How to test the MAFs yourself and How MAFs work - Page 16

cosioboy · 21st February 2006, 14:58

Wow, 160 L/hr must be a Board record!

Curious to see if this is more 'geographically" or 'Dinan' attributable...

Machtig · 22nd February 2006, 09:38

Quote:

Originally Posted by cosioboy

Wow, 160 L/hr must be a Board record!

Curious to see if this is more 'geographically" or 'Dinan' attributable...

160 L/hr is erring on the conservative side, my friend who was watching the display (I was watching the tach, and traffic) swears he saw 170L/hr, but I know on the previous run I saw 158L/hr then 160 something, so I just went with 160L/hr.

My OBD-2 software (mentioned at the beginning of this thread) should be here tomorrow, assuming the next day air really is, so I will be able to try the alternate test to see how these babies are working.

Machtig · 22nd February 2006, 09:42

Quote:

Originally Posted by Need4Spd

Nothing like being near the equator and at sea level, though it will be interesting to see if the Dinan stuff is responsible for any of this. Anyone else in Hawai'i that has a stock M5 who's run this test?

I have only seen 2 other M5s on the island, a blue one and another black one. The blue one was driven by some middleaged chick and the black one by an asian male. Neither looked like they were "enthusiasts".

DavidS · 22nd February 2006, 10:10

Quote:

Originally Posted by Reverend73

My OBD-2 software (mentioned at the beginning of this thread) should be here tomorrow, assuming the next day air really is, so I will be able to try the alternate test to see how these babies are working.

Are the Dinan MAF housings the same inner diameter as the OEM?

MAFs report how much the air flowing past the sensor cools the heated sensor. Like guessing wind-speed in the winter from how much you freeze.
Just like you easily can tell the difference between no wind and the slightest breeze, and you can telll the difference between a breeze and a storm using your sense of chill, so can the MAF sensor.

If the Dinan MAF housings are bigger than the OEM, the MAF signals you will see on the OBD-II system might not be scaled correctly. It all depends if Dinan changed the MAF-voltage-to-actual-airflow lookup table or not.

I think that when tuning they don´t really need to calculate the actual airflow, they can do it all in one place and just set up the MAF-voltage-to-injector-timing table to pick up all the "slack" from all the modifications.

It will be very interesting if you could obtain both fuel-flow data and ODB-II MAF data from the exact same runs.

Cheers,

David

Ocean's M5 · 22nd February 2006, 22:08

I was thinking about purchasing the PEAK TOOL but when reading previous posts, it seemed that in conjunction with my Laptop I could simply purchase The software--->

Quote:

(I use the one called "ISO" from www.obd-2.com which I am very pleased with)

Does the software cover as many codes as the Peak Tool or does one need both together to get all possible codes?

DavidS · 22nd February 2006, 23:27

Quote:

Originally Posted by Ocean's M5

I was thinking about purchasing the PEAK TOOL but when reading previous posts, it seemed that in conjunction with my Laptop I could simply purchase The software--->

Does the software cover as many codes as the Peak Tool or does one need both together to get all possible codes?

The drawback of the Peak tool is it does not give you any real-time data at all. It does however give somewhat more detailed fault-codes.

I have never used the Peak tool myself. Better look at their web-site for the details.

David

hudson · 23rd February 2006, 04:43

Quote:

Originally Posted by Reverend73

My OBD-2 software (mentioned at the beginning of this thread) should be here tomorrow, assuming the next day air really is, so I will be able to try the alternate test to see how these babies are working.

I have been reading all the data on their web site and thinking about buying it for my shop. I'd be interested in your opinion on it.

DavidS do you have this software?

Joe

DavidS · 23rd February 2006, 12:27

Quote:

Originally Posted by hudson

I have been reading all the data on their web site and thinking about buying it for my shop. I'd be interested in your opinion on it.

DavidS do you have this software?

Joe

Yes, I have the software and interface called "ISO" from www.obd-2.com. IMHO it is excellent value for money.

Apart from reading OBD-II emissions related fault-codes,
what I like about it is that it is good at plotting and exporting real-time data.
You can select what real-time data to get from the car, and look at the graphs while the data is logged. Then you can export the data as a CSV file (comma separated values) which can be imported straight into excel.

David

bayerischemotor · 23rd February 2006, 12:41

Quote:

Originally Posted by bayerischemotor

Tested mine today at -9C

The result at 3rd up to 6000rpm (slippery outside and approaching traffic) I got 131l/H.

Let´s see: 3rd gear at 6k RPM, that is about 130 km/h. In Finland that would cost a considerable fraction of your yearly income (this is how speeding fines are calculated in Finland), if noticed by the police.

Good thing they didn´t catch you!

David

Woops, I guess this is the weird post you mentioned to me David?

hudson · 23rd February 2006, 14:36

Quote:

Originally Posted by DavidS

Yes, I have the software and interface called "ISO" from www.obd-2.com. IMHO it is excellent value for money.

Apart from reading OBD-II emissions related fault-codes,
what I like about it is that it is good at plotting and exporting real-time data.
You can select what real-time data to get from the car, and look at the graphs while the data is logged. Then you can export the data as a CSV file (comma separated values) which can be imported straight into excel.

David

Daivd,

Because I deal with all types of cars I'd probably opt for the Tricom version. I'm always looking for something new when it comes to reading live data from engine control units.

Thanks
Joe