Project 240SX Land Speed Racer: Better Living through Volumetric Efficiency
“A big ass turbo with an engine strapped to it.” From under the hood, that's how Project 240SX LSR is best described. When it comes down to it, our SR15VET 20V engine and all of its ancillary components exist for the sole purpose of propelling our turbo so that it can make boost. By packing as many air molecules into our 1.5 liter engine as possible, volumetric efficiency increases which ultimately equals more power. With drag increasing exponentially with speed, more power is exactly what we need to go faster.
Up until this point, we've only discussed the build of our SR15VET engine by 5523 Motorsports in San Diego, California. During that build, we boosted volumetric efficiency through the assembly of a high compression, long rod bottom end and a fully ported 20V head. All great mods, but in this game forced induction is the MVP.
At the center of Project 240SX LSR's turbocharged universe, is a massive Borg Warner EFR 8374 turbo. We chose a Borg Warner EFR series turbo because it is far from the common repurposed diesel truck turbo; and instead, is specifically “Engineered For Racing.” (Hence the acronym E.F.R.) If there's any doubt to that statement remaining in your head, check out an Indy Racing League engine for the last bit of reassurance that you'll need. What you'll find hung off the end of an IRL engine's manifold will be either a single EFR 9158 or a pair of EFR 6758 turbos. Enough said.
When looking at a Borg Warner EFR turbo one can almost see a technology rich aura radiating off of it, but what specifically makes the EFR series so good? What it really comes down to is the all-inclusive packaging and technologically advanced features of Borg Warner's EFR turbos.
On our EFR 8374 turbo, the all inclusive packaging starts with the incorporation of a boost control solenoid, speed sensor port for collecting impeller wheel speed data, and an integrated compressor bypass valve. 
