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Messages - millerperformance

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To find all your answers to our BMW mass air flow conversion look no further. This comprehensive list of common questions should help you further decide if a Miller Performance Mass Air Flow Conversion is right for you.

What are the gains I can expect from the MAF System?
The MAF System replaces the stock AFM. We guarantee at the VERY LEAST the same gains as the leading performance chip. However, on top of that we also guarantee a better mid range, a flatter torque curve and drastically improved throttle response. Unlike the AFM, there is no "door" restricting flow. Due to no obstructions during part throttle you are able to flow more air into your engine. The chip provided with the System allows for your ECU to run the car as if the MAF sensor was an original BMW component. As far as recorded power gains go, you can expect and increase of 15 - 30 HP and 15 - 30 Ft. Lbs of torque at the wheels, depending on which engine you have and what MAF product you are using.
What is a good performance chip? How does our MAF compare?
There are plenty of chip makers out there. The price reflects the knowledge that goes into tuning those chips. If you look at our MAF conversionss however, you will see it provides more than just a performance chip. Not only are you getting a well developed chip with the MAF, you are also getting an updated Air flow sensor that will allow for better results compared to JUST a chip. Most Chip companies say your car will gain 20 - 25 hp from their chip, but what they aren't telling you is that those numbers are based on use with different Cams, exhaust etc. How can just a little change of software really make a 20 HP difference without engine modifications. We are the only company offering this valuable Chip & MAF Sensor package. The time spent on recalibrating the entire fuel and load parameters, timing maps along with other important parts, matched with our MAF will yield better results than any other chip out there.

I already have an aftermarket chip, do I need the chip that comes with your MAF?

We include our software with our MAF conversion products because the software is MANDATORY. Any time you change the sensor related to air metering on a vehicle, you must recalibrate the entire fuel code side of things to use the sensor properly. An aftermarket performance chip that is not written for OUR MAF will have severe drivability issues. Our software is not only calibrated to use and understand our MAF sensor, it is also performance tuned on the dyno.

Do I need the W.A.R. Chip to use your MAF?

No. The Miller MAF conversions and the Miller W.A.R. Chip are separate, independent products. However, they do work absolutely great together. As stated above, Miller MAF software is 100% required when using our MAF conversion. If you decide to use the W.A.R. Chip, the same Miller MAF software is available to use on the W.A.R. Chip.

We recommend the W.A.R. Chip for all M cars that want to use our MAF as well as any non M car that is highly modified aside from our conversion or has plans to do so. If you are basically stock and only want to add our MAF to your car, you do not need the W.A.R. Chip.
Does the Miller MAF Conversion System work on my car?
Miller performance has MAF conversions for the following cars:

e24 635 M635 & M6
e28 535 & M5
e30 325 & M3 (No MAF for 325e cars)
e32 735
e34 525 535
Porsche 944

The most important part to determine if our MAF will work for you is to look at your BOSCH ECU number. If you have a car with a BOSCH ECU that we support, regardless of your chassis, you can use our MAF conversion. If you don't find your ECU number on our store page list, we do not have a MAF solution for you.

Will the MAF work with future plans I have with my car?
Of course the MAF will work with you no matter what your plans for your car are especially if you are using the W.A.R. Chip! Your engine has to know how much air you are flowing and thus the need for an air sensor is always there. One way to measure airflow is with a MAF. When you decide to upgrade different components of your car, there is always a need to re-tune your car to its "new" full potential. Because our MAF System is calibrated in the ECU, it is easy adjust the software as needed.

Is the MAF hard to install?
We find on average, a first timer will take about 70 to 90 minutes. Once familiar with the setup, it usually takes, at most, 45 minutes to install.

What are some common problems?
Our MAF's are all strictly quality controlled after production and once more before shipping. We are human so sometimes mistakes can be made. However, the most common problem is that people fail to read the manual. Improper installation is the number one cause for problems with our MAF system. We can't stress enough that the manual must be read to install the product properly. BMW master mechanics are the worst for this! (Sorry guys) They always install without reading the manual and call us up to complain that the product doesn't work. A little humble pie is served up quickly  :P

The next most common problem is physically plugging the BMW connector on backwards. This is dangerous because it can sometimes lead to a shorted MAF sensor. If that happens, you are on the hook for a new sensor.

Another common problem is that there are mechanical deficiencies with the car to begin with. No matter how hard you make us try, we will not tune out mechanical problems. Our MAF software and the conversion is strongly proven. On a properly sorted car with no major mechanical issues, the MAF will work and function as advertised and expected.

Finally, a little less common but common enough is simply using the wrong sensor housing size and or wrong software calibration for the given application. This usually happens when someone buys the product second hand and the seller tells the buyer what they want to hear to make the sale. If you are ever in doubt about what you should buy from a second hand seller, shoot us an email or phone call. We can tell you if what you are buying will work for you or not. We aren't going to try and make a sale to you, it is more important that the users of our products are educated and happy with the system.

Can I run bigger injectors?

Yes, If you see the application listed on the store page or you use the WAR Chip in conjunction with our MAF.

It is a common misconception that adding bigger injectors will increase your power. Without proper tuning your are only hindering your engines performance. And again, bigger injectors are not the best option for power improvements.

Can I use a cam and/or and exhaust with the MAF?

Yes, we have a variety of software for your application.

Naturally Aspirated Tuning / Re: 98 Octane tune HELP!!
« on: December 30, 2014, 07:36:49 PM »
Your 98 is the same as our 93. The tune will be fine. You may be able to get away with a small bit more timing if you don't have a catalytic converter. Australia uses a different rating system for fuel octane. In North America, we go by RON+MON/2

Turbo Tuning / Re: Running Lean
« on: December 22, 2014, 04:05:36 PM »
Try adding a bunch of fuel to the low end of the part throttle fuel maps. Turn off your O2 sensor as well and see if that helps.

Turbo Tuning / Re: Running Lean
« on: December 20, 2014, 08:29:37 PM »
Have you checked fuel pressure? Other than that, try adding a bunch of fuel to both part throttle fuel maps in the RPM which this happens from the first column to say the 6th. Also, is it just lean at this small throttle positions or is it lean like this everywhere?

Naturally Aspirated Tuning / Re: M50 non vanos tuning help
« on: December 14, 2014, 07:47:54 PM »
First thing is first, to do any sort of tuning without being on a dyno, you need an air fuel ratio gauge. We sell them for only a few dollars above cost so that we can make sure everyone who wants to tune their own car actually buys and uses them.

All of us here on the forum can help you tune your car and teach you things but we need to know the most basic of basic info. Air Fuel Ratio. Without it, you might as well try to catch falling knives in the dark.

Naturally Aspirated Tuning / Re: Best tune for m20b28
« on: December 14, 2014, 07:12:15 PM »

Use the stroker base tune. Make sure you installed the MAF correctly by going through our trouble shooting guide listed in the manuals section of our website. The stroker base tune is meant for the 3" MAF, 19# injectors, stock fuel pressure and the usual bits and mods that come with doing a stroker.

Please email us the air fuel ratio using the stroker base tune and we can modify it from there. It should be pretty darn close and if it is not, there are other mechanical problems affecting your engines tune.

Turbo Tuning / Re: What plugs should I run on me boosted e30
« on: December 14, 2014, 07:08:12 PM »
If the original posted comes to read his thread an notices that the user account has been deleted, please email us. We had a massive spam attack and we lost a couple legit users culling the hackers.

Thanks! Can you email us a picture of the car and a larger dyno sheet so we can share it on Facebook?

WAR Hardware Support / Re: Blow Through MAF Trouble shooting
« on: October 09, 2014, 03:43:51 PM »
What is the O2 sensor voltage doing? Is it just rich at idle? What is AFR at full throttle and partial throttle?

Turbo Tuning / Re: E30 Turbo Tuning Help
« on: September 30, 2014, 09:58:39 AM »
Did you wire the MAF properly?

WAR Hardware Support / Re: super rich idle with idle surge
« on: September 02, 2014, 03:21:38 PM »
Sounds like you are not using the correct base tune or you have you BOV after the MAF sensor.

WAR Hardware Support / Re: war chip wont write!!
« on: September 02, 2014, 03:20:35 PM »
What operating system are you using and what version of JAVA?

WAR Hardware Support / Re: Blow Through MAF Trouble shooting
« on: September 02, 2014, 03:20:01 PM »
What base tune are you using? .4 volts would be leaner not richer if in fact that was an accurate reading. The higher the voltage the more fuel the ecu would be calling for. If tuning adjustments are not making a difference I am curious if you are even using the turbo base tune.

Turbo Tuning / Re: w.a.r. chip base tune?
« on: September 02, 2014, 03:17:51 PM »
You don't **need** live tuning to be able to tune anything. All the new, current BMW's are tuned "Blind" so to speak and they are 100x more complex than OBD1.

As for logging, there are a few things. One, a dyno and what it can log is good enough to refine a tune. The WAR Chip is not a development tool to make a new tune from scratch. Two, if the tuner(s) understand how an engine works and how a MAF based system works, they should be able to tune the software with the use of a dyno without the need to log what cells you are using. Three, if you must log, you can use a scan tool like the LAUNCH X431 or BAUM iScan CS2000 to figure out what load column you are in. That is kind of overkill but sometimes necessary.

Hi Snoman.

You should never have to fill out a map. If you are starting with literally a blank map and NO values entered, you are doing things wrong. You do not have to worry about different temperatures, the stock ECU has those configured already and we have made fine adjustments to those types of maps. Once set up, they do not need tweaking for 99% of the cars. Unplug your barometric sensor. You no longer need that since you are measuring MASS directly.

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