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E34 (1989 - 1995)

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Old 01-09-2013, 10:55 AM
Microtesties Microtesties is offline
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Location: Concord, NH
Join Date: Oct 2012
Posts: 101
Mein Auto: 1990 BMW 525i
Thumbs up Miller MAF Conversion

Hello everyone, just thought I'd do a quick review on my newest modification. After researching available upgrades for M20 engines I found the pickins are pretty slim. One thing that intrigued me though was the AFM to MAF swap. From a physics standpoint the AFM clearly has quite a lot of air resistance. Since more air is more power I decided to invest the $350 and buy the kit.

I got it in the mail and was a little surprised to see it didn't come with instructions, no problem, that's what the internet is for. So I started the install and was amazed at how easy it was. Splice two wires, install the chip, and plug it in, that's it. At first start up I was pretty unhappy, it would bog down tremendously with throttle, so I ran back to the instructions. I double checked my work and saw that I plugged in the MAF upside down Oops! Once I corrected my mistake I started it up again and I was in love. The responsiveness was great and induction sound was mean too.

After a test drive I was even more happy, their seemingly over-exaggerated claims of about 20 hp and 22 torque were real! I was very satisfied with the results, I was able to accelerate much faster and cruise at lower RPMs without problems. I recommend this kit to anyone with an applicable engine, it's definitely worth the money!

Here are a few pictures I took of everything. Personally I'm not a cone filter guy, for multiple reasons, so this is just a temporary set up. Even though I don't like them, cone filters do sound awesome. Once I'm able to build some sort of adapter I'll reinstall my factory air box. If you have a MAF conversion post your opinions and pics as well!
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Year: 1990
Model: 525i
Transmission: 5 speed
Mileage: 250k
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Old 01-09-2013, 11:12 AM
BMR_LVR's Avatar
BMR_LVR BMR_LVR is online now
Humble E34 lover
Location: Asheboro, NC
Join Date: Dec 2008
Posts: 5,469
Mein Auto: 1992 525i
Most problems are usually something simple !

Originally Posted by noego View Post
It's Deja Poo - as in, I've heard this **** before.

Calypso Red 1992 525i with 225K miles

1991 735i - Sold
1992 525i - Sold
1995 325is - Sold
2000 528i - Sold

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