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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 09-24-2004, 09:43 PM   #1 (permalink)
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Another round of intake discussion? Oh NO.

This round will represent our final thoughts and reflections. Many thanks to your input on this rather interesting topic.

I wish to make an openning statement and post some questions:

In part one we extensively covered cold/warm/hot air induction/routing/baffling/filtering/shielding or lack of. So much for that! The air is in regardless.

Now we know that a computer program controls the air-fuel mixture on our cars. and the most important single piece of information needed (by this copmuter) is the how much air/quantity of Air mixed with the how much fuel and thus a mixture and a spark.

And to further complicate and/or deal with this magic mixture; BMW engineers have unleashed their armada of MAF, TPS sensors, fuel injectors, precat O2 sensors to name a few. That is to regulate, to control, to deliver, and to fine tune this mixture alas O2 sensors.
Now we're witnessing a new shift in our vocabulary; a shift towards using words like rich/lean mixtures', O rings, injectors, vacuum leaks etc etc

Questions for further reflections:

How does BMW measure the temp. of this air?
Measured by a sensor? Yes but where did BMW settle on its location?
Is it at the inlet where everyone (on this forum) believes it is a cold air?
Or is it at MAF right after the Air box filter? $300 some dollars piece of electronics!

Whatever we decide on; we ought to examine the following questions:

1. Does the air at the MAF represent an accurate measurement of the ambient air?
2. Measuring the air at the MAF location, is it a good practice to assure CORRECT air/fuel mexture under the spark plug?
3. If I move (for the sake of this argument) the MAF from its current location right to the tip of the inlet; what would happen other than loosing it in a flood?
Would it really measure the actual ambient temp.? Would that be a more accurate measure to the actual outside/air temp. i.e. just like the outside temp indicator on the dash?
4. Finally does the BMW computer REALLY CARE about variation in the outside temp. Now think a BMW exported to Saudi Arabia 120 degrees VS. Another exported to Russia 40 degrees below in winter??? Would the latter have some sort of heavy duty air pump to preheat?
billb

I would love to meet one of these engineers face to face; his/her lunch/dinner on me right here in NJ!!!! any one out there???
regards
billb
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Old 09-25-2004, 07:51 AM   #2 (permalink)
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Many of these issues I have no comment on...However.

BMW has calibrated thier sensors to support the stock location of the MAF. If you are going to build an intake, do not remove/move/modify the MAF housing. It could cause undesired results.
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Old 09-25-2004, 07:40 PM   #3 (permalink)
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D3

I do support your position on the MAF 100%. For any modification it has to begin after the MAF starting with the stock filter box downward. As you know the idea is to elevate the tip of the intake. PLEASE SEE PIC BELOW

Also following LOS's advise I finished cleaning the angel eyes. Interseting though today I took the stock fog lights apart each one had a bout 1/4 of a cup of water in it (I guess becuase it is sealed) but once I dried it the bulb turned right on. It did violate the rules of electricity!! the power seats motor did not make it out of the water and so the motors for the back windows however. Will post some pics of the final cleanup.

hey D3 thanks for all the help you gave me man.
D3: a question TO GO for you: Do you know what type of a 1932 car in this black/white picture to the left of your screen. Yes the one under BILLB
regards
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