The NEW DW Injector Flow Report

Tuesday, May 18, 2010 - 10:58am

It's an industry exclusive and one of our customers favorite features of our product...All DeatschWerks sets of injectors include a personalized flow report featuring flow data, coil data, and horsepower calculators all tailored to YOUR set of injectors.

There is a lot of info packed into this report and it can be a little overwhelming. This month our tech blog will walk you through each section of our report and teach you how to get the most out of it.

Testing Information - This section lists the injector part number along with other data such as the manufacturer, application, coil type (high or low impedance) and testing pressure. We test all of our injectors at the industry standard of 3 bar (43PSI).

Flow Data – This section is the heart of our report. It shows the injector number and the flow rate of the injector in both cc/min for the import guys and lbs/hr for the domestic guys. We also test each injector statically and dynamically. Static flow rate is measured when the injector is held wide-open. This is how injectors get their “rated” flow rate. But this is not how injectors operate in your car. In the car, your injectors pulse open and closed to deliver a precise amount of fuel at the precise time when it is needed with each engine cycle. This is called testing the injector dynamically. We test our injectors at 6000 rpm's with 15m pulse widths. This is equivalent to 75% duty cycle. We test and balance the sets at this particular engine speed because this is often where peak power is made. We display all the flow data in both a table form and in a graphical form.

System Limits – This section approximates how much power your system of injectors can support at different BSFC's and Duty Cycles. BSFC (brake specific fuel consumption) is a measure of how much fuel is consumed per horsepower produced. BSFC is different for every car and it determines, in part, how much fuel injector you need. Efficient engines yield lower BSFC's. A lower BSFC allows less fuel to be used in producing a certain amount of power. In general, naturally aspirated cars are the most efficient (~0.4 to 0.5), followed by turbo charged cars (~0.6) and then supercharged cars (~0.7). You also need to consider what max injector duty cycle you are comfortable with. DeatschWerks injectors are tested to be linear and safe to at least 90% duty cycle and this is a reasonable limit for a street application. However, if you have a dedicated track car that spends large amounts of time in the upper end of the power-band, 90% duty cycle is not recommended. Keep in mind that the system limits proposed in this section of the report are rough guidelines. Every set-up is different and there are far too many factors involved to put a hard number to it.

Fuel Pressure Correction – DeatschWerks injectors can handle over 100 psi of fuel pressure. However, your fuel pump, line fittings, and the rest of your fuel system most likely will not be able to keep up. This is why we only list fuel pressure corrections up to 80psi. However, if you want to run more fuel pressure to get more flow and the rest of your fuel system is designed to handle it, you can use the calculators on our website to calculate flow rates at higher pressures.

Latency Data – This is the new section of our report. Latency data has always been available for our injectors via email or phone but now we include them right on the report. Injector latency tuning is the secret to getting the best tune. In the past, many tuning systems did not allow for adjustment and the ones that did only allowed input of one or two voltages. Modern tuning systems give full control over latency tuning. We test each injector with 43psi of pressure from 7 volts to 17 volts in 1 volt increments.

Notes – This is the section that we use to make any special notes on your particular set. We always suggest the use of an upgraded fuel pump. We also always suggest that you follow the included installation instructions.

Well, there you have it. It is a lot of information but when you break it down section by section it is pretty easy to understand. We go through a lot of work to give you all possible information we can about your DeatschWerks injectors. It is worth it because it helps our customer end up with a better tune and better overall experience. Also, if you have any questions about the report whether before or after purchasing your injectors, just give us a call and we will be more than happy to help you out.