Another fabulous conversion on an Astra H VXR.
This car first came to us for mapping to Stage 3 (hardware requirements are a full 3″ exhaust system and uprated intercooler). The car was fitted with a Forge lower front mount intercooler, but on the exhaust side only had a pre-cat removal pipe, and a Piper 3″ cat back exhaust system and was still running the factory main cat section. Obviously with this restriction in place it would be down on expected power, and upon checking on the rolling road this was found to be the case, but still making a respectable 283bhp.
Remedial action was simple; fit a 3″ front pipe and sports cat section. Once the mapping was finalised the results were a very good 299.99bhp and 332 lb ft torque on a cold January day.
In the hunt for more power, the car returned to us recently for a full K06 and inlet manifold upgrade.
ZRP steel rods and uprated ARP rod bolts were fitted, stem seals and retainers were done at the same time, and then when being put back together the K06 turbocharger, Courtenay Turbosmart uprated actuator, Courtenay Klasen high flow inlert manifold,thermal inlet gasket and high flow 340 fuel pump were all fitted. This was also the ideal opportunity to replace the cambelt and water pump and fit a lightweight allow bottom pulley.
Z20LEH engine being fitted with steel rods
An uprated CSRacing clutch kit and lightweight billet steel flywheel were also fitted, as a safeguard against the increase in power and torque, and to top it off a huge K Sport 8 Pot 356mm brake kit was also fitted, to bring everything safely to a halt. The car already had a Wavetrac LSD in the gearbox.
Rolling Road Mapping
The end results after mapping 333bhp and 350 lb ft torque.