volkswagen Corrado
VR6 engine development
VR6 Engine build progress
Photos of machine work and assembly.
2/23, Motronic reprogramming
Check out this new page for info on how we're reprogramming the Bosch Motronic M2.9
2/10, New 2.9L Engine Construction Has Begun.
We sourced a seasoned block last month and also purchased a used head from a later VR6. The later heads have an improved alloy which is less prone to water jacket deterioration. The cylinder head and block will undergo a thorough hot tank cleaning, inspection and component magnafluxing. Afterwards the engine will be machined for the larger pistons and to achieve the allowed increase in compression ratio. All rotating and reciprocating components will be balanced and all tolerances will be carefully machined to bring everything into exact specification with factory limits and the rules. A process commonly referred to as "blue printing".
Finally, the engine will be carefully assembled with the highest quality OEM parts available from Bildon Motorsport.
We expect that installation into the race car and dyno testing of the new engine will begin in March.
VR6 dyno videos
5/06, Bumping the limiter ECU tuning with the 2.9L (3 MB)
12/04, Video of initial baseline dyno test of the VR6 engine. (4.6 MB)
VR6 dyno graphs
12/04, Initial runs. 155 Wheel horsepower (178hp corrected) on a Mustang® load bearing dyno. We're aiming for 170 WHP in order to keep pace with the 325is BMWs which are putting 195 WHP to the ground! The Corrado is fortunately 170 lbs. less.
VR6 Engine Development Notes
One of the more interesting SCCA rules changes lately has been the allowance to modify the ECUs. The rules now state that you can do anything as long as it is done within the stock ECU case and using the OEM harness and connectors. This has lead some teams to put fully programmable MoteC racing ECUs inside their cases and then rewiring it to the OEM connectors.
Our plans are a bit more conservative and much less costly. We'll be using the Perfect Power SMT6 "Piggy-back" system to alter fuel, timing and ignition signals during engine development. Once we've locked in the parameters that are producing maximum power we will be programming our own chips.
The Bosch Motronic will be hacked to run on a single map instead of the usual idle, part, full throttle. We'll implement custom VAG-Com blocks, remove the checksums and increase the map's resolution. In the end we plan to have a full race ECU that is implemented via the original Motronic 2.9 system hardware.
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