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Old 05-31-2005, 01:10 PM   #1 (permalink)
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Maf to MAP

Everyone nows that an SR20DET uses a MAF sensor
i want to know how can i convert my SR20det that is MAF to MAP sensor?
can anyone tell me how?
any links on how to?
any documentation?

thanx
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Old 05-31-2005, 01:18 PM   #2 (permalink)
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They're the same thing. You just have to make sure you use the ECU for the corresponding part (USDM SR20 MAF - use USDM SR20 ECU)
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Old 05-31-2005, 01:23 PM   #3 (permalink)
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Quote:
Originally Posted by hosmer
They're the same thing. You just have to make sure you use the ECU for the corresponding part (USDM SR20 MAF - use USDM SR20 ECU)


MAF= Mass Air Flow
MAP= Manifold Absolute Pressure aka speed density.

The only way I'm aware of is running a standalone. I think I remember reading that the Emanage can also do it, but I'm not sure.
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Old 05-31-2005, 01:31 PM   #4 (permalink)
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Quote:
Originally Posted by Gargoyle
Everyone nows that an SR20DET uses a MAF sensor
i want to know how can i convert my SR20det that is MAF to MAP sensor?
can anyone tell me how?
any links on how to?
any documentation?

thanx
Run a standalone. A few of us are discussing how to convert the stock ecu using editing software but this is quite a complex process that probably won't be figured out very soon.
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Old 05-31-2005, 01:31 PM   #5 (permalink)
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^^ Tomei did that. They sell their ECUs for a hogillian dollars.

Find a MAP sensor, hook it up to the car. Get the values at certain points that your car puts out on the MAP sensor and the MAF. Make some resistor pack to change the values in line to the ECU. Do-able. HOWEVER, it will only be good for a certain barometric levels and air temps. With big changes in either you would have to change the resistor pack around. You could set up an intake air temp sensor and have that edit information sent from the MAP to the ECU. Probably a lot more work that it is worth.

I would say go with like a megasquirt but then you have to ditch the Direct Ignition and get a dizzy and ign wires. Then you could set that up to run on a MAP sensor.

If you have more money and don't want to mess with a dizzy, AEM ems.

If you are made of money and want me to tune it for you get the Tomei ECU. It is pretty!
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Old 05-31-2005, 01:32 PM   #6 (permalink)
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Quote:
Originally Posted by hosmer
They're the same thing. You just have to make sure you use the ECU for the corresponding part (USDM SR20 MAF - use USDM SR20 ECU)
MAFs and MAPs are very different.
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Old 05-31-2005, 01:33 PM   #7 (permalink)
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they are no the same!!!

MAF = Mass Air Flow
Definition: is a way to measure the amount of air an engine takes in (engine load). This sensor not only measures the volume of air but also compensates for its density as well.

MAP = manifold absolute pressure
Definition: Refers to a manifold absolute pressure sensor, a variable resistor used to monitor the difference in pressure between the intake manifold at outside atmosphere.

what i want is to convert my sr20 fromo maf to map

thanx again
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Old 05-31-2005, 01:36 PM   #8 (permalink)
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Quote:
Originally Posted by LOVEMUFFIN
Find a MAP sensor, hook it up to the car. Get the values at certain points that your car puts out on the MAP sensor and the MAF. Make some resistor pack to change the values in line to the ECU. Do-able. HOWEVER, it will only be good for a certain barometric levels and air temps. With big changes in either you would have to change the resistor pack around. You could set up an intake air temp sensor and have that edit information sent from the MAP to the ECU. Probably a lot more work that it is worth.
You couldn't just "hook up" a MAP sensor. You wouldn't need to anyway, their voltage response is linear unlike MAF sensors. The math for MAP sensor response is simple. Making the conversion requires altering the factory ECU's VQ map as well as the load axes of every other map.
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Old 05-31-2005, 03:57 PM   #9 (permalink)
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what would the benefits be by switching?
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Old 05-31-2005, 04:19 PM   #10 (permalink)
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Quote:
Originally Posted by coalitionSE-L
You couldn't just "hook up" a MAP sensor. You wouldn't need to anyway, their voltage response is linear unlike MAF sensors. The math for MAP sensor response is simple. Making the conversion requires altering the factory ECU's VQ map as well as the load axes of every other map.
So your telling me you can't hook a MAP sensor up to a car 12v-GND-VAC... like I did mine.
Then run the car... like I did mine.
And get voltage readings from the MAP sensor... like I did mine.

Well f-ck, someone call the reality police 'cause I am breaking their laws.

No, it does not require and ROM tuning. You can force the car to run on a base map and change that using input from the MAP sensor. I am not saying anyone can do it. But with enough electronics knowlege it can easily be done. By the time you are done you will have fine tuned a very sell-able product too. How the hell do you think Apex came up with the S-AFC, some car god gave them magic in a plastic box. That kind of stuff is not magic and you don't need a fancy display to make it work. I believe there is a guy in Austrailia working on this very thing right now.
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Old 05-31-2005, 04:24 PM   #11 (permalink)
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Quote:
Originally Posted by Gargoyle
Everyone nows that an SR20DET uses a MAF sensor
i want to know how can i convert my SR20det that is MAF to MAP sensor?
can anyone tell me how?
any links on how to?
any documentation?

thanx
Why exactly do you want to do it, you seem like you dont know what your talking about and it seems like you only want to do because " everyone" is doing it. A z32 maf is more than enough or even a blow-through setup will get the job done. With maps its easier to tune, but that doesnt mean its impossible to tune on a maf
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Old 05-31-2005, 04:41 PM   #12 (permalink)
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Quote:
Originally Posted by LOVEMUFFIN
So your telling me you can't hook a MAP sensor up to a car 12v-GND-VAC... like I did mine.
Then run the car... like I did mine.
And get voltage readings from the MAP sensor... like I did mine.

Well f-ck, someone call the reality police 'cause I am breaking their laws.

No, it does not require and ROM tuning. You can force the car to run on a base map and change that using input from the MAP sensor. I am not saying anyone can do it. But with enough electronics knowlege it can easily be done. By the time you are done you will have fine tuned a very sell-able product too. How the hell do you think Apex came up with the S-AFC, some car god gave them magic in a plastic box. That kind of stuff is not magic and you don't need a fancy display to make it work. I believe there is a guy in Austrailia working on this very thing right now.

So you installed a MAP sensor, removed the MAF, and didn't touch the ECU. Please by all means tell us how.
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Old 05-31-2005, 05:16 PM   #13 (permalink)
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Jeebus christ no! I just hooked the MAP up to see what the peak reading and the base reading was and a few points in between. I did not use it to run my car. I never said I used it in place of the MAF, just used it to get some starting data so I know what range to include in my fuel map.

Last edited by LOVEMUFFIN; 05-31-2005 at 05:18 PM.
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Old 05-31-2005, 05:20 PM   #14 (permalink)
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Quote:
Originally Posted by Gargoyle
Everyone nows that an SR20DET uses a MAF sensor
i want to know how can i convert my SR20det that is MAF to MAP sensor?
can anyone tell me how?
any links on how to?
any documentation?

thanx
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Old 05-31-2005, 05:22 PM   #15 (permalink)
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Quote:
Originally Posted by Gargoyle
Everyone nows that an SR20DET uses a MAF sensor
i want to know how can i convert my SR20det that is MAF to MAP sensor?
can anyone tell me how?
any links on how to?
any documentation?

thanx
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Old 05-31-2005, 06:45 PM   #16 (permalink)
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just like everyone else.... wondering why you want to convert from a MAF setup to a MAP setup.... I can think if a couple logical reasons, but I want to hear why you want to and also to see if it'd make sense to in your situation.
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Old 05-31-2005, 08:35 PM   #17 (permalink)
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Well for one you could have just an airfilter on the turbo inlet. No piping. Open atmoshpere blow off. and a few other things. It wont be able to compensate for changes in the barrometric preasure or atmosphere. But it can be effective in some situations. Now my P11 has both a MAF and a MAP.
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Old 05-31-2005, 08:56 PM   #18 (permalink)
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Quote:
Originally Posted by sakerocket1
Open atmoshpere blow off.
That's actually a performance negative. But it simplifies the piping.
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Old 05-31-2005, 09:08 PM   #19 (permalink)
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Quote:
Originally Posted by spdracerUT
That's actually a performance negative. But it simplifies the piping.

not so much on a speed density system. With a maf it is hard to run right.
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Old 05-31-2005, 09:26 PM   #20 (permalink)
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Quote:
Originally Posted by sakerocket1
not so much on a speed density system. With a maf it is hard to run right.
Well, I mean when you recirculate, the air goes back to the turbo at a fairly high velocity helping to keep it spun up reducing lag on the shifts.
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