M42club.com - Home of the BMW E30/E36 318i/iS
FAQ / REFERENCE => How-To's => Topic started by: TWM-M42 on July 22, 2009, 02:52:34 AM
-
how do you do it?
-
well are you looking to get rid of the stock VAF (vain air flow meter) and get a actual MAF to increase flow. or get rid of it all together ? and run a MAP and go with a Speed density setup ?
-
Yup, run a Megasquirt and a pressure sensor. Delete the VAF entirely. You should pick up a few throttle bodies...maybe off a bike with 38-42mm throttle bodies too, with some low-impedance injectors.
-
how much would it cost to get rid of the stock MAF and I just bought those mustang 4 way fuel injectors. Do I just install them with no other mods.
-
Hey how do u get rid of the vaf and get a maf that's what I want to do I been looking all over the internet do u guys have any ideas
-
yes that is what i want to do as well but i cant seem to find the answer any where. i will be watching this thread if any one out there can help????
-
Mod delete post
-
Why do you want to get rid of the afm, and don't give me the "It,s too restrictive" excuse because it's not, Metric Mechanic makes engines that produce over 180 hp on the stock afm. As far as the four pintle injectors, just install them and the ecu will adjust over a period of time.
-
First of all it just looks ugly I don't like it 2 I wanna get a nice cold air then 3 some say its air restric and some don't but if it dosnt make a dif I woulnt. Mind I just don't like that big square box in the bay if there's a cheap way of geting rid of it and getting a maf I woul be thankful to know thank you
-
If you call cheap $500 then yeah you can get rid of it cheap, Oh and don't forget the dyno time and tuning to get the car to run right after you remove it for no extra power gain.
-
if you wanna delete it change engine! M44 don't have it so big! eventually you can put away all the electronic management and put on 4 motorcycle carbs
-
if you wanna delete it change engine! M44 don't have it so big! eventually you can put away all the electronic management and put on 4 motorcycle carbs
It will still require a standalone ecu to control ignition
-
no , you can leave the stock ignition working while the carbs control injection (i think it work)
you only have to disconnect the injectors and put on the carbs
-
Well if is not restrictive ill just find a way to relocate the vaf what do u guys think could it work
-
It would probably look hacked up if you moved it. Its not worth it; it looks just fine if your engine bay is cleaned up.
-
I have an 84 633CSi. I will start it and the engine would turn over, but when I let go of the key the car would die. I checked the fuel system was working fine, I put in a new alternator, also tried a used 85 mass air flow meter off an E28, but still the same thing. Any suggestion would be appreciated.
-
Check the ground strap between the block and the body.
-
Sure- get a Weber 32/36. All your MAF will belong to us.
-
We are talking about deleting parts from a modern, fuel efficient, high performance engine management system because you don't like how it looks.
go buy a Civic.
-
I have converted to a MAF & dyno tested it with that and the stock AFM. It makes no difference in power. The flapper door in the stock meter is not restrictive. The biggest pressure drop you are going to see across the meter is like 0.073psi. You lose a lot more than that in the intake ports & intake manifold. Trust me, while there are some benefits to running a MAF, power isn't one of them. The M42's stock air meter is properly sized. M20 motors benefit from larger sensors only because their stock one was too small to start with. They get the same gain from an M30 VAM as they do from a MAF.
The simplest air-fuel control system, and hardest one to tune for a street car, is Alpha-N. It runs from RPM and throttle position alone. It is intended for race cars where you spend 99% of the time at 0% & 100% throttle.
A lot of people have run stand-alone engine management (removed the stock ECU & put a DIY / tunable system). This lets you run almost anything (Alpha-N, VAM, MAF, MAP). However, you will spend a minimum of $2000 on the hardware & dyno time required to get the air/fuel ratio & ignition timing dialed in. You can do most of the AFR stuff yourself, but the ignition timing really does require a dyno.
I understand why you want to delete the sensor. However, it sounds like you are on a budget. If that is the case, forget it. Learn to work with microcontrollers & analog instrumentation & you can do it yourself while keeping the stock ECU. Due to the cost & apparent silliness of the few commercially available MAF conversions out there, I decided that figuring out my own system was a better option. It took a solid 3 years to really get it where I wanted it. Then again, I spent more on electronic development & test equipment than a MAF kit would have cost, so I guess you are damned if you do & damned if you don't :p. That's how just about everything with cars is anyway, though.
Stick with stock & just get a Conforti or MarkD chip. Toss in an M20 flywheel. That's about all you can do for the M42 without spending more than $1000.
-
A lot of people have run stand-alone engine management (removed the stock ECU & put a DIY / tunable system). This lets you run almost anything (Alpha-N, VAM, MAF, MAP). However, you will spend a minimum of $2000 on the hardware & dyno time required to get the air/fuel ratio & ignition timing dialed in. You can do most of the AFR stuff yourself, but the ignition timing really does require a dyno.
Buy the Miller W.A.R. chip and you'll have more money for dyno time. :)
Stick with stock & just get a Conforti or MarkD chip. Toss in an M20 flywheel. That's about all you can do for the M42 without spending more than $1000.
And get rid of excess weight - either yours or the cars or both! LOL :D
-
has anyone tried replacing their AFM (93) with a MAF (95 and up)
if so did it work? did you have to have the ECU reflashed???
thanks for the input:)
-
I'm going to say that the 92-95 AFM's are all the same:) Up to 12/95 you can put a chip in the DME/ECU. Beyond that you're dealing with OBDII and you'd have to have your computer flashed. Unless you're running a different management system it probably won't work, and why would you want to? There is no benefit in doing so.
~Ralph
-
smaller unit in that year tho
-
smaller unit in that year tho
U are referring to the MAF in the M44 which is OBD2....
There are a lot of discussion on ditching the 'barndoor' AFM and go the MAF route... but the consensus seem to be that it doesn't give you extra horses... but u do get smoother power delivery... Conclusion: not worth the trouble...
If u really want to go that route, just go all the way and put in a standalone ECU.. u can tune the engine anytime u want.... ;)