maf location for forced induction?????

[bowtiy]

just curious if the maf should be installed on the filter side, or the pressure side of the system???? my mustang has the mass air meter between intercooler and the throttle body, on my cousins grand national has the mass air meter near the filter on the inlet of the turbo??? which way is correct??? was wondering if this may be why his a/f ratio is so out of whack///
bowtiy

[ntrcptr90]

U want your MAF sensor to be a Blowthrough configuration. Much more accurate. You might have to "clock" it when trying to get a good signal and also make sure you have at least 6-9" or straight pipe before it to straighten out the airflow, it helped out a ton on mine doing it. Don't know on the GN but i could have sworn those were speed density cars, maybe marty can pipe up he was/is the gn expert.

[bowtiy]

U want your MAF sensor to be a Blowthrough configuration. Much more accurate. You might have to "clock" it when trying to get a good signal and also make sure you have at least 6-9" or straight pipe before it to straighten out the airflow, it helped out a ton on mine doing it. Don't know on the GN but i could have sworn those were speed density cars, maybe marty can pipe up he was/is the gn expert.
it may be a speed density car but they installed a maf off of an LS1 on the car.. not sure why????

[SRT Brian]

On the Grand National's its a speed Des. type. When doing upgrades we all use the LS1 MAF and then you have to buy the MAF Traslater to go with it, for the computer to know it. I did the same thing to mine. Whats all done to the car? has he played with the computer chip at all? Have him look up TurboTweak Home (http://www.turbotweak.com) This guy knows how to tune these cars.

[bowtiy]

On the Grand National's its a speed Des. type. When doing upgrades we all use the LS1 MAF and then you have to buy the MAF Traslater to go with it, for the computer to know it. I did the same thing to mine. Whats all done to the car? has he played with the computer chip at all? Have him look up TurboTweak Home (http://www.turbotweak.com) This guy knows how to tune these cars.
sposed to have an upgraded turbo, comp cam, injectors,,,,. i dont know anymore than that besides the a/f ratio was way out of wack and was blowing tons of black smoke during the runs on the dyno... i think he's gonna have PTR injection install a stinger4 engine management system on the car..

[SRT Brian]

Nice! Well the fuel pumps are the cars are weak when you start putting stuff on, Postons has a Walbro its the one that I did, and then you get there hot wire kit and it runs all new wire from the engine to the tank, and then get a adjustable fuel presh reg. I hope he did somthing with the chip or that will make the Air/Fuel be all over the place

[bowtiy]

so whats the most common way to run the maf on a grand national?? blow through or pre turbo??

[SRT Brian]

Is it a 86-87? Intercooled?

[SRT Brian]

Mine is right before the turbo. I think they should be a blow tho type but mine isent.

[il_wolf_li]

Before or after the turbo... Depends on the MAF. They are either calibrated for draw-through or blow-through, so a draw-through won't like being blown through and vice versa... Make sure the parts are meant to work with each other. Including the computer system, a speed density car has a set parameter and has no way (that I know of) to compensate when ur throwing more boost at it then it was programmed for. U could always setup an extra injector in the intake on a window switch that would activate it at a certain boost level or rpm. I don't know much about these LS1 MAF swaps so no help on that part. Can u explain it or post a link?

[sr240]

mafs go in the intake before the the turbo... right after the air filter....on dsms thats how they are set up but i know the gm sensore are a inline thingy that goes right b4 throttle body

[Ryfly05]

With a supercharger it might be different, but my cars maf is in the throttle body, obviously before the blower, no boost seen. Also you should have a honeycomb looking screen that goes before the sensor to straighten the airflow for accurate readings.

That said, a lot GTP guys that go turbo run blow-through on the stock maf with no problems, other than maxing it out lol.

[talntid]

On my Talon, my GM 3in MAF (from LS1) is setup right before the throttle body. Factory configuration for stock MAF is right after the filter.

[twotons]

Grand Natioanls all run the MASS on the fresh air side of turbo, run the Mustang on the pressure side. With some clocking and making the Mass is the correct size for the injectors is also a key point on tuning a Mustang.

[trbo355]

On the Grand National's its a speed Des. type. When doing upgrades we all use the LS1 MAF and then you have to buy the MAF Traslater to go with it, for the computer to know it. I did the same thing to mine. Whats all done to the car? has he played with the computer chip at all? Have him look up TurboTweak Home (http://www.turbotweak.com) This guy knows how to tune these cars.
The GN's are not speed density and the LS1 MAF is a nice upgrade for more airflow plus the fact the original GN MAF was failure prone and are out of production. The original GN MAF was an analog signal and the translator converts it to digital.
The GN's do have a MAP sensor on the passenger fender but its sole purpose is to run the bar graph boost gauge in the dash and has nothing to do with the computer.

[yay]

The GN's are not speed density and the LS1 MAF is a nice upgrade for more airflow plus the fact the original GN MAF was failure prone and are out of production. The original GN MAF was an analog signal and the translator converts it to digital.
The GN's do have a MAP sensor on the passenger fender but its sole purpose is to run the bar graph boost gauge in the dash and has nothing to do with the computer.

ahhh sorta like the old school 7mgte supras...

[AWD_Launch]

just curious if the maf should be installed on the filter side, or the pressure side of the system???? my mustang has the mass air meter between intercooler and the throttle body, on my cousins grand national has the mass air meter near the filter on the inlet of the turbo??? which way is correct??? was wondering if this may be why his a/f ratio is so out of whack///
bowtiy

Most stock turbo cars have the maf before the turbo but people who usually upgrade their cars chooseto run it in the blow-through set-up because it is the most accurate, can still let the car run if a pipe blows off, and doesn't make the car run rich if there is a boost leak (assuming it is before the maf).

Take DSM's for example, most people hate the stock location so they modify where it goes.

[trbo355]

Most stock turbo cars have the maf before the turbo but people who usually upgrade their cars chooseto run it in the blow-through set-up because it is the most accurate, can still let the car run if a pipe blows off, and doesn't make the car run rich if there is a boost leak (assuming it is before the maf).

Take DSM's for example, most people hate the stock location so they modify where it goes.
Thats a good idea especially with aftermarket front mount intercoolers since there is so much more reverberating air volume. And the blowoff valve going off in decel would drive the motor rich when the MAF sees all the fake airflow in stock position.

[Northwest outlaw]

It been some time i take it you go it if this was for a blow thur you dont need a map the only time you need one is to auto adjust your timeing under boost hope this help if you havent got it.