Well, I never have tested the 1/4 times w/ my GTEC. I believe that the GTEC has a more accurate ET than the track because the track just estimates your time. The GTEC will also be off 3-4 mph on your trap speed.
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'94 Cobra
308ci, ported GT-40 heads, Crane 2031 cam .513"/.529" lift 276°/282° duration, 70mm TB, Custom 80mm MAF, JMS chip, Vortech S-trim 8#, MSD, TREX fuel pump, Accel coil, 3.55's, FMS 1 5/8 headers, BBK Offroad H-pipe, and 2-chamber flows.
1994 Mustang Cobra
Check out the pics of my Motor Buildup!