Swap Insanity: The First Turbo LS3 Powered Three-Wheeled Slingshot

With any engine, we’re confident that a Polaris Slingshot is a pretty good thrill ride. And with only 1,750 pounds to move around, you can bet its power-to-weight ratio is well in favor of anyone looking to go fast. Once used in the now-defunct Pontiac Solstice/Saturn Sky, the Slingshot’s GM 2.4-liter DOHC Ecotec inline-four is standard and its naturally-aspirated output is a fairly respectable 173 horsepower.

But if 2.4 liters is good, then wouldn’t 6.2 be better? Like a lot better? And throw in a little hairdryer boost to go with it? Yeah, we thought so. It would be way better.

The LS3 is a tight fit in a Slingshot, but the techs at AP made it work.

With that in mind, enter Alpha Powersport, a bunch of guys at a company in Houlton, Wisconsin that might be eating a little too much cheese for their own good. In all seriousness, though, we’re mighty impressed that they were able to shoehorn a Chevrolet Performance Parts LS3 crate engine between the front wheels of a Slingshot, then add a turbocharger to the mix for a nice added feature.

Alpha Powersports co-owner Andy Roseau explained, “We had been working on this project for a while now and we are excited to have completed it.” Needless to say, we are also excited it has been completed.

Dubbed the Monster 62RR (6.2 liters, race ready) here are its particulars: A standard-issue Chevrolet Performance Parts LS3 crate engine (the most basic of the four LS3 variants available from Chevrolet Performance) produces 430 horsepower. AP added a Precision Turbo, billet ball-bearing 76mm turbocharger, which is part of an AP custom turbo kit, to bring output up to about 750 horsepower. Other supporting pieces here include dual Precision Turbo 46mm wastegates and a PT 60mm blow-off valve.

The Slingshot’s standard five-speed manual is replaced with a Chevrolet Performance 4L65-E automatic to handle the output of the turbo LS3. There is also an AP automatic-shifter system to control the four-speed automatic.

There are all kinds of cool details on the AP turbo LS3-powered Slingshot.

Other pieces in the supporting cast to make this Frankenstein-esque conversion work include, AP custom-fabbed V-8 motor mounts, a pair of AP custom turbo-system exhaust manifolds, an AP 5-inch thick radiator, and an AP front-mounted intercooler. AP also built and utilized billet alternator-relocation bracket and relocated the upgraded radiator.

You can’t do just the engine stuff and skip everything else on a deal like this, so AP didn’t skimp on the underpinnings either. The company added bigger brakes up front with six-piston calipers and 13.8-inch rotors, JRi shocks, and a hydraulic adjustable ride-height suspension.

 

A custom-molded hood and a rear carbon-fiber spoiler, painted with a base coat/clear coat finish by Steve Collision completes the look of the turbo-LS Slingshot.

“It is exciting to see our team bring this project to life, said Henry Chan, the other co-owner of Alpha Powersport. Our goal is to provide the highest level of quality in everything we create. Our guys pride themselves on their fabrication ability and integrity throughout every aspect of the business and we are proud to show that in this otherworldly-performing Slingshot.”

We also spent a few minutes speaking with Toua Yang who is AP’s Director of Media Relations and he told us that, “orders are coming in on the LS Slingshots, with a few coming from Dubai. There are also two more Slingshots in the shop with naturally-aspirated LS engines, so if a customer wants to have a non-turbocharged version that is also possible.” We’ll take ours with an all-motor LS7, thank you.

About the author

Miles Cook

Miles Cook began his automotive writing career at SEMA, then spent a year at Turbo & Hi-Tech Performance covering the ’90s import scene. He then worked for Car Craft magazine, where he became the de-facto Ford guy on the staff. Next, he went to Mustang Monthly where all Mustangs were the mainstay. Miles is well versed in vintage and late model Mustangs as well as GM, Ford, and Mopar musclecars. His expansive background ensures that Miles is right at home writing for Power Automedia.
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