Does anyone know how to...
AudiWorld Super User
Joined: Nov 2000
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I've got the stock MAF voltage vs. airflow transfer function...
it's around here somewhere.
Here it is:
<img src="http://pictureposter.audiworld.com/12130/transfer2.jpg">
If you only need a few points, you can use the pic, otherwise, I've got the 256 data points the ECU uses.
Here it is:
<img src="http://pictureposter.audiworld.com/12130/transfer2.jpg">
If you only need a few points, you can use the pic, otherwise, I've got the 256 data points the ECU uses.
Thread Starter
Junior Member
Joined: Oct 2003
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this is simulair to what I need
We are doing some work on a DSM which uses a Von Karmen Vortex MAF, which meters in HERTZ rather than Volts and we are trying to determine how the hertz relate to g/s or what have you
Member
Joined: Jan 2003
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I think the curve is different on a DSM...
the equivalent voltage readout is not necessarily the same airflow as on the audi. If you want I can send you to some REALLY knowledgable DSM guys. I know a few guys that play with their MAF signal using a MAF Translator. Some use DSM Link to control their A/F and some use a Super AFC.<ul><li><a href="http://www.dsmparts.com/maf_translator.htm">http://www.dsmparts.com/maf_translator.htm</a</li></ul>
AudiWorld Super User
Joined: Nov 2000
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There are a couple ways you'll be able to get that information....
since every meter has a different calibration.
1st is by hacking the ECU and interpretting what the transfer function is.
2nd is by having the stock meter flowed
3rd would be to put a meter with a known transfer function inline with the stock meter, and datalog both.
1st is by hacking the ECU and interpretting what the transfer function is.
2nd is by having the stock meter flowed
3rd would be to put a meter with a known transfer function inline with the stock meter, and datalog both.
Thread Starter
Junior Member
Joined: Oct 2003
Posts: 538
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Heres the whole story
A friend is going up to a TD06H-20G. His options were AFC, VPC, GM MAF tran or this new unit that alot of the DSM guys are trying now, it used to be a big supra thing, but now they developed it to work with hertz mafs.
So after talking to soem people he decided he wanted to give it a shot. The VPC is not only a dinosaur but its not even in production anymore, the AFC has lmitations on how big you can go, and the GM maf was really the first option till this came about.
Anyway, it has an auto learn function in which you run it with your maf in place, this way it learns how psi/rpm related to hertz and so forth.
Problem is, we have to run it on the stock turbo, because if we run it on the 20g we will hit fuel cut INSTANTLY.
So it autolearns on the 14b, or and then we will have to adjust it accordingly, which Im not sure how to do, OR we write the map from scratch.
Input values on it are in hertz...so I believe.
But take a look, show a friend and let me know what you think we can do about it
<a href="http://www.performancemotorresearch.co.nz/index.html">Heres the link</a>
So after talking to soem people he decided he wanted to give it a shot. The VPC is not only a dinosaur but its not even in production anymore, the AFC has lmitations on how big you can go, and the GM maf was really the first option till this came about.
Anyway, it has an auto learn function in which you run it with your maf in place, this way it learns how psi/rpm related to hertz and so forth.
Problem is, we have to run it on the stock turbo, because if we run it on the 20g we will hit fuel cut INSTANTLY.
So it autolearns on the 14b, or and then we will have to adjust it accordingly, which Im not sure how to do, OR we write the map from scratch.
Input values on it are in hertz...so I believe.
But take a look, show a friend and let me know what you think we can do about it
<a href="http://www.performancemotorresearch.co.nz/index.html">Heres the link</a>
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Member
Joined: Jan 2003
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yes the input values are in HZ,
and I don't know any DSMer's running that system. Most I know run DSM Link or the MAFT with the GM MAF or a SAFC. And they are running Force Performance Red's and Larger 
I'll e-mail this thread to my DSM guru and get back to you.
I'll e-mail this thread to my DSM guru and get back to you.
