The factory 90hp TDI engines built between 1999-2003 in North America use a conventional Garrett GT15 turbocharger ( 90hp Vnt15 ) with an variable-geometry exhaust housing. These turbo's are designed for up to 15 psi sustained boost with peaks of 18psi under hard acelleration. Depending on your fueling performance upgrades, which require higher boost levels for improved performance, and lower EGT's, PDR recommends the Garrett variable-geometry 110hp VNT15 or the 150hp VNT17 turbochargers. These are factory Volkswagen turbochargers from the European 110HP and 150HP VW TDi diesel engines. These turbos are a upgrade are for the 90HP TDI engines and will not work for the newer 100HP PD diesel engines.
With the variable geometry turbo there is no waste gate. All of the engines exhaust gases pass through the turbine at all time. At low engine speeds a set of vanes inside the turbine housing move to direct the exhaust gases through the turbine at a shallow angle and higher speed. This causes the turbine to spool faster, reaching optimal boost levels sooner. As engine speed increases the vanes move toward a more open angle. This allows less energy to be transmitted to the turbine wheel so boost levels are controlled.
The VNT17 turbo from the 150HP European engine is designed for sustained boost levels of 22psi, and intended for any set-up that can push past a sustained 18psi. This turbo is the only choice for the more aggressive engine upgrades and those pushing the limits. PDR modifies the VNT17 to be a direct drop in for the 99-03 Jetta, Golf and Beetle. Customer will have to supply gaskets and bend factory small turbo bracket for install.
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