Accelerometer

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In simplest terms, an accelerometer is a device that accurately measures G-force over time. G-Force is an instantaneous indication of acceleration and is multiplied by time to compute speed and again by time to compute distance. These units are completely self-contained and need plug only into a power source. Basic models report 0-60 elapsed time, 60-0 elapsed time, 1/4 elapsed time, 1/4 mile speed (terminal, if not trap), lateral G force and maximum G force. Newer models are more sophisticated with provisions for rollout, trap speed, and even dyno-like horsepower and torque charts. When compared to 1/4 mile time slips, accuracy is typically extremely good, though 1/4 mile speeds tend to read higher for basic models that report terminal speed (speed at the 1/4 mile mark) rather than trap speed (average speed over the last 60').

Accelerometers are most valuable to those without ready access to a drag strip or who desire a precision instrument that can measure performance consistently (e.g.- before/after modifications to determine impact). Popular options include G-Tech and MaxQData.

Performance

  • Owner: Jim Matthews
  • Car: 1994 Stealth TT
  • Turbo: TD04-9B, AVC-R (1st gen) @ 1.00 kg/cm^2 (14.223 psi)
  • Intake: K&N FIPK
  • Fuel: stock
  • Exhaust: stock
  • Drivetrain: stock
  • Suspension: stock ECS
  • Brakes: stock calipers, cryoed rotors, Porterfield R4-S pads, SS lines
  • Wheels: stock
  • Tires: Michelin XGT-Z4 245/45ZR17
  • Weight with driver: stock + 170 lbs
  • Accelerometer: G-Tech Pro
  • Calibration: ET accurate, terminal speed ~10 mph high
0-60 time 60-0 dist 1/4 time 1/4 speed lateral G notes
4.79 13.16 113.9 (~103.9)


  • Owner: Jim Matthews
  • Car: 1994 Stealth TT
  • Turbo: TD04L-13G, AVC-R (1st gen) @ 1.15 kg/cm^2 (16.36 psi)
  • Intake: K&N FIPK, IPS SS Y-pipe
  • Fuel: 450cc black tops, IPO/SX AFPR @ 43 psi, hotwired Supra pump, SAFC (5-knob)
  • Exhaust: Zorstec custom SS catback, EK2MFG dual-flex downpipe, enhanced precats
  • Drivetrain: stock
  • Suspension: stock ECS
  • Brakes: StopTech ST-40 calipers, cryoed 332x32 / 322x28 rotors, Axxis Ultimate pads, SS lines, Wilwood prop valves
  • Wheels: Enkei RPM-02
  • Tires: Yokohama AVS ES100 245/45ZR17
  • Weight with driver: stock + 170 lbs
  • Accelerometer: G-Tech Pro
  • Calibration: ET accurate, terminal speed ~10 mph high
0-60 time 60-0 dist 1/4 time 1/4 speed lateral G notes
4.25 12.41 121.3 (~111.3) unlevel road - slight descent
12.29 122.8 (~112.8)
12.16 123.6 (~113.6)
11.91 126.7 (~116.7) boost unstable in log - can't guarantee limit


--Started by bjmsam 01:00, 30 April 2008 (MDT)

This article originated from a thread or post on 3000GT/Stealth International. (1808)