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Pre-Tuning Vehicle Review

Pre-Tuning Readiness Checklist (Read Before Your Appointment)

We are seeing a growing number of vehicles—both remote and in-person—arrive not mechanically ready for tuning.

A great calibration cannot fix mechanical issues. Vacuum leaks, exhaust leaks, wiring problems, weak ignition, or bad fuel will waste time and delay results. A little prep on your end saves everyone hours.

Please review the following before your tuning session.

Battery

  • Battery must be fully charged

  • Tuning often requires the key on / engine off

  • Applies to both remote and in-person tuning

Exhaust & Wideband

  • No exhaust leaks (pinholes are leaks)

  • ALL O2 sensors must be connected

  • Wideband must be installed in a dedicated bung
    (rear O2 bung acceptable temporarily)

  • Notify us if the wideband is:

    • Downstream of the catalyst(s)

    • A tailpipe sniffer

  • Notify us if the vehicle uses an exhaust cutout

Fuel

  • Minimum ½ tank of fuel

  • Fuel must be less than 90 days old

  • Old fuel must be diluted with fresh fuel

  • Correct octane must already be in the tank

    • Asking for 93 tuning with 87 in the tank = problems

  • Ethanol users

    • Test every fill-up

    • We do not do max-effort tuning on inconsistent pump ethanol

  • Injector data must be accurate

    • Incorrect injector size will completely derail the tune

Intake

  • If running an air filter, it must be clean and recently serviced

  • Dirty or restricted filters affect airflow and calibration

Ignition

JTEC vehicles (1996–2004, excluding Viper):

  • NGK spark plugs

  • Brass cap & rotor

  • Quality plug wires (Firecore recommended)

  • 400+ whp requires an MSD 6AL or equivalent

    • Without it, spark blowout is likely

Spark Plug Guide

  • Gen 3 Hemi

    • N/A: factory gap

    • Boosted: 

      • 0.029" for stock boost level
      • 0.027" for 15psi
      • 0.024" for 18 psi
      • 0.022" for 20psi
      • 0.020" for 22psi
      • 0.018" for 24psi

    • 25+ psi: email us

  • Early 5.7: NGK 2314 (N/A)

  • 6.1: NGK 2315

  • 5.7 Eagle: NGK 6619

    • 650+ whp: NGK 2309

  • 6.4 Apache: NGK 6510

  • 6.2 Hellcat: NGK 2309

    • 20+ psi: email us

  • 318 / 360 / Jeep I6

    • Mild N/A: NGK ZFR6F-11

    • Power adder: NGK BKR7E (.035")

  • 4.7

    • N/A: NGK BKR6E-11

    • Power adder: NGK BKR7E-11 (.035")

  • Gen 2 / Gen 3 Viper

    • OEM Champion plugs (yes, seriously)

Suspension & Safety

  • Control arm bushings, shock bushings, and motor mounts must be solid

  • These are safety-critical, even on a dyno

Tires & Wheels

  • No dry rot

  • No missing lug nuts

If you’re unsure whether your vehicle is ready, ask before your appointment. Showing up unprepared delays tuning and may require rescheduling.