Steve Serifini, owner of Fab-U-This in Torrington, Connecticut, has been fabricating custom headers, exhaust and award-winning builds with some of the most intricate and beautiful weld work in the industry for the past 25 years, 15 of which at Fab-U-This. The two have worked together through their love of motorcycles, originally working on Hass’s GSXR 1000. “He [Steve] does the fab work on my 1000cc and I decided to build something different and no one has seen before,” Hass confirms. “I want to make more power. The original plan was to do it as a 1000.”
Hass continues, “I started buying parts and the turbos; I had a 1000 chassis. Everything started going together. I started thinking about the engine cases cause at the time I was doing this, I started making big boost and having problems with the 1000 engine cases. And if I’m having problems with this turbo, [our new] setup is going to blow it apart.”
The new setup—based around a 2004 Suzuki Hayabusa chassis with the neck raked five degrees—is a solution taken from Hass’s experience as a heavy equipment and diesel mechanic, where one night browsing on the internet he stumbled on a compound turbo setup from one of the diesel forums. Serafini remembers the exchange, “Don sent me a picture of a compound turbo setup, because it’s big on the diesels and you can run a ton of boost with very little lag; it comes on quick.” The consensus was decided that it would be a “fun thing to try” so after tossing the concept around, Hass left building the world’s first compound turbo motorcycle—and potentially the first to 300 mph in one mile—to Serafini.
“It was one of those things that if we counted the man hours, it would probably disgust me."
“I told Steve, this is the concept I want, I think we should put the turbos here and I’m leaving the build up to you,” Hass says. “Build it as you want to build it.”
Compound turbos are a great solution because of the power delivery and high boost numbers. In this case, Hass-Serafini is projecting around 60-70 psi on an alcohol setup. In order to compensate for the temps and extra boost, Serafini built a custom 5-gallon ice tank to hold (you guessed it) ice water that circulates through the liquid-cooled intercooler. Even during hot and humid days on the dyno, they were seeing frigid temps and impressive numbers: 564 horsepower @18psi.