Things You Must Have for a Proper Tune

Realspeed Automotive offers dyno testing and tuning using our Mustang MD1100-SE Dyno. Dyno machines are not cheap. Accumulating expert-level tuning experience takes years. Finding a building where the landlord will allow the installation of a dyno is difficult. For all these reasons, time on the dyno costs money. To make your dyno tune go smoothly and to avoid extra dyno charges, please carefully read the following list of things you must have for a proper dyno tune:

• Fresh fuel (less than 2 months old) of the same type and octane rating that you plan to use whenever you are running your Realspeed Automotive tune.
• At least a half a tank of fuel or more. All power-adder cars, big-cammed cars, E85, or any car requiring a lot of dyno time should come in with a full tank. If we have to use up dyno time refueling your car it will cost more than just the price of the fuel.
• A fitting in the exhaust for our dyno wideband air / fuel ratio sensor (O2 bung). In some cases, we can use one of the factory rear O2 sensor bungs. In others, we will need a separate sensor bung welded in. Call the Realspeed Automotive for clarification before your tune date.
• Proper registration, insurance, license plate, working seatbelt, headlights, turn signals, brake lights, and safe suspension and brakes, so that we can perform a street test drive to make final adjustments to the tune. A real-world driving check is included in the price of a Realspeed Automotive tune. However, if we can’t safely test the car during your original tune appointment you will be charged for any follow-up adjustments that are required.
• Good ignition wires and/or coils with no burns, no cracked insulation and tight connections to all spark plugs.
• Good fresh spark plugs of the correct type, heat range, and gap. Dyno time is expensive. Spark plugs are relatively cheap. If the car is misfiring , even the slightest, it will degrade the quality of your tune. When in doubt, change them. Call us for recommendations before your tune appointment.
• No exhaust leaks between the engine and the muffler. ANY leaks located from the engine back to a distance 1 foot rearward of the rear-most O2 sensor will compromise the accuracy of the tune.
• No excessive fluid leaks (oil, antifreeze, transmission fluid, and rear end fluid). You will be charged for cleanup.
• No fuel leaks whatsoever.
• No unresolved trouble codes or “check engine” lights. Unless the check engine light is for something that you have specifically discussed with us ahead of time, don’t assume it will be fixed by the tune alone. To properly calibrate the tune all sensors and equipment must be working properly and no trouble codes should be present.
• No vacuum leaks (air leaks) anywhere in the intake manifold or air intake tract from the air filter to the engine. We have special equipment to check for leaks. Call us ahead of time to make an appointment if you are not sure.
• The fuel filter must not be clogged. Consult your owner’s manual for recommended service intervals. If you have modified your car to substantially increase its power then you will need to change the fuel filter more frequently to ensure adequate fuel flow though the factory sized filter. (e.g. if the factory service interval is 30,000 miles you should change it every 15,000 if you have added a supercharger).
• Tires with enough traction for the power level you plan on making. Don’t show up with 5-year old, all-season tires, if you are planning on making more than 450 horsepower. If you can’t get traction on the street in 3^rd gear, we can’t get traction on the dyno. Get some drag radials.
• Matched tires of the same diameter on the left and right side, in good condition with no cracked or dry rotting and no exposed cords. Top speed on the dyno usually ranges from 120 to 170 mph, depending on the vehicle. Make sure your tires are safe for these speeds.
• Driveshaft bolts securely tightened. U-joints in good condition. All driveline components and fasteners tight, secure and in good condition. This should be obvious, but we have had to stop more than one dyno session because the driveshaft was about to fall out.
• The cooling system must be working properly. We cannot tune a car that is overheating. We can fix your cooling system for you but you must make an appointment for that BEFORE your dyno tune.
• The alternator must be in proper working order and the battery in good condition.
• For supercharged vehicles: GT500, Lightning truck, 03-04 Cobra, or any car with an intercooler pump, please make sure your intercooler pump work is working before you arrive. You should be able to see the coolant circulating in the reservoir when the engine is running.
• The engine, engine computer, and wiring harness must all be grounded properly with good, clean, and tight connections. All factory grounds must still be present.
• If your vehicle is over 7 years old or sits unused for more than 6 months, we highly suggest you remove your fuel injectors from the engine and have them professionally cleaned. During the tuning process the tuner/calibrator is measuring the Air/Fuel ratio from only one (or two) location(s) and making the assumption that all fuel injectors are flowing the same rate. If you have one or more poorly flowing fuel injector then some cylinders will be starved for fuel while others will get too much fuel. Reduced performance and possible engine damage will result from this condition. Engine damage due to unevenly flowing fuel injectors is NOT the responsibility if the tuner.
• At a bare minimum, it is a good idea to run a high-quality fuel injector cleaner such as Redline Fuel Injector Cleaner though the engine for at least 2 tankful before your dyno tune. It is preferable to run the fuel injector cleaner prior to the tune and then put in fresh fuel without any injector cleaner for the actual tuning session.
• An oil and filter change is a good idea prior to tuning, if it has been more than 3,000 miles since the last oil change or if the engine has been repeatedly flooded from a poor tune or any other reason.
• If you are unsure of the condition of your engine please make an appointment to have us perform a compression check and a visual injection of the engine before your tune appointment. If we find a problem with the engine during tuning you will still be responsible for the majority of the cost of the tune session. It is better to check things out ahead of time.
  

Important Notes for New Builds and Cars That Have Been Sitting for a Long Time

Mechanical Limitations

The tuner’s job on the dyno is to develop and fine tune a calibration specific to your vehicle, not to fix every single thing that is wrong with it. If your car requires mechanical repairs, those can be addressed by our mechanical / install facility and will be charged separately from the dyno tune. 

A dyno tune cannot, by itself, fix certain mechanical or electrical limitations. For example, if the fuel pump on the car cannot deliver sufficient fuel for more than 400 horsepower, no amount of computer tuning is going to make the car produce 600 horsepower. As respected calibration engineer Greg Banish, the author of Designing and Tuning High-Performance Fuel Injection Systems said, “I can’t fix that with my keyboard.” The same can be said for Mass Air Flow (MAF) sensors, ignition systems, O2 sensors, supercharger bypass valves, poorly designed tubing causing MAF turbulence, slipping clutches, radiator fans, water pumps, vacuum leaks, clogged exhaust systems, bad engine grounds, alternators, electrical wiring, or a whole host of other problems and limitations.

If you are unsure of the condition of any of these things , please make an appointment for us to inspect the car prior to the dyno tune. Even so, some problems may not become apparent until the car is on the dyno. As the car owner who has decided to modify your car, you are responsible for the repair or the modifications necessary to overcome these limitations, whether you chose to pay Realspeed Automotive to fix them or to take the car back and fix them yourself. The cost of the time on the dyno will still be charged even if we can’t complete the tune due to a mechanical or electrical limitation of your car.