View Full Version : Bigger MAF - Cheap

04-04-2003, 07:07 PM
O.k. Money is terribly tight, but I just can't stand to start the spring season with a 55mm maf anymore.

What year and vehicles can I hit the salvage yard looking for a bigger MAF? Is it the 70mm that I use? What years and models of cars?


04-04-2003, 07:11 PM
Most have said 92+ in other posts, but my '91 had one too. There's a p/n posted here somewhere too.

04-04-2003, 07:48 PM
Isn't the problem with the OEM MAF that even on the 92 and up cars the 70 mm is actually bridged so it performs the same as the 55 mm ? i think that is what i remember from the FAQ .


04-04-2003, 07:56 PM
doesnt matter if its a SC or LX or a base bird, from 91 up they all had 70mm mafs, except the first 4 months of 91 the cars that rolled off the line had 55mms, the 70mm will start with the part number F1xxxxx, just look for the F1 and rip it off!. From many people who have 55's and went to a newer maf they said right away how much of a difference in thottle response they now have.

04-04-2003, 07:58 PM
Here is a pic of the Ford 70mm vs the C&L 73mm. Ford is on the left and the C&L is on the right. In the pic the ford looks bigger but it's an optical illusion and 3mm is not very much difference anyway.


Now you tell me if the Ford 70mm will flow better than the 55mm unit.

You can find a lot of Ford vehicles with 70mm MAFs. The one shown was from a 94 3.8 Cougar. I even used the electronics that came with the 94 Cougar MAF for over a year. Or you can install your 55mm MAF electronics onto the 70mm Ford unit. Right now I am using the old 55mm electronics on a 76mm C&L. I'll sell the Ford 70mm MAF including electronics for $50 shipped. The electronics numbers are:


04-04-2003, 08:50 PM
Is there any problem with hacking the bridge out of the OEM
70 mm MAF ?

04-04-2003, 09:50 PM
Yes and no. Check out the FAQs on MN12 Performance ... www.mn12performance.com (I think that's where the how to FAQ is??) You also have to drill the air sampling tube, you can't just "cut out the metal pole in the middle"


Robert Kohlman
04-04-2003, 09:54 PM
You can hack the bridge and drill out the sample tube. Go to WWW.Mn12performance.com and look for instructions on this mod.

I have heard of mixed results with that mod. If you are on a budget I think that it is worth a try. I have 73mm C&Ls on both my 90 and 95 SCs. The stock TB is 60mm. I haven't calculated the actual cross section of the stock Ford 70mm with the bridge installed but I have been told that it is closer to 60mm by Ford Mechanics.

The 70mm or 73mm is a really good upgrade on cars with the 55mm MAF. You can definately tell that it helps the revs in the upper RPM range.


04-04-2003, 10:00 PM
Thanks guys. I think I'll go scrounging around the wrecker's tomorrow.

XR7 Dave
04-04-2003, 11:21 PM
It makes a noticable difference. I removed a Ford 70 and installed an old 55. It cost me at least a pound of boost and even my wife can tell the difference.

Robert Kohlman
04-04-2003, 11:30 PM
Thats funny! My wife only notices "New shiny silver thingys under the hood" and says, "That wasn't there before". She also notices that the car sounds different and to both says, "How much? New exhaust?"


04-05-2003, 04:38 PM
Pro-M has come out with a 90mm Lightning MAF knockoff that goes for about $80. Can't beat that.

By guy at Detroit Speedworks get's them directly from Pro-M and I'm pretty sure they calibrate them to your application.


XR7 Dave
04-05-2003, 05:38 PM
I didn't see a price there listed for the part. I looked on other sites and I see a 95mm that goes for about $200 but no 90mm at all????

04-05-2003, 06:55 PM
Thanks guys. I'll have to try and locate the 70mm unit. Certainly 93+ sounds like it would be certain to have it. I was asking with the bridge cut out mod in mind.

I think that if when I go above 70mm for the MAF I'll also want to go with a bigger TB.

04-05-2003, 09:21 PM
I cut the bridge and drilled the maf on my '93 slight but noticable increase in performance gain.

Use care, it's best to chuck it in a vice when cutting. Take your time, use a new blade with fine teeth. (take out the electronic package first, have to use a pair of pliers/vise-grips unless you have a special torx bit). After cutting out the bridge, you can use a file, but I recommend using a Dremel tool and sanding drum or metal cutting bit (BE EXTREMELY CAREFULL) to remove the stumps and smooth out the finish. When drilling out the sampling tube USE A NEW DRILL BIT. I high recommend a drill press. Make sure that it is centered and squared so you get a true cut, Iused a relitively slow speed.

Good luck if you choose this mission.

p.s. If you can't find the mod at the link previously posted email me [email protected] and I'll dig out the procedure for you.

04-06-2003, 02:41 AM
Is the 70mm MAFS only on the 3.8s or is it on the V8s also? I will definately be back at the junk yard to find one of these.

04-11-2003, 12:46 PM
Well, I went to my local junkyard today and they looked it up on their computer. He showed like 3 or 4 different part numbers (not Ford part numbers). One number for 92-93, one number for 94-95, different numbers for SC/non SC, etc...

I need more info please. Is anything different from 92-95 and SC/non SC? Are the electronics all the same, same plug?

Or do I just tell him 92-95, 3.8L Bird or Cougar?

Does $45 sound like a good price?

04-11-2003, 01:20 PM
I can get them for $35 at the local bone yard so $45 may not be that far off.

Ask the bone yard for a MAF for a 93 SC and they can use the computer to cross reference the correct part.


04-11-2003, 03:43 PM
You want to use the electronics from your old MAF, just use the housing from the new one.

04-28-2003, 11:40 AM
I got the 70mm MAFS from a 92 SC and cut the bridge and drilled the sampling tube. Definate difference, not huge, but noticable. I sand blasted the new one at work, now it's the best looking part under my hood.

I used the electronics from my 89 but was wondering what the difference is between the old and new electronics? The new one did start with "F1".

04-28-2003, 12:01 PM
The difference will in the electronics will simply be that they are tuned for the 70mm housing whereas your 55mm electronics are tuned for that flow.

The mod for the 70mm housing works like some aftermarket MAF's out there by changing the tube diameter, and using the 55mm electronics, your fooling the electronics to read accordingly to the new MAF housing.

Ideally the MAF electronics are changed for the new flow rates in the intake stream. But that cost's money and requires a new MAF that is programmable. This little mod is cheap and for most people works out o.k. Though it's benefit is no where as good as a 76mm or better aftermarket MAF that is tuned correctly.

I drilled out my hole yesturday but didn't do a very good job. It's smooth, but wasn't dead center. So I'll have to see how it will perform once I get some metal grinding bits for my Dremel.

04-28-2003, 06:50 PM
I used a 70mm Ford MAF out of a 94 COugar 3.8 V6 LS in my SC for over a year. I recently got a 76mm C&L with gold sample tube and installed it with my original 55mm electronics. I have the MAC intake and on the Dyno my A/F was right at 12 to 1. You can use the 55mm electronics on a Ford 70mm with no problems, my nephew has for about a year.

05-13-2003, 02:44 PM
Ok, so here's my question.

Swapping mafs without a computer tune is a no-no with the late model v8's.

Anyway, my brother has a 89 sc. The maf has been throwing a code, I cleaned it, now I think he needs a new one. Can I swap the stock maf from my 95 v8 LX onto his car without a computer tune?

Also, can I use the 95 electronics on the 89 sc without a computer tune?


j rick kirby
05-13-2003, 03:10 PM
I did the mn12 mods to a 70mm tb and could tell no difference.I already had S model,raised top,xhaust,180 thermo,cool fan switch and an IC fan.But when I put on my Pro-M 77,WOW,a real kick in the seat!