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DFAS Performance Chip Punk Performance

The Digital Fuel Adjustment System
Tuning with Punk Performance On this page we will cover some of the basic details and uses of the DFAS. For full information please visit our website http://www.punkperformance.com/ Wanting to control the air-fuel ratios on your vehicle, Car, Bike, Boat or Truck?  Want the most power friendly or economical mixture right through your rev range? Do you have the dredded flat spot and have tried everything to fix it? If you have run in to the problem where your ECU can no longer keep up with your engines capabilities, Punk Performance PROBLEM SOLVED, even if your just wanting to make sure your stock rocker can handle it when you do give it some stick, The DFAS will make sure it loves it!, If you tuning for economy, We'll guarantee the DFAS will pay for itself.  Easy, Reliable, Affordable   What will you need? A multimeter, heat shrink, solder and soldering iron. All available from this our website or at any electronics store. For any enquiries on our products please email: ceo@performanceautochip.com
 	Overcome boost cuts Tune and Modify air/fuel ratios for power or economy Allow air-flow meter or injector swaps Change closed loop running characteristics FREE LCD Controller used to program the Digital Fuel Adjustment System (No laptop or computer required)
Unlike any other commercially available interceptors on the market. It is affordable in cost and very easy to fit and tune. It offers fantastic drivability and it is no exaggeration to say the release of the Digital Fuel Adjustment System (DFAS) is set to revolutionize the electronic performance industry. With over two years in development by the best electronic minds in the world, numerous of prototypes and hundreds of hours spent testing and tuning on an enormous variety of vehicles, The DFAS is immense with capabilities! Do not be fooled by its apparent simplicity (four wires to connect). In use the DFAS has left many experts out there speechless after driving a vehicle equipped with the Digital Fuel Adjustment System! Adjusting Air/Fuel Ratios vehicle to run very rich mixtures at high loads to provide a measure of safety if the car is held at a sustained full throttle for an hour or two. So instead of an air/fuel ratio of (say) 12.5:1 at full throttle/high load, the standard Electronic Control Unit (ECU) will provide a much richer air/fuel ratio of 10.5:1. In most modified cars running the standard electronic management, the air fuel ratios can be even richer! If these mixtures can be leaned out, power will improve. So what does all this have to do with intercepting your air-flow meter? Well the ECU decides how much fuel to inject into the engine primarily on the basis of the airflow meters signal. When the engine is consuming a lot of air, the air-flow meters output voltage will be at the high end of its range. This means that if an air-flow meters output signal varies from 1V at idle to 4V at peak power, the signal output in the 3V to 4V range will need to be changed to lean out high end mixtures. Specifically, to lean out the top end mixtures, these voltages need to be slightly reduced. The DFAS can make these sorts of tuning changes with ease, reducing or increasing just those voltages that need to be altered while leaving the rest of the signal untouched. Changing Full Load Air/Fuel RatiosA typical use for DFAS will be to adjust full-load mixtures by modifying the out put of the Air-flow meter. In RUN mode, the display can be used to work out which load points need to be changed. For example, at low loads (e.g. Idle), the minimum load point displayed might be 30. In cruising conditions, the loads points around 50 might be shown, while at wide open throttle at high revs, load points in the 100-120 range might come up on the display. In this case, it’s the latter area where changes will need to be made. In other words, if you have an assistant watching an Air/Fuel ratio mater and the LCD Controller, It will soon become obvious at which load points changes need to be made. if you have the DFAS connected in Coarse mode, don’t change the output voltage in large steps, as the air/fuel ratio might then dangerously lean. Instead, start off by making small reductions or increases until you get a feel for sensitivity of the system to changes. As described above, keep the voltage changes at adjoining load points smooth so that there’s no sudden jump in values that could cause the engine to stutter. Then it’s simply a case of adjusting the voltage levels up or down at the different load points until the desired air/fuel ratios are achieved. If it is well-tuned, the DFAS gives absolutely factory drivability- and tuning is very easy. Overcoming a turbo boost cut If the vehicle cuts fuel and/or ignition on the basis of the signal received from a MAP sensor or Air-flow meter, the DFAS can be used to limit the sensor’s output voltage so that the ECU never sees a high enough level to trigger the boost cut. The load point at which the ECU cuts fuel can be read in real time by monitoring the input in RUN mode. The load points above this point can then be reduced just enough so the cut no longer occurs. Note that depending on the vehicle, the air/fuel ratio may also be changed by this process – it’s wise to check the air/fuel ratios before and after implementing this modification. Changing Injectors If larger injectors are fitted, the DFAS can be used to reduce the output of the Air-flow meter so that the correct mixtures are retained. In order that the ECU can still stay working roughly within its normal operating envelope, such an injector change shouldn’t be radical, otherwise idle stability may suffer and the car may also not drive very well. Larger injectors require changed values at all load points which are accessed and this tuning is best carried out on a dyno with a good air/fuel ratio meter. Changing Air-flow meters An air-flow meter electronically compatible but slightly lager can be fitted and then the DFAS used to recalibrate its output. As with injector swaps, in order that the ECU stay working roughly within its normal operating envelope, such a change shouldn’t be radical. Again all load points accessed by the engine are going to require mapping and this is best achieved on a dyno. Changing Oxygen Sensor Signals The DFAS can be configured for the 0-1V signals commonly outputted by the oxygen sensors. The resolution remains at 128 load points and the tuning calibration at 127 adjustments up or down, giving extremely fine tuning. The DFAS can be used to alter closed loop mixtures (in the same manner as for Air-flow meter signal modification). Although because of the sudden step in the oxygen sensor voltage as mixtures pass through stoichiometric, some experimentation will be needed to get the right results.  The DFAS can be used in a number of different ways- more commonly it is used to intercept the Air-flow meters signal. In many vehicles, the air/fuel ratios are not set for maximum power. Normally the manufacture sets up the Conclusion Extensive testing on the DFAS on a wide variety of vehicles showed that it has extremely effective tuning control over air/fuel ratios, together with very easy tuning and simply brilliant drivability it is the best performance for its price.

A Serious Performance Chip at a Superior Price

The DFAS manufactured by Punk Performance is an interceptor piggyback styled performance chip and is more commonly used to map fuel mixtures on vehicles equipped with a MAF, MAP, Hotwire or Vane type air-flow meter.

It works by taking the voltage from the signal wire on one of these sensors. The signal wire on a typical MAF sensor for instance will have a variance in voltage of around 5 volts. The MAF sensor is primarily what the ECU uses to determine and control the air-fuel mixtures while the vehicle is under load. The DFAS is used to intercept this signal and place it on a MAP inside the main unit. The MAP can be up to 128 sections across depending on the type of vehicle its being fitted to. At each section of the map the voltage levels of the air-flow meter can be adjusted up or down, effectively allowing you to map out the air-fuel mixtures with the LCD controller. Simply view the load point being displayed to you, press the up button to richen mixture, push down to lean off. Its that simple.
The chip has a fine and coarse mode for tuning and can be calibrated for most MAF sensors 0-5 or 0-12 volts, It also has a 0-1V mode for controlling the signal of Oxygen sensors, great for changing closed loop mixtures.

The chip itself is extremely low in cost compared to similar products on the market, fitting is a breeze with only four wires to connect, it is super effective and very easy to use. This is an excellent option if you need to control your air-fuel ratios and don't want to spend a fortune doing it.

The DFAS Digital Fuel Adjustment System
· Overcome boost cuts
· Tune and Modify air/fuel ratios for power or economy
· Allow air-flow meter or injector swaps
· Change closed loop running characteristics
For further info or to get your very own DFAS just go to
http://www.punkperformance.com/


This demonstration is a Kia Cerato on its final run after being fitted with the
DFAS unit by Punk Performance.

The vehicle was basically stock on arrival fitted with a Cannon exhaust tip and K&N air filter. This year and model Kia stock standard is rated at 105hp. The vehicle runs fairly rich out of the factory, The Cannon exhaust and K&N Air filter fitted to this one improved power and Air-flow but left the vehicle running lean and slightly on the dangerous side. We implemented the DFAS Fuel Controller to add fuel throughout the rev range as a measure of safety. You can see power improved again and we now have a beautifully smooth running engine. The Changes made on the DFAS tune were very minimal and still has plenty of room for adjustment as needed up the track.
For example The DFAS can add fuel or lean off at any load point up to 128 sections each way.
The DFAS in this case the highest adjustment we made was 15 points leaving a further 113 point of adjustment if needed at that section.



This is the Dyno Chart showing before and after implementation of the Digital Fuel Adjustment System. We didn't get the chance to get a dyno before the Cannon Exhaust and K&N air filter were fitted. But you can look up the factory specs and see the 105hp rating.



Fitting of this chip was done by Daryl Robertson Auto Electrical Service in Horsham Victoria and the Dyno Tuning was done by Boss Muscle Cars in Horsham Victoria.


These guys are truly the best there is in the Wimmera there businesses are third parties to punk performance and operate independently. They treat all of our customers with the highest respect and have very fair pricing. They do a job once and the do it well. A special thanks to these great businesses.

Click here to view Boss Muscle Cars Website
Click here to view Daryl Robertson Auto Electrical website