M20B28, MAF conversion

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aceifty
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Wed Jul 18, 2012 5:15 pm

Hi,

I did a M20B28 conversion last year and now im thinking of getting the MILLER MAF with the W.A.R chip.

This is the link for the conversion.

https://www.millerperformancecars.com/c ... gory_id=45

My question is, has anyone on here used this and would anybody recommend it?
steve_k
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Wed Jul 18, 2012 5:17 pm

There's a few on here who've done the conversion.

PM Daimlerman as I know he's got the miller kit.
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MillRat
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Thu Jul 19, 2012 1:56 pm

I have it and like it a lot. For me it is easily the best bang for your buck tunable ECU available for early model BMW's and very easy to install.

Obviously, as it uses the factory wiring loom it has limitations in how much tuning it can provide, but it will comfortably handle fuel mapping, ignition timing, adjustable rev limiter plus a few others (more options with M5x engines and above running VANOS). I also like the option that it allows you to store 4 different maps that allows you to use the car for a wide range of purposes. For example if you occasionally track your car, you could have a road (fuel save) tune as well as a race tune that no further than a flick of a switch away.

I use the Miller 3" MAF and their WAR chip on my 2.9L M20 in my race car and it makes it very easy to retune the engine every time I make a modification.

My only criticisms are that they have not yet developed a way to display the AFR data as a 3D map, however I do understand that are looking at changing that. Also, it is a little "quirky" for the dyno guys as they have to turn the engine off every time they want to make a change to the map. This means; a pull on the dyno, look at where an adjustment needs to be made, make the adjustment on the laptop, tune the car off, upload the new map with the new adjustment, turn the car back on and re-dyno... This is one of the few quirks with having to read/write through the factory ECU.
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Cheers,
Michael.
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Gunni
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Thu Jul 19, 2012 7:03 pm

Thats not a stock ecu quirk, it´s a problem with how they have designed the miller chip.

A emulator can do all that live.
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reggid
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Fri Jul 20, 2012 9:14 am

also you dont need multiple maps on a NA car unless you use different fuels. An economy map and performance map can be one and the same
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MillRat
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Fri Jul 20, 2012 2:28 pm

reggid wrote:also you dont need multiple maps on a NA car unless you use different fuels. An economy map and performance map can be one and the same
True.
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Cheers,
Michael.
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