If you are familiar with the name Boost District that chances are good you know who Roshan Poptani is and you’ve seen his 2015 Chevrolet SS sedan. Roshan is the President and owner of Boost District, and he started his business with this car almost a decade ago. If you are not familiar with anything I just mentioned, then prepare to be impressed by a four-door family sedan capable of single-digit quarter mile times while remaining tame enough to haul the family on long road trips. Roshan’s SS has been through several iterations, and the latest is a world’s first. He recently announced via the Boost District YouTube channel that his Chevy SS sedan is the first in the world to receive a 10-speed automatic transmission swap.
For this swap, Roshan sent the sedan to Powertrain Swap Solutions in Houston, Texas. GM offers two 10-speed automatics, the 10L80 and the 10L90. The 10L90 comes in the ZL1 Camaro, has two additional clutches as compared to the 10L80, and is rated to hold more torque than the 10L80. Considering Roshan’s SS makes over 1,200 wheel-horsepower, the additional torque rating of the 10L90 made it the better candidate to use in this transmission swap. Powertrain Swap Solutions rebuilt the transmission with a Raybestos kit along with a few other goodies to ensure it will hold up to all the power Roshan is going to throw at it.
We covered this beautiful SS sedan last year here on LSX Magazine. As a quick refresher, the car is powered by a 427 cubic-inch LS engine built by Koza Performance of Elgin, Illionois, using a DART billet crankshaft and Diamond pistons. They topped the LS off with Frankenstein Engine Dynamics M311 Boost Monster cylinder heads and Boost District’s Gen-II 2650 supercharger. Roshan upgraded the fuel system with 1700cc injectors from Injector Dynamics, a DeatschWerks surge tank with two Walbro 525 fuel pumps plus and additional Walbro 450 pump. The combination is controlled by a factory GM E38 ECU tuned in-house by Tim Haines.
As for the 10-speed conversion, it’s a relatively simple procedure with help from Powertrain Swap Solutions. Their swap kit includes a wire harness, an unlocked transmission control module (TCM), and the adapters to make this a plug-and-play installation. According to Roshan, the factory driveshaft is retained as well as the transmission crossmember, factory shifter and shift linkage. Additionally, the speedometer, cruise control,…
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