I have been considering whether to go supercharged or Turbo, I’m familiar with both platforms just wondering which one is more usable in the slingshot. Thoughts?
For the sake of equal time and an opposing point of view to balance perceptions, I am also working on a version of Turbocharger and Supercharger Pros and Cons. I'll have it ready soon and notify you and...well, everyone!
In the short run, I can touch on a couple of basics.
We prefer turbocharging for two primary reasons: versatility of power options and efficiency. It's for these same reasons that turbocharging has almost completely supplanted supercharging in new OEM applications, as OEM engineers prize the same capabilities our engineers do. I'll elaborate a bit:
Turbocharging's extensively more adaptable and adjustable range of power levels offers the enthusiast many options, from upgrading to higher power levels later, to using the infinitely variable nature of turbocharging's boost levels to adapt power flow on the fly. With turbocharging, we can build a complete curve of power levels available on the same vehicle, whereas supercharging is limited to one fixed, pre-set power level which requires mechanical changes to alter.
In a turbocharged machine, we can not only enjoy multiple boost/power levels at the flick of a dash switch, we can also automate them to automatically reduce power at lower speeds so as to enhance traction in the quite traction-limited environment of the Slingshot. We can therefore completely manage power to suit available traciton, whcih improves with vehicle speed. Our history of world records and championships in such disciplines has empowered us greatly to authoritatively manage this aspect on Slingshot. Supercharging offers no such capability.
Further to the versatility of tubocharging, the Precision turbo we use is effective all the way out to 520 engine HP. Should one ever need to exceed that, numerous other Precision models exist that will bolt-in and go.
As the video helps illustrate, a nice side bonus for turbocharging is that compared to the centrifugal superchargers used on Slingshot, we develop more low and midrange torque with turbocharging. As this dyno comparison shows. Incidentally, this comparo uses published information from the companies illustrated, for true objectivity:
As opposed to a supercharger, which draws power from the crankshaft to drive the supercharger unit, turbocharging instead recovers otherwise-wasted exhaust heat energy. This is another reason it is preferred by today's OEM engineers, as it enables them to extract more from a gallon of gas. To this end, in order for a supercharger system to match a turbocharger's output, if both make the same power at the crank or wheels, the supercharged engine will actually be forced to create an additional 30HP just to drive the supercharger. Since that additional power required is consumed by the supercharger drive, it doesn't get to the wheels, but it is nonetheless still experienced by the engine.
Today's racing scene is absolutely dominated by turbochargers, for all of the above reasons. In order for superchargers to remain competitive in classes where turbochargers are allowed, numerous concessions must be made by the turbocharged machines, specific limitations incurred so they don't just run away with it and obsoletize the superchargers overnight.