Follow along as we go though the removal of the factory unit and install a Vigilante torque converter into an '06 GTO owned by Bob Cook of Allen, Texas. In addition, a quality transmission cooler from Hayden and Amsoil's synthetic ATF will be added to ensure that the fluid in the transmission remains cool under the most demanding conditions. Labor will be put into the capable hands of Real Performance Motorsports (RPM) of Lewisville, Texas, and technician Manuel Bejar. Once installation is complete, it's off to the dragstrip to find out if the Vigilante converter can live up to its reputation as one of the best bang-for-your-buck performance modifications for late-model GM vehicles.
Drag Testing
Drag testing was conducted before and after the installation of the Vigilante torque converter on back-to-back weekends. Baseline testing of the stock torque converter was conducted at the Texas Motorplex in Ennis, Texas, a quarter-mile racing facility. Testing of the Vigilante torque converter had to be conducted at North Star Dragway in Denton, Texas, an eighth-mile racing venue.
Although both tracks are located within 60 miles of each other, NHRA conversion factors were applied in order to compensate for differences in elevation, temperature, humidity and barometric pressure. The conversion factor for Ennis was 0.9744, while North Star Dragway calculated out to 0.9835.
| Facility: | Texas Motorplex | North Star Dragway |
| Elevation: | 500-ft | 640-ft |
| Temperature: | 78.8-deg | 72-deg |
| Humidity: | 54 percent | 46 percent |
| Barometric Pressure: | 29.85-hg | 30.21-hg |
| Calculated D/A: | 2,201-ft | 1,461-ft |
| Conversion Factor: | 0.9744 e.t. | 0.9835 e.t. |
| Configuration–Best | 60-ft | 330-ft | 1/8 ET | 1/8 MPH |
| Stock Converter | 2.00 | 5.56 | 8.45 | 85.64 |
| Vigilante Converter | 1.86 | 5.31 | 8.21 | 84.99 |
| Delta | 0.14 | 0.25 | 0.24 | <0.35> |
| Converted–Best | 1/8 ET |
| Stock Converter | 8.23 |
| Vigilante Converter | 8.07 |
| Delta | 0.16 |
| Configuration–Average | 60-ft | 330-ft | 1/8 ET | 1/8 MPH |
| Stock Converter | 2.02 | 5.58 | 8.48 | 85.34 |
| Vigilante Converter | 1.88 | 5.35 | 8.26 | 84.44 |
| Delta | 0.14 | 0.23 | 0.22 | <0.90> |
| Converted–Average | 1/8 ET |
| Stock Converter | 8.26 |
| Vigilante Converter | 8.12 |
| Delta | 0.24 |
Tools And Supplies
Loctite Metric Sockets and Wrenches Prybar Torque Wrench Tubing Cutter