JerryK,
i believe he swapped his original 19lb injectors for 24lb ones

 

Yes i did change the stock injectors from 19 to 24lbs.
Man....i didn't think the nass air meter that came with the conversion kit was so small.....maybe thats one of my problems.

The right size yhat i should be using is a 75mm? Does it have to be for a truck app. or can i use one from a mustang?

 

Any size meter calibrated properly will work but given the HP you're likely to make w/ the heads/intake/exhaust work you have 73 or 75mm Mass Air Meters are very effective at that HP level. Its not to say a 70 is wrong. MOST of what makes it perform best is the calibration of the curve programmed into the electronics of the meter, the rest of it is the size (amount) of air the meter can flow. Just make sure you have a meter calibrated for your application. By that I mean 24lb meter for 24lb injectos (no mismatch) and Natrually Aspirated or Supercharged if that is the case. Pro-M will usually programs in an air curve that is an extra 5% rich up top for supercharged applications just to keep them safe. The alternative is to get a custom chip which takes care of a lot of that. It makes chip tuning easier though if the meter is very closely matched. Hope that helps.

In my opinion if you have an FMS 70mm and 24lb injectors you should be pretty close. BUT: one last point: the FMS 70mm came on 93' Cobras which did something funny to the fuel or timing curve at WOT. I WISH I remembered, this is going way back.. You may want to post a question over on www.corral.net in the Windsor tech section asking about what was specific/problematic about the 24lb meter on the 93 Cobras.

 

hey dvldog i got a quick question for you. i want to get the fms mass air kit for my truck and i noticed they have 2 different ones, M-9000-T50 and M-9000-T51. the first is made for the m5od tranny, a nd the second is made for the aod tranny. i was going to buy the one for the 5 speed (since thats what i have), but i might consider a C6 swap down the road (WAYY down the road) and i was wondering which kit you are using since i know you have the C6 tranny. thanks!

 

Jerry K,
Thanks for the info......i'm gonna give Pro-flow a call and see what MAS they have for me.I'm definately off with 24lbs injectors and the wimpy MAS they gave me with the conversion kit.
One more question,the instructions on the conversion kit don't tell you what size MAS i have.I called Ford's tech line to get that info....good luck getting someone to answer the phone there...anyway i called Summit racing and they told me it was a 65mm MAS.
Are you sure its a 55mm? I'm just tryin to figure out how off i am with the injectors and the MAS.

Donate,
I'm using the T50 for the manual trans.It works like a charm...keep your eye open on Ebay,i saw one on there a ways back.

Thanks guys.

Jerry D.

 

I'm almost certain the unit is 55mm, its REALLY small. Compare it to a Pro-M 75 and it certainly seems like a 20mm difference. This just helps in terms of max flow. Calibration is another issue. My truck runs GREAT w/ 24lb injectors. Thats because my meter is matched to it. You don't necessarily need to switch to 19lb units but if you go back to 19lb units w/ the meter that came w/ the FMS kit then I'll bet a lot of your troubles go away. Then you could upgrade to a Pro-M 75mm "Bullet" they call it calibrated for 19lb injectors and you'll be set. What is your computer code on the computer they sent you in the kit? Mine is A3M1 I believe. Chris Johnson of www.jmschip.com could burn you a nice 4 way chip for that thing, that's what I did on mine. He could easily burn a chip to work w/ the 70mm FMS MAM as well.. lots of things to try eh?

 

NOW we're talkin!
I'll check it out later and get back to.....what would i do without you guys.
How much would a chip cost,just off the top of your head?I really don't want to go back to 19 lbser's.....bigger is better.

Thanks,
Jerry D.

 

i have a 96 4x2 and it has mass air my 89 does not have it and the 94 i was looking at does not have it what was the frist year the 302 have it in the f-150???

 

i think mass air started in 96, but ive heard some got it as early as 95. before that, they came with speed density from the factory.

 

Chip is about $310 from JMS. 19lb injectors are fine for a naturally aspirated 302. If your gonna but a blower on it then 24lb injectors are a good starting point. I have 24lb injectors only because I had an extra set laying around from my old mustang combo.

I "heard" some trucks were mass-air before 95.. it may have been a california thing OR an Auto Tranny thing..

 

Jerry K

So you think i should switch back to 19lbs injectores or should get a calibrated MAM and a chip?

I just don't want to go backwards with my performance.

 

is it hard to make a 4x2 in to a 4x4???? can i just change the I beams in the front or is there more???? and will the tansfer case go on a 2 wheel tranny????

 

My 95 came with Mass Air, a friend of mine who had a 95 had speed density. We both have 302s/ AOD go figure. Same truck same assembly line. His was built 2 months before mine. His also came with a tach from the factory and mine did not. Both are XLTs, with all the same options. He sold it unfortunately. BTW stock vs. stock, I was faster!!

 

i have and a few other 302 and beat then but the best race was a 2000 road goat 318 5-speed 4x4 SB he had me till about 40 mph and then i went by him like he was standing still.

 

Options:

1. 19lb injectors and the meter that came w/ the FMS conversion kit

2. 19lb injectors and a Pro-M 75mm Bullet for 19lb injectors and a naturally aspirated engine

3. 24lb injectors and a Pro-M 75mm Bullet for 24lb injectors and a naturally aspirated engine

I don't think you'll notice ANY difference between #2 and #3 and in fact I have #3 but its only because the parts were cheap in my case.


Jerry