from the article
Augmenting the heart of the TRD X-Runner is a mid-sized Eaton M90 positive displacement supercharger, stuffed between the banks of the stock displacement V6. Internally, 9.2:1 compression custom CP pistons, Carrillo rods and minor machining to the stock crank are all that separate the 400bhp bottom from the stock 10.5:1 Tundra/Tacoma unit. Even the heads and gaskets are kept stock (with the exception of some minor port matching). TRD also custom-ground 214.5- and 212.5-degree duration intake and exhaust cams featuring more lift on the intake side and less on the exhaust. To accommodate this, the lower manifold beneath the supercharger was replaced with a unit that directly bolts to the blower and also features trumpets tuned for boosted flow.
Also thrown in is an 80mm throttle body from a big Toyota V8, a pair of tubular three-into-one headers (that still include high-flow close-coupled cats), a big beefy exhaust, and a top-fed panel intake filter breathing through the stock X-Runner hood scoop. Fuel and engine management are controlled through multiple custom Toyota ECUs, piggybacked to run the six 410cc/min injectors in the stock manifold bosses, two additional injectors (prior to the compressor), e-throttle, plus enough data acquisition, communications and signal processing channels to run a Mars Rover.
The big headache with any Roots-type blower is cooling. Mechanically compressing 400bhp-worth of air generates a lot of heat. Air-to-air intercooling is not practical, so TRD has deployed a massive liquid-to-air intercooler system with added pumps, lines, reservoirs, and a massive heat exchanger stuffed into the grille to help the system cope-which it does even under summer conditions at the track.
Read more:
http://www.modified.com/features/0612_sccp_trd_toyota_tacoma_x_runner/viewall.html#ixzz2TmaEMXn1Read more:
http://www.modified.com/features/0612_sccp_trd_toyota_tacoma_x_runner/viewall.html#ixzz2TmZYE6ZA
