[HOME] ported lt1 maf

[crazygn]

Has any one ever tried this on a buick before, i spent about 2-3 hours on mine but i cant run it yet. I took and ported the hole maf [If you look in my profile there are pictures of it in my webshots]

I did this same thing to my 2000 grand am 3.4 v6. It droped from 15.60's to a crazy 14 96 with just this mod. How do you guys think it will work on the turbo buick, i say the more air flow should help a good bit.

thanks for your time.

 

[UNGN]

Porting a MAF like that doesn't improve the airflow as much as you think (the whole airfoil is less of a restriction than the exposed Plastic piece you left) and it screws up the calibration towards lean. Most of the performance increases LS1 guys see with this mod is from the leaness and not from the additional airflow.

A MAF works buy measuring the "airspeed" of the air thru a given area, known as the "throat".

Mass flow = Rho X Velocity X Area

Rho is the density of the air which is calculated from temperature, pressure and/or guessed by the chip.

By changing the area of the throat, you've changed the value of an assumed constant and the computer can't correctly calculate the mass flow anymore.

Give it a try, but keep an eye on the knock gage as the airflow readings the MAF will generate will be lower the actual airflow passing through the MAF (the larger the area the slower the "airspeed" reading for a given massflow)

 

[Intercooler]

Crazy,

I think the trans has your old TV cable on it. It doesn't look like my 87 I took out of the car. If you can recall and want it let me know and I will send it to you since I have no use for it.....back to your thread!

 

[boostcreep]

I could have sworn that the mafs we use measure air mass and not air speed. But what do I know?? BTW, I heard that someone is working on a dual element 127 mm maf. That's 5" inches folks! Wild! Anyone know who this is? I hope I didn't let any cats out the bag by mentioning this.

Nick

 

[UNGN]

Originally posted by boostcreep
I could have sworn that the mafs we use measure air mass and not air speed.

Nick

They CALCULATE air mass based on air speed, air density and a KNOWN area. Porting the throat of a MAF changes the known area into an UNKNOWN area, throwing the calculations out the window.

It will still work (more airflow will register as more airflow) but the calibration will be way off. The MAF may say its flowing 170 GPS when it is actually flowing 250 gps.

If you are Bruce Plecan and own a Wide Band O2, you can burn a custom chip and you will make it work. If you are like the rest of us, you will have likely have lean out problems unless the car is rich to begin with.

 

[bruce]

If your worried about airflow, then blow thru it instead of trying to suck thru it.
Turbos make better pressure pumps then vacuum pumps.

If you want to remove the screen, and cut the foil out I'd really recommend you have a WB and be ready to redo the MAF tables and scalers.

The best I've found is using a 3.5 MAF in a 3.o housing, blow thru with screen no foil. But, I spent a fair amount of time with the WB making sure it was all correct.

I also have a 3 housing that is a nice paper weight. I tired having it bored out, and it basically quit working. There are some critical air flow speeds to get the sensors to read the MASS correctly.

No foil, blow thru, with screen, and careful tuning with the T+ is my best suggestion.

 

[crazygn]

So i guess i should give it to my buddy that has a ram air trans am.