Boosting our 2008 Shelby GT500 project with VMP Tuningâ€™s Gen2 TVS supercharger case upgrade
By Steve Turner
Being at the forefront of Ford performance is a blast. We love being on the front lines as new cars and products come into the world. Watching the progression of vehicles and aftermarket gear is always exciting. Of course, the downside is that we can often get jealous. Itâ€™s only human to fall for some of these cool cars and products, but thereâ€™s only so much room in the garage.
That was definitely the situation when we first covered VMP Tuningâ€™s new Gen2 2.3-liter TVS supercharger upgrade for 2007-2014 Shelby GT500s and 2011-and-up Mustang GTs. If you followed our coverage of testing this supercharger versus both a standard TVS and the upgraded Trinity TVS found on 2013-2014 GT500s, you know this new supercharger works well.
It was cool seeing the new blower in action, but then we looked under the hood of Project Vapor Trail, our 2008 Shelby GT500 project car, and the Gen1 TVS was starting to look a bit outdated. Fortunately for us, Justin Starkey, the main man at VMP, decided to offer a Gen2 case upgrade (PN GEN2SWAP; $1,499.00) for those of us already rocking a 2.3-liter TVS.
â€œWith our Gen2 case swap the same airflow benefits you would realize from a VMP Gen2 TVS are available to those running older style TVS blowers,â€ Justin explained. â€œDo you get to have your cake and eat it too? Mostly, but purchasing the whole blower from VMP gets you a one-year warranty and nose drive machining that allows for smaller pulleys. Either way, the rotor set is the same, the magic of the Gen2 case is in airflow potential of the housing.â€
So when we could both clear a moment in our busy schedules, yours truly made a date to head over to VMP Tuning to document the case swap and its benefits. If you read our prior stories on the Gen2 TVS, you know that this new case not only features a much larger inlet, but numerous internal improvements designed to feed the TVS rotors with as little restriction as possible. If you know anything about positive-displacement superchargers, you know they abhor inlet restrictions, so on look at the Gen2 and you know it is going to make power.
If you are thinking that swapping the rotors into a new case might be too daunting, we are here to tell you it is not that difficult a swap at all. It just requires some basic tools and some attention to detail. It really only adds a few more steps to a straight supercharger swap, and the extra work is well worth the effort.
Those who arenâ€™t familiar with Project Vapor Trail, it runs a pretty basic combo. Underneath the Gen1 TVS, VMP throttle body, VMP 2.5-inch pulley, and JLT Performance Big Air CAI is a stock engine fitted with a 10-percent-overdriven lower damper and exhaling through a Bassani 3-inch exhaust. Coming into this test the car ran the stock fuel pumps and set of Ford Racing 80 lb/hr injectors. It is a pretty mild combo that typically put down rear-wheel horsepower in the upper 600 range on pump gas and low-700 range on 100-octane unleaded.
â€œThe gains were what we would expect at this boost level, Steveâ€™s TVS was working hard with a 10-percent-overdriven lower and 2.5-inch upper pulley,â€ Justin said. â€œNow, with the Gen2 housing, it can finally breathe, realizing great gains in horsepower and torque. The larger displacement â€™13-â€™14 5.8-liter GT500s will benefit from the Gen2 case as well.â€
As you will see, by swapping PVTâ€™s existing 2.3-liter TVS rotors into the Gen2 case, adding a new custom tune from Justin Starkey, and adding a bit more fuel via VMPâ€™s plug-and-play fuel pump voltage boosters put this GT500â€™s pump gas output into the range that used to require 100-octane fuel. Consider our TVS envy resolved!