Author Topic: M42 MAF Conversion: SUCCESS!!! (Read 44084 times)

mrjezza · « **Reply #30 on:** May 13, 2006, 03:34:34 AM »

Quote from: jfdublyu

congradulations on the success! I use a cone filter anyways that I have routed w/ a strait pipe and a 90deg. bend so that the filter is actually right behind the LEFT brake duct if you are looking at the FRONT of the car. I cut a hole out of the plastic dirt guard underneath the engine on the side so that the filter always has access to fresh air, even at idle. I'll try to get some pics of this. it works really well and i don't feel like i have any power loss even in stop and go traffic b/c of the heat shield and hole.

I'd love to see photos of this too!

Zoso · « **Reply #31 on:** May 17, 2006, 09:19:22 AM »

I don't know how I missed this thread. Congrats on getting the MAF to work!

sic///M · « **Reply #32 on:** May 29, 2006, 09:17:40 PM »

where did ya post the DIY. i'm glad someone figured this out..i gave up after 5 mins of tinkering with my multimeter. why would the resistance go up and then back to ~starting resistance. this is cool though.

bmwman91 · « **Reply #33 on:** May 30, 2006, 02:19:12 AM »

Hehe, well, the DIY will be for how to install a converter I am eventually going to be selling. My partner & I are finishing up a few things before releasing the product.

Regarding the VAM question: when you open the throttle (the effect is most prononced when you floor it fast/hard) the air flow into the engine increases suddenly. The 'trap door' opens further with this increase in flow (reducing the resistance). Now, the door has some mass to it, and prettymuch no damping, so it flies open past where it should be for the EXACT air flow measurement, just momentarily (not something you would be able to see on a multimeter, we are talking fractions of a second here). It is just an inertial effect of having a relatively massive object moving around as part of the measurement device (massive relative to the air flowing).

Now, even with a MAF you have the same effect due to the air acting as a spring-mass-damper system, but the effect travels at the speed of sound, and due to its very low density, the inertial effects within the flowing air are inconsequential at their most (within the primary intake track where the MAF & throttle plate are being considered...these effects define prettymuch everything about an engine's performance AFTER the throttle plate and within the exhaust manifold).

Aah, the joys of tinkering with induction systems. Ignorance is bliss...it all seemed so simple before I had 4 years of engineering class (only 1 more to go, YAY!).

zerofreez · « **Reply #34 on:** June 06, 2006, 07:45:25 PM »

Before I was into these cars I did a lot of work with DSM's (eclipse/talon turbo) and they had a similar device made for em. They had a translator box that took a gm hotwire mas air flow meter output and outputed to the ecu what it needed.

There is tons of research about this topic, I believe there is a yahoogroup on the topic as well. I just looked at the site of the guy who created it and apprently he has developed an upgrade that uses a gm map sensor and converts to a speed density design.

Well here is his site http://www.fullthrottlespeed.com/items~Cc~REGTRANS~iTpStatus~0~Tp~~Bc~.htm

Here is the yahoogroup http://autos.groups.yahoo.com/group/dsmtranslator/

He also has a messageboard, I also just noticed he added support for the mkiii supra, that uses a flapper style meter similar to ours.

bmwman91 · « **Reply #35 on:** June 07, 2006, 10:25:27 PM »

Very interesting...

I toyed with the idea (well, still am toying) of going to speed-density. I guess now that I am out of college & have free evenings/weekends I could start doing some data gathering. Benefit-wise though, speed-density offers a couple milliseconds better throttle response than MAF, a LOT more required tuning (on the developer end anyway), and at least as much custom plumbing.

tim_s · « **Reply #36 on:** June 26, 2006, 06:26:22 PM »

any news on this mr bmwman?!

bmwman91 · « **Reply #37 on:** June 26, 2006, 06:48:16 PM »

Heh, yes actually.

I am ordering the parts for the 8 half-ready converters this week. I still want to find a smaller MAF though. Well, I do not really care too much, but I don't want to get stuck with customers crying because the big Ford one is hard to fit and will not look perfect when in place. You'd think that saying "all install work & fitment is up to YOU the buyer, and the MAF is not something you just pop right in" would scare off the ones who can't turn a screwdriver, but i do not want to have to deal with refunds.

So, if people here want a converter as it stands NOW, I'll sell one no prob, but the 55mm Ford Mustang MAF is not gonna look like Conforti designed the setup or anything. That's why I want a smaller one...I take pride in what I do and do not wanna sell a kit where things look shabby when all done. It does not HAVE to look shabby, it just depends on how much work the buyer puts into fitting the MAF.

BTW: The kit includes the Converter Box, wires & connectors, and instructions. The MAF is for the buyer to find.

tim_s · « **Reply #38 on:** June 27, 2006, 03:48:32 AM »

Although I'm megasquirted so its not for me really, i'm still really intrigued at this! have you 'mapped' the new setup with your wideband etc? be cool to see a really straightforward conversion like this, i think its a great idea!

btw once you're ready, if you'd like me to see if anyone in the UK is interested, let me know, as I reckon there'd be quite a bit of interest. would have to be a complete product with the MAF etc though i reckon as the MAF you've picked is probably difficult to find over here.

nickmpower · « **Reply #39 on:** June 27, 2006, 10:56:44 AM »

yeah is the engine running lean or rich? with what injectors? is there still a "hole" in the powerband?

bmwman91 · « **Reply #40 on:** June 29, 2006, 10:40:53 AM »

There is NO mapping necessary on the user end. It is NOT tunable, it is just 'plug it in and drive.' Aside from the cost of a Split Second converter, the other big turnoff to MOST people (and a smart product developer will make stuff for MOST people) is that you have to tune it yourself...and there is risk involded in that, as well as even more cost if you want to tune for any additional power (dyno time).

The hole in the powerband...
Well, it is there with my AFM on the car as well, just less pronounced. Take a look at the attached Excel file. There is a nice big dip in the torque curve from 3900 - 4300RPM, causing a reduction in the RATE of increase of power. If I could get a like 12th or 16th order polynomial best-fit line on there, and take its derivitive, I could see just how much less the power curve's slope is than everywhere else on the plot. Also, it may not be the lowest slope on the power curve, but one can feel the effec in a more pronounced fashion as the low-slope part sits right between two of the steepest parts of the power curve. It is like putting your hand into 35C water...after having it sit in some 3C water...the warm water will FEEL a LOT hotter than it actually is. Anyway, the chart i added on the end is zoomed in to the dip. Let's hear some of you guys' analysis of this.

(Dyno...from my first 318IS, running AFM/JC Chip/some exhaust stuff/pointless intake)

Deutschbag · « **Reply #41 on:** August 16, 2006, 04:27:15 PM »

Bump to the top because I've almost stalled my car twice this week because of the retarded flapper door AFM.

bmwman91 · « **Reply #42 on:** August 16, 2006, 04:32:39 PM »

Lol I will sell you my spare AFM? A redesign is gonna be getting done on the current converter & a new (better fitting) sensor used, but that will be a couple months since my real job is kicking my ass.

Deutschbag · « **Reply #43 on:** August 17, 2006, 02:18:19 PM »

Haha no I don't need a new one, I just need to not give it so much gas off idle. Most other times it runs OK, but I do have some sort of vacuum leak. What I really need is a new lower front bumper (where the fogs/brake vents go), if you have any of those laying around, I'll buy it off ya.

Euro Nation · « **Reply #44 on:** August 23, 2006, 02:20:43 AM »

HAHA... Deutschbag... I tried to get that name on VWVortex but the admins vetoed it and refused to activate the account. I needed a smartass screen name and that's how I ended up with "EuroNation", a joke 98% of the people never understand... and it eventually became my business name.