Turbo Lag: VG vs Wastegated

In this clip from our Killing a Duramax series, Gale Banks and the team upgraded the stock L5P variable geometry to a larger waste-gated system from Precision. While larger turbos do take longer to spin up, the test we devised showed us exactly how much. The test also showed how much a VG turbo smoothes out the curve in turbo RPM.