94-95 Mustangs Electrical MAF
From Mustang-Tech
coracc4tsitl
Contents |
What is it?
A mass airflow sensor is used to determine the mass of air entering an electronically fuel-injected engine. The air mass information is necessary for the engine control unit to calculate and deliver the correct fuel mass to the engine. Air changes its density as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the vehicle's operating environment, and this is an ideal application for a mass sensor.
Cleaning
The MAF is a delicate piece of electrical equipment, so some care must be taken when handling the sensor. The stock mass air flow sensor is held in place with two T20 torx screws. After removing the screws, gently lift it straight out of the tube. It has 2 sensitive wires you must take care not to damage them. Some suggest spraying electrical contact cleaner on a qtip and brushing the wires. I suggest just spraying the electrical contact cleaner directly on the wires. It will eat through any oil and grime and dry quickly. It is a good idea to clean the MAF after oiling your air filter. Excess oil will get on the MAF and may cause issues.
Flow Rates [1]
| Meter | Flow Rate |
|---|---|
| Stock 5.0L 58MM (89-93 Mustangs) | 606 CFM |
| Stock 5.0L 70MM (94-95 GT/Cobra Mustangs) | 815 CFM |
| Pro-M Bullet (75MM) | 964 CFM |
| Ford 80MM (Lightnings) | 1017 CFM |
| C&L 73MM | 1171 CFM |
| Modified 80MM (Flow Bar Removed) | 1368 CFM |
| C&L 80MM | 1415 CFM |
| Pro-M 77MM (Shorty/Supercharged Version) | 1543 CFM |
| Pro-M 77MM (Standard Version) | 1562 CFM |
| Pro-M 83MM | 1598 CFM |
| Pro-M 80MM | 1612 CFM |
How MAFs and Your Tuning Device Work [2]
Thanks to final5-0 for this
Can the twEECer make my stock-sized MAF flow more air?
NO!!! The twEECer can't make any MAF work with any combo.
We all know the GT & Cobra use the exact same MAF.
This MAF was designed by Ford to report airflow a GT or Cobra can generate with a bit more breathing room up top as well. It just so happens for THAT amount of airflow, you need 19's or 24's.
Notice the MAF was designed for airflow and NOT for injector size.
This is where we need to drive home the idea that MAFs report airflow and that airflow is then converted to a voltage which is sent to the PCM.
Say you bolt on a blower and you peg that OEM MAF. That happened because at, say 4500 rpm, you exceeded not only the amount of airflow a GT or Cobra could generate but you also exceeded the maximum amount of airflow Ford designed that MAF to measure.
For all practical purposes, you generated airflow at 4500 rpm that was converted to a MAF voltage of 5.0 volts. The PCM can only accept a maximum MAF voltage of 5.0 volts.
The twEECer can do nothing to make the OEM MAF work in this situation.
You now have to go to another maf that has the ability to accurately measure more airflow.
What About Using a Different OEM MAF?
Same kind of deal as above in the case of a Lightning MAF. Ford designed it to measure the airflow a 351 cubic inch blown motor can generate. Once more, just as in our example above, they did not design that MAF to be used for 42 lb injectors. If you've got a motor that can produce that amount of airflow, you are gonna need that size of injectors to adequately supply its fuel needs.
Here is where we bring in the twEECer to help us make it all come together.
How we do this is we use data supplied from Ford about the Lightning MAF that tells the relationship of airflow to voltage it reports. This data can be called the meter's transfer curve you've seen so much talk about before.
We've now got a MAF that won't peg or report 5.0 volts.
You could look at it as... things are now similar to the original OEM setup in the fact that we've got maximum airflow at say 75% of the capabilities of the MAF.
Now, the most important thing to see here is this:
We've now got all this going on with the additional blowers airflow. We are ACCURATELY reporting airflow just as we did with the little OEM meter and OEM GT or Cobra motor.
We also will need to use the twEECer to accurately report to the PCM about our new injector size such as 36, 42, 55lb, etc.
So now we got the PCM understanding TRUE airflow in a voltage range of 0.0v to 5.0v and it also understands that amount airflow will be used with 42's NOT 19's.
Links
- MAF Wiring Harnesses
