PRO-M Mass Air flow on a 3.2, Does anybody have any experiece with one Options

[Steve]

I installed the PRO-M Mass Air flow on my 3.2 in my 914.
The motor idled fine but mid range and high ran rough and cut out.
I tweaked the knobs on the tuner module and it no longer cut out.
I did not notice any more power and the motor ran kind of boggy.
Does anyone have any experience with this conversion?

regards,

SF

[Steve]

Here's a picture of the tuner.

SF

[Brad Roberts]

Steve,

I tried a few different items on the 3.2 back several years ago (including a hot wire conversion) the general concensus in the industry was: none of them really do anything worth while. The thought was: the flapper box restricted flow.. until somebody ran the numbers and realized that wasnt the problem.

It looks good.. I'll give it that.

B

[boxstr]

Steve I would head over to bird board 1, and see if any of the 911 gurus over there can give of there devine wisdom.
I saw one of those on ebay, you weren't the high bidder were you? I think I will get the stock motor into the car before I start throwing all kinds of "magic hp" at the thing.
One thing everybody keeps mentioning is a Steve Wong chip.
Keep us posted on the prognosis.
CCLIN3.2ENVY

[SirAndy]

sorry for hi-jacking this thread (somewhat) but does anyone know where i can find a air-flow sensor with good documentation? i need to know which volt-output matches what FM.

does anyone know the numbers for the 1.8L sensor?
what about the MAP sensor the MegaSquirt is using?

anyone?
Andy

[sechszylinder]

hi andy,

here's some documentation about converting an older motronic to work with a mass flow sensor.
basically that guy is using some kind of a look up table to correct the voltage levels.

http://www.kolliman.de/e30m3/e30m3.html (danger, german content (IMG:style_emoticons/default/smilie_flagge6.gif) (IMG:style_emoticons/default/wink.gif) )

The MAP sensor of the megasquirt efi will not work with a system, which is designed for sensing air mass
or air flow , like L-Jetronic or Motronic because megasquirt is based on manifold pressure
(Manifold Absolute Pressure) .

benno

[SirAndy]

The MAP sensor of the megasquirt efi will not work with a system, which is designed for sensing air mass
or air flow , like L-Jetronic or Motronic because megasquirt is based on manifold pressure
(Manifold Absolute Pressure) .

danke für den link!

hmmm, i was under the impression that you can translate manifold pressure into air-flow ...

from their web-site:
"The MAP sensor is used by MegaSquirt for two separate tasks. First, it is used as a Manifold Absolute Pressure monitor, which monitors the intake tract pressure (absolute), which is a direct (proportional) indication of mass air flow and required fuel."


Andy

[Mueller]

Andy, the MAP is similar to the TPS, it's basicly a Potentiometric sensor....

which is a direct (proportional) indication of mass air flow and required fuel

you need the lookup table, depending on the table, 3v output from the MAP will be different engine to engine (table to table)

[SirAndy]

you need the lookup table

that sucks. so, with the MAP sensor, you have to compile a new lookup table yourself every time you change something?
why not install a real air flow sensor in addition to the pressure sensor? (IMG:style_emoticons/default/confused24.gif)

Andy

[ss6]

Brad, I thought the big hoo-ya for the hot wire airflow sensors was that they eliminate the slight throttle lag that you get while the engine is trying to suck the MAF flapper open a little more. The newer P-cars use them over the flappers, don't they?

BTW, I think Steve's problem is that he is using *white* drain pipe - everyone knows Porsche uses black drain pipe (IMG:style_emoticons/default/cool_shades.gif)

[Mueller]

I thought the big hoo-ya for the hot wire airflow sensors was that they eliminate the slight throttle lag that you

I think the real reason was/is cost, the hot-wire has less parts and should cost much less than the flapper door assembly.

Andy,

034 EFI

check out this site.....very similar in concept to KitCarlsons EFI as well as Megasquirt.......I've been following his products since the first I first saw it and it's pretty interesting that his EFI has matured at the same pace/time as the Megasquirt (IMG:style_emoticons/default/smile.gif)

He says it is not based on Megasquirt, but I have not dug into it too much...even if it is, he is still doing a great job with the Software, instructions and all the other headaches that go along with taking something to market.

Not sure if you saw this table or not......

A Comparison of Fuel management Schemes.

[Steve]

Brad, I thought the big hoo-ya for the hot wire airflow sensors was that they eliminate the slight throttle lag that you get while the engine is trying to suck the MAF flapper open a little more. The newer P-cars use them over the flappers, don't they?

BTW, I think Steve's problem is that he is using *white* drain pipe - everyone knows Porsche uses black drain pipe (IMG:style_emoticons/default/cool_shades.gif)

I need to stop shopping at Home Depot for my conversion projects.
All they have is white sewer and drain pipes.

Steve