The Top DSM Community on the Web

For 1990-1999 Mitsubishi Eclipse, Eagle Talon, Plymouth Laser, and Galant VR-4 Owners. Log in to remove most ads.

Please Support Morrison Fabrications
Please Support Fuel Injector Clinic

1G what exactly maf do?

This site may earn a commission from merchant
affiliate links, including eBay, Amazon, and others.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

benyps

Probationary Member
5
0
Aug 25, 2016
new york, New_Hampshire
hi all
first of all sorry for my english!

i have 1g galant gti
i wanted to know what exactly maf does?
and what efects does it have on spark timing?
because im gonna run fuel only adjustable ecu and i wanted to delete the maf.
i want to know when i delet the maf what will happen to ignition advance timing?
thanks all for helping
 
maf meters air, tells ecu how much fuel it needs to spray into the engine, so you cannot just delete it.

what is "fuel only adjustable ecu" ?
 
so your switching from MAF to MAP (speed density) ? I would think that with any tunable ECU, you will have a base tune with stock fuel and ignition tables.
 
so your switching from MAF to MAP (speed density) ? I would think that with any tunable ECU, you will have a base tune with stock fuel and ignition tables.
so you are saying the maf does not anything with the spark ignition timing?
im going to use 2 ecu.one adjustble for fuel control. and the other one (the stock oem mitsubishi ecu) for controling spark ignition.
if maf just control the fuel i can delet it and use map sensor.but if it calculate ignition timing too,i cant delete it.
thanks all
 
oh so your talking about a piggyback ecu. your gonna need the MAF then. i thought you were gonna run something like a AEM or MS or ECMlink that has the option of running speed density.

what piggyback ECU are you gonna be using?
 
I am thoroughly confused. If you are going to use a map sensor and delete the maf, I am not currently aware of any piggy back controller that is going to allow you control fuel. The stock ECU that you want to use is still going to be looking for a MAF signal.
 
so your switching from MAF to MAP (speed density) ? I would think that with any tunable ECU, you will have a base tune with stock fuel and ignition tables.
no its not piggy back.
im using an ecu exactly like megasquirt.
but i dont want to control ignition.i just want to control fuel.
read this:this is from mega squirt web

Fuel Only Installation
Skip the Spark output section below as well as the ignition and dwell settings. You should be able to share the CMP and CKP CAS signals with the stock ECU to get your TACH signal to trigger the MegaSquirt so you can take control of the fuel injection on your 4G63 and leave ignition control to the stock ECU for now. This is a great way to ‘get your feet wet’. Learn the basics of installing and tuning the MegaSquirt EMS system, and then when you’re ready it will be pretty easy to add in ignition control as well by following the Spark Output section below. For fuel only control though you just need to wire up the rest of the sensors (IAT, CLT, O2, TPS) and make sure you are getting good readings from them and a good TACH signal on the MegaSquirt. At this point you’ve still taken control of nothing, you’ve just hooked all of the MegaSquirt INPUTS. Now comes the fun parts… wire up the injectors! If you use new injector connectors and new wiring from the MegaSquirt it will be easy to swap from factory ECU control of the injectors to MegaSquirt control and back if you need to while you work out your tuning.

https://www.diyautotune.com/support/tech/install/dsm/megasquirt-your-4g63/


now i want to know what will happen to ignition spark timing when i delete maf?
i disconected the maf conector and i didnt notice a big change!

thanks
 

Attachments

  • 1990l-page-003.jpg
    1990l-page-003.jpg
    213.3 KB · Views: 50
  • 1990l-page-004.jpg
    1990l-page-004.jpg
    286.7 KB · Views: 151
  • 1990l-page-004.jpg
    1990l-page-004.jpg
    286.7 KB · Views: 71
  • 1990l-page-003.jpg
    1990l-page-003.jpg
    213.3 KB · Views: 67
  • 1990l-page-003.jpg
    1990l-page-003.jpg
    213.3 KB · Views: 64
You must be logged in to view this image or video.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

You must be logged in to view this image or video.


1990 dsm tech manua!

wow thanks a lot for these docs...
it said that the barometric sesnor inside it correct the ignition too.
so it does something with ignition!
now i have a silly qestion!!
i want to instal intake air kit and delet the maf.
it said the barometric corrects the ignition and its messering altitute not the air flow!
so i think it doesnt need the flow to the engine for messering the altitude.
can you give me the pin that barometric give the voltaje to ecu on the sensor conector?i didnt figure out

so what if i leave the maf conected to the ecu but cut the intake pipe and add another intake pipe and air filter as this picture:
You must be logged in to view this image or video.
 
That does not appear to be a turbo car.

The maf measures how much air is entering the turbo system, which is how much air is entering the engine in a leak free setup. You do not want two MAFs, or two sources of air especially if one is unmeasured.

The ECU or whatever the resulting hackjob is needs to measure air, and send enough fuel to match, as well as ignite it at the right time (timing). Whether airflow is measured by a MAF, SD, or a goat with electrodes attached to its brain cells, something needs to report the amount of air to the ECU period.

It sounds like you want to delete the MAF to install a shiny pipe. I would reconsider your options. Ot try it, then start a thread about why your car will no longer start.
 
Last edited:
I am thoroughly confused. If you are going to use a map sensor and delete the maf, I am not currently aware of any piggy back controller that is going to allow you control fuel. The stock ECU that you want to use is still going to be looking for a MAF signal.

Just as an fyi. Piggybacks like a Greddy Emanage Ultimate can do a speed density conversion just like an EMS can but by doing a simulated maf map (like ecuflash does). It's just ridiculous to spend that amount for a piggyback when we have ecmlink and ecuflash available.
 
Just as an fyi. Piggybacks like a Greddy Emanage Ultimate can do a speed density conversion just like an EMS can but by doing a simulated maf map (like ecuflash does). It's just ridiculous to spend that amount for a piggyback when we have ecmlink and ecuflash available.

Dsmlink, tunerpro, swededensity and jackal/werewolf is 1g...all inexpensive and based on 1g ecu platform.
 
Dsmlink, tunerpro, swededensity and jackal/werewolf is 1g...all inexpensive and based on 1g ecu platform.
i know...but i wanna run somthing like megasquirt.
thats what i have now and really dont have money for anything else.
if anyone know my answers please answer my last post in this thread.
thank all for comenting.
 
You're not going to really see any measurable gains by deleting your MAF.

And like already mentioned, your car is not turbo charged so spending all that time/money on a piggy back system for an NA platform isn't really going to pay off.

I feel like you're over complicating the setup.
 
i know...but i wanna run somthing like megasquirt.
thats what i have now and really dont have money for anything else.
if anyone know my answers please answer my last post in this thread.
thank all for comenting.
You still cannot delete your maf while installing those four MS sensors. The ECU is still looking for all those signals that come from the maf plug. The MS is just acting as a piggyback in that config by just adding or subtracting fuel, with some feedback off those added sensors.
 
Support Vendors who Support the DSM Community
Boosted Fabrication ECM Tuning ExtremePSI Fuel Injector Clinic Innovation Products Jacks Transmissions JNZ Tuning Kiggly Racing Morrison Fabrications MyMitsubishiStore.com RixRacing RockAuto RTM Racing STM Tuned

Latest posts

Build Thread Updates

Vendor Updates

Latest Classifieds

Back
Top