Most of our cars are limited by ETs.
Time and time again this argument comes up about turbo systems being more efficient than supercharger. Or, this supercharger is more efficient than that supercharger. These arguments are general in nature and do not answer the question about what setup to go with when selecting a power adder. It seems that the argument is always started by saying that one system is better than another; then trying to get that system to meet ones goals. You do not select a power adder then try to make it meet your goals; you write down your goals and select a power adder that will achieve them.
Before embarking on this discussion some questions have to be answered:
How do you plan on using your mustang (drag car, track car, street car, or a combo of the choices)?
What kind of budget is available?
Is your warranty a concern?
How fast do I want your car to go (ETs)?
What other modifications are needed with a power adder that will achieve that goal?
How easy will it be to install?
Establishing goals, researching options and creating a defined budget will lead to results that will meet your expectations.
Here is how I decided on my power adder.
I anticipated on using my car as a daily driver when the weather is nice and race on the weekends (I have two ¼ mile tracks within 40 minutes of my house).
The first thing I asked myself was “what is my budget?” If I have a budget of $1500, my options are limited to simple modifications: CAI and a tune or Nitrous. If I have a budget of $7000, I have a lot of options available to me. My budget was $7000.
My warranty is somewhat of a concern but I have a good dealership that will work with me when it comes to those issues. Overall, my warranty did not prevent me from making the upgrade decision.
The next thing I have to decide on is what kind of times I want to run. I decided on ETs no faster than 11.5 for the quarter mile. Any faster than 11.5 and more modifications are required on the car: padded roll cage, bellhousing (SFI 6-1/6-2), drive shaft loop, Flywheel/Clutch (SFI 1-1/1-2), Protective Clothing, and other requirements may need to be met.
I decided that I would upgrade the clutch ($300), driveline ($600), and add a driveline loop ($150).
Deciding on a power adder.
I wanted something that was nice to look at, easy to install, and give me a feel of power at all RPMs. This is why I decided on a twin-screw supercharger w/intercooler (
Whipple, $6000). This system looks nice under the hood, is easy to install, and with a good tune should run into the 11’s. My dealership is also supporting me with this system. One bad thing is I need to replace my Ford Racing strut brace or modify it to fit with the new S/C.
I did almost get a centrifugal style supercharger. However, I decided against it because I wanted the low end HP and I am getting support from my dealer on the other system. I also like the look of the other system better. One plus for this system is that I could have kept my Ford Racing strut brace.
Although a turbo will create great high end power and has no draw on the crank, it does create additional backpressure in the exhaust, under hood heat (under hood style turbo), and rerouting of exhaust in a tight engine compartment is required. These systems are very flexible and easy to adjust/increase boost. If I was building an all-out race car, I would strongly consider a twin turbo setup.
Also, superchargers are more popular than turbos because there are more options and support for superchargers. Turbos require more mods during install.
Anyway, my point is arguing for one system over another because of efficiency is pointless. Most of us here drive our cars on the street and will not be making a car that will run faster than 11.5 ET anyway.
Good luck on your endless journey of mods!
