Quote:
Originally Posted by vtknight
Having the C7Z - I can tell you it underperformed stock. Many/most have been running 125-128 MPH depending on DA stock at the track. There is enormous downforce (Cd) for sure - but there are other issues with the first gen direct injection as well as stock Tune from GM. The CTSV has always been slower.
Heat soak is a major issue with the Uber tiny blower (1.74L).
I had to move to a Procharger to get away from all of these issues and to finally make some power and performance with the car.
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GM was able to meet their power goals with the smaller supercharger. For sure it is not as friendly to the modded crowd as it becomes inefficient at higher boost, however the smaller supercharger uses less power to spin and builds boost faster. Many enthusiasts such as yourself , and those that buy this type of car, are ultimately concerned less with efficiency and fuel economy as much as they are about performance, so they will not mind going to an aftermarket supercharger. However, unless serious rubber is used, much of the extra power at low to medium speeds goes up in smoke....