Author Topic: M42 MAF Conversion: SUCCESS!!! (Read 44080 times)

nickmpower · « **Reply #45 on:** August 23, 2006, 11:16:47 PM »

so when can we expect these?

JetBlack95 · « **Reply #46 on:** September 18, 2006, 01:25:06 PM »

ok so you've gotten help a guy out here..... i understand the general workings of a motor, but before this bimmer i was mainly a fix whats broke kinda guy....... when we starting geting into the fuel injection system, or any of the computer, i just got confused and paid someone to do it....

so i'm cruisin in my 95 318, i'm pretty sure i'm running on an AFM, why would i want to swtich to an MAF?

bmwman91 · « **Reply #47 on:** September 19, 2006, 10:07:28 AM »

Why a MAF? :
- Better throttle response (esp. off-idle and below 3000RPM)
- Nearly eliminates the stumbly idle
- No more bogging-idle when coming off-throttle
- A little power gain (no numbers yet...will be once it is complete)
- Marginally better fuel economy / catalyst lasts longer*

I guess I owe an update.

I am like 70% done with Version 2.0 of this. I am using a Bosch sensor that wil fit the boot and air-box with $7 in rubber/silicone fittings and is better sized for this application. I have all the translation maps done and programmed into the magic box, but there is a similar issue to the one V1.0 had...but it occurs between 2000 & 3000RPM and is a lot worse (to the point that the ECU cuts the injectors). Now, the WBO2 sensor in my car crapped out on me, so that could be contributing to the problem. Once my replacement arrives (hopefully tomorrow), I will see what exactly is going on in there. The problem only persists at near full-throttle when below 3000RPM. Above there, if you floor it, it GOES. The car feels so peppy, I just hope gas never hits $5/gal because I will have to cut back on groceries to buy gas (Ramen is cheap, right?)!

The idle was smoother once again, and power came on stronger and more smoothly in the upper range. There is NO hesitation between 4000 & 4500RPM any more...it is smoother than it was with the AFM. I am really excited about this, and I am sure there are many who are more so than I. Just bear with me on this, I do not want to sell anything until I am confident that I will be dispensing a quality product; a product that I would be happy with if I purchased (and I am one of those customers you hate...I expect perfection).

*When you pounce the throttle, the flapper-door opens rapidly, and overshoots the proper position (it has mass, and carries momentum). For that brief moment the ECU is told there is a LOT more air flowing than there really is, and it will over-inject fuel for that moment. Extremely rich bursts like that foul spark plugs, build carbon deposits and reduce catalyst life.

JetBlack95 · « **Reply #48 on:** September 19, 2006, 10:16:41 AM »

so your going to be selling what with all this? programed MAF ready for bolt in? or are we going to be programing them ourselves? I have no problem (if your willing and all the problems are solved) buying a MAF for the conversion, shipping it to you, have you do the diddly on it and sending it back? or is it something i would have to do while its in my vehicle....cause i'm not so good when it comes to the electronics stuff.....I also wonder the differences between my OBD1 serpentine setup and yours when it comes to such a sensor....would be interesting

elmarkes · « **Reply #49 on:** September 19, 2006, 10:35:12 AM »

hi guy put me on the list i want to know how that will cost an probably comand one i am very iterest because a reonditioned one its 800$ cad
so pm me please

marc-andr�:)

Gizmo318i · « **Reply #50 on:** September 19, 2006, 11:33:36 AM »

Why did you use a Ford MAF?
I used a 328i MAF on my conversion, works beautifully!

Euro Nation · « **Reply #51 on:** September 19, 2006, 11:35:25 AM »

Quote from: bmwman91

*When you pounce the throttle, the flapper-door opens rapidly, and overshoots the proper position (it has mass, and carries momentum). For that brief moment the ECU is told there is a LOT more air flowing than there really is, and it will over-inject fuel for that moment. Extremely rich bursts like that foul spark plugs, build carbon deposits and reduce catalyst life.

Datalogs show that A/F hits the low 10:1 range when this happens. Not a good thing.

bmwman91 · « **Reply #52 on:** September 19, 2006, 11:49:38 AM »

I used a Ford one because of its low price and ready availability at wreckers. I was having a hard time locating a smaller Bosch one (that does NOT undergo the burnoff cycle) for a price that was reasonable. Nobody is going to want to have to sepnd $200 on the converter and then $300 on a MAF.

Thanks to Euro Nation here, he tipped me off to a unit used on later model VW's. I want to build calibration curves for a BUNCH of sensors though, so the buyer can use virtually whatever sensor they want/is readily available to them. Anyone have extra MAF's for me to borrow lol? I would love to map a M52 sensor.

This thing is intended to be plug-n-play. No programming needed by anyone. You snip your AFM harness, and substiture the MAF connector on the end, hook up to switched 12V power, secure the magic translator box and go. I will provide all connectors (will probably be simple bullet connectors since I do not want to make people go buy $20-$100 crimpers for fancy connectors). I will also ship extras so you can put them on the AFM connectyor should you ever need to go back to it. I would LIKE to ship these with nice weatherproof ones, but you need special tools to properly crimp the wires into the pins. If someone knows of a good way to go weatherproof without expensive tooling, let me know. it is in everyone'e best interest.

m42 fan · « **Reply #53 on:** September 19, 2006, 01:23:52 PM »

OK. Time for another idiot question. What is the downside to doing this, other than the price? What are the trade offs? This almost sounds too good to be true.

I'll admit I was a little turned off earlier when you were using the Ford Maf, mainly because of the need to go with a cone air filter/homemade intake. now that it looks like you can keep the airbox, I'm becoming seriously interested. i.e. put me down on your list of waiting customers!

brian

shellback · « **Reply #54 on:** September 19, 2006, 01:59:47 PM »

paypal standing by...

Chris

bmwman91 · « **Reply #55 on:** September 19, 2006, 03:30:35 PM »

Downsides...ummmm maybe there is a little more engine noise since there is no flapper door in there to mufle it?

You will also likely get ass mileage after this as you will want to floor it everywhere. I am not kidding.

jfdublyu · « **Reply #56 on:** September 19, 2006, 09:33:03 PM »

well i am DEF interested in being a pioneer in the buying of ur project when you get some kits made up. just keep us updated and im sure you will be making mad money and getting mad props from more than a few M42 owners. props man, good work

Gizmo318i · « **Reply #57 on:** September 20, 2006, 12:04:37 PM »

Quote from: bmwman91

Downsides...ummmm maybe there is a little more engine noise since there is no flapper door in there to mufle it?

You will also likely get ass mileage after this as you will want to floor it everywhere. I am not kidding.

I was getting an extra 50km on one tank after doing my MAF conversion.

romkasponka · « **Reply #58 on:** September 20, 2006, 12:10:32 PM »

Quote from: Gizmo318i

I was getting an extra 50km on one tank after doing my MAF conversion.

What converter you use for your maf conversion?

bmwman91 · « **Reply #59 on:** September 20, 2006, 12:29:31 PM »

Quote from: Gizmo318i

I was getting an extra 50km on one tank after doing my MAF conversion.

Well, I guess the MAF is just the gift that keeps on giving!

Author Topic: M42 MAF Conversion: SUCCESS!!! (Read 44080 times)

JetBlack95

JetBlack95

elmarkes