Author Topic: FEELER: Tunable MAF Conversion Interest? (Read 21759 times)

fiftytakedowns · « **Reply #45 on:** February 10, 2011, 11:41:26 PM »

ahhhh SHIIEIEEtt

bmwconnect · « **Reply #46 on:** February 10, 2011, 11:46:18 PM »

Very impressed! keep up the good work

nomade30 · « **Reply #47 on:** February 11, 2011, 01:28:49 PM »

I'm excited.

pdxmotorhead · « **Reply #48 on:** February 11, 2011, 09:59:45 PM »

You know,,, this would ROCK for tuning your car to run on E10,E15 or even E85...

Dave

bmwman91 · « **Reply #49 on:** February 12, 2011, 02:33:23 PM »

Yup, combining this with a tunable WB02 setup like the LC-1 would let you ru nwhatever fuel you wanted (that works properly in an Otto cycle motor).

bmwman91 · « **Reply #50 on:** February 14, 2011, 01:49:37 AM »

Just a little more preview action. The windows software is basically done. Now I need to polish off the firmware for the actual controller so I can test the software with the "real deal!"

jakeb · « **Reply #51 on:** February 14, 2011, 05:03:41 PM »

very nice!!! keep it up

bmwman91 · « **Reply #52 on:** February 15, 2011, 05:38:53 PM »

One additional update:

I think I am going to ditch the serial stuff in favor of USB. It'll add a little cost to the unit, but it'll certainly be less than the cost of a USB-serial adapter you'd get online or in a store. It would be a pain if I required users to have an available serial port, since I think some people might already be put-off by the fact that you need a computer to configure the thing. At least every laptop made in the last 15 years has USB ports!

fiftytakedowns · « **Reply #53 on:** February 16, 2011, 01:24:02 AM »

SO how does it feel? pull any harder?

bmwman91 · « **Reply #54 on:** February 16, 2011, 11:52:42 AM »

On a stock M42, there is unlikely to be any major gain in HP. The stock AFM is well-sized, and contrary to popular belief, the flapper door is not restrictive (there's maybe a 0.13 PSI drop across it...the TB & head lead to whole-digit PSI drops). The stock AFM is also running at 90%+ of its max capacity on a stock M42 (which is good design practice from BMW's end). That leaves very little room for built engines & forced induction.

However, I have found that idle stability improves, and the throttle response coming off of idle is noticeably better. All around, throttle response seems to benefit. This is likely because the MAF basically provides instantaneous output with no overshoot, versus the AFM that has a delay somewhere around 50ms and some major overshoot, so really it takes 50-100ms for the AFM to start giving proper output after a rapid throttle adjustment.

(note: if your O2 sensor is shot or you have vacuum leaks, your idle will still suck lol)

fiftytakedowns · « **Reply #55 on:** February 16, 2011, 12:14:16 PM »

ahaha, Im assuming though if you have ITBS or cams that this will reap more benefits?

bmwman91 · « **Reply #56 on:** February 16, 2011, 03:07:33 PM »

As far as power goes, the MAF conversion allows you to gain power by being able to meter more air. If you have a stock M42, dyno it, install a MAF (properly tuned) & dyno it again, I wouldn't expect there to be much of a difference.

With hotter cams & ITBs, you probably will stand to gain power with a MAF. Once you start flowing more than the stock design, the AFM can begin to be restrictive in a significant way since it was only designed to be non-restrictive in the stock application.

In short, yes a motor that has had intake system & internal mods will stand to gain power from the MAF conversion.

turbo 318 · « **Reply #57 on:** February 25, 2011, 11:54:48 AM »

fiftytakedowns · « **Reply #58 on:** February 27, 2011, 03:10:24 PM »

any updates?

bmwman91 · « **Reply #59 on:** February 28, 2011, 02:50:11 PM »

I'm still working on the conversion firmware. It's coming along pretty well.

What's going on in the pics above? Is that a flow calibration rig, or some kind of turbo inlet pipe?