well the stock MAF housing measures 2.75 inches across. the stock throttle body is 3 inches exactly. even with a bigger bored out throttle body, you cant get enough air into the motor. today i decided to install a new MAF housing ( i went to the american performance shop and asked for a 5 liter mustang MAF housing, he said he had one in back but then he said it was off a 350, it doesnt matter which one, i am just not sure 100%, i will know tomorrow). i actually took the stock box and cut it out a 3.5 inch circle for the new maf housing. i got 3" inside diameter hose and tube to run up to the TB. i got it all installed and of course, it was idleing like crap. i added a bunch of fuel to compensate for the maf reading being low and got it to idle perfectly. now i need to scale the maf on the utec or wait until wed when my map sensor will be in and i can tune my NA car to speed density mode.


part two. i added my cut lower plenum. the car ran perfectly. i have an acelerometer and drove around before hand to see how many forward Gs my car would pull in 2nd gear at certain rpms. i then put in the lower plenum and the car amazingly lost NO low end (under 4500) it pulled JUST as hard. from 4500 to 5500 the car got really really rich 10.9 to 1. after 5500 the car got back to 12 to 1 and pulled like CRAZY harder and harder until redline. i didnt have time to tune it cause i wanted to get the maf housing in. i might grab the maf housing off and tune the lower plenum tomorrow. not sure yet


i am supposed to go to the dyno on friday. i am going to see what i can do with my maf sensor tomorrow and if i cant get it working right i will install my old setup back for the dyno on friday.

i really really have a good feeling about the lower plenum, and once the MAF sensor is figured out, there will be more air flowing in for sure...

i will post some pics tomorrow, i am just tired....

 

Wow-congrats on getting this thing up and running well with that housing. Looking forward to the pics...

 

subscribing...tomorrow

 

Nice job bud.

Looking forward to the results. I had a clue you were doing this, just did not know it was this far ahead. Thats why i started the other thread lol and 4 hours later you post this up

cool cool

Later
Aceman

 

I'm interested in the results of that lower plenum tune.

 

some pics....

 

more pics...

 

Looking good.

So you still doing a before and after dyno with the lower manifold?

Later
Aceman

 

couple more, i will post up more tomorrow.....


finished product and i will be tuning all day to see what i can do

 

it sucks, the dyno i like to use is always really busy, i wont have time to dyno before and install it the same day and redyno. i wish i could but it would take a few hours to do.


i know i am right around 260 before hand. i will see what happens friday and see if i can schedule some more time where i can have a couple hours in between runs somehow...

 

Thats some nice country side in those pics, nice cars too
Reminds me of my area, forgot the mountain range goes the whole down into florida.

Well if you cant do both before and after pulls i guess it will be alright It just would be nice to see the overlay of the two.

Later
Aceman

 

oh believe me. i want to do it the same day on the same dyno. we took those pics at z dayz last weekend.



i will tune the plenum some more tomorrow and see how i like it....

 

nice job... I have the same thing done to my engine too middle of last year... and definitely need to tune it up though...

my MAF housing is integrated with the intake pipe now and its diameter is 84mm... while the bell mouth in the airbox is 118mm in diameter...

cheers,

richie

 

Getting my X pipe custom made tomorrow. I might see what it will cost to make me a custom MAF housing while im at it What the hell

Later
Aceman

 

yeah thanks man, i am just happy to get it idleing perfect in only a few minutes... i think it will be easier to tune in speed density mode so i might wait till wed when i get my map sensor for the utec to set up. the maf signal is so much weaker now that there is not as much room for correction.
my maf housing measures right at about 86.2 mms


cant wait to get everything running right...

 

shouldn't cost hardly anything. the maf electronics just slide right inside of any ol' tube. (with the correct hole size ofcourse, lol)

 

Jeremy-

Looks like I'll be bugging you for something else if this goes well. I'm sure that it will.

Congrats man, you are making Z owners proud with your UTEC "self-tuning" and now fabrication.

 

About damn time Jeremy, congrats!

 

well yes the MAF will slide down in any tube yes. but the maf calculates how much air is flowing into the car. it calculates this through a 2.75 inch tube. when you put it in a larger tube it doesnt pick up as much air cause more can flow around it sooo.... you have to have a computer that you can tune it so it calibrates correctly. im sure you know this. just letting other people know they cant just go out and get a big pipe and throw the maf in and work righ

 

thanks guys. its not that i am cheap at all. i just think that most stuff for the car is way overpriced for what it is. people have been doing stuff like i am doing to engines for years. it just seems like everyone on here will only do stuff that is the norm and only a few people look outside the box....


off to go tune some more!!!!