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Old 01-01-2009, 03:40 PM   #1
Scooby Specialist
Member#: 41754
Join Date: Aug 2003
Location: san ramon
03 wrx
gt35r, 2.5L, meth

Default Anyone switched from MAP to MAF based controllers?

Yo guys,

Just wondering if anyone's switched from boost to MAF based and their thoughts. After doing everything cheap I'm doing some driveability mods to make the car more "driveable", things like going blowthrough (I have an FMIC so this should improve throttle response)

And I'm considering replacing my SMC controller with something like the Labonte unit http://www.labontemotorsports.com/st...ow/VC-MAF.html

Now, theoretically alky/WI should be based on airflow, and boost isn't a completely accurate representation of airflow, so theoretically the injection should be more accurate tapping the MAF signal. My question is if you have done this, did you notice positive effects? Think it's worth it for me to do?

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Old 01-01-2009, 06:06 PM   #2
Former Vendor
Member#: 67024
Join Date: Jul 2004
Location: Atlanta, GA
2009 BMW 135 I
space grey


You may be interested in our map/maf controller. Incase you are not aware I will link you to it. It can inject based on just boost, or just MAF or it can inject based on boost using MAF as a threshold, or it can inject based on MAF using boost as a threshold or lastly and most cool it can take boost and maf and inject using both signals. The last option is the most popular of the maf + boost options we have. the controller would have boost from 1-30 on the MIN and MAX, so you control that. The MAF is programmed in the controller as MIN (1 volt) Max (5 volt) you can adjust the Min and MAX MAF if you want. The default map is 50%. this means it will take the dutycyle of the boost min/max and the dutycycle of the MAF min max and average them together using a 50/50 MAP. You can change that Averaging PCT from 1 to 100%. For example if you set it to 20, it would give boost a 20% and MAF an 80%. Check it out, I am glad to help if you have questions. The averaging function is not listed on the detail, however this verion (1.06) is capable. Its the same controller as in our WRX/STI stage 2 Kits.

Using MAF and Boost you will get a much more predictable curve.

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Old 01-04-2009, 12:46 AM   #3
Scooby Specialist
Member#: 103320
Join Date: Dec 2005
Location: Oklahoma City
1998 swapped
Forester L


MAF is a great way to run these injection kits. Not a lot of people do it though, because MAP triggering is easier for most people to understand and install.

My favorite is the Aquamist FIA-II module which ramps injection according to fuel injector duty. Makes for hassle-free easy tuning.

Tuning MAP/MAF is easy too, but isn't as elegant as using IDC.
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Old 01-10-2009, 12:28 PM   #4
Scooby Specialist
Member#: 124263
Join Date: Aug 2006
Chapter/Region: MAIC
Location: Now with DB Super 16g and WI!
2004 WRX Wagon
RomRaider + UTEC Tuned


I have the Labonte unit that works off of the MAF. I'm very happy with it and would recommend it. I have zero issues of any kind.

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