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Your car, in stock form, came equipped with a Vane Air Meter (MAF) also called AFM. Since then, the technology has evolved. Newer high performance cars come equipped with a Mass Air Meter (MAF). There are many advantages to running a MAF instead of the VAF/AFM. A brief overview of both systems will help you make the correct decision.
The Factory Engine Control Module (DME) uses the VAF (or AFM) signal to calculate Load, Ignition and Fuel. The VAF same as the MAF generates a 0-5Vdc however this is were the commonality ends.
General advantages of a MAF vs. AFM/VAF:
- The MAF has no mechanical moving devices like the AFM
- MAF is much less restrictive than AFM.
- Stock AFM does not support hi-flow (kg/hr), once you reach a certain HP level, you max out the stock AFM. (You get max voltage). The stock 951 AFM flows in the 800-1000 kg/hr (or close to it), which limits its ability to support just 320 HP.
A well-calibrated MAF can flow in excess of 2500 kg/hr and can support 1000+hp.
- For more detailed comparison of VAF vs. MAF you can find many articles on the web, so I will not go into too much details.
- For a stock 951 engine with a K26, the MAF gives you better response quicker spool (wider area under the power curve). Once you start modifying your car or upgrade the turbo, the gains will be clear. A well known 3.2L 951 in the UK gained approximately 60rwhp by switching to our MAF. Ask any of our customers, they all love our products.
Key features of the Vitesse MAF kit:
Our MAF kits are designed to be a plug and play setup. Each kit is designed for a specific engine configuration. All of our MAF sensors are calibrated to handle in excess of 700 hp, so if you increase your HP output, you will not have to replace the MAF sensor. The MAF sensor comes with the integrated Air Temp Sensor.
Each kit comes complete with a MAF sensor, the appropriate Software, 3” J-pipe, wiring harness, hoses, clamps and installation instructions.
For those wanting the performance of the MAF, yet want to retain the factory appearance, we offer the “stealth” MAF kit. It replaces the stock AFM with a MAF in the same location. The Stealth kit comes with a MAF sensor, wiring harness, hose, clamp and adapter plate.
The Hardware:
Each Vitesse MAF kit is configured to provide you with years of trouble free and solid engine management solution.
Some the Vitesse MAF hardware key features:
- The Vitesse MAF kit comes complete with the MAF sensor, software on a chip/board and all associated items (hoses, clamps, air filter.)
- We use a custom calibrated MAF that can support lots of flow (measured in Kg/Hr) - Our MAF flows well over 2200 kg/hr -
(FYI - 500 kg/hr is approx. 160 hp, 1000 kg/hr approximately 320 hp, 2000 kg/hr approx. 720 hp)
- The MAF sensor we selected can support in excess of 700 hp. As a customer, using our MAF means when you increase your engine’s performance or upgrade the K26 to a larger turbo you can still use our system. A MAF that flows low kg/hr will be maxed out (same as the AFM) and becomes useless for your performance application.
- The MAF we use is very accurate, clean signal, reliable and very consistent between one sensor to the next. This translates into consistent engine performance and great drivability.
- Our MAF can be used in front or after the turbo, as a draw through or blow through system.
- We use a chip/board vs. a chip. This allows us to provide multiple images, when needed, (a image is the content of a chip) in a single device. Assume you have a 2.5L engine, but you plan to upgrade to a 3L in the future. You get 2 images on the chip/board one for 2.5L the other for 3L; select the one you want via a switch on the board.
The Software:
Vitesse software is the most advanced software you will find for your Motronic system. We actually rewrote the code to offer you many features not found elsewhere. We offer true MAF software, semi-sequential injection to support large injectors. Our MAF software comes with pump and race gas maps (fuel and ignition), selectable externally. We even support E85 when you select the V-FLEX upgrade. Drivability and performance are second to none. We Recently released the V-FLEX software for the 944/951, make sure to check it out.
Some of the Vitesse MAF software key features:
- The air mass is directly measured by the MAF, which is then interpreted correctly by the custom Vitesse MAF software in the DME. The factory AFM software does not understand Mass Air.
- Our MAF kit does not rely on external devices to convert the MAF signal to look like an AFM signal to be understood by the DME.
By using Air Mass in the software, we are no longer bound to the limits of the AFM and the original AFM software (which has many limitations as it was designed to work with the limited and restrictive AFM sensor).
- By dealing directly with Air Mass (directly with MAF signal), you can alter boost, temp changes etc. and your AFR will stay rock solid. With our software the DME always gets the accurate information (MAF signal), it interprets it correctly and uses a correct unaltered signal for the calculation. Keep in mind, we are not mapping the MAF signal to look like an AFM signal, our software understands and works with unaltered MAF signal. When you use a hi-flowing MAF and try to map it to look like a low-flowing AFM signal, many compromises and short cuts must be taken. We don't convert the MAF signal to look like AFM signal; we interpret it correctly as Air Mass in the DME.
- Our software enables you to run large injectors (such as 95#) with clean idle. When using large injectors, at idle, you must reduce injector’s duty cycle to a low level where the injectors are no longer stable. In order to raise the duty cycle to where injector flow is stable, we run in semi-batch mode.
Normal batch injection with the stock DME software fires all injectors twice per cycle. Semi-batch fires the injectors once per cycle for twice as long allowing large injectors time to flow properly in low flow conditions such as idle and cruise. The Vitesse DME software automatically switches between the batch and semi-batch operation as necessary while the engine is running
- Our software allows you to select between 2 maps (say for pump gas or race gas). We also offer you 2 Rev Limits. All externally selectable on the fly.
We recommend getting the Piggyback with your MAF kit for additional fine tuning capabilities.
If you have a unique setup, we offer custom tuning, just ask us.
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