Episode #8: Completion and testing
Jay Leno’s Tank Car is just one of several high profile development programs ongoing in the Banks Advanced Prototype Engineering labs.
Part Eight in a Series: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8
Only a few little things remain to be completed before we can light this thing off. Only a few little things remain to be completed before we can light this thing off. We hooked up vacuum lines for the power brakes, reworked the crankcase ventilation system, and did some slight trimming of the body panels around the new turbo components. The short wastegate outlet pipes were abandoned later for pipes that tied into the main exhaust; too much flame came back at the driver during dyno testing! CARandDRIVER.com (August ’06) described the Tank Car’s engine as looking like “a small oil refinery.”
This is how the wastegate exhaust was routed after dyno testing. A bellows and v-band joint was added so the wastegate outlet could enter the main pipe downstream of the turbo. All exhaust tubing was left “natural” so the heat could color the stainless into gold and brown hues.
After we machined a pair of v-band adapters for the turbine outlets, fabricator Daniel Dominguez built the 4-inch diameter, 10-foot long exhaust pipes that run along the body. “We don’t need no stinkin’ mufflers!” The turbochargers and pipes quiet the exhaust note just enough so the racket becomes a roar.
A custom air filter and adapter was designed and built to mount on the front of the turbo compressor. The filter has an 8-inch diameter neck to provide the air plenty of diffusion before entering a bell-mouth section at the compressor inlet. Here the filter has been removed to show the bell-mouth and the crankcase vent port at the bottom of the adapter flange.
We’re ready for fire-up! Christoph Lehmann flew out from Bosch to set up the engine management program and help with initial calibration. After setting the fuel pressure, changing all 24 sparkplugs (2 per cylinder) and adjusting the crank position sensor gap, the big monster roared to life. When Christoph finished the initial calibrations, we drove the Tank Car up the block to the Banks chassis dyno for road-load mapping and testing.