I'm working on my second HotRod project. My first is what led me here for a question.
My first project was and still is a 2016 Juke Nismo RS. Stock, this car has 168 ft-lbs of torque delivered from a 1.6L factory turbo engine. I had it tuned (cold air intake, all new fatter connection tubing, new intercooler, new downpipe, blowback valve and UPRev tune). The result was a Dyno value of 209 ft-lbs "at the wheel", which is equal to roughly 245 ft-lbs at the engine (Juke is a CVT vehicle and 18% is a ballpark figure for loss to the wheel). So, this summary tells us that my tune, of an existing turbo engine, increased torque by ~50%.
My next project is adding a Supercharger to a 2.0L conventional engine which is rated to have 143 ft-lbs of torque.
What net increase can I expect from this Supercharger upgrade?
I know KIA has a 2.0L turbo (non-supercharger) out there that delivers 260 ft-lbs of torque. So does Land Rover. Even if my net increase for my project was 100% (143 --> 286), I'm surprised by that figure. Either the guy who tuned my Juke was a wizard, or what I'm finding is that if I increase the displacement of my engine by 25% (1.6 --> 2.0) and if my Supercharger gives me a 100% improvement, I only get less than 20% torque improvement over the smaller engine. (1.6L = 245 ft-lbs vs. 2.0L = 286 ft-lbs).
Can anyone out there help explain these figures to me?
And, can anyone give me their real world experience of what torque increase they got when they added their supercharger?
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