Tuning Tips


Tuning Tips


In order to provide the best custom tuning experience possible, CRT Performance recommends printing and completing the following form and bringing the results to your scheduled tuning session, or even email or fax it to us ahead of time.  The form can also be downloaded here.

Customer Name




City/State/Zip Code


Phone Number


Year/Type/Model of Vehicle




PCM Code (A9l, GTG3, etc.)


Injector Size


MAF Size, Type and Calibration


Fuel Pump Size


Engine Cubic Inches


Engine Compression Ratio


Heads Used, Ported or Unported


Throttle Body Size & Type


Exhaust System Type


Fuel Type (Regular, Premium, Race, Diesel)


Cam Specs (duration@.050, gross lift, etc.)


Supercharger/Turbo Type & Boost Level


Ignition Type


Nitrous Type (wet or dry) and Shot Size


Rear Gear Ratio


Manual or Auto Trans & Type




Thermactor ON/OFF


Preferred Idle RPM Setting


Preferred Rev Limiter RPM Setting


Preferred Two-step RPM Setting (’99 & up)


Preferred Shift Point Settings (Auto)


Spark Plug Gap Setting


Other Pertinent Info:


CRT Performance also recommends that the following be done before arriving for your session:

  • Timing set at 10-degrees BTC (SPOUT out) for Ford EEC-IV vehicles
  • TDC verified, particularly if balancer has been removed/replaced
  • Fuel pressure set to 39.5 psi (vacuum off) for Ford EFI vehicles; others please call to verify proper setting
  • New copper spark plugs properly gapped and installed


Other dyno and tuning session tips are:

  • Make sure that FRP sensor is connected to the boost side of the blower on blown applications
  • Make sure all spark plug wires are good including coil wire
  • Make sure PCM and its diagnostic ports (including OBDII) are functioning properly
  • Make sure the drive tires are in good condition
  • Make sure all belts, hoses and the cooling system are in good condition and up to the task
  • Oil, coolant and other leaks should be fixed prior to arriving; badly smoking cars should be repaired before arriving
  • Check for ancillary PCM trouble codes if possible before arriving.  We can check for codes before running/tuning if desired at additional time/cost
  • For blown cars, be prepared to disconnect the FMU; have vacuum line plug/cap available
  • For blown cars, if no FMU is used the injectors and fuel system must be sized properly for the power level expected;  serious engine damage could result if the injectors and/or fuel pump are not up to the task
  • For blown cars, the ACT must be placed after the blower (not before like on ’94 & up vehicles)
  • For forced induction cars with returnless fuel systems, we highly recommend the use of a 2003 Mustang Cobra fuel tank and pumps or similar extreme duty fuel system.  Normal fixed duty cycle EFI pumps will not work on a returnless system.
  • Nitrous-equipped vehicles should come prepared with full bottles.
  • Vehicles with driveline vibration may not be tested.  This is for the safety of our customers, their cars and ourselves.
  • For chipped cars, please have your PCM exposed and hanging for easy access by the technician.  This will save us time and you money.
  • Exhaust leaks will dramatically affect the air/fuel measurements taken.  If possible, repair any/all leaks prior to your appointment.  We may not be able to provide meaningful air/fuel results for vehicles with significant leaks.

CRT Performance has two means available for measuring air/fuel ratio (AFT) during you dyno and tuning sessions.

  1. Slip-on tailpipe adapter w/ wide-band O2 sensor
  2. Welded bung installation at/near the header collector w/ wide-band O2 sensor

If you prefer the welded bung approach (better response and results => preferred method), please let us know this at the time of your scheduling.  If you don’t have a bung already welded in place, we can supply a bung and weld it into your for you.  We will need you to arrive approximately an hour before your scheduled session in order to provide this service.  An additional cost of $75 is incurred for each bung you wish to have installed.  This price includes the bung, welded installation and a plug for the bung.  


CRT Performance has an optical pickup sensor available for use on diesel vehicles. There is no additional cost for the use of this sensor.

CRT Performance also has an intake boost (up to 45 psig) & vacuum (NA applications) sensor module available for use.  An additional cost may be incurred depending on the installation required for the vehicle. 

Please read and understand the following warning. You will be asked to read and sign a general waiver of liability before your car is dyno tested.  No signature = No dyno test.


Use of a chassis dynamometer will subject your vehicle to severe operating conditions including sudden accelerations, decelerations, high speeds and extremely high loads.  Though infrequent, equipment failures do occur under these conditions.  As the vehicle owner, you acknowledge these risks and agree to hold CRT Performance, LLC, its owners and employees, harmless.

As owners and operators of the dynamometer, CRT Performance personnel are trained in the proper use of the dynamometer, including how to respond to anomalous conditions that may occur during the use of the dynamometer.  Insurance liability prevents anyone, other than employees of CRT Performance, LLC from operating the dynamometer.  

For the protection of the vehicle, yourself, CRT Performance and others present during dynamometer testing, please follow any and all instructions provided by CRT Performance.

The owner of the vehicle under test will be presented with and expected to sign a general waiver of liability acknowledging these and other risks inherent with dyno tuning and operation of performance vehicles.